Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1 | /* |
| 2 | * ring buffer based function tracer |
| 3 | * |
| 4 | * Copyright (C) 2007-2008 Steven Rostedt <srostedt@redhat.com> |
| 5 | * Copyright (C) 2008 Ingo Molnar <mingo@redhat.com> |
| 6 | * |
| 7 | * Originally taken from the RT patch by: |
| 8 | * Arnaldo Carvalho de Melo <acme@redhat.com> |
| 9 | * |
| 10 | * Based on code from the latency_tracer, that is: |
| 11 | * Copyright (C) 2004-2006 Ingo Molnar |
| 12 | * Copyright (C) 2004 William Lee Irwin III |
| 13 | */ |
| 14 | #include <linux/utsrelease.h> |
| 15 | #include <linux/kallsyms.h> |
| 16 | #include <linux/seq_file.h> |
Steven Rostedt | 3f5a54e | 2008-07-30 22:36:46 -0400 | [diff] [blame] | 17 | #include <linux/notifier.h> |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 18 | #include <linux/debugfs.h> |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 19 | #include <linux/pagemap.h> |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 20 | #include <linux/hardirq.h> |
| 21 | #include <linux/linkage.h> |
| 22 | #include <linux/uaccess.h> |
| 23 | #include <linux/ftrace.h> |
| 24 | #include <linux/module.h> |
| 25 | #include <linux/percpu.h> |
Steven Rostedt | 3f5a54e | 2008-07-30 22:36:46 -0400 | [diff] [blame] | 26 | #include <linux/kdebug.h> |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 27 | #include <linux/ctype.h> |
| 28 | #include <linux/init.h> |
Soeren Sandmann Pedersen | 2a2cc8f | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 29 | #include <linux/poll.h> |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 30 | #include <linux/gfp.h> |
| 31 | #include <linux/fs.h> |
Abhishek Sagar | 76094a2 | 2008-05-28 00:03:18 +0530 | [diff] [blame] | 32 | #include <linux/kprobes.h> |
Steven Rostedt | 3eefae9 | 2008-05-12 21:21:04 +0200 | [diff] [blame] | 33 | #include <linux/writeback.h> |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 34 | |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 35 | #include <linux/stacktrace.h> |
| 36 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 37 | #include "trace.h" |
| 38 | |
| 39 | unsigned long __read_mostly tracing_max_latency = (cycle_t)ULONG_MAX; |
| 40 | unsigned long __read_mostly tracing_thresh; |
| 41 | |
Steven Rostedt | ab46428 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 42 | static unsigned long __read_mostly tracing_nr_buffers; |
| 43 | static cpumask_t __read_mostly tracing_buffer_mask; |
| 44 | |
| 45 | #define for_each_tracing_cpu(cpu) \ |
| 46 | for_each_cpu_mask(cpu, tracing_buffer_mask) |
| 47 | |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 48 | static int trace_alloc_page(void); |
| 49 | static int trace_free_page(void); |
| 50 | |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 51 | static int tracing_disabled = 1; |
| 52 | |
Steven Rostedt | 3eefae9 | 2008-05-12 21:21:04 +0200 | [diff] [blame] | 53 | static unsigned long tracing_pages_allocated; |
| 54 | |
Thomas Gleixner | 72829bc | 2008-05-23 21:37:28 +0200 | [diff] [blame] | 55 | long |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 56 | ns2usecs(cycle_t nsec) |
| 57 | { |
| 58 | nsec += 500; |
| 59 | do_div(nsec, 1000); |
| 60 | return nsec; |
| 61 | } |
| 62 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 63 | cycle_t ftrace_now(int cpu) |
Ingo Molnar | 750ed1a | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 64 | { |
Ingo Molnar | 0fd9e0d | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 65 | return cpu_clock(cpu); |
Ingo Molnar | 750ed1a | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 66 | } |
| 67 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 68 | /* |
| 69 | * The global_trace is the descriptor that holds the tracing |
| 70 | * buffers for the live tracing. For each CPU, it contains |
| 71 | * a link list of pages that will store trace entries. The |
| 72 | * page descriptor of the pages in the memory is used to hold |
| 73 | * the link list by linking the lru item in the page descriptor |
| 74 | * to each of the pages in the buffer per CPU. |
| 75 | * |
| 76 | * For each active CPU there is a data field that holds the |
| 77 | * pages for the buffer for that CPU. Each CPU has the same number |
| 78 | * of pages allocated for its buffer. |
| 79 | */ |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 80 | static struct trace_array global_trace; |
| 81 | |
| 82 | static DEFINE_PER_CPU(struct trace_array_cpu, global_trace_cpu); |
| 83 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 84 | /* |
| 85 | * The max_tr is used to snapshot the global_trace when a maximum |
| 86 | * latency is reached. Some tracers will use this to store a maximum |
| 87 | * trace while it continues examining live traces. |
| 88 | * |
| 89 | * The buffers for the max_tr are set up the same as the global_trace. |
| 90 | * When a snapshot is taken, the link list of the max_tr is swapped |
| 91 | * with the link list of the global_trace and the buffers are reset for |
| 92 | * the global_trace so the tracing can continue. |
| 93 | */ |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 94 | static struct trace_array max_tr; |
| 95 | |
| 96 | static DEFINE_PER_CPU(struct trace_array_cpu, max_data); |
| 97 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 98 | /* tracer_enabled is used to toggle activation of a tracer */ |
Steven Rostedt | 26994ea | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 99 | static int tracer_enabled = 1; |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 100 | |
Steven Rostedt | 60bc080 | 2008-07-10 20:58:16 -0400 | [diff] [blame] | 101 | /* function tracing enabled */ |
| 102 | int ftrace_function_enabled; |
| 103 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 104 | /* |
| 105 | * trace_nr_entries is the number of entries that is allocated |
| 106 | * for a buffer. Note, the number of entries is always rounded |
| 107 | * to ENTRIES_PER_PAGE. |
Steven Rostedt | 3f5a54e | 2008-07-30 22:36:46 -0400 | [diff] [blame] | 108 | * |
| 109 | * This number is purposely set to a low number of 16384. |
| 110 | * If the dump on oops happens, it will be much appreciated |
| 111 | * to not have to wait for all that output. Anyway this can be |
| 112 | * boot time and run time configurable. |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 113 | */ |
Steven Rostedt | 3f5a54e | 2008-07-30 22:36:46 -0400 | [diff] [blame] | 114 | #define TRACE_ENTRIES_DEFAULT 16384UL |
| 115 | |
| 116 | static unsigned long trace_nr_entries = TRACE_ENTRIES_DEFAULT; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 117 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 118 | /* trace_types holds a link list of available tracers. */ |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 119 | static struct tracer *trace_types __read_mostly; |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 120 | |
| 121 | /* current_trace points to the tracer that is currently active */ |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 122 | static struct tracer *current_trace __read_mostly; |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 123 | |
| 124 | /* |
| 125 | * max_tracer_type_len is used to simplify the allocating of |
| 126 | * buffers to read userspace tracer names. We keep track of |
| 127 | * the longest tracer name registered. |
| 128 | */ |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 129 | static int max_tracer_type_len; |
| 130 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 131 | /* |
| 132 | * trace_types_lock is used to protect the trace_types list. |
| 133 | * This lock is also used to keep user access serialized. |
| 134 | * Accesses from userspace will grab this lock while userspace |
| 135 | * activities happen inside the kernel. |
| 136 | */ |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 137 | static DEFINE_MUTEX(trace_types_lock); |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 138 | |
| 139 | /* trace_wait is a waitqueue for tasks blocked on trace_poll */ |
Ingo Molnar | 4e65551 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 140 | static DECLARE_WAIT_QUEUE_HEAD(trace_wait); |
| 141 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 142 | /* trace_flags holds iter_ctrl options */ |
Ingo Molnar | 4e65551 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 143 | unsigned long trace_flags = TRACE_ITER_PRINT_PARENT; |
| 144 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 145 | /** |
| 146 | * trace_wake_up - wake up tasks waiting for trace input |
| 147 | * |
| 148 | * Simply wakes up any task that is blocked on the trace_wait |
| 149 | * queue. These is used with trace_poll for tasks polling the trace. |
| 150 | */ |
Ingo Molnar | 4e65551 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 151 | void trace_wake_up(void) |
| 152 | { |
Ingo Molnar | 017730c | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 153 | /* |
| 154 | * The runqueue_is_locked() can fail, but this is the best we |
| 155 | * have for now: |
| 156 | */ |
| 157 | if (!(trace_flags & TRACE_ITER_BLOCK) && !runqueue_is_locked()) |
Ingo Molnar | 4e65551 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 158 | wake_up(&trace_wait); |
| 159 | } |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 160 | |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 161 | #define ENTRIES_PER_PAGE (PAGE_SIZE / sizeof(struct trace_entry)) |
| 162 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 163 | static int __init set_nr_entries(char *str) |
| 164 | { |
Steven Rostedt | c6caeeb | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 165 | unsigned long nr_entries; |
| 166 | int ret; |
| 167 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 168 | if (!str) |
| 169 | return 0; |
Steven Rostedt | c6caeeb | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 170 | ret = strict_strtoul(str, 0, &nr_entries); |
| 171 | /* nr_entries can not be zero */ |
| 172 | if (ret < 0 || nr_entries == 0) |
| 173 | return 0; |
| 174 | trace_nr_entries = nr_entries; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 175 | return 1; |
| 176 | } |
| 177 | __setup("trace_entries=", set_nr_entries); |
| 178 | |
Steven Rostedt | 57f50be | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 179 | unsigned long nsecs_to_usecs(unsigned long nsecs) |
| 180 | { |
| 181 | return nsecs / 1000; |
| 182 | } |
| 183 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 184 | /* |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 185 | * TRACE_ITER_SYM_MASK masks the options in trace_flags that |
| 186 | * control the output of kernel symbols. |
| 187 | */ |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 188 | #define TRACE_ITER_SYM_MASK \ |
| 189 | (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR) |
| 190 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 191 | /* These must match the bit postions in trace_iterator_flags */ |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 192 | static const char *trace_options[] = { |
| 193 | "print-parent", |
| 194 | "sym-offset", |
| 195 | "sym-addr", |
| 196 | "verbose", |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 197 | "raw", |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 198 | "hex", |
Ingo Molnar | cb0f12a | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 199 | "bin", |
Soeren Sandmann Pedersen | 2a2cc8f | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 200 | "block", |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 201 | "stacktrace", |
Ingo Molnar | 4ac3ba4 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 202 | "sched-tree", |
Peter Zijlstra | f09ce57 | 2008-09-04 10:24:14 +0200 | [diff] [blame] | 203 | "ftrace_printk", |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 204 | NULL |
| 205 | }; |
| 206 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 207 | /* |
| 208 | * ftrace_max_lock is used to protect the swapping of buffers |
| 209 | * when taking a max snapshot. The buffers themselves are |
| 210 | * protected by per_cpu spinlocks. But the action of the swap |
| 211 | * needs its own lock. |
| 212 | * |
| 213 | * This is defined as a raw_spinlock_t in order to help |
| 214 | * with performance when lockdep debugging is enabled. |
| 215 | */ |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 216 | static raw_spinlock_t ftrace_max_lock = |
| 217 | (raw_spinlock_t)__RAW_SPIN_LOCK_UNLOCKED; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 218 | |
| 219 | /* |
| 220 | * Copy the new maximum trace into the separate maximum-trace |
| 221 | * structure. (this way the maximum trace is permanently saved, |
| 222 | * for later retrieval via /debugfs/tracing/latency_trace) |
| 223 | */ |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 224 | static void |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 225 | __update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu) |
| 226 | { |
| 227 | struct trace_array_cpu *data = tr->data[cpu]; |
| 228 | |
| 229 | max_tr.cpu = cpu; |
| 230 | max_tr.time_start = data->preempt_timestamp; |
| 231 | |
| 232 | data = max_tr.data[cpu]; |
| 233 | data->saved_latency = tracing_max_latency; |
| 234 | |
| 235 | memcpy(data->comm, tsk->comm, TASK_COMM_LEN); |
| 236 | data->pid = tsk->pid; |
| 237 | data->uid = tsk->uid; |
| 238 | data->nice = tsk->static_prio - 20 - MAX_RT_PRIO; |
| 239 | data->policy = tsk->policy; |
| 240 | data->rt_priority = tsk->rt_priority; |
| 241 | |
| 242 | /* record this tasks comm */ |
| 243 | tracing_record_cmdline(current); |
| 244 | } |
| 245 | |
Steven Rostedt | 19384c0 | 2008-05-22 00:22:16 -0400 | [diff] [blame] | 246 | #define CHECK_COND(cond) \ |
| 247 | if (unlikely(cond)) { \ |
| 248 | tracing_disabled = 1; \ |
| 249 | WARN_ON(1); \ |
| 250 | return -1; \ |
| 251 | } |
| 252 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 253 | /** |
| 254 | * check_pages - integrity check of trace buffers |
| 255 | * |
| 256 | * As a safty measure we check to make sure the data pages have not |
Steven Rostedt | 19384c0 | 2008-05-22 00:22:16 -0400 | [diff] [blame] | 257 | * been corrupted. |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 258 | */ |
Steven Rostedt | 19384c0 | 2008-05-22 00:22:16 -0400 | [diff] [blame] | 259 | int check_pages(struct trace_array_cpu *data) |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 260 | { |
| 261 | struct page *page, *tmp; |
| 262 | |
Steven Rostedt | 19384c0 | 2008-05-22 00:22:16 -0400 | [diff] [blame] | 263 | CHECK_COND(data->trace_pages.next->prev != &data->trace_pages); |
| 264 | CHECK_COND(data->trace_pages.prev->next != &data->trace_pages); |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 265 | |
| 266 | list_for_each_entry_safe(page, tmp, &data->trace_pages, lru) { |
Steven Rostedt | 19384c0 | 2008-05-22 00:22:16 -0400 | [diff] [blame] | 267 | CHECK_COND(page->lru.next->prev != &page->lru); |
| 268 | CHECK_COND(page->lru.prev->next != &page->lru); |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 269 | } |
Steven Rostedt | 19384c0 | 2008-05-22 00:22:16 -0400 | [diff] [blame] | 270 | |
| 271 | return 0; |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 272 | } |
| 273 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 274 | /** |
| 275 | * head_page - page address of the first page in per_cpu buffer. |
| 276 | * |
| 277 | * head_page returns the page address of the first page in |
| 278 | * a per_cpu buffer. This also preforms various consistency |
| 279 | * checks to make sure the buffer has not been corrupted. |
| 280 | */ |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 281 | void *head_page(struct trace_array_cpu *data) |
| 282 | { |
| 283 | struct page *page; |
| 284 | |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 285 | if (list_empty(&data->trace_pages)) |
| 286 | return NULL; |
| 287 | |
| 288 | page = list_entry(data->trace_pages.next, struct page, lru); |
| 289 | BUG_ON(&page->lru == &data->trace_pages); |
| 290 | |
| 291 | return page_address(page); |
| 292 | } |
| 293 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 294 | /** |
| 295 | * trace_seq_printf - sequence printing of trace information |
| 296 | * @s: trace sequence descriptor |
| 297 | * @fmt: printf format string |
| 298 | * |
| 299 | * The tracer may use either sequence operations or its own |
| 300 | * copy to user routines. To simplify formating of a trace |
| 301 | * trace_seq_printf is used to store strings into a special |
| 302 | * buffer (@s). Then the output may be either used by |
| 303 | * the sequencer or pulled into another buffer. |
| 304 | */ |
Thomas Gleixner | 72829bc | 2008-05-23 21:37:28 +0200 | [diff] [blame] | 305 | int |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 306 | trace_seq_printf(struct trace_seq *s, const char *fmt, ...) |
| 307 | { |
| 308 | int len = (PAGE_SIZE - 1) - s->len; |
| 309 | va_list ap; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 310 | int ret; |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 311 | |
| 312 | if (!len) |
| 313 | return 0; |
| 314 | |
| 315 | va_start(ap, fmt); |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 316 | ret = vsnprintf(s->buffer + s->len, len, fmt, ap); |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 317 | va_end(ap); |
| 318 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 319 | /* If we can't write it all, don't bother writing anything */ |
Thomas Gleixner | 72829bc | 2008-05-23 21:37:28 +0200 | [diff] [blame] | 320 | if (ret >= len) |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 321 | return 0; |
| 322 | |
| 323 | s->len += ret; |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 324 | |
| 325 | return len; |
| 326 | } |
| 327 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 328 | /** |
| 329 | * trace_seq_puts - trace sequence printing of simple string |
| 330 | * @s: trace sequence descriptor |
| 331 | * @str: simple string to record |
| 332 | * |
| 333 | * The tracer may use either the sequence operations or its own |
| 334 | * copy to user routines. This function records a simple string |
| 335 | * into a special buffer (@s) for later retrieval by a sequencer |
| 336 | * or other mechanism. |
| 337 | */ |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 338 | static int |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 339 | trace_seq_puts(struct trace_seq *s, const char *str) |
| 340 | { |
| 341 | int len = strlen(str); |
| 342 | |
| 343 | if (len > ((PAGE_SIZE - 1) - s->len)) |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 344 | return 0; |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 345 | |
| 346 | memcpy(s->buffer + s->len, str, len); |
| 347 | s->len += len; |
| 348 | |
| 349 | return len; |
| 350 | } |
| 351 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 352 | static int |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 353 | trace_seq_putc(struct trace_seq *s, unsigned char c) |
| 354 | { |
| 355 | if (s->len >= (PAGE_SIZE - 1)) |
| 356 | return 0; |
| 357 | |
| 358 | s->buffer[s->len++] = c; |
| 359 | |
| 360 | return 1; |
| 361 | } |
| 362 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 363 | static int |
Ingo Molnar | cb0f12a | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 364 | trace_seq_putmem(struct trace_seq *s, void *mem, size_t len) |
| 365 | { |
| 366 | if (len > ((PAGE_SIZE - 1) - s->len)) |
| 367 | return 0; |
| 368 | |
| 369 | memcpy(s->buffer + s->len, mem, len); |
| 370 | s->len += len; |
| 371 | |
| 372 | return len; |
| 373 | } |
| 374 | |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 375 | #define HEX_CHARS 17 |
Thomas Gleixner | 93dcc6e | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 376 | static const char hex2asc[] = "0123456789abcdef"; |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 377 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 378 | static int |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 379 | trace_seq_putmem_hex(struct trace_seq *s, void *mem, size_t len) |
| 380 | { |
| 381 | unsigned char hex[HEX_CHARS]; |
Thomas Gleixner | 93dcc6e | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 382 | unsigned char *data = mem; |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 383 | unsigned char byte; |
| 384 | int i, j; |
| 385 | |
| 386 | BUG_ON(len >= HEX_CHARS); |
| 387 | |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 388 | #ifdef __BIG_ENDIAN |
| 389 | for (i = 0, j = 0; i < len; i++) { |
| 390 | #else |
| 391 | for (i = len-1, j = 0; i >= 0; i--) { |
| 392 | #endif |
| 393 | byte = data[i]; |
| 394 | |
Thomas Gleixner | 93dcc6e | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 395 | hex[j++] = hex2asc[byte & 0x0f]; |
| 396 | hex[j++] = hex2asc[byte >> 4]; |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 397 | } |
Thomas Gleixner | 93dcc6e | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 398 | hex[j++] = ' '; |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 399 | |
| 400 | return trace_seq_putmem(s, hex, j); |
| 401 | } |
| 402 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 403 | static void |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 404 | trace_seq_reset(struct trace_seq *s) |
| 405 | { |
| 406 | s->len = 0; |
Pekka Paalanen | 6c6c279 | 2008-05-12 21:21:02 +0200 | [diff] [blame] | 407 | s->readpos = 0; |
| 408 | } |
| 409 | |
| 410 | ssize_t trace_seq_to_user(struct trace_seq *s, char __user *ubuf, size_t cnt) |
| 411 | { |
| 412 | int len; |
| 413 | int ret; |
| 414 | |
| 415 | if (s->len <= s->readpos) |
| 416 | return -EBUSY; |
| 417 | |
| 418 | len = s->len - s->readpos; |
| 419 | if (cnt > len) |
| 420 | cnt = len; |
| 421 | ret = copy_to_user(ubuf, s->buffer + s->readpos, cnt); |
| 422 | if (ret) |
| 423 | return -EFAULT; |
| 424 | |
| 425 | s->readpos += len; |
| 426 | return cnt; |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 427 | } |
| 428 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 429 | static void |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 430 | trace_print_seq(struct seq_file *m, struct trace_seq *s) |
| 431 | { |
| 432 | int len = s->len >= PAGE_SIZE ? PAGE_SIZE - 1 : s->len; |
| 433 | |
| 434 | s->buffer[len] = 0; |
| 435 | seq_puts(m, s->buffer); |
| 436 | |
| 437 | trace_seq_reset(s); |
| 438 | } |
| 439 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 440 | /* |
| 441 | * flip the trace buffers between two trace descriptors. |
| 442 | * This usually is the buffers between the global_trace and |
| 443 | * the max_tr to record a snapshot of a current trace. |
| 444 | * |
| 445 | * The ftrace_max_lock must be held. |
| 446 | */ |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 447 | static void |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 448 | flip_trace(struct trace_array_cpu *tr1, struct trace_array_cpu *tr2) |
| 449 | { |
| 450 | struct list_head flip_pages; |
| 451 | |
| 452 | INIT_LIST_HEAD(&flip_pages); |
| 453 | |
Steven Rostedt | 93a588f | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 454 | memcpy(&tr1->trace_head_idx, &tr2->trace_head_idx, |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 455 | sizeof(struct trace_array_cpu) - |
Steven Rostedt | 93a588f | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 456 | offsetof(struct trace_array_cpu, trace_head_idx)); |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 457 | |
| 458 | check_pages(tr1); |
| 459 | check_pages(tr2); |
| 460 | list_splice_init(&tr1->trace_pages, &flip_pages); |
| 461 | list_splice_init(&tr2->trace_pages, &tr1->trace_pages); |
| 462 | list_splice_init(&flip_pages, &tr2->trace_pages); |
| 463 | BUG_ON(!list_empty(&flip_pages)); |
| 464 | check_pages(tr1); |
| 465 | check_pages(tr2); |
| 466 | } |
| 467 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 468 | /** |
| 469 | * update_max_tr - snapshot all trace buffers from global_trace to max_tr |
| 470 | * @tr: tracer |
| 471 | * @tsk: the task with the latency |
| 472 | * @cpu: The cpu that initiated the trace. |
| 473 | * |
| 474 | * Flip the buffers between the @tr and the max_tr and record information |
| 475 | * about which task was the cause of this latency. |
| 476 | */ |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 477 | void |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 478 | update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu) |
| 479 | { |
| 480 | struct trace_array_cpu *data; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 481 | int i; |
| 482 | |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 483 | WARN_ON_ONCE(!irqs_disabled()); |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 484 | __raw_spin_lock(&ftrace_max_lock); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 485 | /* clear out all the previous traces */ |
Steven Rostedt | ab46428 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 486 | for_each_tracing_cpu(i) { |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 487 | data = tr->data[i]; |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 488 | flip_trace(max_tr.data[i], data); |
Steven Rostedt | 89b2f97 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 489 | tracing_reset(data); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 490 | } |
| 491 | |
| 492 | __update_max_tr(tr, tsk, cpu); |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 493 | __raw_spin_unlock(&ftrace_max_lock); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 494 | } |
| 495 | |
| 496 | /** |
| 497 | * update_max_tr_single - only copy one trace over, and reset the rest |
| 498 | * @tr - tracer |
| 499 | * @tsk - task with the latency |
| 500 | * @cpu - the cpu of the buffer to copy. |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 501 | * |
| 502 | * Flip the trace of a single CPU buffer between the @tr and the max_tr. |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 503 | */ |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 504 | void |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 505 | update_max_tr_single(struct trace_array *tr, struct task_struct *tsk, int cpu) |
| 506 | { |
| 507 | struct trace_array_cpu *data = tr->data[cpu]; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 508 | int i; |
| 509 | |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 510 | WARN_ON_ONCE(!irqs_disabled()); |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 511 | __raw_spin_lock(&ftrace_max_lock); |
Steven Rostedt | ab46428 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 512 | for_each_tracing_cpu(i) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 513 | tracing_reset(max_tr.data[i]); |
| 514 | |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 515 | flip_trace(max_tr.data[cpu], data); |
Steven Rostedt | 89b2f97 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 516 | tracing_reset(data); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 517 | |
| 518 | __update_max_tr(tr, tsk, cpu); |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 519 | __raw_spin_unlock(&ftrace_max_lock); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 520 | } |
| 521 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 522 | /** |
| 523 | * register_tracer - register a tracer with the ftrace system. |
| 524 | * @type - the plugin for the tracer |
| 525 | * |
| 526 | * Register a new plugin tracer. |
| 527 | */ |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 528 | int register_tracer(struct tracer *type) |
| 529 | { |
| 530 | struct tracer *t; |
| 531 | int len; |
| 532 | int ret = 0; |
| 533 | |
| 534 | if (!type->name) { |
| 535 | pr_info("Tracer must have a name\n"); |
| 536 | return -1; |
| 537 | } |
| 538 | |
| 539 | mutex_lock(&trace_types_lock); |
| 540 | for (t = trace_types; t; t = t->next) { |
| 541 | if (strcmp(type->name, t->name) == 0) { |
| 542 | /* already found */ |
| 543 | pr_info("Trace %s already registered\n", |
| 544 | type->name); |
| 545 | ret = -1; |
| 546 | goto out; |
| 547 | } |
| 548 | } |
| 549 | |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 550 | #ifdef CONFIG_FTRACE_STARTUP_TEST |
| 551 | if (type->selftest) { |
| 552 | struct tracer *saved_tracer = current_trace; |
| 553 | struct trace_array_cpu *data; |
| 554 | struct trace_array *tr = &global_trace; |
| 555 | int saved_ctrl = tr->ctrl; |
| 556 | int i; |
| 557 | /* |
| 558 | * Run a selftest on this tracer. |
| 559 | * Here we reset the trace buffer, and set the current |
| 560 | * tracer to be this tracer. The tracer can then run some |
| 561 | * internal tracing to verify that everything is in order. |
| 562 | * If we fail, we do not register this tracer. |
| 563 | */ |
Steven Rostedt | ab46428 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 564 | for_each_tracing_cpu(i) { |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 565 | data = tr->data[i]; |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 566 | if (!head_page(data)) |
| 567 | continue; |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 568 | tracing_reset(data); |
| 569 | } |
| 570 | current_trace = type; |
| 571 | tr->ctrl = 0; |
| 572 | /* the test is responsible for initializing and enabling */ |
| 573 | pr_info("Testing tracer %s: ", type->name); |
| 574 | ret = type->selftest(type, tr); |
| 575 | /* the test is responsible for resetting too */ |
| 576 | current_trace = saved_tracer; |
| 577 | tr->ctrl = saved_ctrl; |
| 578 | if (ret) { |
| 579 | printk(KERN_CONT "FAILED!\n"); |
| 580 | goto out; |
| 581 | } |
Steven Rostedt | 1d4db00 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 582 | /* Only reset on passing, to avoid touching corrupted buffers */ |
Steven Rostedt | ab46428 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 583 | for_each_tracing_cpu(i) { |
Steven Rostedt | 1d4db00 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 584 | data = tr->data[i]; |
| 585 | if (!head_page(data)) |
| 586 | continue; |
| 587 | tracing_reset(data); |
| 588 | } |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 589 | printk(KERN_CONT "PASSED\n"); |
| 590 | } |
| 591 | #endif |
| 592 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 593 | type->next = trace_types; |
| 594 | trace_types = type; |
| 595 | len = strlen(type->name); |
| 596 | if (len > max_tracer_type_len) |
| 597 | max_tracer_type_len = len; |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 598 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 599 | out: |
| 600 | mutex_unlock(&trace_types_lock); |
| 601 | |
| 602 | return ret; |
| 603 | } |
| 604 | |
| 605 | void unregister_tracer(struct tracer *type) |
| 606 | { |
| 607 | struct tracer **t; |
| 608 | int len; |
| 609 | |
| 610 | mutex_lock(&trace_types_lock); |
| 611 | for (t = &trace_types; *t; t = &(*t)->next) { |
| 612 | if (*t == type) |
| 613 | goto found; |
| 614 | } |
| 615 | pr_info("Trace %s not registered\n", type->name); |
| 616 | goto out; |
| 617 | |
| 618 | found: |
| 619 | *t = (*t)->next; |
| 620 | if (strlen(type->name) != max_tracer_type_len) |
| 621 | goto out; |
| 622 | |
| 623 | max_tracer_type_len = 0; |
| 624 | for (t = &trace_types; *t; t = &(*t)->next) { |
| 625 | len = strlen((*t)->name); |
| 626 | if (len > max_tracer_type_len) |
| 627 | max_tracer_type_len = len; |
| 628 | } |
| 629 | out: |
| 630 | mutex_unlock(&trace_types_lock); |
| 631 | } |
| 632 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 633 | void tracing_reset(struct trace_array_cpu *data) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 634 | { |
| 635 | data->trace_idx = 0; |
Steven Rostedt | 53d0aa7 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 636 | data->overrun = 0; |
Steven Rostedt | 93a588f | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 637 | data->trace_head = data->trace_tail = head_page(data); |
| 638 | data->trace_head_idx = 0; |
| 639 | data->trace_tail_idx = 0; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 640 | } |
| 641 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 642 | #define SAVED_CMDLINES 128 |
| 643 | static unsigned map_pid_to_cmdline[PID_MAX_DEFAULT+1]; |
| 644 | static unsigned map_cmdline_to_pid[SAVED_CMDLINES]; |
| 645 | static char saved_cmdlines[SAVED_CMDLINES][TASK_COMM_LEN]; |
| 646 | static int cmdline_idx; |
| 647 | static DEFINE_SPINLOCK(trace_cmdline_lock); |
Steven Rostedt | 25b0b44 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 648 | |
Steven Rostedt | 25b0b44 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 649 | /* temporary disable recording */ |
| 650 | atomic_t trace_record_cmdline_disabled __read_mostly; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 651 | |
| 652 | static void trace_init_cmdlines(void) |
| 653 | { |
| 654 | memset(&map_pid_to_cmdline, -1, sizeof(map_pid_to_cmdline)); |
| 655 | memset(&map_cmdline_to_pid, -1, sizeof(map_cmdline_to_pid)); |
| 656 | cmdline_idx = 0; |
| 657 | } |
| 658 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 659 | void trace_stop_cmdline_recording(void); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 660 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 661 | static void trace_save_cmdline(struct task_struct *tsk) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 662 | { |
| 663 | unsigned map; |
| 664 | unsigned idx; |
| 665 | |
| 666 | if (!tsk->pid || unlikely(tsk->pid > PID_MAX_DEFAULT)) |
| 667 | return; |
| 668 | |
| 669 | /* |
| 670 | * It's not the end of the world if we don't get |
| 671 | * the lock, but we also don't want to spin |
| 672 | * nor do we want to disable interrupts, |
| 673 | * so if we miss here, then better luck next time. |
| 674 | */ |
| 675 | if (!spin_trylock(&trace_cmdline_lock)) |
| 676 | return; |
| 677 | |
| 678 | idx = map_pid_to_cmdline[tsk->pid]; |
| 679 | if (idx >= SAVED_CMDLINES) { |
| 680 | idx = (cmdline_idx + 1) % SAVED_CMDLINES; |
| 681 | |
| 682 | map = map_cmdline_to_pid[idx]; |
| 683 | if (map <= PID_MAX_DEFAULT) |
| 684 | map_pid_to_cmdline[map] = (unsigned)-1; |
| 685 | |
| 686 | map_pid_to_cmdline[tsk->pid] = idx; |
| 687 | |
| 688 | cmdline_idx = idx; |
| 689 | } |
| 690 | |
| 691 | memcpy(&saved_cmdlines[idx], tsk->comm, TASK_COMM_LEN); |
| 692 | |
| 693 | spin_unlock(&trace_cmdline_lock); |
| 694 | } |
| 695 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 696 | static char *trace_find_cmdline(int pid) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 697 | { |
| 698 | char *cmdline = "<...>"; |
| 699 | unsigned map; |
| 700 | |
| 701 | if (!pid) |
| 702 | return "<idle>"; |
| 703 | |
| 704 | if (pid > PID_MAX_DEFAULT) |
| 705 | goto out; |
| 706 | |
| 707 | map = map_pid_to_cmdline[pid]; |
| 708 | if (map >= SAVED_CMDLINES) |
| 709 | goto out; |
| 710 | |
| 711 | cmdline = saved_cmdlines[map]; |
| 712 | |
| 713 | out: |
| 714 | return cmdline; |
| 715 | } |
| 716 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 717 | void tracing_record_cmdline(struct task_struct *tsk) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 718 | { |
| 719 | if (atomic_read(&trace_record_cmdline_disabled)) |
| 720 | return; |
| 721 | |
| 722 | trace_save_cmdline(tsk); |
| 723 | } |
| 724 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 725 | static inline struct list_head * |
Steven Rostedt | 93a588f | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 726 | trace_next_list(struct trace_array_cpu *data, struct list_head *next) |
| 727 | { |
| 728 | /* |
| 729 | * Roundrobin - but skip the head (which is not a real page): |
| 730 | */ |
| 731 | next = next->next; |
| 732 | if (unlikely(next == &data->trace_pages)) |
| 733 | next = next->next; |
| 734 | BUG_ON(next == &data->trace_pages); |
| 735 | |
| 736 | return next; |
| 737 | } |
| 738 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 739 | static inline void * |
Steven Rostedt | 93a588f | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 740 | trace_next_page(struct trace_array_cpu *data, void *addr) |
| 741 | { |
| 742 | struct list_head *next; |
| 743 | struct page *page; |
| 744 | |
| 745 | page = virt_to_page(addr); |
| 746 | |
| 747 | next = trace_next_list(data, &page->lru); |
| 748 | page = list_entry(next, struct page, lru); |
| 749 | |
| 750 | return page_address(page); |
| 751 | } |
| 752 | |
Pekka Paalanen | 45dcd8b | 2008-09-16 21:56:41 +0300 | [diff] [blame] | 753 | struct trace_entry * |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 754 | tracing_get_trace_entry(struct trace_array *tr, struct trace_array_cpu *data) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 755 | { |
| 756 | unsigned long idx, idx_next; |
| 757 | struct trace_entry *entry; |
| 758 | |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 759 | data->trace_idx++; |
Steven Rostedt | 93a588f | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 760 | idx = data->trace_head_idx; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 761 | idx_next = idx + 1; |
| 762 | |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 763 | BUG_ON(idx * TRACE_ENTRY_SIZE >= PAGE_SIZE); |
| 764 | |
Steven Rostedt | 93a588f | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 765 | entry = data->trace_head + idx * TRACE_ENTRY_SIZE; |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 766 | |
| 767 | if (unlikely(idx_next >= ENTRIES_PER_PAGE)) { |
Steven Rostedt | 93a588f | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 768 | data->trace_head = trace_next_page(data, data->trace_head); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 769 | idx_next = 0; |
| 770 | } |
| 771 | |
Steven Rostedt | 93a588f | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 772 | if (data->trace_head == data->trace_tail && |
| 773 | idx_next == data->trace_tail_idx) { |
| 774 | /* overrun */ |
Steven Rostedt | 53d0aa7 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 775 | data->overrun++; |
Steven Rostedt | 93a588f | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 776 | data->trace_tail_idx++; |
| 777 | if (data->trace_tail_idx >= ENTRIES_PER_PAGE) { |
| 778 | data->trace_tail = |
| 779 | trace_next_page(data, data->trace_tail); |
| 780 | data->trace_tail_idx = 0; |
| 781 | } |
| 782 | } |
| 783 | |
| 784 | data->trace_head_idx = idx_next; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 785 | |
| 786 | return entry; |
| 787 | } |
| 788 | |
Pekka Paalanen | 45dcd8b | 2008-09-16 21:56:41 +0300 | [diff] [blame] | 789 | void |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 790 | tracing_generic_entry_update(struct trace_entry *entry, unsigned long flags) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 791 | { |
| 792 | struct task_struct *tsk = current; |
| 793 | unsigned long pc; |
| 794 | |
| 795 | pc = preempt_count(); |
| 796 | |
Steven Rostedt | 2e2ca15 | 2008-08-01 12:26:40 -0400 | [diff] [blame] | 797 | entry->field.preempt_count = pc & 0xff; |
| 798 | entry->field.pid = (tsk) ? tsk->pid : 0; |
| 799 | entry->field.t = ftrace_now(raw_smp_processor_id()); |
| 800 | entry->field.flags = |
| 801 | (irqs_disabled_flags(flags) ? TRACE_FLAG_IRQS_OFF : 0) | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 802 | ((pc & HARDIRQ_MASK) ? TRACE_FLAG_HARDIRQ : 0) | |
| 803 | ((pc & SOFTIRQ_MASK) ? TRACE_FLAG_SOFTIRQ : 0) | |
| 804 | (need_resched() ? TRACE_FLAG_NEED_RESCHED : 0); |
| 805 | } |
| 806 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 807 | void |
Steven Rostedt | 6fb44b7 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 808 | trace_function(struct trace_array *tr, struct trace_array_cpu *data, |
| 809 | unsigned long ip, unsigned long parent_ip, unsigned long flags) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 810 | { |
| 811 | struct trace_entry *entry; |
Ingo Molnar | dcb6308 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 812 | unsigned long irq_flags; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 813 | |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 814 | raw_local_irq_save(irq_flags); |
| 815 | __raw_spin_lock(&data->lock); |
Steven Rostedt | 2e2ca15 | 2008-08-01 12:26:40 -0400 | [diff] [blame] | 816 | entry = tracing_get_trace_entry(tr, data); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 817 | tracing_generic_entry_update(entry, flags); |
Steven Rostedt | 2e2ca15 | 2008-08-01 12:26:40 -0400 | [diff] [blame] | 818 | entry->type = TRACE_FN; |
| 819 | entry->field.fn.ip = ip; |
| 820 | entry->field.fn.parent_ip = parent_ip; |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 821 | __raw_spin_unlock(&data->lock); |
| 822 | raw_local_irq_restore(irq_flags); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 823 | } |
| 824 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 825 | void |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 826 | ftrace(struct trace_array *tr, struct trace_array_cpu *data, |
| 827 | unsigned long ip, unsigned long parent_ip, unsigned long flags) |
| 828 | { |
| 829 | if (likely(!atomic_read(&data->disabled))) |
Steven Rostedt | 6fb44b7 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 830 | trace_function(tr, data, ip, parent_ip, flags); |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 831 | } |
| 832 | |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 833 | void __trace_stack(struct trace_array *tr, |
| 834 | struct trace_array_cpu *data, |
| 835 | unsigned long flags, |
| 836 | int skip) |
| 837 | { |
| 838 | struct trace_entry *entry; |
| 839 | struct stack_trace trace; |
| 840 | |
| 841 | if (!(trace_flags & TRACE_ITER_STACKTRACE)) |
| 842 | return; |
| 843 | |
| 844 | entry = tracing_get_trace_entry(tr, data); |
| 845 | tracing_generic_entry_update(entry, flags); |
| 846 | entry->type = TRACE_STACK; |
| 847 | |
Steven Rostedt | 2e2ca15 | 2008-08-01 12:26:40 -0400 | [diff] [blame] | 848 | memset(&entry->field.stack, 0, sizeof(entry->field.stack)); |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 849 | |
| 850 | trace.nr_entries = 0; |
| 851 | trace.max_entries = FTRACE_STACK_ENTRIES; |
| 852 | trace.skip = skip; |
Steven Rostedt | 2e2ca15 | 2008-08-01 12:26:40 -0400 | [diff] [blame] | 853 | trace.entries = entry->field.stack.caller; |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 854 | |
| 855 | save_stack_trace(&trace); |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 856 | } |
| 857 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 858 | void |
Ingo Molnar | a4feb83 | 2008-05-12 21:21:02 +0200 | [diff] [blame] | 859 | __trace_special(void *__tr, void *__data, |
| 860 | unsigned long arg1, unsigned long arg2, unsigned long arg3) |
| 861 | { |
| 862 | struct trace_array_cpu *data = __data; |
| 863 | struct trace_array *tr = __tr; |
| 864 | struct trace_entry *entry; |
| 865 | unsigned long irq_flags; |
| 866 | |
| 867 | raw_local_irq_save(irq_flags); |
| 868 | __raw_spin_lock(&data->lock); |
Steven Rostedt | 2e2ca15 | 2008-08-01 12:26:40 -0400 | [diff] [blame] | 869 | entry = tracing_get_trace_entry(tr, data); |
Ingo Molnar | a4feb83 | 2008-05-12 21:21:02 +0200 | [diff] [blame] | 870 | tracing_generic_entry_update(entry, 0); |
Steven Rostedt | 2e2ca15 | 2008-08-01 12:26:40 -0400 | [diff] [blame] | 871 | entry->type = TRACE_SPECIAL; |
| 872 | entry->field.special.arg1 = arg1; |
| 873 | entry->field.special.arg2 = arg2; |
| 874 | entry->field.special.arg3 = arg3; |
Ingo Molnar | a4feb83 | 2008-05-12 21:21:02 +0200 | [diff] [blame] | 875 | __trace_stack(tr, data, irq_flags, 4); |
| 876 | __raw_spin_unlock(&data->lock); |
| 877 | raw_local_irq_restore(irq_flags); |
| 878 | |
| 879 | trace_wake_up(); |
| 880 | } |
| 881 | |
| 882 | void |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 883 | tracing_sched_switch_trace(struct trace_array *tr, |
| 884 | struct trace_array_cpu *data, |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 885 | struct task_struct *prev, |
| 886 | struct task_struct *next, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 887 | unsigned long flags) |
| 888 | { |
| 889 | struct trace_entry *entry; |
Ingo Molnar | dcb6308 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 890 | unsigned long irq_flags; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 891 | |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 892 | raw_local_irq_save(irq_flags); |
| 893 | __raw_spin_lock(&data->lock); |
Steven Rostedt | 2e2ca15 | 2008-08-01 12:26:40 -0400 | [diff] [blame] | 894 | entry = tracing_get_trace_entry(tr, data); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 895 | tracing_generic_entry_update(entry, flags); |
Steven Rostedt | 2e2ca15 | 2008-08-01 12:26:40 -0400 | [diff] [blame] | 896 | entry->type = TRACE_CTX; |
| 897 | entry->field.ctx.prev_pid = prev->pid; |
| 898 | entry->field.ctx.prev_prio = prev->prio; |
| 899 | entry->field.ctx.prev_state = prev->state; |
| 900 | entry->field.ctx.next_pid = next->pid; |
| 901 | entry->field.ctx.next_prio = next->prio; |
| 902 | entry->field.ctx.next_state = next->state; |
Peter Zijlstra | 80b5e94 | 2008-09-04 10:24:16 +0200 | [diff] [blame] | 903 | entry->field.ctx.next_cpu = task_cpu(next); |
Ingo Molnar | 74f4e36 | 2008-05-12 21:21:15 +0200 | [diff] [blame] | 904 | __trace_stack(tr, data, flags, 5); |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 905 | __raw_spin_unlock(&data->lock); |
| 906 | raw_local_irq_restore(irq_flags); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 907 | } |
| 908 | |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 909 | void |
| 910 | tracing_sched_wakeup_trace(struct trace_array *tr, |
| 911 | struct trace_array_cpu *data, |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 912 | struct task_struct *wakee, |
| 913 | struct task_struct *curr, |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 914 | unsigned long flags) |
| 915 | { |
| 916 | struct trace_entry *entry; |
| 917 | unsigned long irq_flags; |
| 918 | |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 919 | raw_local_irq_save(irq_flags); |
| 920 | __raw_spin_lock(&data->lock); |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 921 | entry = tracing_get_trace_entry(tr, data); |
| 922 | tracing_generic_entry_update(entry, flags); |
| 923 | entry->type = TRACE_WAKE; |
Steven Rostedt | 2e2ca15 | 2008-08-01 12:26:40 -0400 | [diff] [blame] | 924 | entry->field.ctx.prev_pid = curr->pid; |
| 925 | entry->field.ctx.prev_prio = curr->prio; |
| 926 | entry->field.ctx.prev_state = curr->state; |
| 927 | entry->field.ctx.next_pid = wakee->pid; |
| 928 | entry->field.ctx.next_prio = wakee->prio; |
| 929 | entry->field.ctx.next_state = wakee->state; |
Peter Zijlstra | 80b5e94 | 2008-09-04 10:24:16 +0200 | [diff] [blame] | 930 | entry->field.ctx.next_cpu = task_cpu(wakee); |
Ingo Molnar | 74f4e36 | 2008-05-12 21:21:15 +0200 | [diff] [blame] | 931 | __trace_stack(tr, data, flags, 6); |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 932 | __raw_spin_unlock(&data->lock); |
| 933 | raw_local_irq_restore(irq_flags); |
Ingo Molnar | 017730c | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 934 | |
| 935 | trace_wake_up(); |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 936 | } |
| 937 | |
Steven Rostedt | 4902f88 | 2008-05-22 00:22:18 -0400 | [diff] [blame] | 938 | void |
| 939 | ftrace_special(unsigned long arg1, unsigned long arg2, unsigned long arg3) |
| 940 | { |
| 941 | struct trace_array *tr = &global_trace; |
| 942 | struct trace_array_cpu *data; |
| 943 | unsigned long flags; |
| 944 | long disabled; |
| 945 | int cpu; |
| 946 | |
Frédéric Weisbecker | 43a1538 | 2008-09-21 20:16:30 +0200 | [diff] [blame] | 947 | if (tracing_disabled || !tr->ctrl) |
Steven Rostedt | 4902f88 | 2008-05-22 00:22:18 -0400 | [diff] [blame] | 948 | return; |
| 949 | |
| 950 | local_irq_save(flags); |
| 951 | cpu = raw_smp_processor_id(); |
| 952 | data = tr->data[cpu]; |
| 953 | disabled = atomic_inc_return(&data->disabled); |
| 954 | |
| 955 | if (likely(disabled == 1)) |
| 956 | __trace_special(tr, data, arg1, arg2, arg3); |
| 957 | |
| 958 | atomic_dec(&data->disabled); |
| 959 | local_irq_restore(flags); |
| 960 | } |
| 961 | |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 962 | #ifdef CONFIG_FTRACE |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 963 | static void |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 964 | function_trace_call(unsigned long ip, unsigned long parent_ip) |
| 965 | { |
| 966 | struct trace_array *tr = &global_trace; |
| 967 | struct trace_array_cpu *data; |
| 968 | unsigned long flags; |
| 969 | long disabled; |
| 970 | int cpu; |
| 971 | |
Steven Rostedt | 60bc080 | 2008-07-10 20:58:16 -0400 | [diff] [blame] | 972 | if (unlikely(!ftrace_function_enabled)) |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 973 | return; |
| 974 | |
Abhishek Sagar | ecea656 | 2008-06-21 23:47:53 +0530 | [diff] [blame] | 975 | if (skip_trace(ip)) |
| 976 | return; |
| 977 | |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 978 | local_irq_save(flags); |
| 979 | cpu = raw_smp_processor_id(); |
| 980 | data = tr->data[cpu]; |
| 981 | disabled = atomic_inc_return(&data->disabled); |
| 982 | |
| 983 | if (likely(disabled == 1)) |
Steven Rostedt | 6fb44b7 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 984 | trace_function(tr, data, ip, parent_ip, flags); |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 985 | |
| 986 | atomic_dec(&data->disabled); |
| 987 | local_irq_restore(flags); |
| 988 | } |
| 989 | |
| 990 | static struct ftrace_ops trace_ops __read_mostly = |
| 991 | { |
| 992 | .func = function_trace_call, |
| 993 | }; |
| 994 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 995 | void tracing_start_function_trace(void) |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 996 | { |
Steven Rostedt | 60bc080 | 2008-07-10 20:58:16 -0400 | [diff] [blame] | 997 | ftrace_function_enabled = 0; |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 998 | register_ftrace_function(&trace_ops); |
Steven Rostedt | 60bc080 | 2008-07-10 20:58:16 -0400 | [diff] [blame] | 999 | if (tracer_enabled) |
| 1000 | ftrace_function_enabled = 1; |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1001 | } |
| 1002 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1003 | void tracing_stop_function_trace(void) |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1004 | { |
Steven Rostedt | 60bc080 | 2008-07-10 20:58:16 -0400 | [diff] [blame] | 1005 | ftrace_function_enabled = 0; |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1006 | unregister_ftrace_function(&trace_ops); |
| 1007 | } |
| 1008 | #endif |
| 1009 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1010 | enum trace_file_type { |
| 1011 | TRACE_FILE_LAT_FMT = 1, |
| 1012 | }; |
| 1013 | |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1014 | /* Return the current entry. */ |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1015 | static struct trace_entry * |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1016 | trace_entry_idx(struct trace_array *tr, struct trace_array_cpu *data, |
| 1017 | struct trace_iterator *iter, int cpu) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1018 | { |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1019 | struct page *page; |
| 1020 | struct trace_entry *array; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1021 | |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1022 | if (iter->next_idx[cpu] >= tr->entries || |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1023 | iter->next_idx[cpu] >= data->trace_idx || |
| 1024 | (data->trace_head == data->trace_tail && |
| 1025 | data->trace_head_idx == data->trace_tail_idx)) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1026 | return NULL; |
| 1027 | |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1028 | if (!iter->next_page[cpu]) { |
Steven Rostedt | 93a588f | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 1029 | /* Initialize the iterator for this cpu trace buffer */ |
| 1030 | WARN_ON(!data->trace_tail); |
| 1031 | page = virt_to_page(data->trace_tail); |
| 1032 | iter->next_page[cpu] = &page->lru; |
| 1033 | iter->next_page_idx[cpu] = data->trace_tail_idx; |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1034 | } |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1035 | |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1036 | page = list_entry(iter->next_page[cpu], struct page, lru); |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 1037 | BUG_ON(&data->trace_pages == &page->lru); |
| 1038 | |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1039 | array = page_address(page); |
| 1040 | |
Steven Rostedt | 93a588f | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 1041 | WARN_ON(iter->next_page_idx[cpu] >= ENTRIES_PER_PAGE); |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1042 | return &array[iter->next_page_idx[cpu]]; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1043 | } |
| 1044 | |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1045 | /* Increment the index counter of an iterator by one */ |
Steven Rostedt | 5a90f57 | 2008-09-03 17:42:51 -0400 | [diff] [blame] | 1046 | static void __trace_iterator_increment(struct trace_iterator *iter, int cpu) |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1047 | { |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1048 | iter->next_idx[cpu]++; |
| 1049 | iter->next_page_idx[cpu]++; |
| 1050 | |
| 1051 | if (iter->next_page_idx[cpu] >= ENTRIES_PER_PAGE) { |
| 1052 | struct trace_array_cpu *data = iter->tr->data[cpu]; |
| 1053 | |
| 1054 | iter->next_page_idx[cpu] = 0; |
| 1055 | iter->next_page[cpu] = |
| 1056 | trace_next_list(data, iter->next_page[cpu]); |
| 1057 | } |
| 1058 | } |
| 1059 | |
Steven Rostedt | 5a90f57 | 2008-09-03 17:42:51 -0400 | [diff] [blame] | 1060 | static void trace_iterator_increment(struct trace_iterator *iter, int cpu) |
| 1061 | { |
| 1062 | iter->idx++; |
| 1063 | __trace_iterator_increment(iter, cpu); |
| 1064 | } |
| 1065 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1066 | static struct trace_entry * |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1067 | trace_entry_next(struct trace_array *tr, struct trace_array_cpu *data, |
| 1068 | struct trace_iterator *iter, int cpu) |
| 1069 | { |
| 1070 | struct list_head *next_page; |
| 1071 | struct trace_entry *ent; |
| 1072 | int idx, next_idx, next_page_idx; |
| 1073 | |
| 1074 | ent = trace_entry_idx(tr, tr->data[cpu], iter, cpu); |
| 1075 | |
| 1076 | if (likely(!ent || ent->type != TRACE_CONT)) |
| 1077 | return ent; |
| 1078 | |
| 1079 | /* save the iterator details */ |
| 1080 | idx = iter->idx; |
| 1081 | next_idx = iter->next_idx[cpu]; |
| 1082 | next_page_idx = iter->next_page_idx[cpu]; |
| 1083 | next_page = iter->next_page[cpu]; |
| 1084 | |
| 1085 | /* find a real entry */ |
| 1086 | do { |
Steven Rostedt | 5a90f57 | 2008-09-03 17:42:51 -0400 | [diff] [blame] | 1087 | __trace_iterator_increment(iter, cpu); |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1088 | ent = trace_entry_idx(tr, tr->data[cpu], iter, cpu); |
| 1089 | } while (ent && ent->type != TRACE_CONT); |
| 1090 | |
| 1091 | /* reset the iterator */ |
| 1092 | iter->idx = idx; |
| 1093 | iter->next_idx[cpu] = next_idx; |
| 1094 | iter->next_page_idx[cpu] = next_page_idx; |
| 1095 | iter->next_page[cpu] = next_page; |
| 1096 | |
| 1097 | return ent; |
| 1098 | } |
| 1099 | |
| 1100 | static struct trace_entry * |
| 1101 | __find_next_entry(struct trace_iterator *iter, int *ent_cpu, int inc) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1102 | { |
| 1103 | struct trace_array *tr = iter->tr; |
| 1104 | struct trace_entry *ent, *next = NULL; |
| 1105 | int next_cpu = -1; |
| 1106 | int cpu; |
| 1107 | |
Steven Rostedt | ab46428 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 1108 | for_each_tracing_cpu(cpu) { |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 1109 | if (!head_page(tr->data[cpu])) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1110 | continue; |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1111 | |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1112 | ent = trace_entry_idx(tr, tr->data[cpu], iter, cpu); |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1113 | |
| 1114 | if (ent && ent->type == TRACE_CONT) { |
| 1115 | struct trace_array_cpu *data = tr->data[cpu]; |
| 1116 | |
| 1117 | if (!inc) |
| 1118 | ent = trace_entry_next(tr, data, iter, cpu); |
| 1119 | else { |
| 1120 | while (ent && ent->type == TRACE_CONT) { |
Steven Rostedt | 5a90f57 | 2008-09-03 17:42:51 -0400 | [diff] [blame] | 1121 | __trace_iterator_increment(iter, cpu); |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1122 | ent = trace_entry_idx(tr, tr->data[cpu], |
| 1123 | iter, cpu); |
| 1124 | } |
| 1125 | } |
| 1126 | } |
| 1127 | |
Ingo Molnar | cdd31cd | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1128 | /* |
| 1129 | * Pick the entry with the smallest timestamp: |
| 1130 | */ |
Steven Rostedt | 2e2ca15 | 2008-08-01 12:26:40 -0400 | [diff] [blame] | 1131 | if (ent && (!next || ent->field.t < next->field.t)) { |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1132 | next = ent; |
| 1133 | next_cpu = cpu; |
| 1134 | } |
| 1135 | } |
| 1136 | |
| 1137 | if (ent_cpu) |
| 1138 | *ent_cpu = next_cpu; |
| 1139 | |
| 1140 | return next; |
| 1141 | } |
| 1142 | |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1143 | /* Find the next real entry, without updating the iterator itself */ |
| 1144 | static struct trace_entry * |
| 1145 | find_next_entry(struct trace_iterator *iter, int *ent_cpu) |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1146 | { |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1147 | return __find_next_entry(iter, ent_cpu, 0); |
| 1148 | } |
Ingo Molnar | 8c523a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1149 | |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1150 | /* Find the next real entry, and increment the iterator to the next entry */ |
| 1151 | static void *find_next_entry_inc(struct trace_iterator *iter) |
| 1152 | { |
| 1153 | struct trace_entry *next; |
| 1154 | int next_cpu = -1; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1155 | |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1156 | next = __find_next_entry(iter, &next_cpu, 1); |
| 1157 | |
| 1158 | iter->prev_ent = iter->ent; |
| 1159 | iter->prev_cpu = iter->cpu; |
| 1160 | |
| 1161 | iter->ent = next; |
| 1162 | iter->cpu = next_cpu; |
| 1163 | |
| 1164 | if (next) |
| 1165 | trace_iterator_increment(iter, iter->cpu); |
| 1166 | |
| 1167 | return next ? iter : NULL; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1168 | } |
| 1169 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1170 | static void trace_consume(struct trace_iterator *iter) |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1171 | { |
| 1172 | struct trace_array_cpu *data = iter->tr->data[iter->cpu]; |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1173 | struct trace_entry *ent; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1174 | |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1175 | again: |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1176 | data->trace_tail_idx++; |
| 1177 | if (data->trace_tail_idx >= ENTRIES_PER_PAGE) { |
| 1178 | data->trace_tail = trace_next_page(data, data->trace_tail); |
| 1179 | data->trace_tail_idx = 0; |
| 1180 | } |
| 1181 | |
| 1182 | /* Check if we empty it, then reset the index */ |
| 1183 | if (data->trace_head == data->trace_tail && |
| 1184 | data->trace_head_idx == data->trace_tail_idx) |
| 1185 | data->trace_idx = 0; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1186 | |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1187 | ent = trace_entry_idx(iter->tr, iter->tr->data[iter->cpu], |
| 1188 | iter, iter->cpu); |
| 1189 | if (ent && ent->type == TRACE_CONT) |
| 1190 | goto again; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1191 | } |
| 1192 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1193 | static void *s_next(struct seq_file *m, void *v, loff_t *pos) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1194 | { |
| 1195 | struct trace_iterator *iter = m->private; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1196 | int i = (int)*pos; |
Ingo Molnar | 4e3c333 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 1197 | void *ent; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1198 | |
| 1199 | (*pos)++; |
| 1200 | |
| 1201 | /* can't go backwards */ |
| 1202 | if (iter->idx > i) |
| 1203 | return NULL; |
| 1204 | |
| 1205 | if (iter->idx < 0) |
| 1206 | ent = find_next_entry_inc(iter); |
| 1207 | else |
| 1208 | ent = iter; |
| 1209 | |
| 1210 | while (ent && iter->idx < i) |
| 1211 | ent = find_next_entry_inc(iter); |
| 1212 | |
| 1213 | iter->pos = *pos; |
| 1214 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1215 | return ent; |
| 1216 | } |
| 1217 | |
| 1218 | static void *s_start(struct seq_file *m, loff_t *pos) |
| 1219 | { |
| 1220 | struct trace_iterator *iter = m->private; |
| 1221 | void *p = NULL; |
| 1222 | loff_t l = 0; |
| 1223 | int i; |
| 1224 | |
| 1225 | mutex_lock(&trace_types_lock); |
| 1226 | |
Steven Rostedt | d15f57f | 2008-05-12 21:20:56 +0200 | [diff] [blame] | 1227 | if (!current_trace || current_trace != iter->trace) { |
| 1228 | mutex_unlock(&trace_types_lock); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1229 | return NULL; |
Steven Rostedt | d15f57f | 2008-05-12 21:20:56 +0200 | [diff] [blame] | 1230 | } |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1231 | |
| 1232 | atomic_inc(&trace_record_cmdline_disabled); |
| 1233 | |
| 1234 | /* let the tracer grab locks here if needed */ |
| 1235 | if (current_trace->start) |
| 1236 | current_trace->start(iter); |
| 1237 | |
| 1238 | if (*pos != iter->pos) { |
| 1239 | iter->ent = NULL; |
| 1240 | iter->cpu = 0; |
| 1241 | iter->idx = -1; |
Ingo Molnar | 4e3c333 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 1242 | iter->prev_ent = NULL; |
| 1243 | iter->prev_cpu = -1; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1244 | |
Steven Rostedt | ab46428 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 1245 | for_each_tracing_cpu(i) { |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1246 | iter->next_idx[i] = 0; |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1247 | iter->next_page[i] = NULL; |
| 1248 | } |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1249 | |
| 1250 | for (p = iter; p && l < *pos; p = s_next(m, p, &l)) |
| 1251 | ; |
| 1252 | |
| 1253 | } else { |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1254 | l = *pos - 1; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1255 | p = s_next(m, p, &l); |
| 1256 | } |
| 1257 | |
| 1258 | return p; |
| 1259 | } |
| 1260 | |
| 1261 | static void s_stop(struct seq_file *m, void *p) |
| 1262 | { |
| 1263 | struct trace_iterator *iter = m->private; |
| 1264 | |
| 1265 | atomic_dec(&trace_record_cmdline_disabled); |
| 1266 | |
| 1267 | /* let the tracer release locks here if needed */ |
| 1268 | if (current_trace && current_trace == iter->trace && iter->trace->stop) |
| 1269 | iter->trace->stop(iter); |
| 1270 | |
| 1271 | mutex_unlock(&trace_types_lock); |
| 1272 | } |
| 1273 | |
Abhishek Sagar | 76094a2 | 2008-05-28 00:03:18 +0530 | [diff] [blame] | 1274 | #define KRETPROBE_MSG "[unknown/kretprobe'd]" |
| 1275 | |
| 1276 | #ifdef CONFIG_KRETPROBES |
| 1277 | static inline int kretprobed(unsigned long addr) |
| 1278 | { |
| 1279 | return addr == (unsigned long)kretprobe_trampoline; |
| 1280 | } |
| 1281 | #else |
| 1282 | static inline int kretprobed(unsigned long addr) |
| 1283 | { |
| 1284 | return 0; |
| 1285 | } |
| 1286 | #endif /* CONFIG_KRETPROBES */ |
| 1287 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1288 | static int |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1289 | seq_print_sym_short(struct trace_seq *s, const char *fmt, unsigned long address) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1290 | { |
| 1291 | #ifdef CONFIG_KALLSYMS |
| 1292 | char str[KSYM_SYMBOL_LEN]; |
| 1293 | |
| 1294 | kallsyms_lookup(address, NULL, NULL, NULL, str); |
| 1295 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1296 | return trace_seq_printf(s, fmt, str); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1297 | #endif |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1298 | return 1; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1299 | } |
| 1300 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1301 | static int |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1302 | seq_print_sym_offset(struct trace_seq *s, const char *fmt, |
| 1303 | unsigned long address) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1304 | { |
| 1305 | #ifdef CONFIG_KALLSYMS |
| 1306 | char str[KSYM_SYMBOL_LEN]; |
| 1307 | |
| 1308 | sprint_symbol(str, address); |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1309 | return trace_seq_printf(s, fmt, str); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1310 | #endif |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1311 | return 1; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1312 | } |
| 1313 | |
| 1314 | #ifndef CONFIG_64BIT |
| 1315 | # define IP_FMT "%08lx" |
| 1316 | #else |
| 1317 | # define IP_FMT "%016lx" |
| 1318 | #endif |
| 1319 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1320 | static int |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1321 | seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1322 | { |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1323 | int ret; |
| 1324 | |
| 1325 | if (!ip) |
| 1326 | return trace_seq_printf(s, "0"); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1327 | |
| 1328 | if (sym_flags & TRACE_ITER_SYM_OFFSET) |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1329 | ret = seq_print_sym_offset(s, "%s", ip); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1330 | else |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1331 | ret = seq_print_sym_short(s, "%s", ip); |
| 1332 | |
| 1333 | if (!ret) |
| 1334 | return 0; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1335 | |
| 1336 | if (sym_flags & TRACE_ITER_SYM_ADDR) |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1337 | ret = trace_seq_printf(s, " <" IP_FMT ">", ip); |
| 1338 | return ret; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1339 | } |
| 1340 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1341 | static void print_lat_help_header(struct seq_file *m) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1342 | { |
Michael Ellerman | a616835 | 2008-08-20 16:36:11 -0700 | [diff] [blame] | 1343 | seq_puts(m, "# _------=> CPU# \n"); |
| 1344 | seq_puts(m, "# / _-----=> irqs-off \n"); |
| 1345 | seq_puts(m, "# | / _----=> need-resched \n"); |
| 1346 | seq_puts(m, "# || / _---=> hardirq/softirq \n"); |
| 1347 | seq_puts(m, "# ||| / _--=> preempt-depth \n"); |
| 1348 | seq_puts(m, "# |||| / \n"); |
| 1349 | seq_puts(m, "# ||||| delay \n"); |
| 1350 | seq_puts(m, "# cmd pid ||||| time | caller \n"); |
| 1351 | seq_puts(m, "# \\ / ||||| \\ | / \n"); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1352 | } |
| 1353 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1354 | static void print_func_help_header(struct seq_file *m) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1355 | { |
Michael Ellerman | a616835 | 2008-08-20 16:36:11 -0700 | [diff] [blame] | 1356 | seq_puts(m, "# TASK-PID CPU# TIMESTAMP FUNCTION\n"); |
| 1357 | seq_puts(m, "# | | | | |\n"); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1358 | } |
| 1359 | |
| 1360 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1361 | static void |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1362 | print_trace_header(struct seq_file *m, struct trace_iterator *iter) |
| 1363 | { |
| 1364 | unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK); |
| 1365 | struct trace_array *tr = iter->tr; |
| 1366 | struct trace_array_cpu *data = tr->data[tr->cpu]; |
| 1367 | struct tracer *type = current_trace; |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1368 | unsigned long total = 0; |
| 1369 | unsigned long entries = 0; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1370 | int cpu; |
| 1371 | const char *name = "preemption"; |
| 1372 | |
| 1373 | if (type) |
| 1374 | name = type->name; |
| 1375 | |
Steven Rostedt | ab46428 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 1376 | for_each_tracing_cpu(cpu) { |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 1377 | if (head_page(tr->data[cpu])) { |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1378 | total += tr->data[cpu]->trace_idx; |
| 1379 | if (tr->data[cpu]->trace_idx > tr->entries) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1380 | entries += tr->entries; |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1381 | else |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1382 | entries += tr->data[cpu]->trace_idx; |
| 1383 | } |
| 1384 | } |
| 1385 | |
| 1386 | seq_printf(m, "%s latency trace v1.1.5 on %s\n", |
| 1387 | name, UTS_RELEASE); |
| 1388 | seq_puts(m, "-----------------------------------" |
| 1389 | "---------------------------------\n"); |
| 1390 | seq_printf(m, " latency: %lu us, #%lu/%lu, CPU#%d |" |
| 1391 | " (M:%s VP:%d, KP:%d, SP:%d HP:%d", |
Steven Rostedt | 57f50be | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 1392 | nsecs_to_usecs(data->saved_latency), |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1393 | entries, |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1394 | total, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1395 | tr->cpu, |
| 1396 | #if defined(CONFIG_PREEMPT_NONE) |
| 1397 | "server", |
| 1398 | #elif defined(CONFIG_PREEMPT_VOLUNTARY) |
| 1399 | "desktop", |
Steven Rostedt | b5c21b4 | 2008-07-10 20:58:12 -0400 | [diff] [blame] | 1400 | #elif defined(CONFIG_PREEMPT) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1401 | "preempt", |
| 1402 | #else |
| 1403 | "unknown", |
| 1404 | #endif |
| 1405 | /* These are reserved for later use */ |
| 1406 | 0, 0, 0, 0); |
| 1407 | #ifdef CONFIG_SMP |
| 1408 | seq_printf(m, " #P:%d)\n", num_online_cpus()); |
| 1409 | #else |
| 1410 | seq_puts(m, ")\n"); |
| 1411 | #endif |
| 1412 | seq_puts(m, " -----------------\n"); |
| 1413 | seq_printf(m, " | task: %.16s-%d " |
| 1414 | "(uid:%d nice:%ld policy:%ld rt_prio:%ld)\n", |
| 1415 | data->comm, data->pid, data->uid, data->nice, |
| 1416 | data->policy, data->rt_priority); |
| 1417 | seq_puts(m, " -----------------\n"); |
| 1418 | |
| 1419 | if (data->critical_start) { |
| 1420 | seq_puts(m, " => started at: "); |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1421 | seq_print_ip_sym(&iter->seq, data->critical_start, sym_flags); |
| 1422 | trace_print_seq(m, &iter->seq); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1423 | seq_puts(m, "\n => ended at: "); |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1424 | seq_print_ip_sym(&iter->seq, data->critical_end, sym_flags); |
| 1425 | trace_print_seq(m, &iter->seq); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1426 | seq_puts(m, "\n"); |
| 1427 | } |
| 1428 | |
| 1429 | seq_puts(m, "\n"); |
| 1430 | } |
| 1431 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1432 | static void |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1433 | lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1434 | { |
Steven Rostedt | 2e2ca15 | 2008-08-01 12:26:40 -0400 | [diff] [blame] | 1435 | struct trace_field *field = &entry->field; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1436 | int hardirq, softirq; |
| 1437 | char *comm; |
| 1438 | |
Steven Rostedt | 2e2ca15 | 2008-08-01 12:26:40 -0400 | [diff] [blame] | 1439 | comm = trace_find_cmdline(field->pid); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1440 | |
Steven Rostedt | 2e2ca15 | 2008-08-01 12:26:40 -0400 | [diff] [blame] | 1441 | trace_seq_printf(s, "%8.8s-%-5d ", comm, field->pid); |
Michael Ellerman | a616835 | 2008-08-20 16:36:11 -0700 | [diff] [blame] | 1442 | trace_seq_printf(s, "%3d", cpu); |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1443 | trace_seq_printf(s, "%c%c", |
Steven Rostedt | 2e2ca15 | 2008-08-01 12:26:40 -0400 | [diff] [blame] | 1444 | (field->flags & TRACE_FLAG_IRQS_OFF) ? 'd' : '.', |
| 1445 | ((field->flags & TRACE_FLAG_NEED_RESCHED) ? 'N' : '.')); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1446 | |
Steven Rostedt | 2e2ca15 | 2008-08-01 12:26:40 -0400 | [diff] [blame] | 1447 | hardirq = field->flags & TRACE_FLAG_HARDIRQ; |
| 1448 | softirq = field->flags & TRACE_FLAG_SOFTIRQ; |
Ingo Molnar | afc2abc | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 1449 | if (hardirq && softirq) { |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1450 | trace_seq_putc(s, 'H'); |
Ingo Molnar | afc2abc | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 1451 | } else { |
| 1452 | if (hardirq) { |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1453 | trace_seq_putc(s, 'h'); |
Ingo Molnar | afc2abc | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 1454 | } else { |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1455 | if (softirq) |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1456 | trace_seq_putc(s, 's'); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1457 | else |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1458 | trace_seq_putc(s, '.'); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1459 | } |
| 1460 | } |
| 1461 | |
Steven Rostedt | 2e2ca15 | 2008-08-01 12:26:40 -0400 | [diff] [blame] | 1462 | if (field->preempt_count) |
| 1463 | trace_seq_printf(s, "%x", field->preempt_count); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1464 | else |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1465 | trace_seq_puts(s, "."); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1466 | } |
| 1467 | |
| 1468 | unsigned long preempt_mark_thresh = 100; |
| 1469 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1470 | static void |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1471 | lat_print_timestamp(struct trace_seq *s, unsigned long long abs_usecs, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1472 | unsigned long rel_usecs) |
| 1473 | { |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1474 | trace_seq_printf(s, " %4lldus", abs_usecs); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1475 | if (rel_usecs > preempt_mark_thresh) |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1476 | trace_seq_puts(s, "!: "); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1477 | else if (rel_usecs > 1) |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1478 | trace_seq_puts(s, "+: "); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1479 | else |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1480 | trace_seq_puts(s, " : "); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1481 | } |
| 1482 | |
| 1483 | static const char state_to_char[] = TASK_STATE_TO_CHAR_STR; |
| 1484 | |
Pekka Paalanen | fc5e27a | 2008-09-16 22:02:27 +0300 | [diff] [blame] | 1485 | /* |
| 1486 | * The message is supposed to contain an ending newline. |
| 1487 | * If the printing stops prematurely, try to add a newline of our own. |
| 1488 | */ |
| 1489 | void trace_seq_print_cont(struct trace_seq *s, struct trace_iterator *iter) |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1490 | { |
| 1491 | struct trace_array *tr = iter->tr; |
| 1492 | struct trace_array_cpu *data = tr->data[iter->cpu]; |
| 1493 | struct trace_entry *ent; |
Pekka Paalanen | fc5e27a | 2008-09-16 22:02:27 +0300 | [diff] [blame] | 1494 | bool ok = true; |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1495 | |
| 1496 | ent = trace_entry_idx(tr, data, iter, iter->cpu); |
| 1497 | if (!ent || ent->type != TRACE_CONT) { |
| 1498 | trace_seq_putc(s, '\n'); |
| 1499 | return; |
| 1500 | } |
| 1501 | |
| 1502 | do { |
Pekka Paalanen | fc5e27a | 2008-09-16 22:02:27 +0300 | [diff] [blame] | 1503 | if (ok) |
| 1504 | ok = (trace_seq_printf(s, "%s", ent->cont.buf) > 0); |
Steven Rostedt | 5a90f57 | 2008-09-03 17:42:51 -0400 | [diff] [blame] | 1505 | __trace_iterator_increment(iter, iter->cpu); |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1506 | ent = trace_entry_idx(tr, data, iter, iter->cpu); |
| 1507 | } while (ent && ent->type == TRACE_CONT); |
Pekka Paalanen | fc5e27a | 2008-09-16 22:02:27 +0300 | [diff] [blame] | 1508 | |
| 1509 | if (!ok) |
| 1510 | trace_seq_putc(s, '\n'); |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1511 | } |
| 1512 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1513 | static int |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1514 | print_lat_fmt(struct trace_iterator *iter, unsigned int trace_idx, int cpu) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1515 | { |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1516 | struct trace_seq *s = &iter->seq; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1517 | unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK); |
| 1518 | struct trace_entry *next_entry = find_next_entry(iter, NULL); |
| 1519 | unsigned long verbose = (trace_flags & TRACE_ITER_VERBOSE); |
| 1520 | struct trace_entry *entry = iter->ent; |
Steven Rostedt | 2e2ca15 | 2008-08-01 12:26:40 -0400 | [diff] [blame] | 1521 | struct trace_field *field = &entry->field; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1522 | unsigned long abs_usecs; |
| 1523 | unsigned long rel_usecs; |
| 1524 | char *comm; |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1525 | int S, T; |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1526 | int i; |
Ankita Garg | d17d969 | 2008-05-12 21:20:58 +0200 | [diff] [blame] | 1527 | unsigned state; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1528 | |
| 1529 | if (!next_entry) |
| 1530 | next_entry = entry; |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1531 | |
| 1532 | if (entry->type == TRACE_CONT) |
| 1533 | return 1; |
| 1534 | |
Steven Rostedt | 2e2ca15 | 2008-08-01 12:26:40 -0400 | [diff] [blame] | 1535 | rel_usecs = ns2usecs(next_entry->field.t - entry->field.t); |
| 1536 | abs_usecs = ns2usecs(entry->field.t - iter->tr->time_start); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1537 | |
| 1538 | if (verbose) { |
Steven Rostedt | 2e2ca15 | 2008-08-01 12:26:40 -0400 | [diff] [blame] | 1539 | comm = trace_find_cmdline(field->pid); |
Michael Ellerman | a616835 | 2008-08-20 16:36:11 -0700 | [diff] [blame] | 1540 | trace_seq_printf(s, "%16s %5d %3d %d %08x %08x [%08lx]" |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1541 | " %ld.%03ldms (+%ld.%03ldms): ", |
| 1542 | comm, |
Steven Rostedt | 2e2ca15 | 2008-08-01 12:26:40 -0400 | [diff] [blame] | 1543 | field->pid, cpu, field->flags, |
| 1544 | field->preempt_count, trace_idx, |
| 1545 | ns2usecs(field->t), |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1546 | abs_usecs/1000, |
| 1547 | abs_usecs % 1000, rel_usecs/1000, |
| 1548 | rel_usecs % 1000); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1549 | } else { |
Ingo Molnar | f29c73f | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1550 | lat_print_generic(s, entry, cpu); |
| 1551 | lat_print_timestamp(s, abs_usecs, rel_usecs); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1552 | } |
| 1553 | switch (entry->type) { |
| 1554 | case TRACE_FN: |
Steven Rostedt | 2e2ca15 | 2008-08-01 12:26:40 -0400 | [diff] [blame] | 1555 | seq_print_ip_sym(s, field->fn.ip, sym_flags); |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1556 | trace_seq_puts(s, " ("); |
Steven Rostedt | 2e2ca15 | 2008-08-01 12:26:40 -0400 | [diff] [blame] | 1557 | if (kretprobed(field->fn.parent_ip)) |
Abhishek Sagar | 76094a2 | 2008-05-28 00:03:18 +0530 | [diff] [blame] | 1558 | trace_seq_puts(s, KRETPROBE_MSG); |
| 1559 | else |
Steven Rostedt | 2e2ca15 | 2008-08-01 12:26:40 -0400 | [diff] [blame] | 1560 | seq_print_ip_sym(s, field->fn.parent_ip, sym_flags); |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1561 | trace_seq_puts(s, ")\n"); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1562 | break; |
| 1563 | case TRACE_CTX: |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1564 | case TRACE_WAKE: |
Steven Rostedt | 2e2ca15 | 2008-08-01 12:26:40 -0400 | [diff] [blame] | 1565 | T = field->ctx.next_state < sizeof(state_to_char) ? |
| 1566 | state_to_char[field->ctx.next_state] : 'X'; |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1567 | |
Steven Rostedt | 2e2ca15 | 2008-08-01 12:26:40 -0400 | [diff] [blame] | 1568 | state = field->ctx.prev_state ? |
| 1569 | __ffs(field->ctx.prev_state) + 1 : 0; |
Ankita Garg | d17d969 | 2008-05-12 21:20:58 +0200 | [diff] [blame] | 1570 | S = state < sizeof(state_to_char) - 1 ? state_to_char[state] : 'X'; |
Steven Rostedt | 2e2ca15 | 2008-08-01 12:26:40 -0400 | [diff] [blame] | 1571 | comm = trace_find_cmdline(field->ctx.next_pid); |
Peter Zijlstra | 80b5e94 | 2008-09-04 10:24:16 +0200 | [diff] [blame] | 1572 | trace_seq_printf(s, " %5d:%3d:%c %s [%03d] %5d:%3d:%c %s\n", |
Steven Rostedt | 2e2ca15 | 2008-08-01 12:26:40 -0400 | [diff] [blame] | 1573 | field->ctx.prev_pid, |
| 1574 | field->ctx.prev_prio, |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1575 | S, entry->type == TRACE_CTX ? "==>" : " +", |
Peter Zijlstra | 80b5e94 | 2008-09-04 10:24:16 +0200 | [diff] [blame] | 1576 | field->ctx.next_cpu, |
Steven Rostedt | 2e2ca15 | 2008-08-01 12:26:40 -0400 | [diff] [blame] | 1577 | field->ctx.next_pid, |
| 1578 | field->ctx.next_prio, |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1579 | T, comm); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1580 | break; |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1581 | case TRACE_SPECIAL: |
Ingo Molnar | 88a4216 | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1582 | trace_seq_printf(s, "# %ld %ld %ld\n", |
Steven Rostedt | 2e2ca15 | 2008-08-01 12:26:40 -0400 | [diff] [blame] | 1583 | field->special.arg1, |
| 1584 | field->special.arg2, |
| 1585 | field->special.arg3); |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1586 | break; |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1587 | case TRACE_STACK: |
| 1588 | for (i = 0; i < FTRACE_STACK_ENTRIES; i++) { |
| 1589 | if (i) |
| 1590 | trace_seq_puts(s, " <= "); |
Steven Rostedt | 2e2ca15 | 2008-08-01 12:26:40 -0400 | [diff] [blame] | 1591 | seq_print_ip_sym(s, field->stack.caller[i], sym_flags); |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1592 | } |
| 1593 | trace_seq_puts(s, "\n"); |
| 1594 | break; |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1595 | case TRACE_PRINT: |
| 1596 | seq_print_ip_sym(s, field->print.ip, sym_flags); |
| 1597 | trace_seq_printf(s, ": %s", field->print.buf); |
Steven Rostedt | 652567a | 2008-09-03 17:42:50 -0400 | [diff] [blame] | 1598 | if (field->flags & TRACE_FLAG_CONT) |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1599 | trace_seq_print_cont(s, iter); |
| 1600 | break; |
Steven Rostedt | 89b2f97 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 1601 | default: |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1602 | trace_seq_printf(s, "Unknown type %d\n", entry->type); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1603 | } |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1604 | return 1; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1605 | } |
| 1606 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1607 | static int print_trace_fmt(struct trace_iterator *iter) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1608 | { |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1609 | struct trace_seq *s = &iter->seq; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1610 | unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK); |
Ingo Molnar | 4e3c333 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 1611 | struct trace_entry *entry; |
Steven Rostedt | 2e2ca15 | 2008-08-01 12:26:40 -0400 | [diff] [blame] | 1612 | struct trace_field *field; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1613 | unsigned long usec_rem; |
| 1614 | unsigned long long t; |
| 1615 | unsigned long secs; |
| 1616 | char *comm; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1617 | int ret; |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1618 | int S, T; |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1619 | int i; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1620 | |
Ingo Molnar | 4e3c333 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 1621 | entry = iter->ent; |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1622 | |
| 1623 | if (entry->type == TRACE_CONT) |
| 1624 | return 1; |
| 1625 | |
Steven Rostedt | 2e2ca15 | 2008-08-01 12:26:40 -0400 | [diff] [blame] | 1626 | field = &entry->field; |
Ingo Molnar | 4e3c333 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 1627 | |
Steven Rostedt | 2e2ca15 | 2008-08-01 12:26:40 -0400 | [diff] [blame] | 1628 | comm = trace_find_cmdline(iter->ent->field.pid); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1629 | |
Steven Rostedt | 2e2ca15 | 2008-08-01 12:26:40 -0400 | [diff] [blame] | 1630 | t = ns2usecs(field->t); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1631 | usec_rem = do_div(t, 1000000ULL); |
| 1632 | secs = (unsigned long)t; |
| 1633 | |
Steven Rostedt | 2e2ca15 | 2008-08-01 12:26:40 -0400 | [diff] [blame] | 1634 | ret = trace_seq_printf(s, "%16s-%-5d ", comm, field->pid); |
Ingo Molnar | f29c73f | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1635 | if (!ret) |
| 1636 | return 0; |
Michael Ellerman | a616835 | 2008-08-20 16:36:11 -0700 | [diff] [blame] | 1637 | ret = trace_seq_printf(s, "[%03d] ", iter->cpu); |
Ingo Molnar | f29c73f | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1638 | if (!ret) |
| 1639 | return 0; |
| 1640 | ret = trace_seq_printf(s, "%5lu.%06lu: ", secs, usec_rem); |
| 1641 | if (!ret) |
| 1642 | return 0; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1643 | |
| 1644 | switch (entry->type) { |
| 1645 | case TRACE_FN: |
Steven Rostedt | 2e2ca15 | 2008-08-01 12:26:40 -0400 | [diff] [blame] | 1646 | ret = seq_print_ip_sym(s, field->fn.ip, sym_flags); |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1647 | if (!ret) |
| 1648 | return 0; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1649 | if ((sym_flags & TRACE_ITER_PRINT_PARENT) && |
Steven Rostedt | 2e2ca15 | 2008-08-01 12:26:40 -0400 | [diff] [blame] | 1650 | field->fn.parent_ip) { |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1651 | ret = trace_seq_printf(s, " <-"); |
| 1652 | if (!ret) |
| 1653 | return 0; |
Steven Rostedt | 2e2ca15 | 2008-08-01 12:26:40 -0400 | [diff] [blame] | 1654 | if (kretprobed(field->fn.parent_ip)) |
Abhishek Sagar | 76094a2 | 2008-05-28 00:03:18 +0530 | [diff] [blame] | 1655 | ret = trace_seq_puts(s, KRETPROBE_MSG); |
| 1656 | else |
Steven Rostedt | 2e2ca15 | 2008-08-01 12:26:40 -0400 | [diff] [blame] | 1657 | ret = seq_print_ip_sym(s, |
| 1658 | field->fn.parent_ip, |
Abhishek Sagar | 76094a2 | 2008-05-28 00:03:18 +0530 | [diff] [blame] | 1659 | sym_flags); |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1660 | if (!ret) |
| 1661 | return 0; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1662 | } |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1663 | ret = trace_seq_printf(s, "\n"); |
| 1664 | if (!ret) |
| 1665 | return 0; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1666 | break; |
| 1667 | case TRACE_CTX: |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1668 | case TRACE_WAKE: |
Steven Rostedt | 2e2ca15 | 2008-08-01 12:26:40 -0400 | [diff] [blame] | 1669 | S = field->ctx.prev_state < sizeof(state_to_char) ? |
| 1670 | state_to_char[field->ctx.prev_state] : 'X'; |
| 1671 | T = field->ctx.next_state < sizeof(state_to_char) ? |
| 1672 | state_to_char[field->ctx.next_state] : 'X'; |
Peter Zijlstra | 80b5e94 | 2008-09-04 10:24:16 +0200 | [diff] [blame] | 1673 | ret = trace_seq_printf(s, " %5d:%3d:%c %s [%03d] %5d:%3d:%c\n", |
Steven Rostedt | 2e2ca15 | 2008-08-01 12:26:40 -0400 | [diff] [blame] | 1674 | field->ctx.prev_pid, |
| 1675 | field->ctx.prev_prio, |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1676 | S, |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1677 | entry->type == TRACE_CTX ? "==>" : " +", |
Peter Zijlstra | 80b5e94 | 2008-09-04 10:24:16 +0200 | [diff] [blame] | 1678 | field->ctx.next_cpu, |
Steven Rostedt | 2e2ca15 | 2008-08-01 12:26:40 -0400 | [diff] [blame] | 1679 | field->ctx.next_pid, |
| 1680 | field->ctx.next_prio, |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1681 | T); |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1682 | if (!ret) |
| 1683 | return 0; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1684 | break; |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1685 | case TRACE_SPECIAL: |
Ingo Molnar | 88a4216 | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1686 | ret = trace_seq_printf(s, "# %ld %ld %ld\n", |
Steven Rostedt | 2e2ca15 | 2008-08-01 12:26:40 -0400 | [diff] [blame] | 1687 | field->special.arg1, |
| 1688 | field->special.arg2, |
| 1689 | field->special.arg3); |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1690 | if (!ret) |
| 1691 | return 0; |
| 1692 | break; |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1693 | case TRACE_STACK: |
| 1694 | for (i = 0; i < FTRACE_STACK_ENTRIES; i++) { |
| 1695 | if (i) { |
| 1696 | ret = trace_seq_puts(s, " <= "); |
| 1697 | if (!ret) |
| 1698 | return 0; |
| 1699 | } |
Steven Rostedt | 2e2ca15 | 2008-08-01 12:26:40 -0400 | [diff] [blame] | 1700 | ret = seq_print_ip_sym(s, field->stack.caller[i], |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1701 | sym_flags); |
| 1702 | if (!ret) |
| 1703 | return 0; |
| 1704 | } |
| 1705 | ret = trace_seq_puts(s, "\n"); |
| 1706 | if (!ret) |
| 1707 | return 0; |
| 1708 | break; |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1709 | case TRACE_PRINT: |
| 1710 | seq_print_ip_sym(s, field->print.ip, sym_flags); |
| 1711 | trace_seq_printf(s, ": %s", field->print.buf); |
Steven Rostedt | 652567a | 2008-09-03 17:42:50 -0400 | [diff] [blame] | 1712 | if (field->flags & TRACE_FLAG_CONT) |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1713 | trace_seq_print_cont(s, iter); |
| 1714 | break; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1715 | } |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1716 | return 1; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1717 | } |
| 1718 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1719 | static int print_raw_fmt(struct trace_iterator *iter) |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1720 | { |
| 1721 | struct trace_seq *s = &iter->seq; |
| 1722 | struct trace_entry *entry; |
Steven Rostedt | 2e2ca15 | 2008-08-01 12:26:40 -0400 | [diff] [blame] | 1723 | struct trace_field *field; |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1724 | int ret; |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1725 | int S, T; |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1726 | |
| 1727 | entry = iter->ent; |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1728 | |
| 1729 | if (entry->type == TRACE_CONT) |
| 1730 | return 1; |
| 1731 | |
Steven Rostedt | 2e2ca15 | 2008-08-01 12:26:40 -0400 | [diff] [blame] | 1732 | field = &entry->field; |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1733 | |
| 1734 | ret = trace_seq_printf(s, "%d %d %llu ", |
Steven Rostedt | 2e2ca15 | 2008-08-01 12:26:40 -0400 | [diff] [blame] | 1735 | field->pid, iter->cpu, field->t); |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1736 | if (!ret) |
| 1737 | return 0; |
| 1738 | |
| 1739 | switch (entry->type) { |
| 1740 | case TRACE_FN: |
| 1741 | ret = trace_seq_printf(s, "%x %x\n", |
Steven Rostedt | 2e2ca15 | 2008-08-01 12:26:40 -0400 | [diff] [blame] | 1742 | field->fn.ip, |
| 1743 | field->fn.parent_ip); |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1744 | if (!ret) |
| 1745 | return 0; |
| 1746 | break; |
| 1747 | case TRACE_CTX: |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1748 | case TRACE_WAKE: |
Steven Rostedt | 2e2ca15 | 2008-08-01 12:26:40 -0400 | [diff] [blame] | 1749 | S = field->ctx.prev_state < sizeof(state_to_char) ? |
| 1750 | state_to_char[field->ctx.prev_state] : 'X'; |
| 1751 | T = field->ctx.next_state < sizeof(state_to_char) ? |
| 1752 | state_to_char[field->ctx.next_state] : 'X'; |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1753 | if (entry->type == TRACE_WAKE) |
| 1754 | S = '+'; |
Peter Zijlstra | 80b5e94 | 2008-09-04 10:24:16 +0200 | [diff] [blame] | 1755 | ret = trace_seq_printf(s, "%d %d %c %d %d %d %c\n", |
Steven Rostedt | 2e2ca15 | 2008-08-01 12:26:40 -0400 | [diff] [blame] | 1756 | field->ctx.prev_pid, |
| 1757 | field->ctx.prev_prio, |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1758 | S, |
Peter Zijlstra | 80b5e94 | 2008-09-04 10:24:16 +0200 | [diff] [blame] | 1759 | field->ctx.next_cpu, |
Steven Rostedt | 2e2ca15 | 2008-08-01 12:26:40 -0400 | [diff] [blame] | 1760 | field->ctx.next_pid, |
| 1761 | field->ctx.next_prio, |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1762 | T); |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1763 | if (!ret) |
| 1764 | return 0; |
| 1765 | break; |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1766 | case TRACE_SPECIAL: |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1767 | case TRACE_STACK: |
Ingo Molnar | 88a4216 | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1768 | ret = trace_seq_printf(s, "# %ld %ld %ld\n", |
Steven Rostedt | 2e2ca15 | 2008-08-01 12:26:40 -0400 | [diff] [blame] | 1769 | field->special.arg1, |
| 1770 | field->special.arg2, |
| 1771 | field->special.arg3); |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1772 | if (!ret) |
| 1773 | return 0; |
| 1774 | break; |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1775 | case TRACE_PRINT: |
| 1776 | trace_seq_printf(s, "# %lx %s", |
| 1777 | field->print.ip, field->print.buf); |
Steven Rostedt | 652567a | 2008-09-03 17:42:50 -0400 | [diff] [blame] | 1778 | if (field->flags & TRACE_FLAG_CONT) |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1779 | trace_seq_print_cont(s, iter); |
| 1780 | break; |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1781 | } |
| 1782 | return 1; |
| 1783 | } |
| 1784 | |
Ingo Molnar | cb0f12a | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1785 | #define SEQ_PUT_FIELD_RET(s, x) \ |
| 1786 | do { \ |
| 1787 | if (!trace_seq_putmem(s, &(x), sizeof(x))) \ |
| 1788 | return 0; \ |
| 1789 | } while (0) |
| 1790 | |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1791 | #define SEQ_PUT_HEX_FIELD_RET(s, x) \ |
| 1792 | do { \ |
| 1793 | if (!trace_seq_putmem_hex(s, &(x), sizeof(x))) \ |
| 1794 | return 0; \ |
| 1795 | } while (0) |
| 1796 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1797 | static int print_hex_fmt(struct trace_iterator *iter) |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1798 | { |
| 1799 | struct trace_seq *s = &iter->seq; |
| 1800 | unsigned char newline = '\n'; |
| 1801 | struct trace_entry *entry; |
Steven Rostedt | 2e2ca15 | 2008-08-01 12:26:40 -0400 | [diff] [blame] | 1802 | struct trace_field *field; |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1803 | int S, T; |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1804 | |
| 1805 | entry = iter->ent; |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1806 | |
| 1807 | if (entry->type == TRACE_CONT) |
| 1808 | return 1; |
| 1809 | |
Steven Rostedt | 2e2ca15 | 2008-08-01 12:26:40 -0400 | [diff] [blame] | 1810 | field = &entry->field; |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1811 | |
Steven Rostedt | 2e2ca15 | 2008-08-01 12:26:40 -0400 | [diff] [blame] | 1812 | SEQ_PUT_HEX_FIELD_RET(s, field->pid); |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1813 | SEQ_PUT_HEX_FIELD_RET(s, iter->cpu); |
Steven Rostedt | 2e2ca15 | 2008-08-01 12:26:40 -0400 | [diff] [blame] | 1814 | SEQ_PUT_HEX_FIELD_RET(s, field->t); |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1815 | |
| 1816 | switch (entry->type) { |
| 1817 | case TRACE_FN: |
Steven Rostedt | 2e2ca15 | 2008-08-01 12:26:40 -0400 | [diff] [blame] | 1818 | SEQ_PUT_HEX_FIELD_RET(s, field->fn.ip); |
| 1819 | SEQ_PUT_HEX_FIELD_RET(s, field->fn.parent_ip); |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1820 | break; |
| 1821 | case TRACE_CTX: |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1822 | case TRACE_WAKE: |
Steven Rostedt | 2e2ca15 | 2008-08-01 12:26:40 -0400 | [diff] [blame] | 1823 | S = field->ctx.prev_state < sizeof(state_to_char) ? |
| 1824 | state_to_char[field->ctx.prev_state] : 'X'; |
| 1825 | T = field->ctx.next_state < sizeof(state_to_char) ? |
| 1826 | state_to_char[field->ctx.next_state] : 'X'; |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1827 | if (entry->type == TRACE_WAKE) |
| 1828 | S = '+'; |
Steven Rostedt | 2e2ca15 | 2008-08-01 12:26:40 -0400 | [diff] [blame] | 1829 | SEQ_PUT_HEX_FIELD_RET(s, field->ctx.prev_pid); |
| 1830 | SEQ_PUT_HEX_FIELD_RET(s, field->ctx.prev_prio); |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1831 | SEQ_PUT_HEX_FIELD_RET(s, S); |
Peter Zijlstra | 80b5e94 | 2008-09-04 10:24:16 +0200 | [diff] [blame] | 1832 | SEQ_PUT_HEX_FIELD_RET(s, field->ctx.next_cpu); |
Steven Rostedt | 2e2ca15 | 2008-08-01 12:26:40 -0400 | [diff] [blame] | 1833 | SEQ_PUT_HEX_FIELD_RET(s, field->ctx.next_pid); |
| 1834 | SEQ_PUT_HEX_FIELD_RET(s, field->ctx.next_prio); |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1835 | SEQ_PUT_HEX_FIELD_RET(s, T); |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1836 | break; |
| 1837 | case TRACE_SPECIAL: |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1838 | case TRACE_STACK: |
Steven Rostedt | 2e2ca15 | 2008-08-01 12:26:40 -0400 | [diff] [blame] | 1839 | SEQ_PUT_HEX_FIELD_RET(s, field->special.arg1); |
| 1840 | SEQ_PUT_HEX_FIELD_RET(s, field->special.arg2); |
| 1841 | SEQ_PUT_HEX_FIELD_RET(s, field->special.arg3); |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1842 | break; |
| 1843 | } |
| 1844 | SEQ_PUT_FIELD_RET(s, newline); |
| 1845 | |
| 1846 | return 1; |
| 1847 | } |
| 1848 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1849 | static int print_bin_fmt(struct trace_iterator *iter) |
Ingo Molnar | cb0f12a | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1850 | { |
| 1851 | struct trace_seq *s = &iter->seq; |
| 1852 | struct trace_entry *entry; |
Steven Rostedt | 2e2ca15 | 2008-08-01 12:26:40 -0400 | [diff] [blame] | 1853 | struct trace_field *field; |
Ingo Molnar | cb0f12a | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1854 | |
| 1855 | entry = iter->ent; |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1856 | |
| 1857 | if (entry->type == TRACE_CONT) |
| 1858 | return 1; |
| 1859 | |
Steven Rostedt | 2e2ca15 | 2008-08-01 12:26:40 -0400 | [diff] [blame] | 1860 | field = &entry->field; |
Ingo Molnar | cb0f12a | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1861 | |
Steven Rostedt | 2e2ca15 | 2008-08-01 12:26:40 -0400 | [diff] [blame] | 1862 | SEQ_PUT_FIELD_RET(s, field->pid); |
| 1863 | SEQ_PUT_FIELD_RET(s, field->cpu); |
| 1864 | SEQ_PUT_FIELD_RET(s, field->t); |
Ingo Molnar | cb0f12a | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1865 | |
| 1866 | switch (entry->type) { |
| 1867 | case TRACE_FN: |
Steven Rostedt | 2e2ca15 | 2008-08-01 12:26:40 -0400 | [diff] [blame] | 1868 | SEQ_PUT_FIELD_RET(s, field->fn.ip); |
| 1869 | SEQ_PUT_FIELD_RET(s, field->fn.parent_ip); |
Ingo Molnar | cb0f12a | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1870 | break; |
| 1871 | case TRACE_CTX: |
Steven Rostedt | 2e2ca15 | 2008-08-01 12:26:40 -0400 | [diff] [blame] | 1872 | SEQ_PUT_FIELD_RET(s, field->ctx.prev_pid); |
| 1873 | SEQ_PUT_FIELD_RET(s, field->ctx.prev_prio); |
| 1874 | SEQ_PUT_FIELD_RET(s, field->ctx.prev_state); |
| 1875 | SEQ_PUT_FIELD_RET(s, field->ctx.next_pid); |
| 1876 | SEQ_PUT_FIELD_RET(s, field->ctx.next_prio); |
| 1877 | SEQ_PUT_FIELD_RET(s, field->ctx.next_state); |
Ingo Molnar | cb0f12a | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1878 | break; |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1879 | case TRACE_SPECIAL: |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1880 | case TRACE_STACK: |
Steven Rostedt | 2e2ca15 | 2008-08-01 12:26:40 -0400 | [diff] [blame] | 1881 | SEQ_PUT_FIELD_RET(s, field->special.arg1); |
| 1882 | SEQ_PUT_FIELD_RET(s, field->special.arg2); |
| 1883 | SEQ_PUT_FIELD_RET(s, field->special.arg3); |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1884 | break; |
Ingo Molnar | cb0f12a | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1885 | } |
| 1886 | return 1; |
| 1887 | } |
| 1888 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1889 | static int trace_empty(struct trace_iterator *iter) |
| 1890 | { |
| 1891 | struct trace_array_cpu *data; |
| 1892 | int cpu; |
| 1893 | |
Steven Rostedt | ab46428 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 1894 | for_each_tracing_cpu(cpu) { |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1895 | data = iter->tr->data[cpu]; |
| 1896 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1897 | if (head_page(data) && data->trace_idx && |
| 1898 | (data->trace_tail != data->trace_head || |
| 1899 | data->trace_tail_idx != data->trace_head_idx)) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1900 | return 0; |
| 1901 | } |
| 1902 | return 1; |
| 1903 | } |
| 1904 | |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1905 | static int print_trace_line(struct trace_iterator *iter) |
| 1906 | { |
Thomas Gleixner | 72829bc | 2008-05-23 21:37:28 +0200 | [diff] [blame] | 1907 | if (iter->trace && iter->trace->print_line) |
| 1908 | return iter->trace->print_line(iter); |
| 1909 | |
Ingo Molnar | cb0f12a | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1910 | if (trace_flags & TRACE_ITER_BIN) |
| 1911 | return print_bin_fmt(iter); |
| 1912 | |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1913 | if (trace_flags & TRACE_ITER_HEX) |
| 1914 | return print_hex_fmt(iter); |
| 1915 | |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1916 | if (trace_flags & TRACE_ITER_RAW) |
| 1917 | return print_raw_fmt(iter); |
| 1918 | |
| 1919 | if (iter->iter_flags & TRACE_FILE_LAT_FMT) |
| 1920 | return print_lat_fmt(iter, iter->idx, iter->cpu); |
| 1921 | |
| 1922 | return print_trace_fmt(iter); |
| 1923 | } |
| 1924 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1925 | static int s_show(struct seq_file *m, void *v) |
| 1926 | { |
| 1927 | struct trace_iterator *iter = v; |
| 1928 | |
| 1929 | if (iter->ent == NULL) { |
| 1930 | if (iter->tr) { |
| 1931 | seq_printf(m, "# tracer: %s\n", iter->trace->name); |
| 1932 | seq_puts(m, "#\n"); |
| 1933 | } |
| 1934 | if (iter->iter_flags & TRACE_FILE_LAT_FMT) { |
| 1935 | /* print nothing if the buffers are empty */ |
| 1936 | if (trace_empty(iter)) |
| 1937 | return 0; |
| 1938 | print_trace_header(m, iter); |
| 1939 | if (!(trace_flags & TRACE_ITER_VERBOSE)) |
| 1940 | print_lat_help_header(m); |
| 1941 | } else { |
| 1942 | if (!(trace_flags & TRACE_ITER_VERBOSE)) |
| 1943 | print_func_help_header(m); |
| 1944 | } |
| 1945 | } else { |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1946 | print_trace_line(iter); |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1947 | trace_print_seq(m, &iter->seq); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1948 | } |
| 1949 | |
| 1950 | return 0; |
| 1951 | } |
| 1952 | |
| 1953 | static struct seq_operations tracer_seq_ops = { |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1954 | .start = s_start, |
| 1955 | .next = s_next, |
| 1956 | .stop = s_stop, |
| 1957 | .show = s_show, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1958 | }; |
| 1959 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1960 | static struct trace_iterator * |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1961 | __tracing_open(struct inode *inode, struct file *file, int *ret) |
| 1962 | { |
| 1963 | struct trace_iterator *iter; |
| 1964 | |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 1965 | if (tracing_disabled) { |
| 1966 | *ret = -ENODEV; |
| 1967 | return NULL; |
| 1968 | } |
| 1969 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1970 | iter = kzalloc(sizeof(*iter), GFP_KERNEL); |
| 1971 | if (!iter) { |
| 1972 | *ret = -ENOMEM; |
| 1973 | goto out; |
| 1974 | } |
| 1975 | |
| 1976 | mutex_lock(&trace_types_lock); |
| 1977 | if (current_trace && current_trace->print_max) |
| 1978 | iter->tr = &max_tr; |
| 1979 | else |
| 1980 | iter->tr = inode->i_private; |
| 1981 | iter->trace = current_trace; |
| 1982 | iter->pos = -1; |
| 1983 | |
| 1984 | /* TODO stop tracer */ |
| 1985 | *ret = seq_open(file, &tracer_seq_ops); |
| 1986 | if (!*ret) { |
| 1987 | struct seq_file *m = file->private_data; |
| 1988 | m->private = iter; |
| 1989 | |
| 1990 | /* stop the trace while dumping */ |
Steven Rostedt | 60bc080 | 2008-07-10 20:58:16 -0400 | [diff] [blame] | 1991 | if (iter->tr->ctrl) { |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1992 | tracer_enabled = 0; |
Steven Rostedt | 60bc080 | 2008-07-10 20:58:16 -0400 | [diff] [blame] | 1993 | ftrace_function_enabled = 0; |
| 1994 | } |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1995 | |
| 1996 | if (iter->trace && iter->trace->open) |
| 1997 | iter->trace->open(iter); |
| 1998 | } else { |
| 1999 | kfree(iter); |
| 2000 | iter = NULL; |
| 2001 | } |
| 2002 | mutex_unlock(&trace_types_lock); |
| 2003 | |
| 2004 | out: |
| 2005 | return iter; |
| 2006 | } |
| 2007 | |
| 2008 | int tracing_open_generic(struct inode *inode, struct file *filp) |
| 2009 | { |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 2010 | if (tracing_disabled) |
| 2011 | return -ENODEV; |
| 2012 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2013 | filp->private_data = inode->i_private; |
| 2014 | return 0; |
| 2015 | } |
| 2016 | |
| 2017 | int tracing_release(struct inode *inode, struct file *file) |
| 2018 | { |
| 2019 | struct seq_file *m = (struct seq_file *)file->private_data; |
| 2020 | struct trace_iterator *iter = m->private; |
| 2021 | |
| 2022 | mutex_lock(&trace_types_lock); |
| 2023 | if (iter->trace && iter->trace->close) |
| 2024 | iter->trace->close(iter); |
| 2025 | |
| 2026 | /* reenable tracing if it was previously enabled */ |
Steven Rostedt | 60bc080 | 2008-07-10 20:58:16 -0400 | [diff] [blame] | 2027 | if (iter->tr->ctrl) { |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2028 | tracer_enabled = 1; |
Steven Rostedt | 60bc080 | 2008-07-10 20:58:16 -0400 | [diff] [blame] | 2029 | /* |
| 2030 | * It is safe to enable function tracing even if it |
| 2031 | * isn't used |
| 2032 | */ |
| 2033 | ftrace_function_enabled = 1; |
| 2034 | } |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2035 | mutex_unlock(&trace_types_lock); |
| 2036 | |
| 2037 | seq_release(inode, file); |
| 2038 | kfree(iter); |
| 2039 | return 0; |
| 2040 | } |
| 2041 | |
| 2042 | static int tracing_open(struct inode *inode, struct file *file) |
| 2043 | { |
| 2044 | int ret; |
| 2045 | |
| 2046 | __tracing_open(inode, file, &ret); |
| 2047 | |
| 2048 | return ret; |
| 2049 | } |
| 2050 | |
| 2051 | static int tracing_lt_open(struct inode *inode, struct file *file) |
| 2052 | { |
| 2053 | struct trace_iterator *iter; |
| 2054 | int ret; |
| 2055 | |
| 2056 | iter = __tracing_open(inode, file, &ret); |
| 2057 | |
| 2058 | if (!ret) |
| 2059 | iter->iter_flags |= TRACE_FILE_LAT_FMT; |
| 2060 | |
| 2061 | return ret; |
| 2062 | } |
| 2063 | |
| 2064 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 2065 | static void * |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2066 | t_next(struct seq_file *m, void *v, loff_t *pos) |
| 2067 | { |
| 2068 | struct tracer *t = m->private; |
| 2069 | |
| 2070 | (*pos)++; |
| 2071 | |
| 2072 | if (t) |
| 2073 | t = t->next; |
| 2074 | |
| 2075 | m->private = t; |
| 2076 | |
| 2077 | return t; |
| 2078 | } |
| 2079 | |
| 2080 | static void *t_start(struct seq_file *m, loff_t *pos) |
| 2081 | { |
| 2082 | struct tracer *t = m->private; |
| 2083 | loff_t l = 0; |
| 2084 | |
| 2085 | mutex_lock(&trace_types_lock); |
| 2086 | for (; t && l < *pos; t = t_next(m, t, &l)) |
| 2087 | ; |
| 2088 | |
| 2089 | return t; |
| 2090 | } |
| 2091 | |
| 2092 | static void t_stop(struct seq_file *m, void *p) |
| 2093 | { |
| 2094 | mutex_unlock(&trace_types_lock); |
| 2095 | } |
| 2096 | |
| 2097 | static int t_show(struct seq_file *m, void *v) |
| 2098 | { |
| 2099 | struct tracer *t = v; |
| 2100 | |
| 2101 | if (!t) |
| 2102 | return 0; |
| 2103 | |
| 2104 | seq_printf(m, "%s", t->name); |
| 2105 | if (t->next) |
| 2106 | seq_putc(m, ' '); |
| 2107 | else |
| 2108 | seq_putc(m, '\n'); |
| 2109 | |
| 2110 | return 0; |
| 2111 | } |
| 2112 | |
| 2113 | static struct seq_operations show_traces_seq_ops = { |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2114 | .start = t_start, |
| 2115 | .next = t_next, |
| 2116 | .stop = t_stop, |
| 2117 | .show = t_show, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2118 | }; |
| 2119 | |
| 2120 | static int show_traces_open(struct inode *inode, struct file *file) |
| 2121 | { |
| 2122 | int ret; |
| 2123 | |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 2124 | if (tracing_disabled) |
| 2125 | return -ENODEV; |
| 2126 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2127 | ret = seq_open(file, &show_traces_seq_ops); |
| 2128 | if (!ret) { |
| 2129 | struct seq_file *m = file->private_data; |
| 2130 | m->private = trace_types; |
| 2131 | } |
| 2132 | |
| 2133 | return ret; |
| 2134 | } |
| 2135 | |
| 2136 | static struct file_operations tracing_fops = { |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2137 | .open = tracing_open, |
| 2138 | .read = seq_read, |
| 2139 | .llseek = seq_lseek, |
| 2140 | .release = tracing_release, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2141 | }; |
| 2142 | |
| 2143 | static struct file_operations tracing_lt_fops = { |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2144 | .open = tracing_lt_open, |
| 2145 | .read = seq_read, |
| 2146 | .llseek = seq_lseek, |
| 2147 | .release = tracing_release, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2148 | }; |
| 2149 | |
| 2150 | static struct file_operations show_traces_fops = { |
Ingo Molnar | c7078de | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2151 | .open = show_traces_open, |
| 2152 | .read = seq_read, |
| 2153 | .release = seq_release, |
| 2154 | }; |
| 2155 | |
Ingo Molnar | 36dfe92 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2156 | /* |
| 2157 | * Only trace on a CPU if the bitmask is set: |
| 2158 | */ |
| 2159 | static cpumask_t tracing_cpumask = CPU_MASK_ALL; |
| 2160 | |
| 2161 | /* |
| 2162 | * When tracing/tracing_cpu_mask is modified then this holds |
| 2163 | * the new bitmask we are about to install: |
| 2164 | */ |
| 2165 | static cpumask_t tracing_cpumask_new; |
| 2166 | |
| 2167 | /* |
| 2168 | * The tracer itself will not take this lock, but still we want |
| 2169 | * to provide a consistent cpumask to user-space: |
| 2170 | */ |
| 2171 | static DEFINE_MUTEX(tracing_cpumask_update_lock); |
| 2172 | |
| 2173 | /* |
| 2174 | * Temporary storage for the character representation of the |
| 2175 | * CPU bitmask (and one more byte for the newline): |
| 2176 | */ |
| 2177 | static char mask_str[NR_CPUS + 1]; |
| 2178 | |
Ingo Molnar | c7078de | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2179 | static ssize_t |
| 2180 | tracing_cpumask_read(struct file *filp, char __user *ubuf, |
| 2181 | size_t count, loff_t *ppos) |
| 2182 | { |
Ingo Molnar | 36dfe92 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2183 | int len; |
Ingo Molnar | c7078de | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2184 | |
| 2185 | mutex_lock(&tracing_cpumask_update_lock); |
Ingo Molnar | 36dfe92 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2186 | |
| 2187 | len = cpumask_scnprintf(mask_str, count, tracing_cpumask); |
| 2188 | if (count - len < 2) { |
| 2189 | count = -EINVAL; |
| 2190 | goto out_err; |
| 2191 | } |
| 2192 | len += sprintf(mask_str + len, "\n"); |
| 2193 | count = simple_read_from_buffer(ubuf, count, ppos, mask_str, NR_CPUS+1); |
| 2194 | |
| 2195 | out_err: |
Ingo Molnar | c7078de | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2196 | mutex_unlock(&tracing_cpumask_update_lock); |
| 2197 | |
| 2198 | return count; |
| 2199 | } |
| 2200 | |
| 2201 | static ssize_t |
| 2202 | tracing_cpumask_write(struct file *filp, const char __user *ubuf, |
| 2203 | size_t count, loff_t *ppos) |
| 2204 | { |
Ingo Molnar | 36dfe92 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2205 | int err, cpu; |
Ingo Molnar | c7078de | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2206 | |
| 2207 | mutex_lock(&tracing_cpumask_update_lock); |
Ingo Molnar | 36dfe92 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2208 | err = cpumask_parse_user(ubuf, count, tracing_cpumask_new); |
| 2209 | if (err) |
| 2210 | goto err_unlock; |
| 2211 | |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 2212 | raw_local_irq_disable(); |
| 2213 | __raw_spin_lock(&ftrace_max_lock); |
Steven Rostedt | ab46428 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 2214 | for_each_tracing_cpu(cpu) { |
Ingo Molnar | 36dfe92 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2215 | /* |
| 2216 | * Increase/decrease the disabled counter if we are |
| 2217 | * about to flip a bit in the cpumask: |
| 2218 | */ |
| 2219 | if (cpu_isset(cpu, tracing_cpumask) && |
| 2220 | !cpu_isset(cpu, tracing_cpumask_new)) { |
| 2221 | atomic_inc(&global_trace.data[cpu]->disabled); |
| 2222 | } |
| 2223 | if (!cpu_isset(cpu, tracing_cpumask) && |
| 2224 | cpu_isset(cpu, tracing_cpumask_new)) { |
| 2225 | atomic_dec(&global_trace.data[cpu]->disabled); |
| 2226 | } |
| 2227 | } |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 2228 | __raw_spin_unlock(&ftrace_max_lock); |
| 2229 | raw_local_irq_enable(); |
Ingo Molnar | 36dfe92 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2230 | |
| 2231 | tracing_cpumask = tracing_cpumask_new; |
| 2232 | |
Ingo Molnar | c7078de | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2233 | mutex_unlock(&tracing_cpumask_update_lock); |
| 2234 | |
Ingo Molnar | c7078de | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2235 | return count; |
Ingo Molnar | 36dfe92 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2236 | |
| 2237 | err_unlock: |
| 2238 | mutex_unlock(&tracing_cpumask_update_lock); |
| 2239 | |
| 2240 | return err; |
Ingo Molnar | c7078de | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2241 | } |
| 2242 | |
| 2243 | static struct file_operations tracing_cpumask_fops = { |
| 2244 | .open = tracing_open_generic, |
| 2245 | .read = tracing_cpumask_read, |
| 2246 | .write = tracing_cpumask_write, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2247 | }; |
| 2248 | |
| 2249 | static ssize_t |
| 2250 | tracing_iter_ctrl_read(struct file *filp, char __user *ubuf, |
| 2251 | size_t cnt, loff_t *ppos) |
| 2252 | { |
| 2253 | char *buf; |
| 2254 | int r = 0; |
| 2255 | int len = 0; |
| 2256 | int i; |
| 2257 | |
| 2258 | /* calulate max size */ |
| 2259 | for (i = 0; trace_options[i]; i++) { |
| 2260 | len += strlen(trace_options[i]); |
| 2261 | len += 3; /* "no" and space */ |
| 2262 | } |
| 2263 | |
| 2264 | /* +2 for \n and \0 */ |
| 2265 | buf = kmalloc(len + 2, GFP_KERNEL); |
| 2266 | if (!buf) |
| 2267 | return -ENOMEM; |
| 2268 | |
| 2269 | for (i = 0; trace_options[i]; i++) { |
| 2270 | if (trace_flags & (1 << i)) |
| 2271 | r += sprintf(buf + r, "%s ", trace_options[i]); |
| 2272 | else |
| 2273 | r += sprintf(buf + r, "no%s ", trace_options[i]); |
| 2274 | } |
| 2275 | |
| 2276 | r += sprintf(buf + r, "\n"); |
| 2277 | WARN_ON(r >= len + 2); |
| 2278 | |
Ingo Molnar | 36dfe92 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2279 | r = simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2280 | |
| 2281 | kfree(buf); |
| 2282 | |
| 2283 | return r; |
| 2284 | } |
| 2285 | |
| 2286 | static ssize_t |
| 2287 | tracing_iter_ctrl_write(struct file *filp, const char __user *ubuf, |
| 2288 | size_t cnt, loff_t *ppos) |
| 2289 | { |
| 2290 | char buf[64]; |
| 2291 | char *cmp = buf; |
| 2292 | int neg = 0; |
| 2293 | int i; |
| 2294 | |
Steven Rostedt | cffae43 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 2295 | if (cnt >= sizeof(buf)) |
| 2296 | return -EINVAL; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2297 | |
| 2298 | if (copy_from_user(&buf, ubuf, cnt)) |
| 2299 | return -EFAULT; |
| 2300 | |
| 2301 | buf[cnt] = 0; |
| 2302 | |
| 2303 | if (strncmp(buf, "no", 2) == 0) { |
| 2304 | neg = 1; |
| 2305 | cmp += 2; |
| 2306 | } |
| 2307 | |
| 2308 | for (i = 0; trace_options[i]; i++) { |
| 2309 | int len = strlen(trace_options[i]); |
| 2310 | |
| 2311 | if (strncmp(cmp, trace_options[i], len) == 0) { |
| 2312 | if (neg) |
| 2313 | trace_flags &= ~(1 << i); |
| 2314 | else |
| 2315 | trace_flags |= (1 << i); |
| 2316 | break; |
| 2317 | } |
| 2318 | } |
Ingo Molnar | 442e544 | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 2319 | /* |
| 2320 | * If no option could be set, return an error: |
| 2321 | */ |
| 2322 | if (!trace_options[i]) |
| 2323 | return -EINVAL; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2324 | |
| 2325 | filp->f_pos += cnt; |
| 2326 | |
| 2327 | return cnt; |
| 2328 | } |
| 2329 | |
| 2330 | static struct file_operations tracing_iter_fops = { |
Ingo Molnar | c7078de | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2331 | .open = tracing_open_generic, |
| 2332 | .read = tracing_iter_ctrl_read, |
| 2333 | .write = tracing_iter_ctrl_write, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2334 | }; |
| 2335 | |
Ingo Molnar | 7bd2f24 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 2336 | static const char readme_msg[] = |
| 2337 | "tracing mini-HOWTO:\n\n" |
| 2338 | "# mkdir /debug\n" |
| 2339 | "# mount -t debugfs nodev /debug\n\n" |
| 2340 | "# cat /debug/tracing/available_tracers\n" |
| 2341 | "wakeup preemptirqsoff preemptoff irqsoff ftrace sched_switch none\n\n" |
| 2342 | "# cat /debug/tracing/current_tracer\n" |
| 2343 | "none\n" |
| 2344 | "# echo sched_switch > /debug/tracing/current_tracer\n" |
| 2345 | "# cat /debug/tracing/current_tracer\n" |
| 2346 | "sched_switch\n" |
| 2347 | "# cat /debug/tracing/iter_ctrl\n" |
| 2348 | "noprint-parent nosym-offset nosym-addr noverbose\n" |
| 2349 | "# echo print-parent > /debug/tracing/iter_ctrl\n" |
| 2350 | "# echo 1 > /debug/tracing/tracing_enabled\n" |
| 2351 | "# cat /debug/tracing/trace > /tmp/trace.txt\n" |
| 2352 | "echo 0 > /debug/tracing/tracing_enabled\n" |
| 2353 | ; |
| 2354 | |
| 2355 | static ssize_t |
| 2356 | tracing_readme_read(struct file *filp, char __user *ubuf, |
| 2357 | size_t cnt, loff_t *ppos) |
| 2358 | { |
| 2359 | return simple_read_from_buffer(ubuf, cnt, ppos, |
| 2360 | readme_msg, strlen(readme_msg)); |
| 2361 | } |
| 2362 | |
| 2363 | static struct file_operations tracing_readme_fops = { |
Ingo Molnar | c7078de | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2364 | .open = tracing_open_generic, |
| 2365 | .read = tracing_readme_read, |
Ingo Molnar | 7bd2f24 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 2366 | }; |
| 2367 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2368 | static ssize_t |
| 2369 | tracing_ctrl_read(struct file *filp, char __user *ubuf, |
| 2370 | size_t cnt, loff_t *ppos) |
| 2371 | { |
| 2372 | struct trace_array *tr = filp->private_data; |
| 2373 | char buf[64]; |
| 2374 | int r; |
| 2375 | |
| 2376 | r = sprintf(buf, "%ld\n", tr->ctrl); |
Ingo Molnar | 4e3c333 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 2377 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2378 | } |
| 2379 | |
| 2380 | static ssize_t |
| 2381 | tracing_ctrl_write(struct file *filp, const char __user *ubuf, |
| 2382 | size_t cnt, loff_t *ppos) |
| 2383 | { |
| 2384 | struct trace_array *tr = filp->private_data; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2385 | char buf[64]; |
Steven Rostedt | c6caeeb | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 2386 | long val; |
| 2387 | int ret; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2388 | |
Steven Rostedt | cffae43 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 2389 | if (cnt >= sizeof(buf)) |
| 2390 | return -EINVAL; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2391 | |
| 2392 | if (copy_from_user(&buf, ubuf, cnt)) |
| 2393 | return -EFAULT; |
| 2394 | |
| 2395 | buf[cnt] = 0; |
| 2396 | |
Steven Rostedt | c6caeeb | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 2397 | ret = strict_strtoul(buf, 10, &val); |
| 2398 | if (ret < 0) |
| 2399 | return ret; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2400 | |
| 2401 | val = !!val; |
| 2402 | |
| 2403 | mutex_lock(&trace_types_lock); |
| 2404 | if (tr->ctrl ^ val) { |
| 2405 | if (val) |
| 2406 | tracer_enabled = 1; |
| 2407 | else |
| 2408 | tracer_enabled = 0; |
| 2409 | |
| 2410 | tr->ctrl = val; |
| 2411 | |
| 2412 | if (current_trace && current_trace->ctrl_update) |
| 2413 | current_trace->ctrl_update(tr); |
| 2414 | } |
| 2415 | mutex_unlock(&trace_types_lock); |
| 2416 | |
| 2417 | filp->f_pos += cnt; |
| 2418 | |
| 2419 | return cnt; |
| 2420 | } |
| 2421 | |
| 2422 | static ssize_t |
| 2423 | tracing_set_trace_read(struct file *filp, char __user *ubuf, |
| 2424 | size_t cnt, loff_t *ppos) |
| 2425 | { |
| 2426 | char buf[max_tracer_type_len+2]; |
| 2427 | int r; |
| 2428 | |
| 2429 | mutex_lock(&trace_types_lock); |
| 2430 | if (current_trace) |
| 2431 | r = sprintf(buf, "%s\n", current_trace->name); |
| 2432 | else |
| 2433 | r = sprintf(buf, "\n"); |
| 2434 | mutex_unlock(&trace_types_lock); |
| 2435 | |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2436 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2437 | } |
| 2438 | |
| 2439 | static ssize_t |
| 2440 | tracing_set_trace_write(struct file *filp, const char __user *ubuf, |
| 2441 | size_t cnt, loff_t *ppos) |
| 2442 | { |
| 2443 | struct trace_array *tr = &global_trace; |
| 2444 | struct tracer *t; |
| 2445 | char buf[max_tracer_type_len+1]; |
| 2446 | int i; |
| 2447 | |
| 2448 | if (cnt > max_tracer_type_len) |
| 2449 | cnt = max_tracer_type_len; |
| 2450 | |
| 2451 | if (copy_from_user(&buf, ubuf, cnt)) |
| 2452 | return -EFAULT; |
| 2453 | |
| 2454 | buf[cnt] = 0; |
| 2455 | |
| 2456 | /* strip ending whitespace. */ |
| 2457 | for (i = cnt - 1; i > 0 && isspace(buf[i]); i--) |
| 2458 | buf[i] = 0; |
| 2459 | |
| 2460 | mutex_lock(&trace_types_lock); |
| 2461 | for (t = trace_types; t; t = t->next) { |
| 2462 | if (strcmp(t->name, buf) == 0) |
| 2463 | break; |
| 2464 | } |
| 2465 | if (!t || t == current_trace) |
| 2466 | goto out; |
| 2467 | |
| 2468 | if (current_trace && current_trace->reset) |
| 2469 | current_trace->reset(tr); |
| 2470 | |
| 2471 | current_trace = t; |
| 2472 | if (t->init) |
| 2473 | t->init(tr); |
| 2474 | |
| 2475 | out: |
| 2476 | mutex_unlock(&trace_types_lock); |
| 2477 | |
| 2478 | filp->f_pos += cnt; |
| 2479 | |
| 2480 | return cnt; |
| 2481 | } |
| 2482 | |
| 2483 | static ssize_t |
| 2484 | tracing_max_lat_read(struct file *filp, char __user *ubuf, |
| 2485 | size_t cnt, loff_t *ppos) |
| 2486 | { |
| 2487 | unsigned long *ptr = filp->private_data; |
| 2488 | char buf[64]; |
| 2489 | int r; |
| 2490 | |
Steven Rostedt | cffae43 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 2491 | r = snprintf(buf, sizeof(buf), "%ld\n", |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2492 | *ptr == (unsigned long)-1 ? -1 : nsecs_to_usecs(*ptr)); |
Steven Rostedt | cffae43 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 2493 | if (r > sizeof(buf)) |
| 2494 | r = sizeof(buf); |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2495 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2496 | } |
| 2497 | |
| 2498 | static ssize_t |
| 2499 | tracing_max_lat_write(struct file *filp, const char __user *ubuf, |
| 2500 | size_t cnt, loff_t *ppos) |
| 2501 | { |
| 2502 | long *ptr = filp->private_data; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2503 | char buf[64]; |
Steven Rostedt | c6caeeb | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 2504 | long val; |
| 2505 | int ret; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2506 | |
Steven Rostedt | cffae43 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 2507 | if (cnt >= sizeof(buf)) |
| 2508 | return -EINVAL; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2509 | |
| 2510 | if (copy_from_user(&buf, ubuf, cnt)) |
| 2511 | return -EFAULT; |
| 2512 | |
| 2513 | buf[cnt] = 0; |
| 2514 | |
Steven Rostedt | c6caeeb | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 2515 | ret = strict_strtoul(buf, 10, &val); |
| 2516 | if (ret < 0) |
| 2517 | return ret; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2518 | |
| 2519 | *ptr = val * 1000; |
| 2520 | |
| 2521 | return cnt; |
| 2522 | } |
| 2523 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2524 | static atomic_t tracing_reader; |
| 2525 | |
| 2526 | static int tracing_open_pipe(struct inode *inode, struct file *filp) |
| 2527 | { |
| 2528 | struct trace_iterator *iter; |
| 2529 | |
| 2530 | if (tracing_disabled) |
| 2531 | return -ENODEV; |
| 2532 | |
| 2533 | /* We only allow for reader of the pipe */ |
| 2534 | if (atomic_inc_return(&tracing_reader) != 1) { |
| 2535 | atomic_dec(&tracing_reader); |
| 2536 | return -EBUSY; |
| 2537 | } |
| 2538 | |
| 2539 | /* create a buffer to store the information to pass to userspace */ |
| 2540 | iter = kzalloc(sizeof(*iter), GFP_KERNEL); |
| 2541 | if (!iter) |
| 2542 | return -ENOMEM; |
| 2543 | |
Steven Rostedt | 107bad8 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2544 | mutex_lock(&trace_types_lock); |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2545 | iter->tr = &global_trace; |
Thomas Gleixner | 72829bc | 2008-05-23 21:37:28 +0200 | [diff] [blame] | 2546 | iter->trace = current_trace; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2547 | filp->private_data = iter; |
| 2548 | |
Steven Rostedt | 107bad8 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2549 | if (iter->trace->pipe_open) |
| 2550 | iter->trace->pipe_open(iter); |
| 2551 | mutex_unlock(&trace_types_lock); |
| 2552 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2553 | return 0; |
| 2554 | } |
| 2555 | |
| 2556 | static int tracing_release_pipe(struct inode *inode, struct file *file) |
| 2557 | { |
| 2558 | struct trace_iterator *iter = file->private_data; |
| 2559 | |
| 2560 | kfree(iter); |
| 2561 | atomic_dec(&tracing_reader); |
| 2562 | |
| 2563 | return 0; |
| 2564 | } |
| 2565 | |
Soeren Sandmann Pedersen | 2a2cc8f | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2566 | static unsigned int |
| 2567 | tracing_poll_pipe(struct file *filp, poll_table *poll_table) |
| 2568 | { |
| 2569 | struct trace_iterator *iter = filp->private_data; |
| 2570 | |
| 2571 | if (trace_flags & TRACE_ITER_BLOCK) { |
| 2572 | /* |
| 2573 | * Always select as readable when in blocking mode |
| 2574 | */ |
| 2575 | return POLLIN | POLLRDNORM; |
Ingo Molnar | afc2abc | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 2576 | } else { |
Soeren Sandmann Pedersen | 2a2cc8f | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2577 | if (!trace_empty(iter)) |
| 2578 | return POLLIN | POLLRDNORM; |
| 2579 | poll_wait(filp, &trace_wait, poll_table); |
| 2580 | if (!trace_empty(iter)) |
| 2581 | return POLLIN | POLLRDNORM; |
| 2582 | |
| 2583 | return 0; |
| 2584 | } |
| 2585 | } |
| 2586 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2587 | /* |
| 2588 | * Consumer reader. |
| 2589 | */ |
| 2590 | static ssize_t |
| 2591 | tracing_read_pipe(struct file *filp, char __user *ubuf, |
| 2592 | size_t cnt, loff_t *ppos) |
| 2593 | { |
| 2594 | struct trace_iterator *iter = filp->private_data; |
| 2595 | struct trace_array_cpu *data; |
| 2596 | static cpumask_t mask; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2597 | unsigned long flags; |
Ingo Molnar | 2577046 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2598 | #ifdef CONFIG_FTRACE |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2599 | int ftrace_save; |
Ingo Molnar | 2577046 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2600 | #endif |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2601 | int cpu; |
Pekka Paalanen | 6c6c279 | 2008-05-12 21:21:02 +0200 | [diff] [blame] | 2602 | ssize_t sret; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2603 | |
| 2604 | /* return any leftover data */ |
Pekka Paalanen | 6c6c279 | 2008-05-12 21:21:02 +0200 | [diff] [blame] | 2605 | sret = trace_seq_to_user(&iter->seq, ubuf, cnt); |
| 2606 | if (sret != -EBUSY) |
| 2607 | return sret; |
| 2608 | sret = 0; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2609 | |
Pekka Paalanen | 6c6c279 | 2008-05-12 21:21:02 +0200 | [diff] [blame] | 2610 | trace_seq_reset(&iter->seq); |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2611 | |
Steven Rostedt | 107bad8 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2612 | mutex_lock(&trace_types_lock); |
| 2613 | if (iter->trace->read) { |
Pekka Paalanen | 6c6c279 | 2008-05-12 21:21:02 +0200 | [diff] [blame] | 2614 | sret = iter->trace->read(iter, filp, ubuf, cnt, ppos); |
| 2615 | if (sret) |
Steven Rostedt | 107bad8 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2616 | goto out; |
Steven Rostedt | 107bad8 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2617 | } |
| 2618 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2619 | while (trace_empty(iter)) { |
Steven Rostedt | 2dc8f09 | 2008-05-12 21:20:58 +0200 | [diff] [blame] | 2620 | |
Steven Rostedt | 107bad8 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2621 | if ((filp->f_flags & O_NONBLOCK)) { |
Pekka Paalanen | 6c6c279 | 2008-05-12 21:21:02 +0200 | [diff] [blame] | 2622 | sret = -EAGAIN; |
Steven Rostedt | 107bad8 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2623 | goto out; |
| 2624 | } |
Steven Rostedt | 2dc8f09 | 2008-05-12 21:20:58 +0200 | [diff] [blame] | 2625 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2626 | /* |
| 2627 | * This is a make-shift waitqueue. The reason we don't use |
| 2628 | * an actual wait queue is because: |
| 2629 | * 1) we only ever have one waiter |
| 2630 | * 2) the tracing, traces all functions, we don't want |
| 2631 | * the overhead of calling wake_up and friends |
| 2632 | * (and tracing them too) |
| 2633 | * Anyway, this is really very primitive wakeup. |
| 2634 | */ |
| 2635 | set_current_state(TASK_INTERRUPTIBLE); |
| 2636 | iter->tr->waiter = current; |
| 2637 | |
Steven Rostedt | 107bad8 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2638 | mutex_unlock(&trace_types_lock); |
| 2639 | |
Ingo Molnar | 9fe068e | 2008-05-12 21:21:02 +0200 | [diff] [blame] | 2640 | /* sleep for 100 msecs, and try again. */ |
| 2641 | schedule_timeout(HZ/10); |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2642 | |
Steven Rostedt | 107bad8 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2643 | mutex_lock(&trace_types_lock); |
| 2644 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2645 | iter->tr->waiter = NULL; |
| 2646 | |
Steven Rostedt | 107bad8 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2647 | if (signal_pending(current)) { |
Pekka Paalanen | 6c6c279 | 2008-05-12 21:21:02 +0200 | [diff] [blame] | 2648 | sret = -EINTR; |
Steven Rostedt | 107bad8 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2649 | goto out; |
| 2650 | } |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2651 | |
Steven Rostedt | 8452799 | 2008-05-12 21:20:58 +0200 | [diff] [blame] | 2652 | if (iter->trace != current_trace) |
Steven Rostedt | 107bad8 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2653 | goto out; |
Steven Rostedt | 8452799 | 2008-05-12 21:20:58 +0200 | [diff] [blame] | 2654 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2655 | /* |
| 2656 | * We block until we read something and tracing is disabled. |
| 2657 | * We still block if tracing is disabled, but we have never |
| 2658 | * read anything. This allows a user to cat this file, and |
| 2659 | * then enable tracing. But after we have read something, |
| 2660 | * we give an EOF when tracing is again disabled. |
| 2661 | * |
| 2662 | * iter->pos will be 0 if we haven't read anything. |
| 2663 | */ |
| 2664 | if (!tracer_enabled && iter->pos) |
| 2665 | break; |
| 2666 | |
| 2667 | continue; |
| 2668 | } |
| 2669 | |
| 2670 | /* stop when tracing is finished */ |
| 2671 | if (trace_empty(iter)) |
Steven Rostedt | 107bad8 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2672 | goto out; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2673 | |
| 2674 | if (cnt >= PAGE_SIZE) |
| 2675 | cnt = PAGE_SIZE - 1; |
| 2676 | |
Steven Rostedt | 53d0aa7 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2677 | /* reset all but tr, trace, and overruns */ |
Steven Rostedt | 53d0aa7 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2678 | memset(&iter->seq, 0, |
| 2679 | sizeof(struct trace_iterator) - |
| 2680 | offsetof(struct trace_iterator, seq)); |
Steven Rostedt | 4823ed7 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2681 | iter->pos = -1; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2682 | |
| 2683 | /* |
| 2684 | * We need to stop all tracing on all CPUS to read the |
| 2685 | * the next buffer. This is a bit expensive, but is |
| 2686 | * not done often. We fill all what we can read, |
| 2687 | * and then release the locks again. |
| 2688 | */ |
| 2689 | |
| 2690 | cpus_clear(mask); |
| 2691 | local_irq_save(flags); |
Ingo Molnar | 2577046 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2692 | #ifdef CONFIG_FTRACE |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2693 | ftrace_save = ftrace_enabled; |
| 2694 | ftrace_enabled = 0; |
Ingo Molnar | 2577046 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2695 | #endif |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2696 | smp_wmb(); |
Steven Rostedt | ab46428 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 2697 | for_each_tracing_cpu(cpu) { |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2698 | data = iter->tr->data[cpu]; |
| 2699 | |
| 2700 | if (!head_page(data) || !data->trace_idx) |
| 2701 | continue; |
| 2702 | |
| 2703 | atomic_inc(&data->disabled); |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2704 | cpu_set(cpu, mask); |
| 2705 | } |
| 2706 | |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2707 | for_each_cpu_mask(cpu, mask) { |
| 2708 | data = iter->tr->data[cpu]; |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 2709 | __raw_spin_lock(&data->lock); |
Steven Rostedt | 53d0aa7 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2710 | |
| 2711 | if (data->overrun > iter->last_overrun[cpu]) |
| 2712 | iter->overrun[cpu] += |
| 2713 | data->overrun - iter->last_overrun[cpu]; |
| 2714 | iter->last_overrun[cpu] = data->overrun; |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2715 | } |
| 2716 | |
Steven Rostedt | 088b1e4 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 2717 | while (find_next_entry_inc(iter) != NULL) { |
Pekka Paalanen | 6c6c279 | 2008-05-12 21:21:02 +0200 | [diff] [blame] | 2718 | int ret; |
Steven Rostedt | 088b1e4 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 2719 | int len = iter->seq.len; |
| 2720 | |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 2721 | ret = print_trace_line(iter); |
Steven Rostedt | 088b1e4 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 2722 | if (!ret) { |
| 2723 | /* don't print partial lines */ |
| 2724 | iter->seq.len = len; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2725 | break; |
Steven Rostedt | 088b1e4 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 2726 | } |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2727 | |
| 2728 | trace_consume(iter); |
| 2729 | |
| 2730 | if (iter->seq.len >= cnt) |
| 2731 | break; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2732 | } |
| 2733 | |
Ingo Molnar | d4c5a2f | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2734 | for_each_cpu_mask(cpu, mask) { |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2735 | data = iter->tr->data[cpu]; |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 2736 | __raw_spin_unlock(&data->lock); |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2737 | } |
| 2738 | |
| 2739 | for_each_cpu_mask(cpu, mask) { |
| 2740 | data = iter->tr->data[cpu]; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2741 | atomic_dec(&data->disabled); |
| 2742 | } |
Ingo Molnar | 2577046 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2743 | #ifdef CONFIG_FTRACE |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2744 | ftrace_enabled = ftrace_save; |
Ingo Molnar | 2577046 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2745 | #endif |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2746 | local_irq_restore(flags); |
| 2747 | |
| 2748 | /* Now copy what we have to the user */ |
Pekka Paalanen | 6c6c279 | 2008-05-12 21:21:02 +0200 | [diff] [blame] | 2749 | sret = trace_seq_to_user(&iter->seq, ubuf, cnt); |
| 2750 | if (iter->seq.readpos >= iter->seq.len) |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2751 | trace_seq_reset(&iter->seq); |
Pekka Paalanen | 6c6c279 | 2008-05-12 21:21:02 +0200 | [diff] [blame] | 2752 | if (sret == -EBUSY) |
| 2753 | sret = 0; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2754 | |
Steven Rostedt | 107bad8 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2755 | out: |
| 2756 | mutex_unlock(&trace_types_lock); |
| 2757 | |
Pekka Paalanen | 6c6c279 | 2008-05-12 21:21:02 +0200 | [diff] [blame] | 2758 | return sret; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2759 | } |
| 2760 | |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 2761 | static ssize_t |
| 2762 | tracing_entries_read(struct file *filp, char __user *ubuf, |
| 2763 | size_t cnt, loff_t *ppos) |
| 2764 | { |
| 2765 | struct trace_array *tr = filp->private_data; |
| 2766 | char buf[64]; |
| 2767 | int r; |
| 2768 | |
| 2769 | r = sprintf(buf, "%lu\n", tr->entries); |
| 2770 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
| 2771 | } |
| 2772 | |
| 2773 | static ssize_t |
| 2774 | tracing_entries_write(struct file *filp, const char __user *ubuf, |
| 2775 | size_t cnt, loff_t *ppos) |
| 2776 | { |
| 2777 | unsigned long val; |
| 2778 | char buf[64]; |
Steven Rostedt | 19384c0 | 2008-05-22 00:22:16 -0400 | [diff] [blame] | 2779 | int i, ret; |
Frédéric Weisbecker | 43a1538 | 2008-09-21 20:16:30 +0200 | [diff] [blame] | 2780 | struct trace_array *tr = filp->private_data; |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 2781 | |
Steven Rostedt | cffae43 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 2782 | if (cnt >= sizeof(buf)) |
| 2783 | return -EINVAL; |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 2784 | |
| 2785 | if (copy_from_user(&buf, ubuf, cnt)) |
| 2786 | return -EFAULT; |
| 2787 | |
| 2788 | buf[cnt] = 0; |
| 2789 | |
Steven Rostedt | c6caeeb | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 2790 | ret = strict_strtoul(buf, 10, &val); |
| 2791 | if (ret < 0) |
| 2792 | return ret; |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 2793 | |
| 2794 | /* must have at least 1 entry */ |
| 2795 | if (!val) |
| 2796 | return -EINVAL; |
| 2797 | |
| 2798 | mutex_lock(&trace_types_lock); |
| 2799 | |
Frédéric Weisbecker | 43a1538 | 2008-09-21 20:16:30 +0200 | [diff] [blame] | 2800 | if (tr->ctrl) { |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 2801 | cnt = -EBUSY; |
Frédéric Weisbecker | 43a1538 | 2008-09-21 20:16:30 +0200 | [diff] [blame] | 2802 | pr_info("ftrace: please disable tracing" |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 2803 | " before modifying buffer size\n"); |
| 2804 | goto out; |
| 2805 | } |
| 2806 | |
| 2807 | if (val > global_trace.entries) { |
Steven Rostedt | 3eefae9 | 2008-05-12 21:21:04 +0200 | [diff] [blame] | 2808 | long pages_requested; |
| 2809 | unsigned long freeable_pages; |
| 2810 | |
| 2811 | /* make sure we have enough memory before mapping */ |
| 2812 | pages_requested = |
| 2813 | (val + (ENTRIES_PER_PAGE-1)) / ENTRIES_PER_PAGE; |
| 2814 | |
| 2815 | /* account for each buffer (and max_tr) */ |
| 2816 | pages_requested *= tracing_nr_buffers * 2; |
| 2817 | |
| 2818 | /* Check for overflow */ |
| 2819 | if (pages_requested < 0) { |
| 2820 | cnt = -ENOMEM; |
| 2821 | goto out; |
| 2822 | } |
| 2823 | |
| 2824 | freeable_pages = determine_dirtyable_memory(); |
| 2825 | |
| 2826 | /* we only allow to request 1/4 of useable memory */ |
| 2827 | if (pages_requested > |
| 2828 | ((freeable_pages + tracing_pages_allocated) / 4)) { |
| 2829 | cnt = -ENOMEM; |
| 2830 | goto out; |
| 2831 | } |
| 2832 | |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 2833 | while (global_trace.entries < val) { |
| 2834 | if (trace_alloc_page()) { |
| 2835 | cnt = -ENOMEM; |
| 2836 | goto out; |
| 2837 | } |
Steven Rostedt | 3eefae9 | 2008-05-12 21:21:04 +0200 | [diff] [blame] | 2838 | /* double check that we don't go over the known pages */ |
| 2839 | if (tracing_pages_allocated > pages_requested) |
| 2840 | break; |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 2841 | } |
Steven Rostedt | 3eefae9 | 2008-05-12 21:21:04 +0200 | [diff] [blame] | 2842 | |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 2843 | } else { |
| 2844 | /* include the number of entries in val (inc of page entries) */ |
| 2845 | while (global_trace.entries > val + (ENTRIES_PER_PAGE - 1)) |
| 2846 | trace_free_page(); |
| 2847 | } |
| 2848 | |
Steven Rostedt | 19384c0 | 2008-05-22 00:22:16 -0400 | [diff] [blame] | 2849 | /* check integrity */ |
| 2850 | for_each_tracing_cpu(i) |
| 2851 | check_pages(global_trace.data[i]); |
| 2852 | |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 2853 | filp->f_pos += cnt; |
| 2854 | |
Steven Rostedt | 19384c0 | 2008-05-22 00:22:16 -0400 | [diff] [blame] | 2855 | /* If check pages failed, return ENOMEM */ |
| 2856 | if (tracing_disabled) |
| 2857 | cnt = -ENOMEM; |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 2858 | out: |
| 2859 | max_tr.entries = global_trace.entries; |
| 2860 | mutex_unlock(&trace_types_lock); |
| 2861 | |
| 2862 | return cnt; |
| 2863 | } |
| 2864 | |
Pekka Paalanen | 5bf9a1e | 2008-09-16 22:06:42 +0300 | [diff] [blame] | 2865 | static int mark_printk(const char *fmt, ...) |
| 2866 | { |
| 2867 | int ret; |
| 2868 | va_list args; |
| 2869 | va_start(args, fmt); |
| 2870 | ret = trace_vprintk(0, fmt, args); |
| 2871 | va_end(args); |
| 2872 | return ret; |
| 2873 | } |
| 2874 | |
| 2875 | static ssize_t |
| 2876 | tracing_mark_write(struct file *filp, const char __user *ubuf, |
| 2877 | size_t cnt, loff_t *fpos) |
| 2878 | { |
| 2879 | char *buf; |
| 2880 | char *end; |
| 2881 | struct trace_array *tr = &global_trace; |
| 2882 | |
Frédéric Weisbecker | 43a1538 | 2008-09-21 20:16:30 +0200 | [diff] [blame] | 2883 | if (!tr->ctrl || tracing_disabled) |
Pekka Paalanen | 5bf9a1e | 2008-09-16 22:06:42 +0300 | [diff] [blame] | 2884 | return -EINVAL; |
| 2885 | |
| 2886 | if (cnt > TRACE_BUF_SIZE) |
| 2887 | cnt = TRACE_BUF_SIZE; |
| 2888 | |
| 2889 | buf = kmalloc(cnt + 1, GFP_KERNEL); |
| 2890 | if (buf == NULL) |
| 2891 | return -ENOMEM; |
| 2892 | |
| 2893 | if (copy_from_user(buf, ubuf, cnt)) { |
| 2894 | kfree(buf); |
| 2895 | return -EFAULT; |
| 2896 | } |
| 2897 | |
| 2898 | /* Cut from the first nil or newline. */ |
| 2899 | buf[cnt] = '\0'; |
| 2900 | end = strchr(buf, '\n'); |
| 2901 | if (end) |
| 2902 | *end = '\0'; |
| 2903 | |
| 2904 | cnt = mark_printk("%s\n", buf); |
| 2905 | kfree(buf); |
| 2906 | *fpos += cnt; |
| 2907 | |
| 2908 | return cnt; |
| 2909 | } |
| 2910 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2911 | static struct file_operations tracing_max_lat_fops = { |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2912 | .open = tracing_open_generic, |
| 2913 | .read = tracing_max_lat_read, |
| 2914 | .write = tracing_max_lat_write, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2915 | }; |
| 2916 | |
| 2917 | static struct file_operations tracing_ctrl_fops = { |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2918 | .open = tracing_open_generic, |
| 2919 | .read = tracing_ctrl_read, |
| 2920 | .write = tracing_ctrl_write, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2921 | }; |
| 2922 | |
| 2923 | static struct file_operations set_tracer_fops = { |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2924 | .open = tracing_open_generic, |
| 2925 | .read = tracing_set_trace_read, |
| 2926 | .write = tracing_set_trace_write, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2927 | }; |
| 2928 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2929 | static struct file_operations tracing_pipe_fops = { |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2930 | .open = tracing_open_pipe, |
Soeren Sandmann Pedersen | 2a2cc8f | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2931 | .poll = tracing_poll_pipe, |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2932 | .read = tracing_read_pipe, |
| 2933 | .release = tracing_release_pipe, |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2934 | }; |
| 2935 | |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 2936 | static struct file_operations tracing_entries_fops = { |
| 2937 | .open = tracing_open_generic, |
| 2938 | .read = tracing_entries_read, |
| 2939 | .write = tracing_entries_write, |
| 2940 | }; |
| 2941 | |
Pekka Paalanen | 5bf9a1e | 2008-09-16 22:06:42 +0300 | [diff] [blame] | 2942 | static struct file_operations tracing_mark_fops = { |
Frédéric Weisbecker | 43a1538 | 2008-09-21 20:16:30 +0200 | [diff] [blame] | 2943 | .open = tracing_open_generic, |
Pekka Paalanen | 5bf9a1e | 2008-09-16 22:06:42 +0300 | [diff] [blame] | 2944 | .write = tracing_mark_write, |
| 2945 | }; |
| 2946 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2947 | #ifdef CONFIG_DYNAMIC_FTRACE |
| 2948 | |
| 2949 | static ssize_t |
| 2950 | tracing_read_long(struct file *filp, char __user *ubuf, |
| 2951 | size_t cnt, loff_t *ppos) |
| 2952 | { |
| 2953 | unsigned long *p = filp->private_data; |
| 2954 | char buf[64]; |
| 2955 | int r; |
| 2956 | |
| 2957 | r = sprintf(buf, "%ld\n", *p); |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2958 | |
| 2959 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2960 | } |
| 2961 | |
| 2962 | static struct file_operations tracing_read_long_fops = { |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2963 | .open = tracing_open_generic, |
| 2964 | .read = tracing_read_long, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2965 | }; |
| 2966 | #endif |
| 2967 | |
| 2968 | static struct dentry *d_tracer; |
| 2969 | |
| 2970 | struct dentry *tracing_init_dentry(void) |
| 2971 | { |
| 2972 | static int once; |
| 2973 | |
| 2974 | if (d_tracer) |
| 2975 | return d_tracer; |
| 2976 | |
| 2977 | d_tracer = debugfs_create_dir("tracing", NULL); |
| 2978 | |
| 2979 | if (!d_tracer && !once) { |
| 2980 | once = 1; |
| 2981 | pr_warning("Could not create debugfs directory 'tracing'\n"); |
| 2982 | return NULL; |
| 2983 | } |
| 2984 | |
| 2985 | return d_tracer; |
| 2986 | } |
| 2987 | |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 2988 | #ifdef CONFIG_FTRACE_SELFTEST |
| 2989 | /* Let selftest have access to static functions in this file */ |
| 2990 | #include "trace_selftest.c" |
| 2991 | #endif |
| 2992 | |
Frédéric Weisbecker | b5ad384 | 2008-09-23 11:34:32 +0100 | [diff] [blame^] | 2993 | static __init int tracer_init_debugfs(void) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2994 | { |
| 2995 | struct dentry *d_tracer; |
| 2996 | struct dentry *entry; |
| 2997 | |
| 2998 | d_tracer = tracing_init_dentry(); |
| 2999 | |
| 3000 | entry = debugfs_create_file("tracing_enabled", 0644, d_tracer, |
| 3001 | &global_trace, &tracing_ctrl_fops); |
| 3002 | if (!entry) |
| 3003 | pr_warning("Could not create debugfs 'tracing_enabled' entry\n"); |
| 3004 | |
| 3005 | entry = debugfs_create_file("iter_ctrl", 0644, d_tracer, |
| 3006 | NULL, &tracing_iter_fops); |
| 3007 | if (!entry) |
| 3008 | pr_warning("Could not create debugfs 'iter_ctrl' entry\n"); |
| 3009 | |
Ingo Molnar | c7078de | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 3010 | entry = debugfs_create_file("tracing_cpumask", 0644, d_tracer, |
| 3011 | NULL, &tracing_cpumask_fops); |
| 3012 | if (!entry) |
| 3013 | pr_warning("Could not create debugfs 'tracing_cpumask' entry\n"); |
| 3014 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3015 | entry = debugfs_create_file("latency_trace", 0444, d_tracer, |
| 3016 | &global_trace, &tracing_lt_fops); |
| 3017 | if (!entry) |
| 3018 | pr_warning("Could not create debugfs 'latency_trace' entry\n"); |
| 3019 | |
| 3020 | entry = debugfs_create_file("trace", 0444, d_tracer, |
| 3021 | &global_trace, &tracing_fops); |
| 3022 | if (!entry) |
| 3023 | pr_warning("Could not create debugfs 'trace' entry\n"); |
| 3024 | |
| 3025 | entry = debugfs_create_file("available_tracers", 0444, d_tracer, |
| 3026 | &global_trace, &show_traces_fops); |
| 3027 | if (!entry) |
Frédéric Weisbecker | 98a983a | 2008-08-15 21:08:22 +0200 | [diff] [blame] | 3028 | pr_warning("Could not create debugfs 'available_tracers' entry\n"); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3029 | |
| 3030 | entry = debugfs_create_file("current_tracer", 0444, d_tracer, |
| 3031 | &global_trace, &set_tracer_fops); |
| 3032 | if (!entry) |
Frédéric Weisbecker | 98a983a | 2008-08-15 21:08:22 +0200 | [diff] [blame] | 3033 | pr_warning("Could not create debugfs 'current_tracer' entry\n"); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3034 | |
| 3035 | entry = debugfs_create_file("tracing_max_latency", 0644, d_tracer, |
| 3036 | &tracing_max_latency, |
| 3037 | &tracing_max_lat_fops); |
| 3038 | if (!entry) |
| 3039 | pr_warning("Could not create debugfs " |
| 3040 | "'tracing_max_latency' entry\n"); |
| 3041 | |
| 3042 | entry = debugfs_create_file("tracing_thresh", 0644, d_tracer, |
| 3043 | &tracing_thresh, &tracing_max_lat_fops); |
| 3044 | if (!entry) |
| 3045 | pr_warning("Could not create debugfs " |
Frédéric Weisbecker | 98a983a | 2008-08-15 21:08:22 +0200 | [diff] [blame] | 3046 | "'tracing_thresh' entry\n"); |
Ingo Molnar | 7bd2f24 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 3047 | entry = debugfs_create_file("README", 0644, d_tracer, |
| 3048 | NULL, &tracing_readme_fops); |
| 3049 | if (!entry) |
| 3050 | pr_warning("Could not create debugfs 'README' entry\n"); |
| 3051 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 3052 | entry = debugfs_create_file("trace_pipe", 0644, d_tracer, |
| 3053 | NULL, &tracing_pipe_fops); |
| 3054 | if (!entry) |
| 3055 | pr_warning("Could not create debugfs " |
Frédéric Weisbecker | 98a983a | 2008-08-15 21:08:22 +0200 | [diff] [blame] | 3056 | "'trace_pipe' entry\n"); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3057 | |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 3058 | entry = debugfs_create_file("trace_entries", 0644, d_tracer, |
| 3059 | &global_trace, &tracing_entries_fops); |
| 3060 | if (!entry) |
| 3061 | pr_warning("Could not create debugfs " |
Frédéric Weisbecker | 98a983a | 2008-08-15 21:08:22 +0200 | [diff] [blame] | 3062 | "'trace_entries' entry\n"); |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 3063 | |
Pekka Paalanen | 5bf9a1e | 2008-09-16 22:06:42 +0300 | [diff] [blame] | 3064 | entry = debugfs_create_file("trace_marker", 0220, d_tracer, |
| 3065 | NULL, &tracing_mark_fops); |
| 3066 | if (!entry) |
| 3067 | pr_warning("Could not create debugfs " |
| 3068 | "'trace_marker' entry\n"); |
| 3069 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3070 | #ifdef CONFIG_DYNAMIC_FTRACE |
| 3071 | entry = debugfs_create_file("dyn_ftrace_total_info", 0444, d_tracer, |
| 3072 | &ftrace_update_tot_cnt, |
| 3073 | &tracing_read_long_fops); |
| 3074 | if (!entry) |
| 3075 | pr_warning("Could not create debugfs " |
| 3076 | "'dyn_ftrace_total_info' entry\n"); |
| 3077 | #endif |
Ingo Molnar | d618b3e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 3078 | #ifdef CONFIG_SYSPROF_TRACER |
| 3079 | init_tracer_sysprof_debugfs(d_tracer); |
| 3080 | #endif |
Frédéric Weisbecker | b5ad384 | 2008-09-23 11:34:32 +0100 | [diff] [blame^] | 3081 | return 0; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3082 | } |
| 3083 | |
Pekka Paalanen | 801fe40 | 2008-09-16 21:58:24 +0300 | [diff] [blame] | 3084 | int trace_vprintk(unsigned long ip, const char *fmt, va_list args) |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 3085 | { |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 3086 | static DEFINE_SPINLOCK(trace_buf_lock); |
| 3087 | static char trace_buf[TRACE_BUF_SIZE]; |
Peter Zijlstra | f09ce57 | 2008-09-04 10:24:14 +0200 | [diff] [blame] | 3088 | |
| 3089 | struct trace_array *tr = &global_trace; |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 3090 | struct trace_array_cpu *data; |
| 3091 | struct trace_entry *entry; |
| 3092 | unsigned long flags; |
| 3093 | long disabled; |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 3094 | int cpu, len = 0, write, written = 0; |
| 3095 | |
Frédéric Weisbecker | 43a1538 | 2008-09-21 20:16:30 +0200 | [diff] [blame] | 3096 | if (!tr->ctrl || tracing_disabled) |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 3097 | return 0; |
| 3098 | |
| 3099 | local_irq_save(flags); |
| 3100 | cpu = raw_smp_processor_id(); |
| 3101 | data = tr->data[cpu]; |
| 3102 | disabled = atomic_inc_return(&data->disabled); |
| 3103 | |
Peter Zijlstra | f09ce57 | 2008-09-04 10:24:14 +0200 | [diff] [blame] | 3104 | if (unlikely(disabled != 1)) |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 3105 | goto out; |
| 3106 | |
| 3107 | spin_lock(&trace_buf_lock); |
Pekka Paalanen | 801fe40 | 2008-09-16 21:58:24 +0300 | [diff] [blame] | 3108 | len = vsnprintf(trace_buf, TRACE_BUF_SIZE, fmt, args); |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 3109 | |
| 3110 | len = min(len, TRACE_BUF_SIZE-1); |
| 3111 | trace_buf[len] = 0; |
| 3112 | |
| 3113 | __raw_spin_lock(&data->lock); |
| 3114 | entry = tracing_get_trace_entry(tr, data); |
| 3115 | tracing_generic_entry_update(entry, flags); |
| 3116 | entry->type = TRACE_PRINT; |
| 3117 | entry->field.print.ip = ip; |
| 3118 | |
| 3119 | write = min(len, (int)(TRACE_PRINT_BUF_SIZE-1)); |
| 3120 | |
| 3121 | memcpy(&entry->field.print.buf, trace_buf, write); |
| 3122 | entry->field.print.buf[write] = 0; |
| 3123 | written = write; |
| 3124 | |
| 3125 | if (written != len) |
| 3126 | entry->field.flags |= TRACE_FLAG_CONT; |
| 3127 | |
| 3128 | while (written != len) { |
| 3129 | entry = tracing_get_trace_entry(tr, data); |
| 3130 | |
| 3131 | entry->type = TRACE_CONT; |
| 3132 | write = min(len - written, (int)(TRACE_CONT_BUF_SIZE-1)); |
| 3133 | memcpy(&entry->cont.buf, trace_buf+written, write); |
| 3134 | entry->cont.buf[write] = 0; |
| 3135 | written += write; |
| 3136 | } |
| 3137 | __raw_spin_unlock(&data->lock); |
| 3138 | |
| 3139 | spin_unlock(&trace_buf_lock); |
| 3140 | |
| 3141 | out: |
| 3142 | atomic_dec(&data->disabled); |
| 3143 | local_irq_restore(flags); |
| 3144 | |
| 3145 | return len; |
| 3146 | } |
Pekka Paalanen | 801fe40 | 2008-09-16 21:58:24 +0300 | [diff] [blame] | 3147 | EXPORT_SYMBOL_GPL(trace_vprintk); |
| 3148 | |
| 3149 | int __ftrace_printk(unsigned long ip, const char *fmt, ...) |
| 3150 | { |
| 3151 | int ret; |
| 3152 | va_list ap; |
| 3153 | |
| 3154 | if (!(trace_flags & TRACE_ITER_PRINTK)) |
| 3155 | return 0; |
| 3156 | |
| 3157 | va_start(ap, fmt); |
| 3158 | ret = trace_vprintk(ip, fmt, ap); |
| 3159 | va_end(ap); |
| 3160 | return ret; |
| 3161 | } |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 3162 | EXPORT_SYMBOL_GPL(__ftrace_printk); |
| 3163 | |
Steven Rostedt | 3f5a54e | 2008-07-30 22:36:46 -0400 | [diff] [blame] | 3164 | static int trace_panic_handler(struct notifier_block *this, |
| 3165 | unsigned long event, void *unused) |
| 3166 | { |
| 3167 | ftrace_dump(); |
| 3168 | return NOTIFY_OK; |
| 3169 | } |
| 3170 | |
| 3171 | static struct notifier_block trace_panic_notifier = { |
| 3172 | .notifier_call = trace_panic_handler, |
| 3173 | .next = NULL, |
| 3174 | .priority = 150 /* priority: INT_MAX >= x >= 0 */ |
| 3175 | }; |
| 3176 | |
| 3177 | static int trace_die_handler(struct notifier_block *self, |
| 3178 | unsigned long val, |
| 3179 | void *data) |
| 3180 | { |
| 3181 | switch (val) { |
| 3182 | case DIE_OOPS: |
| 3183 | ftrace_dump(); |
| 3184 | break; |
| 3185 | default: |
| 3186 | break; |
| 3187 | } |
| 3188 | return NOTIFY_OK; |
| 3189 | } |
| 3190 | |
| 3191 | static struct notifier_block trace_die_notifier = { |
| 3192 | .notifier_call = trace_die_handler, |
| 3193 | .priority = 200 |
| 3194 | }; |
| 3195 | |
| 3196 | /* |
| 3197 | * printk is set to max of 1024, we really don't need it that big. |
| 3198 | * Nothing should be printing 1000 characters anyway. |
| 3199 | */ |
| 3200 | #define TRACE_MAX_PRINT 1000 |
| 3201 | |
| 3202 | /* |
| 3203 | * Define here KERN_TRACE so that we have one place to modify |
| 3204 | * it if we decide to change what log level the ftrace dump |
| 3205 | * should be at. |
| 3206 | */ |
| 3207 | #define KERN_TRACE KERN_INFO |
| 3208 | |
| 3209 | static void |
| 3210 | trace_printk_seq(struct trace_seq *s) |
| 3211 | { |
| 3212 | /* Probably should print a warning here. */ |
| 3213 | if (s->len >= 1000) |
| 3214 | s->len = 1000; |
| 3215 | |
| 3216 | /* should be zero ended, but we are paranoid. */ |
| 3217 | s->buffer[s->len] = 0; |
| 3218 | |
| 3219 | printk(KERN_TRACE "%s", s->buffer); |
| 3220 | |
| 3221 | trace_seq_reset(s); |
| 3222 | } |
| 3223 | |
| 3224 | |
| 3225 | void ftrace_dump(void) |
| 3226 | { |
| 3227 | static DEFINE_SPINLOCK(ftrace_dump_lock); |
| 3228 | /* use static because iter can be a bit big for the stack */ |
| 3229 | static struct trace_iterator iter; |
| 3230 | struct trace_array_cpu *data; |
| 3231 | static cpumask_t mask; |
| 3232 | static int dump_ran; |
| 3233 | unsigned long flags; |
| 3234 | int cnt = 0; |
| 3235 | int cpu; |
| 3236 | |
| 3237 | /* only one dump */ |
| 3238 | spin_lock_irqsave(&ftrace_dump_lock, flags); |
| 3239 | if (dump_ran) |
| 3240 | goto out; |
| 3241 | |
| 3242 | dump_ran = 1; |
| 3243 | |
| 3244 | /* No turning back! */ |
| 3245 | ftrace_kill_atomic(); |
| 3246 | |
| 3247 | printk(KERN_TRACE "Dumping ftrace buffer:\n"); |
| 3248 | |
| 3249 | iter.tr = &global_trace; |
| 3250 | iter.trace = current_trace; |
| 3251 | |
| 3252 | /* |
| 3253 | * We need to stop all tracing on all CPUS to read the |
| 3254 | * the next buffer. This is a bit expensive, but is |
| 3255 | * not done often. We fill all what we can read, |
| 3256 | * and then release the locks again. |
| 3257 | */ |
| 3258 | |
| 3259 | cpus_clear(mask); |
| 3260 | |
| 3261 | for_each_tracing_cpu(cpu) { |
| 3262 | data = iter.tr->data[cpu]; |
| 3263 | |
| 3264 | if (!head_page(data) || !data->trace_idx) |
| 3265 | continue; |
| 3266 | |
| 3267 | atomic_inc(&data->disabled); |
| 3268 | cpu_set(cpu, mask); |
| 3269 | } |
| 3270 | |
| 3271 | for_each_cpu_mask(cpu, mask) { |
| 3272 | data = iter.tr->data[cpu]; |
| 3273 | __raw_spin_lock(&data->lock); |
| 3274 | |
| 3275 | if (data->overrun > iter.last_overrun[cpu]) |
| 3276 | iter.overrun[cpu] += |
| 3277 | data->overrun - iter.last_overrun[cpu]; |
| 3278 | iter.last_overrun[cpu] = data->overrun; |
| 3279 | } |
| 3280 | |
| 3281 | while (!trace_empty(&iter)) { |
| 3282 | |
| 3283 | if (!cnt) |
| 3284 | printk(KERN_TRACE "---------------------------------\n"); |
| 3285 | |
| 3286 | cnt++; |
| 3287 | |
| 3288 | /* reset all but tr, trace, and overruns */ |
| 3289 | memset(&iter.seq, 0, |
| 3290 | sizeof(struct trace_iterator) - |
| 3291 | offsetof(struct trace_iterator, seq)); |
| 3292 | iter.iter_flags |= TRACE_FILE_LAT_FMT; |
| 3293 | iter.pos = -1; |
| 3294 | |
| 3295 | if (find_next_entry_inc(&iter) != NULL) { |
| 3296 | print_trace_line(&iter); |
| 3297 | trace_consume(&iter); |
| 3298 | } |
| 3299 | |
| 3300 | trace_printk_seq(&iter.seq); |
| 3301 | } |
| 3302 | |
| 3303 | if (!cnt) |
| 3304 | printk(KERN_TRACE " (ftrace buffer empty)\n"); |
| 3305 | else |
| 3306 | printk(KERN_TRACE "---------------------------------\n"); |
| 3307 | |
| 3308 | for_each_cpu_mask(cpu, mask) { |
| 3309 | data = iter.tr->data[cpu]; |
| 3310 | __raw_spin_unlock(&data->lock); |
| 3311 | } |
| 3312 | |
| 3313 | for_each_cpu_mask(cpu, mask) { |
| 3314 | data = iter.tr->data[cpu]; |
| 3315 | atomic_dec(&data->disabled); |
| 3316 | } |
| 3317 | |
| 3318 | |
| 3319 | out: |
| 3320 | spin_unlock_irqrestore(&ftrace_dump_lock, flags); |
| 3321 | } |
| 3322 | |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 3323 | static int trace_alloc_page(void) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3324 | { |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 3325 | struct trace_array_cpu *data; |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 3326 | struct page *page, *tmp; |
| 3327 | LIST_HEAD(pages); |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 3328 | void *array; |
Steven Rostedt | 3eefae9 | 2008-05-12 21:21:04 +0200 | [diff] [blame] | 3329 | unsigned pages_allocated = 0; |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 3330 | int i; |
| 3331 | |
| 3332 | /* first allocate a page for each CPU */ |
Steven Rostedt | ab46428 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 3333 | for_each_tracing_cpu(i) { |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 3334 | array = (void *)__get_free_page(GFP_KERNEL); |
| 3335 | if (array == NULL) { |
| 3336 | printk(KERN_ERR "tracer: failed to allocate page" |
| 3337 | "for trace buffer!\n"); |
| 3338 | goto free_pages; |
| 3339 | } |
| 3340 | |
Steven Rostedt | 3eefae9 | 2008-05-12 21:21:04 +0200 | [diff] [blame] | 3341 | pages_allocated++; |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 3342 | page = virt_to_page(array); |
| 3343 | list_add(&page->lru, &pages); |
| 3344 | |
| 3345 | /* Only allocate if we are actually using the max trace */ |
| 3346 | #ifdef CONFIG_TRACER_MAX_TRACE |
| 3347 | array = (void *)__get_free_page(GFP_KERNEL); |
| 3348 | if (array == NULL) { |
| 3349 | printk(KERN_ERR "tracer: failed to allocate page" |
| 3350 | "for trace buffer!\n"); |
| 3351 | goto free_pages; |
| 3352 | } |
Steven Rostedt | 3eefae9 | 2008-05-12 21:21:04 +0200 | [diff] [blame] | 3353 | pages_allocated++; |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 3354 | page = virt_to_page(array); |
| 3355 | list_add(&page->lru, &pages); |
| 3356 | #endif |
| 3357 | } |
| 3358 | |
| 3359 | /* Now that we successfully allocate a page per CPU, add them */ |
Steven Rostedt | ab46428 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 3360 | for_each_tracing_cpu(i) { |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 3361 | data = global_trace.data[i]; |
| 3362 | page = list_entry(pages.next, struct page, lru); |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 3363 | list_del_init(&page->lru); |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 3364 | list_add_tail(&page->lru, &data->trace_pages); |
| 3365 | ClearPageLRU(page); |
| 3366 | |
| 3367 | #ifdef CONFIG_TRACER_MAX_TRACE |
| 3368 | data = max_tr.data[i]; |
| 3369 | page = list_entry(pages.next, struct page, lru); |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 3370 | list_del_init(&page->lru); |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 3371 | list_add_tail(&page->lru, &data->trace_pages); |
| 3372 | SetPageLRU(page); |
| 3373 | #endif |
| 3374 | } |
Steven Rostedt | 3eefae9 | 2008-05-12 21:21:04 +0200 | [diff] [blame] | 3375 | tracing_pages_allocated += pages_allocated; |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 3376 | global_trace.entries += ENTRIES_PER_PAGE; |
| 3377 | |
| 3378 | return 0; |
| 3379 | |
| 3380 | free_pages: |
| 3381 | list_for_each_entry_safe(page, tmp, &pages, lru) { |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 3382 | list_del_init(&page->lru); |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 3383 | __free_page(page); |
| 3384 | } |
| 3385 | return -ENOMEM; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3386 | } |
| 3387 | |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 3388 | static int trace_free_page(void) |
| 3389 | { |
| 3390 | struct trace_array_cpu *data; |
| 3391 | struct page *page; |
| 3392 | struct list_head *p; |
| 3393 | int i; |
| 3394 | int ret = 0; |
| 3395 | |
| 3396 | /* free one page from each buffer */ |
Steven Rostedt | ab46428 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 3397 | for_each_tracing_cpu(i) { |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 3398 | data = global_trace.data[i]; |
| 3399 | p = data->trace_pages.next; |
| 3400 | if (p == &data->trace_pages) { |
| 3401 | /* should never happen */ |
| 3402 | WARN_ON(1); |
| 3403 | tracing_disabled = 1; |
| 3404 | ret = -1; |
| 3405 | break; |
| 3406 | } |
| 3407 | page = list_entry(p, struct page, lru); |
| 3408 | ClearPageLRU(page); |
| 3409 | list_del(&page->lru); |
Steven Rostedt | 3eefae9 | 2008-05-12 21:21:04 +0200 | [diff] [blame] | 3410 | tracing_pages_allocated--; |
| 3411 | tracing_pages_allocated--; |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 3412 | __free_page(page); |
| 3413 | |
| 3414 | tracing_reset(data); |
| 3415 | |
| 3416 | #ifdef CONFIG_TRACER_MAX_TRACE |
| 3417 | data = max_tr.data[i]; |
| 3418 | p = data->trace_pages.next; |
| 3419 | if (p == &data->trace_pages) { |
| 3420 | /* should never happen */ |
| 3421 | WARN_ON(1); |
| 3422 | tracing_disabled = 1; |
| 3423 | ret = -1; |
| 3424 | break; |
| 3425 | } |
| 3426 | page = list_entry(p, struct page, lru); |
| 3427 | ClearPageLRU(page); |
| 3428 | list_del(&page->lru); |
| 3429 | __free_page(page); |
| 3430 | |
| 3431 | tracing_reset(data); |
| 3432 | #endif |
| 3433 | } |
| 3434 | global_trace.entries -= ENTRIES_PER_PAGE; |
| 3435 | |
| 3436 | return ret; |
| 3437 | } |
| 3438 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3439 | __init static int tracer_alloc_buffers(void) |
| 3440 | { |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 3441 | struct trace_array_cpu *data; |
| 3442 | void *array; |
| 3443 | struct page *page; |
| 3444 | int pages = 0; |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 3445 | int ret = -ENOMEM; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3446 | int i; |
| 3447 | |
Steven Rostedt | ab46428 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 3448 | /* TODO: make the number of buffers hot pluggable with CPUS */ |
| 3449 | tracing_nr_buffers = num_possible_cpus(); |
| 3450 | tracing_buffer_mask = cpu_possible_map; |
| 3451 | |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 3452 | /* Allocate the first page for all buffers */ |
Steven Rostedt | ab46428 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 3453 | for_each_tracing_cpu(i) { |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 3454 | data = global_trace.data[i] = &per_cpu(global_trace_cpu, i); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3455 | max_tr.data[i] = &per_cpu(max_data, i); |
| 3456 | |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 3457 | array = (void *)__get_free_page(GFP_KERNEL); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3458 | if (array == NULL) { |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 3459 | printk(KERN_ERR "tracer: failed to allocate page" |
| 3460 | "for trace buffer!\n"); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3461 | goto free_buffers; |
| 3462 | } |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 3463 | |
| 3464 | /* set the array to the list */ |
| 3465 | INIT_LIST_HEAD(&data->trace_pages); |
| 3466 | page = virt_to_page(array); |
| 3467 | list_add(&page->lru, &data->trace_pages); |
| 3468 | /* use the LRU flag to differentiate the two buffers */ |
| 3469 | ClearPageLRU(page); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3470 | |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 3471 | data->lock = (raw_spinlock_t)__RAW_SPIN_LOCK_UNLOCKED; |
| 3472 | max_tr.data[i]->lock = (raw_spinlock_t)__RAW_SPIN_LOCK_UNLOCKED; |
| 3473 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3474 | /* Only allocate if we are actually using the max trace */ |
| 3475 | #ifdef CONFIG_TRACER_MAX_TRACE |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 3476 | array = (void *)__get_free_page(GFP_KERNEL); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3477 | if (array == NULL) { |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 3478 | printk(KERN_ERR "tracer: failed to allocate page" |
| 3479 | "for trace buffer!\n"); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3480 | goto free_buffers; |
| 3481 | } |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 3482 | |
| 3483 | INIT_LIST_HEAD(&max_tr.data[i]->trace_pages); |
| 3484 | page = virt_to_page(array); |
| 3485 | list_add(&page->lru, &max_tr.data[i]->trace_pages); |
| 3486 | SetPageLRU(page); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3487 | #endif |
| 3488 | } |
| 3489 | |
| 3490 | /* |
| 3491 | * Since we allocate by orders of pages, we may be able to |
| 3492 | * round up a bit. |
| 3493 | */ |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 3494 | global_trace.entries = ENTRIES_PER_PAGE; |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 3495 | pages++; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3496 | |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 3497 | while (global_trace.entries < trace_nr_entries) { |
| 3498 | if (trace_alloc_page()) |
| 3499 | break; |
| 3500 | pages++; |
| 3501 | } |
Steven Rostedt | 89b2f97 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 3502 | max_tr.entries = global_trace.entries; |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 3503 | |
Jiri Slaby | 20764ff | 2008-06-12 11:27:03 +0200 | [diff] [blame] | 3504 | pr_info("tracer: %d pages allocated for %ld entries of %ld bytes\n", |
| 3505 | pages, trace_nr_entries, (long)TRACE_ENTRY_SIZE); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3506 | pr_info(" actual entries %ld\n", global_trace.entries); |
| 3507 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3508 | trace_init_cmdlines(); |
| 3509 | |
Frédéric Weisbecker | 43a1538 | 2008-09-21 20:16:30 +0200 | [diff] [blame] | 3510 | register_tracer(&nop_trace); |
Frédéric Weisbecker | b5ad384 | 2008-09-23 11:34:32 +0100 | [diff] [blame^] | 3511 | #ifdef CONFIG_BOOT_TRACER |
| 3512 | register_tracer(&boot_tracer); |
| 3513 | current_trace = &boot_tracer; |
| 3514 | current_trace->init(&global_trace); |
| 3515 | #else |
Frédéric Weisbecker | 43a1538 | 2008-09-21 20:16:30 +0200 | [diff] [blame] | 3516 | current_trace = &nop_trace; |
Frédéric Weisbecker | b5ad384 | 2008-09-23 11:34:32 +0100 | [diff] [blame^] | 3517 | #endif |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3518 | |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 3519 | /* All seems OK, enable tracing */ |
Steven Rostedt | 4902f88 | 2008-05-22 00:22:18 -0400 | [diff] [blame] | 3520 | global_trace.ctrl = tracer_enabled; |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 3521 | tracing_disabled = 0; |
Steven Rostedt | 3f5a54e | 2008-07-30 22:36:46 -0400 | [diff] [blame] | 3522 | atomic_notifier_chain_register(&panic_notifier_list, |
| 3523 | &trace_panic_notifier); |
| 3524 | |
| 3525 | register_die_notifier(&trace_die_notifier); |
| 3526 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3527 | return 0; |
| 3528 | |
| 3529 | free_buffers: |
| 3530 | for (i-- ; i >= 0; i--) { |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 3531 | struct page *page, *tmp; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3532 | struct trace_array_cpu *data = global_trace.data[i]; |
| 3533 | |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 3534 | if (data) { |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 3535 | list_for_each_entry_safe(page, tmp, |
| 3536 | &data->trace_pages, lru) { |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 3537 | list_del_init(&page->lru); |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 3538 | __free_page(page); |
| 3539 | } |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3540 | } |
| 3541 | |
| 3542 | #ifdef CONFIG_TRACER_MAX_TRACE |
| 3543 | data = max_tr.data[i]; |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 3544 | if (data) { |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 3545 | list_for_each_entry_safe(page, tmp, |
| 3546 | &data->trace_pages, lru) { |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 3547 | list_del_init(&page->lru); |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 3548 | __free_page(page); |
| 3549 | } |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3550 | } |
| 3551 | #endif |
| 3552 | } |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 3553 | return ret; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3554 | } |
Frédéric Weisbecker | b5ad384 | 2008-09-23 11:34:32 +0100 | [diff] [blame^] | 3555 | early_initcall(tracer_alloc_buffers); |
| 3556 | fs_initcall(tracer_init_debugfs); |