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> |
| 17 | #include <linux/debugfs.h> |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 18 | #include <linux/pagemap.h> |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 19 | #include <linux/hardirq.h> |
| 20 | #include <linux/linkage.h> |
| 21 | #include <linux/uaccess.h> |
| 22 | #include <linux/ftrace.h> |
| 23 | #include <linux/module.h> |
| 24 | #include <linux/percpu.h> |
| 25 | #include <linux/ctype.h> |
| 26 | #include <linux/init.h> |
Soeren Sandmann Pedersen | 2a2cc8f | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 27 | #include <linux/poll.h> |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 28 | #include <linux/gfp.h> |
| 29 | #include <linux/fs.h> |
Abhishek Sagar | 76094a2 | 2008-05-28 00:03:18 +0530 | [diff] [blame^] | 30 | #include <linux/kprobes.h> |
Steven Rostedt | 3eefae9 | 2008-05-12 21:21:04 +0200 | [diff] [blame] | 31 | #include <linux/writeback.h> |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 32 | |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 33 | #include <linux/stacktrace.h> |
| 34 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 35 | #include "trace.h" |
| 36 | |
| 37 | unsigned long __read_mostly tracing_max_latency = (cycle_t)ULONG_MAX; |
| 38 | unsigned long __read_mostly tracing_thresh; |
| 39 | |
Steven Rostedt | ab46428 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 40 | static unsigned long __read_mostly tracing_nr_buffers; |
| 41 | static cpumask_t __read_mostly tracing_buffer_mask; |
| 42 | |
| 43 | #define for_each_tracing_cpu(cpu) \ |
| 44 | for_each_cpu_mask(cpu, tracing_buffer_mask) |
| 45 | |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 46 | /* dummy trace to disable tracing */ |
Steven Rostedt | cffae43 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 47 | static struct tracer no_tracer __read_mostly = { |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 48 | .name = "none", |
| 49 | }; |
| 50 | |
| 51 | static int trace_alloc_page(void); |
| 52 | static int trace_free_page(void); |
| 53 | |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 54 | static int tracing_disabled = 1; |
| 55 | |
Steven Rostedt | 3eefae9 | 2008-05-12 21:21:04 +0200 | [diff] [blame] | 56 | static unsigned long tracing_pages_allocated; |
| 57 | |
Thomas Gleixner | 72829bc | 2008-05-23 21:37:28 +0200 | [diff] [blame] | 58 | long |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 59 | ns2usecs(cycle_t nsec) |
| 60 | { |
| 61 | nsec += 500; |
| 62 | do_div(nsec, 1000); |
| 63 | return nsec; |
| 64 | } |
| 65 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 66 | cycle_t ftrace_now(int cpu) |
Ingo Molnar | 750ed1a | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 67 | { |
Ingo Molnar | 0fd9e0d | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 68 | return cpu_clock(cpu); |
Ingo Molnar | 750ed1a | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 69 | } |
| 70 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 71 | /* |
| 72 | * The global_trace is the descriptor that holds the tracing |
| 73 | * buffers for the live tracing. For each CPU, it contains |
| 74 | * a link list of pages that will store trace entries. The |
| 75 | * page descriptor of the pages in the memory is used to hold |
| 76 | * the link list by linking the lru item in the page descriptor |
| 77 | * to each of the pages in the buffer per CPU. |
| 78 | * |
| 79 | * For each active CPU there is a data field that holds the |
| 80 | * pages for the buffer for that CPU. Each CPU has the same number |
| 81 | * of pages allocated for its buffer. |
| 82 | */ |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 83 | static struct trace_array global_trace; |
| 84 | |
| 85 | static DEFINE_PER_CPU(struct trace_array_cpu, global_trace_cpu); |
| 86 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 87 | /* |
| 88 | * The max_tr is used to snapshot the global_trace when a maximum |
| 89 | * latency is reached. Some tracers will use this to store a maximum |
| 90 | * trace while it continues examining live traces. |
| 91 | * |
| 92 | * The buffers for the max_tr are set up the same as the global_trace. |
| 93 | * When a snapshot is taken, the link list of the max_tr is swapped |
| 94 | * with the link list of the global_trace and the buffers are reset for |
| 95 | * the global_trace so the tracing can continue. |
| 96 | */ |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 97 | static struct trace_array max_tr; |
| 98 | |
| 99 | static DEFINE_PER_CPU(struct trace_array_cpu, max_data); |
| 100 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 101 | /* tracer_enabled is used to toggle activation of a tracer */ |
Steven Rostedt | 26994ea | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 102 | static int tracer_enabled = 1; |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 103 | |
| 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. |
| 108 | */ |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 109 | static unsigned long trace_nr_entries = 65536UL; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 110 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 111 | /* trace_types holds a link list of available tracers. */ |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 112 | static struct tracer *trace_types __read_mostly; |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 113 | |
| 114 | /* current_trace points to the tracer that is currently active */ |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 115 | static struct tracer *current_trace __read_mostly; |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 116 | |
| 117 | /* |
| 118 | * max_tracer_type_len is used to simplify the allocating of |
| 119 | * buffers to read userspace tracer names. We keep track of |
| 120 | * the longest tracer name registered. |
| 121 | */ |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 122 | static int max_tracer_type_len; |
| 123 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 124 | /* |
| 125 | * trace_types_lock is used to protect the trace_types list. |
| 126 | * This lock is also used to keep user access serialized. |
| 127 | * Accesses from userspace will grab this lock while userspace |
| 128 | * activities happen inside the kernel. |
| 129 | */ |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 130 | static DEFINE_MUTEX(trace_types_lock); |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 131 | |
| 132 | /* trace_wait is a waitqueue for tasks blocked on trace_poll */ |
Ingo Molnar | 4e65551 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 133 | static DECLARE_WAIT_QUEUE_HEAD(trace_wait); |
| 134 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 135 | /* trace_flags holds iter_ctrl options */ |
Ingo Molnar | 4e65551 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 136 | unsigned long trace_flags = TRACE_ITER_PRINT_PARENT; |
| 137 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 138 | /** |
| 139 | * trace_wake_up - wake up tasks waiting for trace input |
| 140 | * |
| 141 | * Simply wakes up any task that is blocked on the trace_wait |
| 142 | * queue. These is used with trace_poll for tasks polling the trace. |
| 143 | */ |
Ingo Molnar | 4e65551 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 144 | void trace_wake_up(void) |
| 145 | { |
Ingo Molnar | 017730c | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 146 | /* |
| 147 | * The runqueue_is_locked() can fail, but this is the best we |
| 148 | * have for now: |
| 149 | */ |
| 150 | if (!(trace_flags & TRACE_ITER_BLOCK) && !runqueue_is_locked()) |
Ingo Molnar | 4e65551 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 151 | wake_up(&trace_wait); |
| 152 | } |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 153 | |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 154 | #define ENTRIES_PER_PAGE (PAGE_SIZE / sizeof(struct trace_entry)) |
| 155 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 156 | static int __init set_nr_entries(char *str) |
| 157 | { |
Steven Rostedt | c6caeeb | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 158 | unsigned long nr_entries; |
| 159 | int ret; |
| 160 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 161 | if (!str) |
| 162 | return 0; |
Steven Rostedt | c6caeeb | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 163 | ret = strict_strtoul(str, 0, &nr_entries); |
| 164 | /* nr_entries can not be zero */ |
| 165 | if (ret < 0 || nr_entries == 0) |
| 166 | return 0; |
| 167 | trace_nr_entries = nr_entries; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 168 | return 1; |
| 169 | } |
| 170 | __setup("trace_entries=", set_nr_entries); |
| 171 | |
Steven Rostedt | 57f50be | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 172 | unsigned long nsecs_to_usecs(unsigned long nsecs) |
| 173 | { |
| 174 | return nsecs / 1000; |
| 175 | } |
| 176 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 177 | /* |
| 178 | * trace_flag_type is an enumeration that holds different |
| 179 | * states when a trace occurs. These are: |
| 180 | * IRQS_OFF - interrupts were disabled |
| 181 | * NEED_RESCED - reschedule is requested |
| 182 | * HARDIRQ - inside an interrupt handler |
| 183 | * SOFTIRQ - inside a softirq handler |
| 184 | */ |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 185 | enum trace_flag_type { |
| 186 | TRACE_FLAG_IRQS_OFF = 0x01, |
| 187 | TRACE_FLAG_NEED_RESCHED = 0x02, |
| 188 | TRACE_FLAG_HARDIRQ = 0x04, |
| 189 | TRACE_FLAG_SOFTIRQ = 0x08, |
| 190 | }; |
| 191 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 192 | /* |
| 193 | * TRACE_ITER_SYM_MASK masks the options in trace_flags that |
| 194 | * control the output of kernel symbols. |
| 195 | */ |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 196 | #define TRACE_ITER_SYM_MASK \ |
| 197 | (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR) |
| 198 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 199 | /* These must match the bit postions in trace_iterator_flags */ |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 200 | static const char *trace_options[] = { |
| 201 | "print-parent", |
| 202 | "sym-offset", |
| 203 | "sym-addr", |
| 204 | "verbose", |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 205 | "raw", |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 206 | "hex", |
Ingo Molnar | cb0f12a | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 207 | "bin", |
Soeren Sandmann Pedersen | 2a2cc8f | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 208 | "block", |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 209 | "stacktrace", |
Ingo Molnar | 4ac3ba4 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 210 | "sched-tree", |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 211 | NULL |
| 212 | }; |
| 213 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 214 | /* |
| 215 | * ftrace_max_lock is used to protect the swapping of buffers |
| 216 | * when taking a max snapshot. The buffers themselves are |
| 217 | * protected by per_cpu spinlocks. But the action of the swap |
| 218 | * needs its own lock. |
| 219 | * |
| 220 | * This is defined as a raw_spinlock_t in order to help |
| 221 | * with performance when lockdep debugging is enabled. |
| 222 | */ |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 223 | static raw_spinlock_t ftrace_max_lock = |
| 224 | (raw_spinlock_t)__RAW_SPIN_LOCK_UNLOCKED; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 225 | |
| 226 | /* |
| 227 | * Copy the new maximum trace into the separate maximum-trace |
| 228 | * structure. (this way the maximum trace is permanently saved, |
| 229 | * for later retrieval via /debugfs/tracing/latency_trace) |
| 230 | */ |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 231 | static void |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 232 | __update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu) |
| 233 | { |
| 234 | struct trace_array_cpu *data = tr->data[cpu]; |
| 235 | |
| 236 | max_tr.cpu = cpu; |
| 237 | max_tr.time_start = data->preempt_timestamp; |
| 238 | |
| 239 | data = max_tr.data[cpu]; |
| 240 | data->saved_latency = tracing_max_latency; |
| 241 | |
| 242 | memcpy(data->comm, tsk->comm, TASK_COMM_LEN); |
| 243 | data->pid = tsk->pid; |
| 244 | data->uid = tsk->uid; |
| 245 | data->nice = tsk->static_prio - 20 - MAX_RT_PRIO; |
| 246 | data->policy = tsk->policy; |
| 247 | data->rt_priority = tsk->rt_priority; |
| 248 | |
| 249 | /* record this tasks comm */ |
| 250 | tracing_record_cmdline(current); |
| 251 | } |
| 252 | |
Steven Rostedt | 19384c0 | 2008-05-22 00:22:16 -0400 | [diff] [blame] | 253 | #define CHECK_COND(cond) \ |
| 254 | if (unlikely(cond)) { \ |
| 255 | tracing_disabled = 1; \ |
| 256 | WARN_ON(1); \ |
| 257 | return -1; \ |
| 258 | } |
| 259 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 260 | /** |
| 261 | * check_pages - integrity check of trace buffers |
| 262 | * |
| 263 | * 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] | 264 | * been corrupted. |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 265 | */ |
Steven Rostedt | 19384c0 | 2008-05-22 00:22:16 -0400 | [diff] [blame] | 266 | int check_pages(struct trace_array_cpu *data) |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 267 | { |
| 268 | struct page *page, *tmp; |
| 269 | |
Steven Rostedt | 19384c0 | 2008-05-22 00:22:16 -0400 | [diff] [blame] | 270 | CHECK_COND(data->trace_pages.next->prev != &data->trace_pages); |
| 271 | CHECK_COND(data->trace_pages.prev->next != &data->trace_pages); |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 272 | |
| 273 | list_for_each_entry_safe(page, tmp, &data->trace_pages, lru) { |
Steven Rostedt | 19384c0 | 2008-05-22 00:22:16 -0400 | [diff] [blame] | 274 | CHECK_COND(page->lru.next->prev != &page->lru); |
| 275 | CHECK_COND(page->lru.prev->next != &page->lru); |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 276 | } |
Steven Rostedt | 19384c0 | 2008-05-22 00:22:16 -0400 | [diff] [blame] | 277 | |
| 278 | return 0; |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 279 | } |
| 280 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 281 | /** |
| 282 | * head_page - page address of the first page in per_cpu buffer. |
| 283 | * |
| 284 | * head_page returns the page address of the first page in |
| 285 | * a per_cpu buffer. This also preforms various consistency |
| 286 | * checks to make sure the buffer has not been corrupted. |
| 287 | */ |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 288 | void *head_page(struct trace_array_cpu *data) |
| 289 | { |
| 290 | struct page *page; |
| 291 | |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 292 | if (list_empty(&data->trace_pages)) |
| 293 | return NULL; |
| 294 | |
| 295 | page = list_entry(data->trace_pages.next, struct page, lru); |
| 296 | BUG_ON(&page->lru == &data->trace_pages); |
| 297 | |
| 298 | return page_address(page); |
| 299 | } |
| 300 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 301 | /** |
| 302 | * trace_seq_printf - sequence printing of trace information |
| 303 | * @s: trace sequence descriptor |
| 304 | * @fmt: printf format string |
| 305 | * |
| 306 | * The tracer may use either sequence operations or its own |
| 307 | * copy to user routines. To simplify formating of a trace |
| 308 | * trace_seq_printf is used to store strings into a special |
| 309 | * buffer (@s). Then the output may be either used by |
| 310 | * the sequencer or pulled into another buffer. |
| 311 | */ |
Thomas Gleixner | 72829bc | 2008-05-23 21:37:28 +0200 | [diff] [blame] | 312 | int |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 313 | trace_seq_printf(struct trace_seq *s, const char *fmt, ...) |
| 314 | { |
| 315 | int len = (PAGE_SIZE - 1) - s->len; |
| 316 | va_list ap; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 317 | int ret; |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 318 | |
| 319 | if (!len) |
| 320 | return 0; |
| 321 | |
| 322 | va_start(ap, fmt); |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 323 | ret = vsnprintf(s->buffer + s->len, len, fmt, ap); |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 324 | va_end(ap); |
| 325 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 326 | /* If we can't write it all, don't bother writing anything */ |
Thomas Gleixner | 72829bc | 2008-05-23 21:37:28 +0200 | [diff] [blame] | 327 | if (ret >= len) |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 328 | return 0; |
| 329 | |
| 330 | s->len += ret; |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 331 | |
| 332 | return len; |
| 333 | } |
| 334 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 335 | /** |
| 336 | * trace_seq_puts - trace sequence printing of simple string |
| 337 | * @s: trace sequence descriptor |
| 338 | * @str: simple string to record |
| 339 | * |
| 340 | * The tracer may use either the sequence operations or its own |
| 341 | * copy to user routines. This function records a simple string |
| 342 | * into a special buffer (@s) for later retrieval by a sequencer |
| 343 | * or other mechanism. |
| 344 | */ |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 345 | static int |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 346 | trace_seq_puts(struct trace_seq *s, const char *str) |
| 347 | { |
| 348 | int len = strlen(str); |
| 349 | |
| 350 | if (len > ((PAGE_SIZE - 1) - s->len)) |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 351 | return 0; |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 352 | |
| 353 | memcpy(s->buffer + s->len, str, len); |
| 354 | s->len += len; |
| 355 | |
| 356 | return len; |
| 357 | } |
| 358 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 359 | static int |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 360 | trace_seq_putc(struct trace_seq *s, unsigned char c) |
| 361 | { |
| 362 | if (s->len >= (PAGE_SIZE - 1)) |
| 363 | return 0; |
| 364 | |
| 365 | s->buffer[s->len++] = c; |
| 366 | |
| 367 | return 1; |
| 368 | } |
| 369 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 370 | static int |
Ingo Molnar | cb0f12a | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 371 | trace_seq_putmem(struct trace_seq *s, void *mem, size_t len) |
| 372 | { |
| 373 | if (len > ((PAGE_SIZE - 1) - s->len)) |
| 374 | return 0; |
| 375 | |
| 376 | memcpy(s->buffer + s->len, mem, len); |
| 377 | s->len += len; |
| 378 | |
| 379 | return len; |
| 380 | } |
| 381 | |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 382 | #define HEX_CHARS 17 |
Thomas Gleixner | 93dcc6e | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 383 | static const char hex2asc[] = "0123456789abcdef"; |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 384 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 385 | static int |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 386 | trace_seq_putmem_hex(struct trace_seq *s, void *mem, size_t len) |
| 387 | { |
| 388 | unsigned char hex[HEX_CHARS]; |
Thomas Gleixner | 93dcc6e | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 389 | unsigned char *data = mem; |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 390 | unsigned char byte; |
| 391 | int i, j; |
| 392 | |
| 393 | BUG_ON(len >= HEX_CHARS); |
| 394 | |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 395 | #ifdef __BIG_ENDIAN |
| 396 | for (i = 0, j = 0; i < len; i++) { |
| 397 | #else |
| 398 | for (i = len-1, j = 0; i >= 0; i--) { |
| 399 | #endif |
| 400 | byte = data[i]; |
| 401 | |
Thomas Gleixner | 93dcc6e | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 402 | hex[j++] = hex2asc[byte & 0x0f]; |
| 403 | hex[j++] = hex2asc[byte >> 4]; |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 404 | } |
Thomas Gleixner | 93dcc6e | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 405 | hex[j++] = ' '; |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 406 | |
| 407 | return trace_seq_putmem(s, hex, j); |
| 408 | } |
| 409 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 410 | static void |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 411 | trace_seq_reset(struct trace_seq *s) |
| 412 | { |
| 413 | s->len = 0; |
Pekka Paalanen | 6c6c279 | 2008-05-12 21:21:02 +0200 | [diff] [blame] | 414 | s->readpos = 0; |
| 415 | } |
| 416 | |
| 417 | ssize_t trace_seq_to_user(struct trace_seq *s, char __user *ubuf, size_t cnt) |
| 418 | { |
| 419 | int len; |
| 420 | int ret; |
| 421 | |
| 422 | if (s->len <= s->readpos) |
| 423 | return -EBUSY; |
| 424 | |
| 425 | len = s->len - s->readpos; |
| 426 | if (cnt > len) |
| 427 | cnt = len; |
| 428 | ret = copy_to_user(ubuf, s->buffer + s->readpos, cnt); |
| 429 | if (ret) |
| 430 | return -EFAULT; |
| 431 | |
| 432 | s->readpos += len; |
| 433 | return cnt; |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 434 | } |
| 435 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 436 | static void |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 437 | trace_print_seq(struct seq_file *m, struct trace_seq *s) |
| 438 | { |
| 439 | int len = s->len >= PAGE_SIZE ? PAGE_SIZE - 1 : s->len; |
| 440 | |
| 441 | s->buffer[len] = 0; |
| 442 | seq_puts(m, s->buffer); |
| 443 | |
| 444 | trace_seq_reset(s); |
| 445 | } |
| 446 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 447 | /* |
| 448 | * flip the trace buffers between two trace descriptors. |
| 449 | * This usually is the buffers between the global_trace and |
| 450 | * the max_tr to record a snapshot of a current trace. |
| 451 | * |
| 452 | * The ftrace_max_lock must be held. |
| 453 | */ |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 454 | static void |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 455 | flip_trace(struct trace_array_cpu *tr1, struct trace_array_cpu *tr2) |
| 456 | { |
| 457 | struct list_head flip_pages; |
| 458 | |
| 459 | INIT_LIST_HEAD(&flip_pages); |
| 460 | |
Steven Rostedt | 93a588f | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 461 | memcpy(&tr1->trace_head_idx, &tr2->trace_head_idx, |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 462 | sizeof(struct trace_array_cpu) - |
Steven Rostedt | 93a588f | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 463 | offsetof(struct trace_array_cpu, trace_head_idx)); |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 464 | |
| 465 | check_pages(tr1); |
| 466 | check_pages(tr2); |
| 467 | list_splice_init(&tr1->trace_pages, &flip_pages); |
| 468 | list_splice_init(&tr2->trace_pages, &tr1->trace_pages); |
| 469 | list_splice_init(&flip_pages, &tr2->trace_pages); |
| 470 | BUG_ON(!list_empty(&flip_pages)); |
| 471 | check_pages(tr1); |
| 472 | check_pages(tr2); |
| 473 | } |
| 474 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 475 | /** |
| 476 | * update_max_tr - snapshot all trace buffers from global_trace to max_tr |
| 477 | * @tr: tracer |
| 478 | * @tsk: the task with the latency |
| 479 | * @cpu: The cpu that initiated the trace. |
| 480 | * |
| 481 | * Flip the buffers between the @tr and the max_tr and record information |
| 482 | * about which task was the cause of this latency. |
| 483 | */ |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 484 | void |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 485 | update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu) |
| 486 | { |
| 487 | struct trace_array_cpu *data; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 488 | int i; |
| 489 | |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 490 | WARN_ON_ONCE(!irqs_disabled()); |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 491 | __raw_spin_lock(&ftrace_max_lock); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 492 | /* clear out all the previous traces */ |
Steven Rostedt | ab46428 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 493 | for_each_tracing_cpu(i) { |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 494 | data = tr->data[i]; |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 495 | flip_trace(max_tr.data[i], data); |
Steven Rostedt | 89b2f97 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 496 | tracing_reset(data); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 497 | } |
| 498 | |
| 499 | __update_max_tr(tr, tsk, cpu); |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 500 | __raw_spin_unlock(&ftrace_max_lock); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 501 | } |
| 502 | |
| 503 | /** |
| 504 | * update_max_tr_single - only copy one trace over, and reset the rest |
| 505 | * @tr - tracer |
| 506 | * @tsk - task with the latency |
| 507 | * @cpu - the cpu of the buffer to copy. |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 508 | * |
| 509 | * 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] | 510 | */ |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 511 | void |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 512 | update_max_tr_single(struct trace_array *tr, struct task_struct *tsk, int cpu) |
| 513 | { |
| 514 | struct trace_array_cpu *data = tr->data[cpu]; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 515 | int i; |
| 516 | |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 517 | WARN_ON_ONCE(!irqs_disabled()); |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 518 | __raw_spin_lock(&ftrace_max_lock); |
Steven Rostedt | ab46428 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 519 | for_each_tracing_cpu(i) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 520 | tracing_reset(max_tr.data[i]); |
| 521 | |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 522 | flip_trace(max_tr.data[cpu], data); |
Steven Rostedt | 89b2f97 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 523 | tracing_reset(data); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 524 | |
| 525 | __update_max_tr(tr, tsk, cpu); |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 526 | __raw_spin_unlock(&ftrace_max_lock); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 527 | } |
| 528 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 529 | /** |
| 530 | * register_tracer - register a tracer with the ftrace system. |
| 531 | * @type - the plugin for the tracer |
| 532 | * |
| 533 | * Register a new plugin tracer. |
| 534 | */ |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 535 | int register_tracer(struct tracer *type) |
| 536 | { |
| 537 | struct tracer *t; |
| 538 | int len; |
| 539 | int ret = 0; |
| 540 | |
| 541 | if (!type->name) { |
| 542 | pr_info("Tracer must have a name\n"); |
| 543 | return -1; |
| 544 | } |
| 545 | |
| 546 | mutex_lock(&trace_types_lock); |
| 547 | for (t = trace_types; t; t = t->next) { |
| 548 | if (strcmp(type->name, t->name) == 0) { |
| 549 | /* already found */ |
| 550 | pr_info("Trace %s already registered\n", |
| 551 | type->name); |
| 552 | ret = -1; |
| 553 | goto out; |
| 554 | } |
| 555 | } |
| 556 | |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 557 | #ifdef CONFIG_FTRACE_STARTUP_TEST |
| 558 | if (type->selftest) { |
| 559 | struct tracer *saved_tracer = current_trace; |
| 560 | struct trace_array_cpu *data; |
| 561 | struct trace_array *tr = &global_trace; |
| 562 | int saved_ctrl = tr->ctrl; |
| 563 | int i; |
| 564 | /* |
| 565 | * Run a selftest on this tracer. |
| 566 | * Here we reset the trace buffer, and set the current |
| 567 | * tracer to be this tracer. The tracer can then run some |
| 568 | * internal tracing to verify that everything is in order. |
| 569 | * If we fail, we do not register this tracer. |
| 570 | */ |
Steven Rostedt | ab46428 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 571 | for_each_tracing_cpu(i) { |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 572 | data = tr->data[i]; |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 573 | if (!head_page(data)) |
| 574 | continue; |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 575 | tracing_reset(data); |
| 576 | } |
| 577 | current_trace = type; |
| 578 | tr->ctrl = 0; |
| 579 | /* the test is responsible for initializing and enabling */ |
| 580 | pr_info("Testing tracer %s: ", type->name); |
| 581 | ret = type->selftest(type, tr); |
| 582 | /* the test is responsible for resetting too */ |
| 583 | current_trace = saved_tracer; |
| 584 | tr->ctrl = saved_ctrl; |
| 585 | if (ret) { |
| 586 | printk(KERN_CONT "FAILED!\n"); |
| 587 | goto out; |
| 588 | } |
Steven Rostedt | 1d4db00 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 589 | /* Only reset on passing, to avoid touching corrupted buffers */ |
Steven Rostedt | ab46428 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 590 | for_each_tracing_cpu(i) { |
Steven Rostedt | 1d4db00 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 591 | data = tr->data[i]; |
| 592 | if (!head_page(data)) |
| 593 | continue; |
| 594 | tracing_reset(data); |
| 595 | } |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 596 | printk(KERN_CONT "PASSED\n"); |
| 597 | } |
| 598 | #endif |
| 599 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 600 | type->next = trace_types; |
| 601 | trace_types = type; |
| 602 | len = strlen(type->name); |
| 603 | if (len > max_tracer_type_len) |
| 604 | max_tracer_type_len = len; |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 605 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 606 | out: |
| 607 | mutex_unlock(&trace_types_lock); |
| 608 | |
| 609 | return ret; |
| 610 | } |
| 611 | |
| 612 | void unregister_tracer(struct tracer *type) |
| 613 | { |
| 614 | struct tracer **t; |
| 615 | int len; |
| 616 | |
| 617 | mutex_lock(&trace_types_lock); |
| 618 | for (t = &trace_types; *t; t = &(*t)->next) { |
| 619 | if (*t == type) |
| 620 | goto found; |
| 621 | } |
| 622 | pr_info("Trace %s not registered\n", type->name); |
| 623 | goto out; |
| 624 | |
| 625 | found: |
| 626 | *t = (*t)->next; |
| 627 | if (strlen(type->name) != max_tracer_type_len) |
| 628 | goto out; |
| 629 | |
| 630 | max_tracer_type_len = 0; |
| 631 | for (t = &trace_types; *t; t = &(*t)->next) { |
| 632 | len = strlen((*t)->name); |
| 633 | if (len > max_tracer_type_len) |
| 634 | max_tracer_type_len = len; |
| 635 | } |
| 636 | out: |
| 637 | mutex_unlock(&trace_types_lock); |
| 638 | } |
| 639 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 640 | void tracing_reset(struct trace_array_cpu *data) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 641 | { |
| 642 | data->trace_idx = 0; |
Steven Rostedt | 53d0aa7 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 643 | data->overrun = 0; |
Steven Rostedt | 93a588f | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 644 | data->trace_head = data->trace_tail = head_page(data); |
| 645 | data->trace_head_idx = 0; |
| 646 | data->trace_tail_idx = 0; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 647 | } |
| 648 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 649 | #define SAVED_CMDLINES 128 |
| 650 | static unsigned map_pid_to_cmdline[PID_MAX_DEFAULT+1]; |
| 651 | static unsigned map_cmdline_to_pid[SAVED_CMDLINES]; |
| 652 | static char saved_cmdlines[SAVED_CMDLINES][TASK_COMM_LEN]; |
| 653 | static int cmdline_idx; |
| 654 | static DEFINE_SPINLOCK(trace_cmdline_lock); |
Steven Rostedt | 25b0b44 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 655 | |
Steven Rostedt | 25b0b44 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 656 | /* temporary disable recording */ |
| 657 | atomic_t trace_record_cmdline_disabled __read_mostly; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 658 | |
| 659 | static void trace_init_cmdlines(void) |
| 660 | { |
| 661 | memset(&map_pid_to_cmdline, -1, sizeof(map_pid_to_cmdline)); |
| 662 | memset(&map_cmdline_to_pid, -1, sizeof(map_cmdline_to_pid)); |
| 663 | cmdline_idx = 0; |
| 664 | } |
| 665 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 666 | void trace_stop_cmdline_recording(void); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 667 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 668 | static void trace_save_cmdline(struct task_struct *tsk) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 669 | { |
| 670 | unsigned map; |
| 671 | unsigned idx; |
| 672 | |
| 673 | if (!tsk->pid || unlikely(tsk->pid > PID_MAX_DEFAULT)) |
| 674 | return; |
| 675 | |
| 676 | /* |
| 677 | * It's not the end of the world if we don't get |
| 678 | * the lock, but we also don't want to spin |
| 679 | * nor do we want to disable interrupts, |
| 680 | * so if we miss here, then better luck next time. |
| 681 | */ |
| 682 | if (!spin_trylock(&trace_cmdline_lock)) |
| 683 | return; |
| 684 | |
| 685 | idx = map_pid_to_cmdline[tsk->pid]; |
| 686 | if (idx >= SAVED_CMDLINES) { |
| 687 | idx = (cmdline_idx + 1) % SAVED_CMDLINES; |
| 688 | |
| 689 | map = map_cmdline_to_pid[idx]; |
| 690 | if (map <= PID_MAX_DEFAULT) |
| 691 | map_pid_to_cmdline[map] = (unsigned)-1; |
| 692 | |
| 693 | map_pid_to_cmdline[tsk->pid] = idx; |
| 694 | |
| 695 | cmdline_idx = idx; |
| 696 | } |
| 697 | |
| 698 | memcpy(&saved_cmdlines[idx], tsk->comm, TASK_COMM_LEN); |
| 699 | |
| 700 | spin_unlock(&trace_cmdline_lock); |
| 701 | } |
| 702 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 703 | static char *trace_find_cmdline(int pid) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 704 | { |
| 705 | char *cmdline = "<...>"; |
| 706 | unsigned map; |
| 707 | |
| 708 | if (!pid) |
| 709 | return "<idle>"; |
| 710 | |
| 711 | if (pid > PID_MAX_DEFAULT) |
| 712 | goto out; |
| 713 | |
| 714 | map = map_pid_to_cmdline[pid]; |
| 715 | if (map >= SAVED_CMDLINES) |
| 716 | goto out; |
| 717 | |
| 718 | cmdline = saved_cmdlines[map]; |
| 719 | |
| 720 | out: |
| 721 | return cmdline; |
| 722 | } |
| 723 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 724 | void tracing_record_cmdline(struct task_struct *tsk) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 725 | { |
| 726 | if (atomic_read(&trace_record_cmdline_disabled)) |
| 727 | return; |
| 728 | |
| 729 | trace_save_cmdline(tsk); |
| 730 | } |
| 731 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 732 | static inline struct list_head * |
Steven Rostedt | 93a588f | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 733 | trace_next_list(struct trace_array_cpu *data, struct list_head *next) |
| 734 | { |
| 735 | /* |
| 736 | * Roundrobin - but skip the head (which is not a real page): |
| 737 | */ |
| 738 | next = next->next; |
| 739 | if (unlikely(next == &data->trace_pages)) |
| 740 | next = next->next; |
| 741 | BUG_ON(next == &data->trace_pages); |
| 742 | |
| 743 | return next; |
| 744 | } |
| 745 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 746 | static inline void * |
Steven Rostedt | 93a588f | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 747 | trace_next_page(struct trace_array_cpu *data, void *addr) |
| 748 | { |
| 749 | struct list_head *next; |
| 750 | struct page *page; |
| 751 | |
| 752 | page = virt_to_page(addr); |
| 753 | |
| 754 | next = trace_next_list(data, &page->lru); |
| 755 | page = list_entry(next, struct page, lru); |
| 756 | |
| 757 | return page_address(page); |
| 758 | } |
| 759 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 760 | static inline struct trace_entry * |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 761 | 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] | 762 | { |
| 763 | unsigned long idx, idx_next; |
| 764 | struct trace_entry *entry; |
| 765 | |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 766 | data->trace_idx++; |
Steven Rostedt | 93a588f | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 767 | idx = data->trace_head_idx; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 768 | idx_next = idx + 1; |
| 769 | |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 770 | BUG_ON(idx * TRACE_ENTRY_SIZE >= PAGE_SIZE); |
| 771 | |
Steven Rostedt | 93a588f | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 772 | entry = data->trace_head + idx * TRACE_ENTRY_SIZE; |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 773 | |
| 774 | if (unlikely(idx_next >= ENTRIES_PER_PAGE)) { |
Steven Rostedt | 93a588f | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 775 | data->trace_head = trace_next_page(data, data->trace_head); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 776 | idx_next = 0; |
| 777 | } |
| 778 | |
Steven Rostedt | 93a588f | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 779 | if (data->trace_head == data->trace_tail && |
| 780 | idx_next == data->trace_tail_idx) { |
| 781 | /* overrun */ |
Steven Rostedt | 53d0aa7 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 782 | data->overrun++; |
Steven Rostedt | 93a588f | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 783 | data->trace_tail_idx++; |
| 784 | if (data->trace_tail_idx >= ENTRIES_PER_PAGE) { |
| 785 | data->trace_tail = |
| 786 | trace_next_page(data, data->trace_tail); |
| 787 | data->trace_tail_idx = 0; |
| 788 | } |
| 789 | } |
| 790 | |
| 791 | data->trace_head_idx = idx_next; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 792 | |
| 793 | return entry; |
| 794 | } |
| 795 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 796 | static inline void |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 797 | tracing_generic_entry_update(struct trace_entry *entry, unsigned long flags) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 798 | { |
| 799 | struct task_struct *tsk = current; |
| 800 | unsigned long pc; |
| 801 | |
| 802 | pc = preempt_count(); |
| 803 | |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 804 | entry->preempt_count = pc & 0xff; |
Thomas Gleixner | 72829bc | 2008-05-23 21:37:28 +0200 | [diff] [blame] | 805 | entry->pid = (tsk) ? tsk->pid : 0; |
Ingo Molnar | 750ed1a | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 806 | entry->t = ftrace_now(raw_smp_processor_id()); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 807 | entry->flags = (irqs_disabled_flags(flags) ? TRACE_FLAG_IRQS_OFF : 0) | |
| 808 | ((pc & HARDIRQ_MASK) ? TRACE_FLAG_HARDIRQ : 0) | |
| 809 | ((pc & SOFTIRQ_MASK) ? TRACE_FLAG_SOFTIRQ : 0) | |
| 810 | (need_resched() ? TRACE_FLAG_NEED_RESCHED : 0); |
| 811 | } |
| 812 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 813 | void |
Steven Rostedt | 6fb44b7 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 814 | trace_function(struct trace_array *tr, struct trace_array_cpu *data, |
| 815 | unsigned long ip, unsigned long parent_ip, unsigned long flags) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 816 | { |
| 817 | struct trace_entry *entry; |
Ingo Molnar | dcb6308 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 818 | unsigned long irq_flags; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 819 | |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 820 | raw_local_irq_save(irq_flags); |
| 821 | __raw_spin_lock(&data->lock); |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 822 | entry = tracing_get_trace_entry(tr, data); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 823 | tracing_generic_entry_update(entry, flags); |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 824 | entry->type = TRACE_FN; |
| 825 | entry->fn.ip = ip; |
| 826 | entry->fn.parent_ip = parent_ip; |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 827 | __raw_spin_unlock(&data->lock); |
| 828 | raw_local_irq_restore(irq_flags); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 829 | } |
| 830 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 831 | void |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 832 | ftrace(struct trace_array *tr, struct trace_array_cpu *data, |
| 833 | unsigned long ip, unsigned long parent_ip, unsigned long flags) |
| 834 | { |
| 835 | if (likely(!atomic_read(&data->disabled))) |
Steven Rostedt | 6fb44b7 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 836 | trace_function(tr, data, ip, parent_ip, flags); |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 837 | } |
| 838 | |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 839 | void __trace_stack(struct trace_array *tr, |
| 840 | struct trace_array_cpu *data, |
| 841 | unsigned long flags, |
| 842 | int skip) |
| 843 | { |
| 844 | struct trace_entry *entry; |
| 845 | struct stack_trace trace; |
| 846 | |
| 847 | if (!(trace_flags & TRACE_ITER_STACKTRACE)) |
| 848 | return; |
| 849 | |
| 850 | entry = tracing_get_trace_entry(tr, data); |
| 851 | tracing_generic_entry_update(entry, flags); |
| 852 | entry->type = TRACE_STACK; |
| 853 | |
| 854 | memset(&entry->stack, 0, sizeof(entry->stack)); |
| 855 | |
| 856 | trace.nr_entries = 0; |
| 857 | trace.max_entries = FTRACE_STACK_ENTRIES; |
| 858 | trace.skip = skip; |
| 859 | trace.entries = entry->stack.caller; |
| 860 | |
| 861 | save_stack_trace(&trace); |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 862 | } |
| 863 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 864 | void |
Ingo Molnar | a4feb83 | 2008-05-12 21:21:02 +0200 | [diff] [blame] | 865 | __trace_special(void *__tr, void *__data, |
| 866 | unsigned long arg1, unsigned long arg2, unsigned long arg3) |
| 867 | { |
| 868 | struct trace_array_cpu *data = __data; |
| 869 | struct trace_array *tr = __tr; |
| 870 | struct trace_entry *entry; |
| 871 | unsigned long irq_flags; |
| 872 | |
| 873 | raw_local_irq_save(irq_flags); |
| 874 | __raw_spin_lock(&data->lock); |
| 875 | entry = tracing_get_trace_entry(tr, data); |
| 876 | tracing_generic_entry_update(entry, 0); |
| 877 | entry->type = TRACE_SPECIAL; |
| 878 | entry->special.arg1 = arg1; |
| 879 | entry->special.arg2 = arg2; |
| 880 | entry->special.arg3 = arg3; |
| 881 | __trace_stack(tr, data, irq_flags, 4); |
| 882 | __raw_spin_unlock(&data->lock); |
| 883 | raw_local_irq_restore(irq_flags); |
| 884 | |
| 885 | trace_wake_up(); |
| 886 | } |
| 887 | |
| 888 | void |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 889 | tracing_sched_switch_trace(struct trace_array *tr, |
| 890 | struct trace_array_cpu *data, |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 891 | struct task_struct *prev, |
| 892 | struct task_struct *next, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 893 | unsigned long flags) |
| 894 | { |
| 895 | struct trace_entry *entry; |
Ingo Molnar | dcb6308 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 896 | unsigned long irq_flags; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 897 | |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 898 | raw_local_irq_save(irq_flags); |
| 899 | __raw_spin_lock(&data->lock); |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 900 | entry = tracing_get_trace_entry(tr, data); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 901 | tracing_generic_entry_update(entry, flags); |
| 902 | entry->type = TRACE_CTX; |
| 903 | entry->ctx.prev_pid = prev->pid; |
| 904 | entry->ctx.prev_prio = prev->prio; |
| 905 | entry->ctx.prev_state = prev->state; |
| 906 | entry->ctx.next_pid = next->pid; |
| 907 | entry->ctx.next_prio = next->prio; |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 908 | entry->ctx.next_state = next->state; |
Ingo Molnar | 74f4e36 | 2008-05-12 21:21:15 +0200 | [diff] [blame] | 909 | __trace_stack(tr, data, flags, 5); |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 910 | __raw_spin_unlock(&data->lock); |
| 911 | raw_local_irq_restore(irq_flags); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 912 | } |
| 913 | |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 914 | void |
| 915 | tracing_sched_wakeup_trace(struct trace_array *tr, |
| 916 | struct trace_array_cpu *data, |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 917 | struct task_struct *wakee, |
| 918 | struct task_struct *curr, |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 919 | unsigned long flags) |
| 920 | { |
| 921 | struct trace_entry *entry; |
| 922 | unsigned long irq_flags; |
| 923 | |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 924 | raw_local_irq_save(irq_flags); |
| 925 | __raw_spin_lock(&data->lock); |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 926 | entry = tracing_get_trace_entry(tr, data); |
| 927 | tracing_generic_entry_update(entry, flags); |
| 928 | entry->type = TRACE_WAKE; |
| 929 | entry->ctx.prev_pid = curr->pid; |
| 930 | entry->ctx.prev_prio = curr->prio; |
| 931 | entry->ctx.prev_state = curr->state; |
| 932 | entry->ctx.next_pid = wakee->pid; |
| 933 | entry->ctx.next_prio = wakee->prio; |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 934 | entry->ctx.next_state = wakee->state; |
Ingo Molnar | 74f4e36 | 2008-05-12 21:21:15 +0200 | [diff] [blame] | 935 | __trace_stack(tr, data, flags, 6); |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 936 | __raw_spin_unlock(&data->lock); |
| 937 | raw_local_irq_restore(irq_flags); |
Ingo Molnar | 017730c | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 938 | |
| 939 | trace_wake_up(); |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 940 | } |
| 941 | |
Steven Rostedt | 4902f88 | 2008-05-22 00:22:18 -0400 | [diff] [blame] | 942 | void |
| 943 | ftrace_special(unsigned long arg1, unsigned long arg2, unsigned long arg3) |
| 944 | { |
| 945 | struct trace_array *tr = &global_trace; |
| 946 | struct trace_array_cpu *data; |
| 947 | unsigned long flags; |
| 948 | long disabled; |
| 949 | int cpu; |
| 950 | |
| 951 | if (tracing_disabled || current_trace == &no_tracer || !tr->ctrl) |
| 952 | return; |
| 953 | |
| 954 | local_irq_save(flags); |
| 955 | cpu = raw_smp_processor_id(); |
| 956 | data = tr->data[cpu]; |
| 957 | disabled = atomic_inc_return(&data->disabled); |
| 958 | |
| 959 | if (likely(disabled == 1)) |
| 960 | __trace_special(tr, data, arg1, arg2, arg3); |
| 961 | |
| 962 | atomic_dec(&data->disabled); |
| 963 | local_irq_restore(flags); |
| 964 | } |
| 965 | |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 966 | #ifdef CONFIG_FTRACE |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 967 | static void |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 968 | function_trace_call(unsigned long ip, unsigned long parent_ip) |
| 969 | { |
| 970 | struct trace_array *tr = &global_trace; |
| 971 | struct trace_array_cpu *data; |
| 972 | unsigned long flags; |
| 973 | long disabled; |
| 974 | int cpu; |
| 975 | |
| 976 | if (unlikely(!tracer_enabled)) |
| 977 | return; |
| 978 | |
| 979 | local_irq_save(flags); |
| 980 | cpu = raw_smp_processor_id(); |
| 981 | data = tr->data[cpu]; |
| 982 | disabled = atomic_inc_return(&data->disabled); |
| 983 | |
| 984 | if (likely(disabled == 1)) |
Steven Rostedt | 6fb44b7 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 985 | trace_function(tr, data, ip, parent_ip, flags); |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 986 | |
| 987 | atomic_dec(&data->disabled); |
| 988 | local_irq_restore(flags); |
| 989 | } |
| 990 | |
| 991 | static struct ftrace_ops trace_ops __read_mostly = |
| 992 | { |
| 993 | .func = function_trace_call, |
| 994 | }; |
| 995 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 996 | void tracing_start_function_trace(void) |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 997 | { |
| 998 | register_ftrace_function(&trace_ops); |
| 999 | } |
| 1000 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1001 | void tracing_stop_function_trace(void) |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1002 | { |
| 1003 | unregister_ftrace_function(&trace_ops); |
| 1004 | } |
| 1005 | #endif |
| 1006 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1007 | enum trace_file_type { |
| 1008 | TRACE_FILE_LAT_FMT = 1, |
| 1009 | }; |
| 1010 | |
| 1011 | static struct trace_entry * |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1012 | trace_entry_idx(struct trace_array *tr, struct trace_array_cpu *data, |
| 1013 | struct trace_iterator *iter, int cpu) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1014 | { |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1015 | struct page *page; |
| 1016 | struct trace_entry *array; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1017 | |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1018 | if (iter->next_idx[cpu] >= tr->entries || |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1019 | iter->next_idx[cpu] >= data->trace_idx || |
| 1020 | (data->trace_head == data->trace_tail && |
| 1021 | data->trace_head_idx == data->trace_tail_idx)) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1022 | return NULL; |
| 1023 | |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1024 | if (!iter->next_page[cpu]) { |
Steven Rostedt | 93a588f | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 1025 | /* Initialize the iterator for this cpu trace buffer */ |
| 1026 | WARN_ON(!data->trace_tail); |
| 1027 | page = virt_to_page(data->trace_tail); |
| 1028 | iter->next_page[cpu] = &page->lru; |
| 1029 | iter->next_page_idx[cpu] = data->trace_tail_idx; |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1030 | } |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1031 | |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1032 | page = list_entry(iter->next_page[cpu], struct page, lru); |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 1033 | BUG_ON(&data->trace_pages == &page->lru); |
| 1034 | |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1035 | array = page_address(page); |
| 1036 | |
Steven Rostedt | 93a588f | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 1037 | WARN_ON(iter->next_page_idx[cpu] >= ENTRIES_PER_PAGE); |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1038 | return &array[iter->next_page_idx[cpu]]; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1039 | } |
| 1040 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1041 | static struct trace_entry * |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1042 | find_next_entry(struct trace_iterator *iter, int *ent_cpu) |
| 1043 | { |
| 1044 | struct trace_array *tr = iter->tr; |
| 1045 | struct trace_entry *ent, *next = NULL; |
| 1046 | int next_cpu = -1; |
| 1047 | int cpu; |
| 1048 | |
Steven Rostedt | ab46428 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 1049 | for_each_tracing_cpu(cpu) { |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 1050 | if (!head_page(tr->data[cpu])) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1051 | continue; |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1052 | ent = trace_entry_idx(tr, tr->data[cpu], iter, cpu); |
Ingo Molnar | cdd31cd | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1053 | /* |
| 1054 | * Pick the entry with the smallest timestamp: |
| 1055 | */ |
| 1056 | if (ent && (!next || ent->t < next->t)) { |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1057 | next = ent; |
| 1058 | next_cpu = cpu; |
| 1059 | } |
| 1060 | } |
| 1061 | |
| 1062 | if (ent_cpu) |
| 1063 | *ent_cpu = next_cpu; |
| 1064 | |
| 1065 | return next; |
| 1066 | } |
| 1067 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1068 | static void trace_iterator_increment(struct trace_iterator *iter) |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1069 | { |
| 1070 | iter->idx++; |
| 1071 | iter->next_idx[iter->cpu]++; |
| 1072 | iter->next_page_idx[iter->cpu]++; |
Ingo Molnar | 8c523a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1073 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1074 | if (iter->next_page_idx[iter->cpu] >= ENTRIES_PER_PAGE) { |
| 1075 | struct trace_array_cpu *data = iter->tr->data[iter->cpu]; |
| 1076 | |
| 1077 | iter->next_page_idx[iter->cpu] = 0; |
| 1078 | iter->next_page[iter->cpu] = |
| 1079 | trace_next_list(data, iter->next_page[iter->cpu]); |
| 1080 | } |
| 1081 | } |
| 1082 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1083 | static void trace_consume(struct trace_iterator *iter) |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1084 | { |
| 1085 | struct trace_array_cpu *data = iter->tr->data[iter->cpu]; |
| 1086 | |
| 1087 | data->trace_tail_idx++; |
| 1088 | if (data->trace_tail_idx >= ENTRIES_PER_PAGE) { |
| 1089 | data->trace_tail = trace_next_page(data, data->trace_tail); |
| 1090 | data->trace_tail_idx = 0; |
| 1091 | } |
| 1092 | |
| 1093 | /* Check if we empty it, then reset the index */ |
| 1094 | if (data->trace_head == data->trace_tail && |
| 1095 | data->trace_head_idx == data->trace_tail_idx) |
| 1096 | data->trace_idx = 0; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1097 | } |
| 1098 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1099 | static void *find_next_entry_inc(struct trace_iterator *iter) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1100 | { |
| 1101 | struct trace_entry *next; |
| 1102 | int next_cpu = -1; |
| 1103 | |
| 1104 | next = find_next_entry(iter, &next_cpu); |
| 1105 | |
Ingo Molnar | 4e3c333 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 1106 | iter->prev_ent = iter->ent; |
| 1107 | iter->prev_cpu = iter->cpu; |
| 1108 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1109 | iter->ent = next; |
| 1110 | iter->cpu = next_cpu; |
| 1111 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1112 | if (next) |
| 1113 | trace_iterator_increment(iter); |
| 1114 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1115 | return next ? iter : NULL; |
| 1116 | } |
| 1117 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1118 | 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] | 1119 | { |
| 1120 | struct trace_iterator *iter = m->private; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1121 | void *last_ent = iter->ent; |
| 1122 | int i = (int)*pos; |
Ingo Molnar | 4e3c333 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 1123 | void *ent; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1124 | |
| 1125 | (*pos)++; |
| 1126 | |
| 1127 | /* can't go backwards */ |
| 1128 | if (iter->idx > i) |
| 1129 | return NULL; |
| 1130 | |
| 1131 | if (iter->idx < 0) |
| 1132 | ent = find_next_entry_inc(iter); |
| 1133 | else |
| 1134 | ent = iter; |
| 1135 | |
| 1136 | while (ent && iter->idx < i) |
| 1137 | ent = find_next_entry_inc(iter); |
| 1138 | |
| 1139 | iter->pos = *pos; |
| 1140 | |
| 1141 | if (last_ent && !ent) |
| 1142 | seq_puts(m, "\n\nvim:ft=help\n"); |
| 1143 | |
| 1144 | return ent; |
| 1145 | } |
| 1146 | |
| 1147 | static void *s_start(struct seq_file *m, loff_t *pos) |
| 1148 | { |
| 1149 | struct trace_iterator *iter = m->private; |
| 1150 | void *p = NULL; |
| 1151 | loff_t l = 0; |
| 1152 | int i; |
| 1153 | |
| 1154 | mutex_lock(&trace_types_lock); |
| 1155 | |
Steven Rostedt | d15f57f | 2008-05-12 21:20:56 +0200 | [diff] [blame] | 1156 | if (!current_trace || current_trace != iter->trace) { |
| 1157 | mutex_unlock(&trace_types_lock); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1158 | return NULL; |
Steven Rostedt | d15f57f | 2008-05-12 21:20:56 +0200 | [diff] [blame] | 1159 | } |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1160 | |
| 1161 | atomic_inc(&trace_record_cmdline_disabled); |
| 1162 | |
| 1163 | /* let the tracer grab locks here if needed */ |
| 1164 | if (current_trace->start) |
| 1165 | current_trace->start(iter); |
| 1166 | |
| 1167 | if (*pos != iter->pos) { |
| 1168 | iter->ent = NULL; |
| 1169 | iter->cpu = 0; |
| 1170 | iter->idx = -1; |
Ingo Molnar | 4e3c333 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 1171 | iter->prev_ent = NULL; |
| 1172 | iter->prev_cpu = -1; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1173 | |
Steven Rostedt | ab46428 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 1174 | for_each_tracing_cpu(i) { |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1175 | iter->next_idx[i] = 0; |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1176 | iter->next_page[i] = NULL; |
| 1177 | } |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1178 | |
| 1179 | for (p = iter; p && l < *pos; p = s_next(m, p, &l)) |
| 1180 | ; |
| 1181 | |
| 1182 | } else { |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1183 | l = *pos - 1; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1184 | p = s_next(m, p, &l); |
| 1185 | } |
| 1186 | |
| 1187 | return p; |
| 1188 | } |
| 1189 | |
| 1190 | static void s_stop(struct seq_file *m, void *p) |
| 1191 | { |
| 1192 | struct trace_iterator *iter = m->private; |
| 1193 | |
| 1194 | atomic_dec(&trace_record_cmdline_disabled); |
| 1195 | |
| 1196 | /* let the tracer release locks here if needed */ |
| 1197 | if (current_trace && current_trace == iter->trace && iter->trace->stop) |
| 1198 | iter->trace->stop(iter); |
| 1199 | |
| 1200 | mutex_unlock(&trace_types_lock); |
| 1201 | } |
| 1202 | |
Abhishek Sagar | 76094a2 | 2008-05-28 00:03:18 +0530 | [diff] [blame^] | 1203 | #define KRETPROBE_MSG "[unknown/kretprobe'd]" |
| 1204 | |
| 1205 | #ifdef CONFIG_KRETPROBES |
| 1206 | static inline int kretprobed(unsigned long addr) |
| 1207 | { |
| 1208 | return addr == (unsigned long)kretprobe_trampoline; |
| 1209 | } |
| 1210 | #else |
| 1211 | static inline int kretprobed(unsigned long addr) |
| 1212 | { |
| 1213 | return 0; |
| 1214 | } |
| 1215 | #endif /* CONFIG_KRETPROBES */ |
| 1216 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1217 | static int |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1218 | 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] | 1219 | { |
| 1220 | #ifdef CONFIG_KALLSYMS |
| 1221 | char str[KSYM_SYMBOL_LEN]; |
| 1222 | |
| 1223 | kallsyms_lookup(address, NULL, NULL, NULL, str); |
| 1224 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1225 | return trace_seq_printf(s, fmt, str); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1226 | #endif |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1227 | return 1; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1228 | } |
| 1229 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1230 | static int |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1231 | seq_print_sym_offset(struct trace_seq *s, const char *fmt, |
| 1232 | unsigned long address) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1233 | { |
| 1234 | #ifdef CONFIG_KALLSYMS |
| 1235 | char str[KSYM_SYMBOL_LEN]; |
| 1236 | |
| 1237 | sprint_symbol(str, address); |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1238 | return trace_seq_printf(s, fmt, str); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1239 | #endif |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1240 | return 1; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1241 | } |
| 1242 | |
| 1243 | #ifndef CONFIG_64BIT |
| 1244 | # define IP_FMT "%08lx" |
| 1245 | #else |
| 1246 | # define IP_FMT "%016lx" |
| 1247 | #endif |
| 1248 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1249 | static int |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1250 | 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] | 1251 | { |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1252 | int ret; |
| 1253 | |
| 1254 | if (!ip) |
| 1255 | return trace_seq_printf(s, "0"); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1256 | |
| 1257 | if (sym_flags & TRACE_ITER_SYM_OFFSET) |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1258 | ret = seq_print_sym_offset(s, "%s", ip); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1259 | else |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1260 | ret = seq_print_sym_short(s, "%s", ip); |
| 1261 | |
| 1262 | if (!ret) |
| 1263 | return 0; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1264 | |
| 1265 | if (sym_flags & TRACE_ITER_SYM_ADDR) |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1266 | ret = trace_seq_printf(s, " <" IP_FMT ">", ip); |
| 1267 | return ret; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1268 | } |
| 1269 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1270 | static void print_lat_help_header(struct seq_file *m) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1271 | { |
| 1272 | seq_puts(m, "# _------=> CPU# \n"); |
| 1273 | seq_puts(m, "# / _-----=> irqs-off \n"); |
| 1274 | seq_puts(m, "# | / _----=> need-resched \n"); |
| 1275 | seq_puts(m, "# || / _---=> hardirq/softirq \n"); |
| 1276 | seq_puts(m, "# ||| / _--=> preempt-depth \n"); |
| 1277 | seq_puts(m, "# |||| / \n"); |
| 1278 | seq_puts(m, "# ||||| delay \n"); |
| 1279 | seq_puts(m, "# cmd pid ||||| time | caller \n"); |
| 1280 | seq_puts(m, "# \\ / ||||| \\ | / \n"); |
| 1281 | } |
| 1282 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1283 | static void print_func_help_header(struct seq_file *m) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1284 | { |
| 1285 | seq_puts(m, "# TASK-PID CPU# TIMESTAMP FUNCTION\n"); |
| 1286 | seq_puts(m, "# | | | | |\n"); |
| 1287 | } |
| 1288 | |
| 1289 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1290 | static void |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1291 | print_trace_header(struct seq_file *m, struct trace_iterator *iter) |
| 1292 | { |
| 1293 | unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK); |
| 1294 | struct trace_array *tr = iter->tr; |
| 1295 | struct trace_array_cpu *data = tr->data[tr->cpu]; |
| 1296 | struct tracer *type = current_trace; |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1297 | unsigned long total = 0; |
| 1298 | unsigned long entries = 0; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1299 | int cpu; |
| 1300 | const char *name = "preemption"; |
| 1301 | |
| 1302 | if (type) |
| 1303 | name = type->name; |
| 1304 | |
Steven Rostedt | ab46428 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 1305 | for_each_tracing_cpu(cpu) { |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 1306 | if (head_page(tr->data[cpu])) { |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1307 | total += tr->data[cpu]->trace_idx; |
| 1308 | if (tr->data[cpu]->trace_idx > tr->entries) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1309 | entries += tr->entries; |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1310 | else |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1311 | entries += tr->data[cpu]->trace_idx; |
| 1312 | } |
| 1313 | } |
| 1314 | |
| 1315 | seq_printf(m, "%s latency trace v1.1.5 on %s\n", |
| 1316 | name, UTS_RELEASE); |
| 1317 | seq_puts(m, "-----------------------------------" |
| 1318 | "---------------------------------\n"); |
| 1319 | seq_printf(m, " latency: %lu us, #%lu/%lu, CPU#%d |" |
| 1320 | " (M:%s VP:%d, KP:%d, SP:%d HP:%d", |
Steven Rostedt | 57f50be | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 1321 | nsecs_to_usecs(data->saved_latency), |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1322 | entries, |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1323 | total, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1324 | tr->cpu, |
| 1325 | #if defined(CONFIG_PREEMPT_NONE) |
| 1326 | "server", |
| 1327 | #elif defined(CONFIG_PREEMPT_VOLUNTARY) |
| 1328 | "desktop", |
| 1329 | #elif defined(CONFIG_PREEMPT_DESKTOP) |
| 1330 | "preempt", |
| 1331 | #else |
| 1332 | "unknown", |
| 1333 | #endif |
| 1334 | /* These are reserved for later use */ |
| 1335 | 0, 0, 0, 0); |
| 1336 | #ifdef CONFIG_SMP |
| 1337 | seq_printf(m, " #P:%d)\n", num_online_cpus()); |
| 1338 | #else |
| 1339 | seq_puts(m, ")\n"); |
| 1340 | #endif |
| 1341 | seq_puts(m, " -----------------\n"); |
| 1342 | seq_printf(m, " | task: %.16s-%d " |
| 1343 | "(uid:%d nice:%ld policy:%ld rt_prio:%ld)\n", |
| 1344 | data->comm, data->pid, data->uid, data->nice, |
| 1345 | data->policy, data->rt_priority); |
| 1346 | seq_puts(m, " -----------------\n"); |
| 1347 | |
| 1348 | if (data->critical_start) { |
| 1349 | seq_puts(m, " => started at: "); |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1350 | seq_print_ip_sym(&iter->seq, data->critical_start, sym_flags); |
| 1351 | trace_print_seq(m, &iter->seq); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1352 | seq_puts(m, "\n => ended at: "); |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1353 | seq_print_ip_sym(&iter->seq, data->critical_end, sym_flags); |
| 1354 | trace_print_seq(m, &iter->seq); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1355 | seq_puts(m, "\n"); |
| 1356 | } |
| 1357 | |
| 1358 | seq_puts(m, "\n"); |
| 1359 | } |
| 1360 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1361 | static void |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1362 | 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] | 1363 | { |
| 1364 | int hardirq, softirq; |
| 1365 | char *comm; |
| 1366 | |
| 1367 | comm = trace_find_cmdline(entry->pid); |
| 1368 | |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1369 | trace_seq_printf(s, "%8.8s-%-5d ", comm, entry->pid); |
| 1370 | trace_seq_printf(s, "%d", cpu); |
| 1371 | trace_seq_printf(s, "%c%c", |
| 1372 | (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' : '.', |
| 1373 | ((entry->flags & TRACE_FLAG_NEED_RESCHED) ? 'N' : '.')); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1374 | |
| 1375 | hardirq = entry->flags & TRACE_FLAG_HARDIRQ; |
| 1376 | softirq = entry->flags & TRACE_FLAG_SOFTIRQ; |
Ingo Molnar | afc2abc | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 1377 | if (hardirq && softirq) { |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1378 | trace_seq_putc(s, 'H'); |
Ingo Molnar | afc2abc | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 1379 | } else { |
| 1380 | if (hardirq) { |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1381 | trace_seq_putc(s, 'h'); |
Ingo Molnar | afc2abc | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 1382 | } else { |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1383 | if (softirq) |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1384 | trace_seq_putc(s, 's'); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1385 | else |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1386 | trace_seq_putc(s, '.'); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1387 | } |
| 1388 | } |
| 1389 | |
| 1390 | if (entry->preempt_count) |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1391 | trace_seq_printf(s, "%x", entry->preempt_count); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1392 | else |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1393 | trace_seq_puts(s, "."); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1394 | } |
| 1395 | |
| 1396 | unsigned long preempt_mark_thresh = 100; |
| 1397 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1398 | static void |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1399 | lat_print_timestamp(struct trace_seq *s, unsigned long long abs_usecs, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1400 | unsigned long rel_usecs) |
| 1401 | { |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1402 | trace_seq_printf(s, " %4lldus", abs_usecs); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1403 | if (rel_usecs > preempt_mark_thresh) |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1404 | trace_seq_puts(s, "!: "); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1405 | else if (rel_usecs > 1) |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1406 | trace_seq_puts(s, "+: "); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1407 | else |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1408 | trace_seq_puts(s, " : "); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1409 | } |
| 1410 | |
| 1411 | static const char state_to_char[] = TASK_STATE_TO_CHAR_STR; |
| 1412 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1413 | static int |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1414 | 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] | 1415 | { |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1416 | struct trace_seq *s = &iter->seq; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1417 | unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK); |
| 1418 | struct trace_entry *next_entry = find_next_entry(iter, NULL); |
| 1419 | unsigned long verbose = (trace_flags & TRACE_ITER_VERBOSE); |
| 1420 | struct trace_entry *entry = iter->ent; |
| 1421 | unsigned long abs_usecs; |
| 1422 | unsigned long rel_usecs; |
| 1423 | char *comm; |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1424 | int S, T; |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1425 | int i; |
Ankita Garg | d17d969 | 2008-05-12 21:20:58 +0200 | [diff] [blame] | 1426 | unsigned state; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1427 | |
| 1428 | if (!next_entry) |
| 1429 | next_entry = entry; |
| 1430 | rel_usecs = ns2usecs(next_entry->t - entry->t); |
| 1431 | abs_usecs = ns2usecs(entry->t - iter->tr->time_start); |
| 1432 | |
| 1433 | if (verbose) { |
| 1434 | comm = trace_find_cmdline(entry->pid); |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1435 | trace_seq_printf(s, "%16s %5d %d %d %08x %08x [%08lx]" |
| 1436 | " %ld.%03ldms (+%ld.%03ldms): ", |
| 1437 | comm, |
| 1438 | entry->pid, cpu, entry->flags, |
| 1439 | entry->preempt_count, trace_idx, |
| 1440 | ns2usecs(entry->t), |
| 1441 | abs_usecs/1000, |
| 1442 | abs_usecs % 1000, rel_usecs/1000, |
| 1443 | rel_usecs % 1000); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1444 | } else { |
Ingo Molnar | f29c73f | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1445 | lat_print_generic(s, entry, cpu); |
| 1446 | lat_print_timestamp(s, abs_usecs, rel_usecs); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1447 | } |
| 1448 | switch (entry->type) { |
| 1449 | case TRACE_FN: |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1450 | seq_print_ip_sym(s, entry->fn.ip, sym_flags); |
| 1451 | trace_seq_puts(s, " ("); |
Abhishek Sagar | 76094a2 | 2008-05-28 00:03:18 +0530 | [diff] [blame^] | 1452 | if (kretprobed(entry->fn.parent_ip)) |
| 1453 | trace_seq_puts(s, KRETPROBE_MSG); |
| 1454 | else |
| 1455 | seq_print_ip_sym(s, entry->fn.parent_ip, sym_flags); |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1456 | trace_seq_puts(s, ")\n"); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1457 | break; |
| 1458 | case TRACE_CTX: |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1459 | case TRACE_WAKE: |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1460 | T = entry->ctx.next_state < sizeof(state_to_char) ? |
| 1461 | state_to_char[entry->ctx.next_state] : 'X'; |
| 1462 | |
Ankita Garg | d17d969 | 2008-05-12 21:20:58 +0200 | [diff] [blame] | 1463 | state = entry->ctx.prev_state ? __ffs(entry->ctx.prev_state) + 1 : 0; |
| 1464 | S = state < sizeof(state_to_char) - 1 ? state_to_char[state] : 'X'; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1465 | comm = trace_find_cmdline(entry->ctx.next_pid); |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1466 | trace_seq_printf(s, " %5d:%3d:%c %s %5d:%3d:%c %s\n", |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1467 | entry->ctx.prev_pid, |
| 1468 | entry->ctx.prev_prio, |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1469 | S, entry->type == TRACE_CTX ? "==>" : " +", |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1470 | entry->ctx.next_pid, |
| 1471 | entry->ctx.next_prio, |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1472 | T, comm); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1473 | break; |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1474 | case TRACE_SPECIAL: |
Ingo Molnar | 88a4216 | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1475 | trace_seq_printf(s, "# %ld %ld %ld\n", |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1476 | entry->special.arg1, |
| 1477 | entry->special.arg2, |
| 1478 | entry->special.arg3); |
| 1479 | break; |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1480 | case TRACE_STACK: |
| 1481 | for (i = 0; i < FTRACE_STACK_ENTRIES; i++) { |
| 1482 | if (i) |
| 1483 | trace_seq_puts(s, " <= "); |
| 1484 | seq_print_ip_sym(s, entry->stack.caller[i], sym_flags); |
| 1485 | } |
| 1486 | trace_seq_puts(s, "\n"); |
| 1487 | break; |
Steven Rostedt | 89b2f97 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 1488 | default: |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1489 | trace_seq_printf(s, "Unknown type %d\n", entry->type); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1490 | } |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1491 | return 1; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1492 | } |
| 1493 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1494 | static int print_trace_fmt(struct trace_iterator *iter) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1495 | { |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1496 | struct trace_seq *s = &iter->seq; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1497 | unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK); |
Ingo Molnar | 4e3c333 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 1498 | struct trace_entry *entry; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1499 | unsigned long usec_rem; |
| 1500 | unsigned long long t; |
| 1501 | unsigned long secs; |
| 1502 | char *comm; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1503 | int ret; |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1504 | int S, T; |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1505 | int i; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1506 | |
Ingo Molnar | 4e3c333 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 1507 | entry = iter->ent; |
| 1508 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1509 | comm = trace_find_cmdline(iter->ent->pid); |
| 1510 | |
Ingo Molnar | cdd31cd | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1511 | t = ns2usecs(entry->t); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1512 | usec_rem = do_div(t, 1000000ULL); |
| 1513 | secs = (unsigned long)t; |
| 1514 | |
Ingo Molnar | f29c73f | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1515 | ret = trace_seq_printf(s, "%16s-%-5d ", comm, entry->pid); |
| 1516 | if (!ret) |
| 1517 | return 0; |
| 1518 | ret = trace_seq_printf(s, "[%02d] ", iter->cpu); |
| 1519 | if (!ret) |
| 1520 | return 0; |
| 1521 | ret = trace_seq_printf(s, "%5lu.%06lu: ", secs, usec_rem); |
| 1522 | if (!ret) |
| 1523 | return 0; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1524 | |
| 1525 | switch (entry->type) { |
| 1526 | case TRACE_FN: |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1527 | ret = seq_print_ip_sym(s, entry->fn.ip, sym_flags); |
| 1528 | if (!ret) |
| 1529 | return 0; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1530 | if ((sym_flags & TRACE_ITER_PRINT_PARENT) && |
| 1531 | entry->fn.parent_ip) { |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1532 | ret = trace_seq_printf(s, " <-"); |
| 1533 | if (!ret) |
| 1534 | return 0; |
Abhishek Sagar | 76094a2 | 2008-05-28 00:03:18 +0530 | [diff] [blame^] | 1535 | if (kretprobed(entry->fn.parent_ip)) |
| 1536 | ret = trace_seq_puts(s, KRETPROBE_MSG); |
| 1537 | else |
| 1538 | ret = seq_print_ip_sym(s, entry->fn.parent_ip, |
| 1539 | sym_flags); |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1540 | if (!ret) |
| 1541 | return 0; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1542 | } |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1543 | ret = trace_seq_printf(s, "\n"); |
| 1544 | if (!ret) |
| 1545 | return 0; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1546 | break; |
| 1547 | case TRACE_CTX: |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1548 | case TRACE_WAKE: |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1549 | S = entry->ctx.prev_state < sizeof(state_to_char) ? |
| 1550 | state_to_char[entry->ctx.prev_state] : 'X'; |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1551 | T = entry->ctx.next_state < sizeof(state_to_char) ? |
| 1552 | state_to_char[entry->ctx.next_state] : 'X'; |
| 1553 | ret = trace_seq_printf(s, " %5d:%3d:%c %s %5d:%3d:%c\n", |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1554 | entry->ctx.prev_pid, |
| 1555 | entry->ctx.prev_prio, |
| 1556 | S, |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1557 | entry->type == TRACE_CTX ? "==>" : " +", |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1558 | entry->ctx.next_pid, |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1559 | entry->ctx.next_prio, |
| 1560 | T); |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1561 | if (!ret) |
| 1562 | return 0; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1563 | break; |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1564 | case TRACE_SPECIAL: |
Ingo Molnar | 88a4216 | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1565 | ret = trace_seq_printf(s, "# %ld %ld %ld\n", |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1566 | entry->special.arg1, |
| 1567 | entry->special.arg2, |
| 1568 | entry->special.arg3); |
| 1569 | if (!ret) |
| 1570 | return 0; |
| 1571 | break; |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1572 | case TRACE_STACK: |
| 1573 | for (i = 0; i < FTRACE_STACK_ENTRIES; i++) { |
| 1574 | if (i) { |
| 1575 | ret = trace_seq_puts(s, " <= "); |
| 1576 | if (!ret) |
| 1577 | return 0; |
| 1578 | } |
| 1579 | ret = seq_print_ip_sym(s, entry->stack.caller[i], |
| 1580 | sym_flags); |
| 1581 | if (!ret) |
| 1582 | return 0; |
| 1583 | } |
| 1584 | ret = trace_seq_puts(s, "\n"); |
| 1585 | if (!ret) |
| 1586 | return 0; |
| 1587 | break; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1588 | } |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1589 | return 1; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1590 | } |
| 1591 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1592 | static int print_raw_fmt(struct trace_iterator *iter) |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1593 | { |
| 1594 | struct trace_seq *s = &iter->seq; |
| 1595 | struct trace_entry *entry; |
| 1596 | int ret; |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1597 | int S, T; |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1598 | |
| 1599 | entry = iter->ent; |
| 1600 | |
| 1601 | ret = trace_seq_printf(s, "%d %d %llu ", |
| 1602 | entry->pid, iter->cpu, entry->t); |
| 1603 | if (!ret) |
| 1604 | return 0; |
| 1605 | |
| 1606 | switch (entry->type) { |
| 1607 | case TRACE_FN: |
| 1608 | ret = trace_seq_printf(s, "%x %x\n", |
| 1609 | entry->fn.ip, entry->fn.parent_ip); |
| 1610 | if (!ret) |
| 1611 | return 0; |
| 1612 | break; |
| 1613 | case TRACE_CTX: |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1614 | case TRACE_WAKE: |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1615 | S = entry->ctx.prev_state < sizeof(state_to_char) ? |
| 1616 | state_to_char[entry->ctx.prev_state] : 'X'; |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1617 | T = entry->ctx.next_state < sizeof(state_to_char) ? |
| 1618 | state_to_char[entry->ctx.next_state] : 'X'; |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1619 | if (entry->type == TRACE_WAKE) |
| 1620 | S = '+'; |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1621 | ret = trace_seq_printf(s, "%d %d %c %d %d %c\n", |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1622 | entry->ctx.prev_pid, |
| 1623 | entry->ctx.prev_prio, |
| 1624 | S, |
| 1625 | entry->ctx.next_pid, |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1626 | entry->ctx.next_prio, |
| 1627 | T); |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1628 | if (!ret) |
| 1629 | return 0; |
| 1630 | break; |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1631 | case TRACE_SPECIAL: |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1632 | case TRACE_STACK: |
Ingo Molnar | 88a4216 | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1633 | ret = trace_seq_printf(s, "# %ld %ld %ld\n", |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1634 | entry->special.arg1, |
| 1635 | entry->special.arg2, |
| 1636 | entry->special.arg3); |
| 1637 | if (!ret) |
| 1638 | return 0; |
| 1639 | break; |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1640 | } |
| 1641 | return 1; |
| 1642 | } |
| 1643 | |
Ingo Molnar | cb0f12a | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1644 | #define SEQ_PUT_FIELD_RET(s, x) \ |
| 1645 | do { \ |
| 1646 | if (!trace_seq_putmem(s, &(x), sizeof(x))) \ |
| 1647 | return 0; \ |
| 1648 | } while (0) |
| 1649 | |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1650 | #define SEQ_PUT_HEX_FIELD_RET(s, x) \ |
| 1651 | do { \ |
| 1652 | if (!trace_seq_putmem_hex(s, &(x), sizeof(x))) \ |
| 1653 | return 0; \ |
| 1654 | } while (0) |
| 1655 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1656 | static int print_hex_fmt(struct trace_iterator *iter) |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1657 | { |
| 1658 | struct trace_seq *s = &iter->seq; |
| 1659 | unsigned char newline = '\n'; |
| 1660 | struct trace_entry *entry; |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1661 | int S, T; |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1662 | |
| 1663 | entry = iter->ent; |
| 1664 | |
| 1665 | SEQ_PUT_HEX_FIELD_RET(s, entry->pid); |
| 1666 | SEQ_PUT_HEX_FIELD_RET(s, iter->cpu); |
| 1667 | SEQ_PUT_HEX_FIELD_RET(s, entry->t); |
| 1668 | |
| 1669 | switch (entry->type) { |
| 1670 | case TRACE_FN: |
| 1671 | SEQ_PUT_HEX_FIELD_RET(s, entry->fn.ip); |
| 1672 | SEQ_PUT_HEX_FIELD_RET(s, entry->fn.parent_ip); |
| 1673 | break; |
| 1674 | case TRACE_CTX: |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1675 | case TRACE_WAKE: |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1676 | S = entry->ctx.prev_state < sizeof(state_to_char) ? |
| 1677 | state_to_char[entry->ctx.prev_state] : 'X'; |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1678 | T = entry->ctx.next_state < sizeof(state_to_char) ? |
| 1679 | state_to_char[entry->ctx.next_state] : 'X'; |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1680 | if (entry->type == TRACE_WAKE) |
| 1681 | S = '+'; |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1682 | SEQ_PUT_HEX_FIELD_RET(s, entry->ctx.prev_pid); |
| 1683 | SEQ_PUT_HEX_FIELD_RET(s, entry->ctx.prev_prio); |
| 1684 | SEQ_PUT_HEX_FIELD_RET(s, S); |
| 1685 | SEQ_PUT_HEX_FIELD_RET(s, entry->ctx.next_pid); |
| 1686 | SEQ_PUT_HEX_FIELD_RET(s, entry->ctx.next_prio); |
| 1687 | SEQ_PUT_HEX_FIELD_RET(s, entry->fn.parent_ip); |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1688 | SEQ_PUT_HEX_FIELD_RET(s, T); |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1689 | break; |
| 1690 | case TRACE_SPECIAL: |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1691 | case TRACE_STACK: |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1692 | SEQ_PUT_HEX_FIELD_RET(s, entry->special.arg1); |
| 1693 | SEQ_PUT_HEX_FIELD_RET(s, entry->special.arg2); |
| 1694 | SEQ_PUT_HEX_FIELD_RET(s, entry->special.arg3); |
| 1695 | break; |
| 1696 | } |
| 1697 | SEQ_PUT_FIELD_RET(s, newline); |
| 1698 | |
| 1699 | return 1; |
| 1700 | } |
| 1701 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1702 | static int print_bin_fmt(struct trace_iterator *iter) |
Ingo Molnar | cb0f12a | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1703 | { |
| 1704 | struct trace_seq *s = &iter->seq; |
| 1705 | struct trace_entry *entry; |
| 1706 | |
| 1707 | entry = iter->ent; |
| 1708 | |
| 1709 | SEQ_PUT_FIELD_RET(s, entry->pid); |
| 1710 | SEQ_PUT_FIELD_RET(s, entry->cpu); |
| 1711 | SEQ_PUT_FIELD_RET(s, entry->t); |
| 1712 | |
| 1713 | switch (entry->type) { |
| 1714 | case TRACE_FN: |
| 1715 | SEQ_PUT_FIELD_RET(s, entry->fn.ip); |
| 1716 | SEQ_PUT_FIELD_RET(s, entry->fn.parent_ip); |
| 1717 | break; |
| 1718 | case TRACE_CTX: |
| 1719 | SEQ_PUT_FIELD_RET(s, entry->ctx.prev_pid); |
| 1720 | SEQ_PUT_FIELD_RET(s, entry->ctx.prev_prio); |
| 1721 | SEQ_PUT_FIELD_RET(s, entry->ctx.prev_state); |
| 1722 | SEQ_PUT_FIELD_RET(s, entry->ctx.next_pid); |
| 1723 | SEQ_PUT_FIELD_RET(s, entry->ctx.next_prio); |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1724 | SEQ_PUT_FIELD_RET(s, entry->ctx.next_state); |
Ingo Molnar | cb0f12a | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1725 | break; |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1726 | case TRACE_SPECIAL: |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1727 | case TRACE_STACK: |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1728 | SEQ_PUT_FIELD_RET(s, entry->special.arg1); |
| 1729 | SEQ_PUT_FIELD_RET(s, entry->special.arg2); |
| 1730 | SEQ_PUT_FIELD_RET(s, entry->special.arg3); |
| 1731 | break; |
Ingo Molnar | cb0f12a | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1732 | } |
| 1733 | return 1; |
| 1734 | } |
| 1735 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1736 | static int trace_empty(struct trace_iterator *iter) |
| 1737 | { |
| 1738 | struct trace_array_cpu *data; |
| 1739 | int cpu; |
| 1740 | |
Steven Rostedt | ab46428 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 1741 | for_each_tracing_cpu(cpu) { |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1742 | data = iter->tr->data[cpu]; |
| 1743 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1744 | if (head_page(data) && data->trace_idx && |
| 1745 | (data->trace_tail != data->trace_head || |
| 1746 | data->trace_tail_idx != data->trace_head_idx)) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1747 | return 0; |
| 1748 | } |
| 1749 | return 1; |
| 1750 | } |
| 1751 | |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1752 | static int print_trace_line(struct trace_iterator *iter) |
| 1753 | { |
Thomas Gleixner | 72829bc | 2008-05-23 21:37:28 +0200 | [diff] [blame] | 1754 | if (iter->trace && iter->trace->print_line) |
| 1755 | return iter->trace->print_line(iter); |
| 1756 | |
Ingo Molnar | cb0f12a | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1757 | if (trace_flags & TRACE_ITER_BIN) |
| 1758 | return print_bin_fmt(iter); |
| 1759 | |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1760 | if (trace_flags & TRACE_ITER_HEX) |
| 1761 | return print_hex_fmt(iter); |
| 1762 | |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1763 | if (trace_flags & TRACE_ITER_RAW) |
| 1764 | return print_raw_fmt(iter); |
| 1765 | |
| 1766 | if (iter->iter_flags & TRACE_FILE_LAT_FMT) |
| 1767 | return print_lat_fmt(iter, iter->idx, iter->cpu); |
| 1768 | |
| 1769 | return print_trace_fmt(iter); |
| 1770 | } |
| 1771 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1772 | static int s_show(struct seq_file *m, void *v) |
| 1773 | { |
| 1774 | struct trace_iterator *iter = v; |
| 1775 | |
| 1776 | if (iter->ent == NULL) { |
| 1777 | if (iter->tr) { |
| 1778 | seq_printf(m, "# tracer: %s\n", iter->trace->name); |
| 1779 | seq_puts(m, "#\n"); |
| 1780 | } |
| 1781 | if (iter->iter_flags & TRACE_FILE_LAT_FMT) { |
| 1782 | /* print nothing if the buffers are empty */ |
| 1783 | if (trace_empty(iter)) |
| 1784 | return 0; |
| 1785 | print_trace_header(m, iter); |
| 1786 | if (!(trace_flags & TRACE_ITER_VERBOSE)) |
| 1787 | print_lat_help_header(m); |
| 1788 | } else { |
| 1789 | if (!(trace_flags & TRACE_ITER_VERBOSE)) |
| 1790 | print_func_help_header(m); |
| 1791 | } |
| 1792 | } else { |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1793 | print_trace_line(iter); |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1794 | trace_print_seq(m, &iter->seq); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1795 | } |
| 1796 | |
| 1797 | return 0; |
| 1798 | } |
| 1799 | |
| 1800 | static struct seq_operations tracer_seq_ops = { |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1801 | .start = s_start, |
| 1802 | .next = s_next, |
| 1803 | .stop = s_stop, |
| 1804 | .show = s_show, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1805 | }; |
| 1806 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1807 | static struct trace_iterator * |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1808 | __tracing_open(struct inode *inode, struct file *file, int *ret) |
| 1809 | { |
| 1810 | struct trace_iterator *iter; |
| 1811 | |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 1812 | if (tracing_disabled) { |
| 1813 | *ret = -ENODEV; |
| 1814 | return NULL; |
| 1815 | } |
| 1816 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1817 | iter = kzalloc(sizeof(*iter), GFP_KERNEL); |
| 1818 | if (!iter) { |
| 1819 | *ret = -ENOMEM; |
| 1820 | goto out; |
| 1821 | } |
| 1822 | |
| 1823 | mutex_lock(&trace_types_lock); |
| 1824 | if (current_trace && current_trace->print_max) |
| 1825 | iter->tr = &max_tr; |
| 1826 | else |
| 1827 | iter->tr = inode->i_private; |
| 1828 | iter->trace = current_trace; |
| 1829 | iter->pos = -1; |
| 1830 | |
| 1831 | /* TODO stop tracer */ |
| 1832 | *ret = seq_open(file, &tracer_seq_ops); |
| 1833 | if (!*ret) { |
| 1834 | struct seq_file *m = file->private_data; |
| 1835 | m->private = iter; |
| 1836 | |
| 1837 | /* stop the trace while dumping */ |
| 1838 | if (iter->tr->ctrl) |
| 1839 | tracer_enabled = 0; |
| 1840 | |
| 1841 | if (iter->trace && iter->trace->open) |
| 1842 | iter->trace->open(iter); |
| 1843 | } else { |
| 1844 | kfree(iter); |
| 1845 | iter = NULL; |
| 1846 | } |
| 1847 | mutex_unlock(&trace_types_lock); |
| 1848 | |
| 1849 | out: |
| 1850 | return iter; |
| 1851 | } |
| 1852 | |
| 1853 | int tracing_open_generic(struct inode *inode, struct file *filp) |
| 1854 | { |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 1855 | if (tracing_disabled) |
| 1856 | return -ENODEV; |
| 1857 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1858 | filp->private_data = inode->i_private; |
| 1859 | return 0; |
| 1860 | } |
| 1861 | |
| 1862 | int tracing_release(struct inode *inode, struct file *file) |
| 1863 | { |
| 1864 | struct seq_file *m = (struct seq_file *)file->private_data; |
| 1865 | struct trace_iterator *iter = m->private; |
| 1866 | |
| 1867 | mutex_lock(&trace_types_lock); |
| 1868 | if (iter->trace && iter->trace->close) |
| 1869 | iter->trace->close(iter); |
| 1870 | |
| 1871 | /* reenable tracing if it was previously enabled */ |
| 1872 | if (iter->tr->ctrl) |
| 1873 | tracer_enabled = 1; |
| 1874 | mutex_unlock(&trace_types_lock); |
| 1875 | |
| 1876 | seq_release(inode, file); |
| 1877 | kfree(iter); |
| 1878 | return 0; |
| 1879 | } |
| 1880 | |
| 1881 | static int tracing_open(struct inode *inode, struct file *file) |
| 1882 | { |
| 1883 | int ret; |
| 1884 | |
| 1885 | __tracing_open(inode, file, &ret); |
| 1886 | |
| 1887 | return ret; |
| 1888 | } |
| 1889 | |
| 1890 | static int tracing_lt_open(struct inode *inode, struct file *file) |
| 1891 | { |
| 1892 | struct trace_iterator *iter; |
| 1893 | int ret; |
| 1894 | |
| 1895 | iter = __tracing_open(inode, file, &ret); |
| 1896 | |
| 1897 | if (!ret) |
| 1898 | iter->iter_flags |= TRACE_FILE_LAT_FMT; |
| 1899 | |
| 1900 | return ret; |
| 1901 | } |
| 1902 | |
| 1903 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1904 | static void * |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1905 | t_next(struct seq_file *m, void *v, loff_t *pos) |
| 1906 | { |
| 1907 | struct tracer *t = m->private; |
| 1908 | |
| 1909 | (*pos)++; |
| 1910 | |
| 1911 | if (t) |
| 1912 | t = t->next; |
| 1913 | |
| 1914 | m->private = t; |
| 1915 | |
| 1916 | return t; |
| 1917 | } |
| 1918 | |
| 1919 | static void *t_start(struct seq_file *m, loff_t *pos) |
| 1920 | { |
| 1921 | struct tracer *t = m->private; |
| 1922 | loff_t l = 0; |
| 1923 | |
| 1924 | mutex_lock(&trace_types_lock); |
| 1925 | for (; t && l < *pos; t = t_next(m, t, &l)) |
| 1926 | ; |
| 1927 | |
| 1928 | return t; |
| 1929 | } |
| 1930 | |
| 1931 | static void t_stop(struct seq_file *m, void *p) |
| 1932 | { |
| 1933 | mutex_unlock(&trace_types_lock); |
| 1934 | } |
| 1935 | |
| 1936 | static int t_show(struct seq_file *m, void *v) |
| 1937 | { |
| 1938 | struct tracer *t = v; |
| 1939 | |
| 1940 | if (!t) |
| 1941 | return 0; |
| 1942 | |
| 1943 | seq_printf(m, "%s", t->name); |
| 1944 | if (t->next) |
| 1945 | seq_putc(m, ' '); |
| 1946 | else |
| 1947 | seq_putc(m, '\n'); |
| 1948 | |
| 1949 | return 0; |
| 1950 | } |
| 1951 | |
| 1952 | static struct seq_operations show_traces_seq_ops = { |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1953 | .start = t_start, |
| 1954 | .next = t_next, |
| 1955 | .stop = t_stop, |
| 1956 | .show = t_show, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1957 | }; |
| 1958 | |
| 1959 | static int show_traces_open(struct inode *inode, struct file *file) |
| 1960 | { |
| 1961 | int ret; |
| 1962 | |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 1963 | if (tracing_disabled) |
| 1964 | return -ENODEV; |
| 1965 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1966 | ret = seq_open(file, &show_traces_seq_ops); |
| 1967 | if (!ret) { |
| 1968 | struct seq_file *m = file->private_data; |
| 1969 | m->private = trace_types; |
| 1970 | } |
| 1971 | |
| 1972 | return ret; |
| 1973 | } |
| 1974 | |
| 1975 | static struct file_operations tracing_fops = { |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1976 | .open = tracing_open, |
| 1977 | .read = seq_read, |
| 1978 | .llseek = seq_lseek, |
| 1979 | .release = tracing_release, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1980 | }; |
| 1981 | |
| 1982 | static struct file_operations tracing_lt_fops = { |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1983 | .open = tracing_lt_open, |
| 1984 | .read = seq_read, |
| 1985 | .llseek = seq_lseek, |
| 1986 | .release = tracing_release, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1987 | }; |
| 1988 | |
| 1989 | static struct file_operations show_traces_fops = { |
Ingo Molnar | c7078de | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 1990 | .open = show_traces_open, |
| 1991 | .read = seq_read, |
| 1992 | .release = seq_release, |
| 1993 | }; |
| 1994 | |
Ingo Molnar | 36dfe92 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 1995 | /* |
| 1996 | * Only trace on a CPU if the bitmask is set: |
| 1997 | */ |
| 1998 | static cpumask_t tracing_cpumask = CPU_MASK_ALL; |
| 1999 | |
| 2000 | /* |
| 2001 | * When tracing/tracing_cpu_mask is modified then this holds |
| 2002 | * the new bitmask we are about to install: |
| 2003 | */ |
| 2004 | static cpumask_t tracing_cpumask_new; |
| 2005 | |
| 2006 | /* |
| 2007 | * The tracer itself will not take this lock, but still we want |
| 2008 | * to provide a consistent cpumask to user-space: |
| 2009 | */ |
| 2010 | static DEFINE_MUTEX(tracing_cpumask_update_lock); |
| 2011 | |
| 2012 | /* |
| 2013 | * Temporary storage for the character representation of the |
| 2014 | * CPU bitmask (and one more byte for the newline): |
| 2015 | */ |
| 2016 | static char mask_str[NR_CPUS + 1]; |
| 2017 | |
Ingo Molnar | c7078de | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2018 | static ssize_t |
| 2019 | tracing_cpumask_read(struct file *filp, char __user *ubuf, |
| 2020 | size_t count, loff_t *ppos) |
| 2021 | { |
Ingo Molnar | 36dfe92 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2022 | int len; |
Ingo Molnar | c7078de | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2023 | |
| 2024 | mutex_lock(&tracing_cpumask_update_lock); |
Ingo Molnar | 36dfe92 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2025 | |
| 2026 | len = cpumask_scnprintf(mask_str, count, tracing_cpumask); |
| 2027 | if (count - len < 2) { |
| 2028 | count = -EINVAL; |
| 2029 | goto out_err; |
| 2030 | } |
| 2031 | len += sprintf(mask_str + len, "\n"); |
| 2032 | count = simple_read_from_buffer(ubuf, count, ppos, mask_str, NR_CPUS+1); |
| 2033 | |
| 2034 | out_err: |
Ingo Molnar | c7078de | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2035 | mutex_unlock(&tracing_cpumask_update_lock); |
| 2036 | |
| 2037 | return count; |
| 2038 | } |
| 2039 | |
| 2040 | static ssize_t |
| 2041 | tracing_cpumask_write(struct file *filp, const char __user *ubuf, |
| 2042 | size_t count, loff_t *ppos) |
| 2043 | { |
Ingo Molnar | 36dfe92 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2044 | int err, cpu; |
Ingo Molnar | c7078de | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2045 | |
| 2046 | mutex_lock(&tracing_cpumask_update_lock); |
Ingo Molnar | 36dfe92 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2047 | err = cpumask_parse_user(ubuf, count, tracing_cpumask_new); |
| 2048 | if (err) |
| 2049 | goto err_unlock; |
| 2050 | |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 2051 | raw_local_irq_disable(); |
| 2052 | __raw_spin_lock(&ftrace_max_lock); |
Steven Rostedt | ab46428 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 2053 | for_each_tracing_cpu(cpu) { |
Ingo Molnar | 36dfe92 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2054 | /* |
| 2055 | * Increase/decrease the disabled counter if we are |
| 2056 | * about to flip a bit in the cpumask: |
| 2057 | */ |
| 2058 | if (cpu_isset(cpu, tracing_cpumask) && |
| 2059 | !cpu_isset(cpu, tracing_cpumask_new)) { |
| 2060 | atomic_inc(&global_trace.data[cpu]->disabled); |
| 2061 | } |
| 2062 | if (!cpu_isset(cpu, tracing_cpumask) && |
| 2063 | cpu_isset(cpu, tracing_cpumask_new)) { |
| 2064 | atomic_dec(&global_trace.data[cpu]->disabled); |
| 2065 | } |
| 2066 | } |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 2067 | __raw_spin_unlock(&ftrace_max_lock); |
| 2068 | raw_local_irq_enable(); |
Ingo Molnar | 36dfe92 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2069 | |
| 2070 | tracing_cpumask = tracing_cpumask_new; |
| 2071 | |
Ingo Molnar | c7078de | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2072 | mutex_unlock(&tracing_cpumask_update_lock); |
| 2073 | |
Ingo Molnar | c7078de | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2074 | return count; |
Ingo Molnar | 36dfe92 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2075 | |
| 2076 | err_unlock: |
| 2077 | mutex_unlock(&tracing_cpumask_update_lock); |
| 2078 | |
| 2079 | return err; |
Ingo Molnar | c7078de | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2080 | } |
| 2081 | |
| 2082 | static struct file_operations tracing_cpumask_fops = { |
| 2083 | .open = tracing_open_generic, |
| 2084 | .read = tracing_cpumask_read, |
| 2085 | .write = tracing_cpumask_write, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2086 | }; |
| 2087 | |
| 2088 | static ssize_t |
| 2089 | tracing_iter_ctrl_read(struct file *filp, char __user *ubuf, |
| 2090 | size_t cnt, loff_t *ppos) |
| 2091 | { |
| 2092 | char *buf; |
| 2093 | int r = 0; |
| 2094 | int len = 0; |
| 2095 | int i; |
| 2096 | |
| 2097 | /* calulate max size */ |
| 2098 | for (i = 0; trace_options[i]; i++) { |
| 2099 | len += strlen(trace_options[i]); |
| 2100 | len += 3; /* "no" and space */ |
| 2101 | } |
| 2102 | |
| 2103 | /* +2 for \n and \0 */ |
| 2104 | buf = kmalloc(len + 2, GFP_KERNEL); |
| 2105 | if (!buf) |
| 2106 | return -ENOMEM; |
| 2107 | |
| 2108 | for (i = 0; trace_options[i]; i++) { |
| 2109 | if (trace_flags & (1 << i)) |
| 2110 | r += sprintf(buf + r, "%s ", trace_options[i]); |
| 2111 | else |
| 2112 | r += sprintf(buf + r, "no%s ", trace_options[i]); |
| 2113 | } |
| 2114 | |
| 2115 | r += sprintf(buf + r, "\n"); |
| 2116 | WARN_ON(r >= len + 2); |
| 2117 | |
Ingo Molnar | 36dfe92 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2118 | r = simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2119 | |
| 2120 | kfree(buf); |
| 2121 | |
| 2122 | return r; |
| 2123 | } |
| 2124 | |
| 2125 | static ssize_t |
| 2126 | tracing_iter_ctrl_write(struct file *filp, const char __user *ubuf, |
| 2127 | size_t cnt, loff_t *ppos) |
| 2128 | { |
| 2129 | char buf[64]; |
| 2130 | char *cmp = buf; |
| 2131 | int neg = 0; |
| 2132 | int i; |
| 2133 | |
Steven Rostedt | cffae43 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 2134 | if (cnt >= sizeof(buf)) |
| 2135 | return -EINVAL; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2136 | |
| 2137 | if (copy_from_user(&buf, ubuf, cnt)) |
| 2138 | return -EFAULT; |
| 2139 | |
| 2140 | buf[cnt] = 0; |
| 2141 | |
| 2142 | if (strncmp(buf, "no", 2) == 0) { |
| 2143 | neg = 1; |
| 2144 | cmp += 2; |
| 2145 | } |
| 2146 | |
| 2147 | for (i = 0; trace_options[i]; i++) { |
| 2148 | int len = strlen(trace_options[i]); |
| 2149 | |
| 2150 | if (strncmp(cmp, trace_options[i], len) == 0) { |
| 2151 | if (neg) |
| 2152 | trace_flags &= ~(1 << i); |
| 2153 | else |
| 2154 | trace_flags |= (1 << i); |
| 2155 | break; |
| 2156 | } |
| 2157 | } |
Ingo Molnar | 442e544 | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 2158 | /* |
| 2159 | * If no option could be set, return an error: |
| 2160 | */ |
| 2161 | if (!trace_options[i]) |
| 2162 | return -EINVAL; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2163 | |
| 2164 | filp->f_pos += cnt; |
| 2165 | |
| 2166 | return cnt; |
| 2167 | } |
| 2168 | |
| 2169 | static struct file_operations tracing_iter_fops = { |
Ingo Molnar | c7078de | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2170 | .open = tracing_open_generic, |
| 2171 | .read = tracing_iter_ctrl_read, |
| 2172 | .write = tracing_iter_ctrl_write, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2173 | }; |
| 2174 | |
Ingo Molnar | 7bd2f24 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 2175 | static const char readme_msg[] = |
| 2176 | "tracing mini-HOWTO:\n\n" |
| 2177 | "# mkdir /debug\n" |
| 2178 | "# mount -t debugfs nodev /debug\n\n" |
| 2179 | "# cat /debug/tracing/available_tracers\n" |
| 2180 | "wakeup preemptirqsoff preemptoff irqsoff ftrace sched_switch none\n\n" |
| 2181 | "# cat /debug/tracing/current_tracer\n" |
| 2182 | "none\n" |
| 2183 | "# echo sched_switch > /debug/tracing/current_tracer\n" |
| 2184 | "# cat /debug/tracing/current_tracer\n" |
| 2185 | "sched_switch\n" |
| 2186 | "# cat /debug/tracing/iter_ctrl\n" |
| 2187 | "noprint-parent nosym-offset nosym-addr noverbose\n" |
| 2188 | "# echo print-parent > /debug/tracing/iter_ctrl\n" |
| 2189 | "# echo 1 > /debug/tracing/tracing_enabled\n" |
| 2190 | "# cat /debug/tracing/trace > /tmp/trace.txt\n" |
| 2191 | "echo 0 > /debug/tracing/tracing_enabled\n" |
| 2192 | ; |
| 2193 | |
| 2194 | static ssize_t |
| 2195 | tracing_readme_read(struct file *filp, char __user *ubuf, |
| 2196 | size_t cnt, loff_t *ppos) |
| 2197 | { |
| 2198 | return simple_read_from_buffer(ubuf, cnt, ppos, |
| 2199 | readme_msg, strlen(readme_msg)); |
| 2200 | } |
| 2201 | |
| 2202 | static struct file_operations tracing_readme_fops = { |
Ingo Molnar | c7078de | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2203 | .open = tracing_open_generic, |
| 2204 | .read = tracing_readme_read, |
Ingo Molnar | 7bd2f24 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 2205 | }; |
| 2206 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2207 | static ssize_t |
| 2208 | tracing_ctrl_read(struct file *filp, char __user *ubuf, |
| 2209 | size_t cnt, loff_t *ppos) |
| 2210 | { |
| 2211 | struct trace_array *tr = filp->private_data; |
| 2212 | char buf[64]; |
| 2213 | int r; |
| 2214 | |
| 2215 | r = sprintf(buf, "%ld\n", tr->ctrl); |
Ingo Molnar | 4e3c333 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 2216 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2217 | } |
| 2218 | |
| 2219 | static ssize_t |
| 2220 | tracing_ctrl_write(struct file *filp, const char __user *ubuf, |
| 2221 | size_t cnt, loff_t *ppos) |
| 2222 | { |
| 2223 | struct trace_array *tr = filp->private_data; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2224 | char buf[64]; |
Steven Rostedt | c6caeeb | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 2225 | long val; |
| 2226 | int ret; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2227 | |
Steven Rostedt | cffae43 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 2228 | if (cnt >= sizeof(buf)) |
| 2229 | return -EINVAL; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2230 | |
| 2231 | if (copy_from_user(&buf, ubuf, cnt)) |
| 2232 | return -EFAULT; |
| 2233 | |
| 2234 | buf[cnt] = 0; |
| 2235 | |
Steven Rostedt | c6caeeb | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 2236 | ret = strict_strtoul(buf, 10, &val); |
| 2237 | if (ret < 0) |
| 2238 | return ret; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2239 | |
| 2240 | val = !!val; |
| 2241 | |
| 2242 | mutex_lock(&trace_types_lock); |
| 2243 | if (tr->ctrl ^ val) { |
| 2244 | if (val) |
| 2245 | tracer_enabled = 1; |
| 2246 | else |
| 2247 | tracer_enabled = 0; |
| 2248 | |
| 2249 | tr->ctrl = val; |
| 2250 | |
| 2251 | if (current_trace && current_trace->ctrl_update) |
| 2252 | current_trace->ctrl_update(tr); |
| 2253 | } |
| 2254 | mutex_unlock(&trace_types_lock); |
| 2255 | |
| 2256 | filp->f_pos += cnt; |
| 2257 | |
| 2258 | return cnt; |
| 2259 | } |
| 2260 | |
| 2261 | static ssize_t |
| 2262 | tracing_set_trace_read(struct file *filp, char __user *ubuf, |
| 2263 | size_t cnt, loff_t *ppos) |
| 2264 | { |
| 2265 | char buf[max_tracer_type_len+2]; |
| 2266 | int r; |
| 2267 | |
| 2268 | mutex_lock(&trace_types_lock); |
| 2269 | if (current_trace) |
| 2270 | r = sprintf(buf, "%s\n", current_trace->name); |
| 2271 | else |
| 2272 | r = sprintf(buf, "\n"); |
| 2273 | mutex_unlock(&trace_types_lock); |
| 2274 | |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2275 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2276 | } |
| 2277 | |
| 2278 | static ssize_t |
| 2279 | tracing_set_trace_write(struct file *filp, const char __user *ubuf, |
| 2280 | size_t cnt, loff_t *ppos) |
| 2281 | { |
| 2282 | struct trace_array *tr = &global_trace; |
| 2283 | struct tracer *t; |
| 2284 | char buf[max_tracer_type_len+1]; |
| 2285 | int i; |
| 2286 | |
| 2287 | if (cnt > max_tracer_type_len) |
| 2288 | cnt = max_tracer_type_len; |
| 2289 | |
| 2290 | if (copy_from_user(&buf, ubuf, cnt)) |
| 2291 | return -EFAULT; |
| 2292 | |
| 2293 | buf[cnt] = 0; |
| 2294 | |
| 2295 | /* strip ending whitespace. */ |
| 2296 | for (i = cnt - 1; i > 0 && isspace(buf[i]); i--) |
| 2297 | buf[i] = 0; |
| 2298 | |
| 2299 | mutex_lock(&trace_types_lock); |
| 2300 | for (t = trace_types; t; t = t->next) { |
| 2301 | if (strcmp(t->name, buf) == 0) |
| 2302 | break; |
| 2303 | } |
| 2304 | if (!t || t == current_trace) |
| 2305 | goto out; |
| 2306 | |
| 2307 | if (current_trace && current_trace->reset) |
| 2308 | current_trace->reset(tr); |
| 2309 | |
| 2310 | current_trace = t; |
| 2311 | if (t->init) |
| 2312 | t->init(tr); |
| 2313 | |
| 2314 | out: |
| 2315 | mutex_unlock(&trace_types_lock); |
| 2316 | |
| 2317 | filp->f_pos += cnt; |
| 2318 | |
| 2319 | return cnt; |
| 2320 | } |
| 2321 | |
| 2322 | static ssize_t |
| 2323 | tracing_max_lat_read(struct file *filp, char __user *ubuf, |
| 2324 | size_t cnt, loff_t *ppos) |
| 2325 | { |
| 2326 | unsigned long *ptr = filp->private_data; |
| 2327 | char buf[64]; |
| 2328 | int r; |
| 2329 | |
Steven Rostedt | cffae43 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 2330 | r = snprintf(buf, sizeof(buf), "%ld\n", |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2331 | *ptr == (unsigned long)-1 ? -1 : nsecs_to_usecs(*ptr)); |
Steven Rostedt | cffae43 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 2332 | if (r > sizeof(buf)) |
| 2333 | r = sizeof(buf); |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2334 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2335 | } |
| 2336 | |
| 2337 | static ssize_t |
| 2338 | tracing_max_lat_write(struct file *filp, const char __user *ubuf, |
| 2339 | size_t cnt, loff_t *ppos) |
| 2340 | { |
| 2341 | long *ptr = filp->private_data; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2342 | char buf[64]; |
Steven Rostedt | c6caeeb | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 2343 | long val; |
| 2344 | int ret; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2345 | |
Steven Rostedt | cffae43 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 2346 | if (cnt >= sizeof(buf)) |
| 2347 | return -EINVAL; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2348 | |
| 2349 | if (copy_from_user(&buf, ubuf, cnt)) |
| 2350 | return -EFAULT; |
| 2351 | |
| 2352 | buf[cnt] = 0; |
| 2353 | |
Steven Rostedt | c6caeeb | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 2354 | ret = strict_strtoul(buf, 10, &val); |
| 2355 | if (ret < 0) |
| 2356 | return ret; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2357 | |
| 2358 | *ptr = val * 1000; |
| 2359 | |
| 2360 | return cnt; |
| 2361 | } |
| 2362 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2363 | static atomic_t tracing_reader; |
| 2364 | |
| 2365 | static int tracing_open_pipe(struct inode *inode, struct file *filp) |
| 2366 | { |
| 2367 | struct trace_iterator *iter; |
| 2368 | |
| 2369 | if (tracing_disabled) |
| 2370 | return -ENODEV; |
| 2371 | |
| 2372 | /* We only allow for reader of the pipe */ |
| 2373 | if (atomic_inc_return(&tracing_reader) != 1) { |
| 2374 | atomic_dec(&tracing_reader); |
| 2375 | return -EBUSY; |
| 2376 | } |
| 2377 | |
| 2378 | /* create a buffer to store the information to pass to userspace */ |
| 2379 | iter = kzalloc(sizeof(*iter), GFP_KERNEL); |
| 2380 | if (!iter) |
| 2381 | return -ENOMEM; |
| 2382 | |
Steven Rostedt | 107bad8 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2383 | mutex_lock(&trace_types_lock); |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2384 | iter->tr = &global_trace; |
Thomas Gleixner | 72829bc | 2008-05-23 21:37:28 +0200 | [diff] [blame] | 2385 | iter->trace = current_trace; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2386 | filp->private_data = iter; |
| 2387 | |
Steven Rostedt | 107bad8 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2388 | if (iter->trace->pipe_open) |
| 2389 | iter->trace->pipe_open(iter); |
| 2390 | mutex_unlock(&trace_types_lock); |
| 2391 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2392 | return 0; |
| 2393 | } |
| 2394 | |
| 2395 | static int tracing_release_pipe(struct inode *inode, struct file *file) |
| 2396 | { |
| 2397 | struct trace_iterator *iter = file->private_data; |
| 2398 | |
| 2399 | kfree(iter); |
| 2400 | atomic_dec(&tracing_reader); |
| 2401 | |
| 2402 | return 0; |
| 2403 | } |
| 2404 | |
Soeren Sandmann Pedersen | 2a2cc8f | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2405 | static unsigned int |
| 2406 | tracing_poll_pipe(struct file *filp, poll_table *poll_table) |
| 2407 | { |
| 2408 | struct trace_iterator *iter = filp->private_data; |
| 2409 | |
| 2410 | if (trace_flags & TRACE_ITER_BLOCK) { |
| 2411 | /* |
| 2412 | * Always select as readable when in blocking mode |
| 2413 | */ |
| 2414 | return POLLIN | POLLRDNORM; |
Ingo Molnar | afc2abc | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 2415 | } else { |
Soeren Sandmann Pedersen | 2a2cc8f | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2416 | if (!trace_empty(iter)) |
| 2417 | return POLLIN | POLLRDNORM; |
| 2418 | poll_wait(filp, &trace_wait, poll_table); |
| 2419 | if (!trace_empty(iter)) |
| 2420 | return POLLIN | POLLRDNORM; |
| 2421 | |
| 2422 | return 0; |
| 2423 | } |
| 2424 | } |
| 2425 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2426 | /* |
| 2427 | * Consumer reader. |
| 2428 | */ |
| 2429 | static ssize_t |
| 2430 | tracing_read_pipe(struct file *filp, char __user *ubuf, |
| 2431 | size_t cnt, loff_t *ppos) |
| 2432 | { |
| 2433 | struct trace_iterator *iter = filp->private_data; |
| 2434 | struct trace_array_cpu *data; |
| 2435 | static cpumask_t mask; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2436 | unsigned long flags; |
Ingo Molnar | 2577046 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2437 | #ifdef CONFIG_FTRACE |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2438 | int ftrace_save; |
Ingo Molnar | 2577046 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2439 | #endif |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2440 | int cpu; |
Pekka Paalanen | 6c6c279 | 2008-05-12 21:21:02 +0200 | [diff] [blame] | 2441 | ssize_t sret; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2442 | |
| 2443 | /* return any leftover data */ |
Pekka Paalanen | 6c6c279 | 2008-05-12 21:21:02 +0200 | [diff] [blame] | 2444 | sret = trace_seq_to_user(&iter->seq, ubuf, cnt); |
| 2445 | if (sret != -EBUSY) |
| 2446 | return sret; |
| 2447 | sret = 0; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2448 | |
Pekka Paalanen | 6c6c279 | 2008-05-12 21:21:02 +0200 | [diff] [blame] | 2449 | trace_seq_reset(&iter->seq); |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2450 | |
Steven Rostedt | 107bad8 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2451 | mutex_lock(&trace_types_lock); |
| 2452 | if (iter->trace->read) { |
Pekka Paalanen | 6c6c279 | 2008-05-12 21:21:02 +0200 | [diff] [blame] | 2453 | sret = iter->trace->read(iter, filp, ubuf, cnt, ppos); |
| 2454 | if (sret) |
Steven Rostedt | 107bad8 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2455 | goto out; |
Steven Rostedt | 107bad8 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2456 | } |
| 2457 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2458 | while (trace_empty(iter)) { |
Steven Rostedt | 2dc8f09 | 2008-05-12 21:20:58 +0200 | [diff] [blame] | 2459 | |
Steven Rostedt | 107bad8 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2460 | if ((filp->f_flags & O_NONBLOCK)) { |
Pekka Paalanen | 6c6c279 | 2008-05-12 21:21:02 +0200 | [diff] [blame] | 2461 | sret = -EAGAIN; |
Steven Rostedt | 107bad8 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2462 | goto out; |
| 2463 | } |
Steven Rostedt | 2dc8f09 | 2008-05-12 21:20:58 +0200 | [diff] [blame] | 2464 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2465 | /* |
| 2466 | * This is a make-shift waitqueue. The reason we don't use |
| 2467 | * an actual wait queue is because: |
| 2468 | * 1) we only ever have one waiter |
| 2469 | * 2) the tracing, traces all functions, we don't want |
| 2470 | * the overhead of calling wake_up and friends |
| 2471 | * (and tracing them too) |
| 2472 | * Anyway, this is really very primitive wakeup. |
| 2473 | */ |
| 2474 | set_current_state(TASK_INTERRUPTIBLE); |
| 2475 | iter->tr->waiter = current; |
| 2476 | |
Steven Rostedt | 107bad8 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2477 | mutex_unlock(&trace_types_lock); |
| 2478 | |
Ingo Molnar | 9fe068e | 2008-05-12 21:21:02 +0200 | [diff] [blame] | 2479 | /* sleep for 100 msecs, and try again. */ |
| 2480 | schedule_timeout(HZ/10); |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2481 | |
Steven Rostedt | 107bad8 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2482 | mutex_lock(&trace_types_lock); |
| 2483 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2484 | iter->tr->waiter = NULL; |
| 2485 | |
Steven Rostedt | 107bad8 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2486 | if (signal_pending(current)) { |
Pekka Paalanen | 6c6c279 | 2008-05-12 21:21:02 +0200 | [diff] [blame] | 2487 | sret = -EINTR; |
Steven Rostedt | 107bad8 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2488 | goto out; |
| 2489 | } |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2490 | |
Steven Rostedt | 8452799 | 2008-05-12 21:20:58 +0200 | [diff] [blame] | 2491 | if (iter->trace != current_trace) |
Steven Rostedt | 107bad8 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2492 | goto out; |
Steven Rostedt | 8452799 | 2008-05-12 21:20:58 +0200 | [diff] [blame] | 2493 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2494 | /* |
| 2495 | * We block until we read something and tracing is disabled. |
| 2496 | * We still block if tracing is disabled, but we have never |
| 2497 | * read anything. This allows a user to cat this file, and |
| 2498 | * then enable tracing. But after we have read something, |
| 2499 | * we give an EOF when tracing is again disabled. |
| 2500 | * |
| 2501 | * iter->pos will be 0 if we haven't read anything. |
| 2502 | */ |
| 2503 | if (!tracer_enabled && iter->pos) |
| 2504 | break; |
| 2505 | |
| 2506 | continue; |
| 2507 | } |
| 2508 | |
| 2509 | /* stop when tracing is finished */ |
| 2510 | if (trace_empty(iter)) |
Steven Rostedt | 107bad8 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2511 | goto out; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2512 | |
| 2513 | if (cnt >= PAGE_SIZE) |
| 2514 | cnt = PAGE_SIZE - 1; |
| 2515 | |
Steven Rostedt | 53d0aa7 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2516 | /* reset all but tr, trace, and overruns */ |
Steven Rostedt | 53d0aa7 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2517 | memset(&iter->seq, 0, |
| 2518 | sizeof(struct trace_iterator) - |
| 2519 | offsetof(struct trace_iterator, seq)); |
Steven Rostedt | 4823ed7 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2520 | iter->pos = -1; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2521 | |
| 2522 | /* |
| 2523 | * We need to stop all tracing on all CPUS to read the |
| 2524 | * the next buffer. This is a bit expensive, but is |
| 2525 | * not done often. We fill all what we can read, |
| 2526 | * and then release the locks again. |
| 2527 | */ |
| 2528 | |
| 2529 | cpus_clear(mask); |
| 2530 | local_irq_save(flags); |
Ingo Molnar | 2577046 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2531 | #ifdef CONFIG_FTRACE |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2532 | ftrace_save = ftrace_enabled; |
| 2533 | ftrace_enabled = 0; |
Ingo Molnar | 2577046 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2534 | #endif |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2535 | smp_wmb(); |
Steven Rostedt | ab46428 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 2536 | for_each_tracing_cpu(cpu) { |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2537 | data = iter->tr->data[cpu]; |
| 2538 | |
| 2539 | if (!head_page(data) || !data->trace_idx) |
| 2540 | continue; |
| 2541 | |
| 2542 | atomic_inc(&data->disabled); |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2543 | cpu_set(cpu, mask); |
| 2544 | } |
| 2545 | |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2546 | for_each_cpu_mask(cpu, mask) { |
| 2547 | data = iter->tr->data[cpu]; |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 2548 | __raw_spin_lock(&data->lock); |
Steven Rostedt | 53d0aa7 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2549 | |
| 2550 | if (data->overrun > iter->last_overrun[cpu]) |
| 2551 | iter->overrun[cpu] += |
| 2552 | data->overrun - iter->last_overrun[cpu]; |
| 2553 | iter->last_overrun[cpu] = data->overrun; |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2554 | } |
| 2555 | |
Steven Rostedt | 088b1e4 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 2556 | while (find_next_entry_inc(iter) != NULL) { |
Pekka Paalanen | 6c6c279 | 2008-05-12 21:21:02 +0200 | [diff] [blame] | 2557 | int ret; |
Steven Rostedt | 088b1e4 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 2558 | int len = iter->seq.len; |
| 2559 | |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 2560 | ret = print_trace_line(iter); |
Steven Rostedt | 088b1e4 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 2561 | if (!ret) { |
| 2562 | /* don't print partial lines */ |
| 2563 | iter->seq.len = len; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2564 | break; |
Steven Rostedt | 088b1e4 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 2565 | } |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2566 | |
| 2567 | trace_consume(iter); |
| 2568 | |
| 2569 | if (iter->seq.len >= cnt) |
| 2570 | break; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2571 | } |
| 2572 | |
Ingo Molnar | d4c5a2f | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2573 | for_each_cpu_mask(cpu, mask) { |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2574 | data = iter->tr->data[cpu]; |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 2575 | __raw_spin_unlock(&data->lock); |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2576 | } |
| 2577 | |
| 2578 | for_each_cpu_mask(cpu, mask) { |
| 2579 | data = iter->tr->data[cpu]; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2580 | atomic_dec(&data->disabled); |
| 2581 | } |
Ingo Molnar | 2577046 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2582 | #ifdef CONFIG_FTRACE |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2583 | ftrace_enabled = ftrace_save; |
Ingo Molnar | 2577046 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2584 | #endif |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2585 | local_irq_restore(flags); |
| 2586 | |
| 2587 | /* Now copy what we have to the user */ |
Pekka Paalanen | 6c6c279 | 2008-05-12 21:21:02 +0200 | [diff] [blame] | 2588 | sret = trace_seq_to_user(&iter->seq, ubuf, cnt); |
| 2589 | if (iter->seq.readpos >= iter->seq.len) |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2590 | trace_seq_reset(&iter->seq); |
Pekka Paalanen | 6c6c279 | 2008-05-12 21:21:02 +0200 | [diff] [blame] | 2591 | if (sret == -EBUSY) |
| 2592 | sret = 0; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2593 | |
Steven Rostedt | 107bad8 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2594 | out: |
| 2595 | mutex_unlock(&trace_types_lock); |
| 2596 | |
Pekka Paalanen | 6c6c279 | 2008-05-12 21:21:02 +0200 | [diff] [blame] | 2597 | return sret; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2598 | } |
| 2599 | |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 2600 | static ssize_t |
| 2601 | tracing_entries_read(struct file *filp, char __user *ubuf, |
| 2602 | size_t cnt, loff_t *ppos) |
| 2603 | { |
| 2604 | struct trace_array *tr = filp->private_data; |
| 2605 | char buf[64]; |
| 2606 | int r; |
| 2607 | |
| 2608 | r = sprintf(buf, "%lu\n", tr->entries); |
| 2609 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
| 2610 | } |
| 2611 | |
| 2612 | static ssize_t |
| 2613 | tracing_entries_write(struct file *filp, const char __user *ubuf, |
| 2614 | size_t cnt, loff_t *ppos) |
| 2615 | { |
| 2616 | unsigned long val; |
| 2617 | char buf[64]; |
Steven Rostedt | 19384c0 | 2008-05-22 00:22:16 -0400 | [diff] [blame] | 2618 | int i, ret; |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 2619 | |
Steven Rostedt | cffae43 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 2620 | if (cnt >= sizeof(buf)) |
| 2621 | return -EINVAL; |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 2622 | |
| 2623 | if (copy_from_user(&buf, ubuf, cnt)) |
| 2624 | return -EFAULT; |
| 2625 | |
| 2626 | buf[cnt] = 0; |
| 2627 | |
Steven Rostedt | c6caeeb | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 2628 | ret = strict_strtoul(buf, 10, &val); |
| 2629 | if (ret < 0) |
| 2630 | return ret; |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 2631 | |
| 2632 | /* must have at least 1 entry */ |
| 2633 | if (!val) |
| 2634 | return -EINVAL; |
| 2635 | |
| 2636 | mutex_lock(&trace_types_lock); |
| 2637 | |
| 2638 | if (current_trace != &no_tracer) { |
| 2639 | cnt = -EBUSY; |
| 2640 | pr_info("ftrace: set current_tracer to none" |
| 2641 | " before modifying buffer size\n"); |
| 2642 | goto out; |
| 2643 | } |
| 2644 | |
| 2645 | if (val > global_trace.entries) { |
Steven Rostedt | 3eefae9 | 2008-05-12 21:21:04 +0200 | [diff] [blame] | 2646 | long pages_requested; |
| 2647 | unsigned long freeable_pages; |
| 2648 | |
| 2649 | /* make sure we have enough memory before mapping */ |
| 2650 | pages_requested = |
| 2651 | (val + (ENTRIES_PER_PAGE-1)) / ENTRIES_PER_PAGE; |
| 2652 | |
| 2653 | /* account for each buffer (and max_tr) */ |
| 2654 | pages_requested *= tracing_nr_buffers * 2; |
| 2655 | |
| 2656 | /* Check for overflow */ |
| 2657 | if (pages_requested < 0) { |
| 2658 | cnt = -ENOMEM; |
| 2659 | goto out; |
| 2660 | } |
| 2661 | |
| 2662 | freeable_pages = determine_dirtyable_memory(); |
| 2663 | |
| 2664 | /* we only allow to request 1/4 of useable memory */ |
| 2665 | if (pages_requested > |
| 2666 | ((freeable_pages + tracing_pages_allocated) / 4)) { |
| 2667 | cnt = -ENOMEM; |
| 2668 | goto out; |
| 2669 | } |
| 2670 | |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 2671 | while (global_trace.entries < val) { |
| 2672 | if (trace_alloc_page()) { |
| 2673 | cnt = -ENOMEM; |
| 2674 | goto out; |
| 2675 | } |
Steven Rostedt | 3eefae9 | 2008-05-12 21:21:04 +0200 | [diff] [blame] | 2676 | /* double check that we don't go over the known pages */ |
| 2677 | if (tracing_pages_allocated > pages_requested) |
| 2678 | break; |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 2679 | } |
Steven Rostedt | 3eefae9 | 2008-05-12 21:21:04 +0200 | [diff] [blame] | 2680 | |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 2681 | } else { |
| 2682 | /* include the number of entries in val (inc of page entries) */ |
| 2683 | while (global_trace.entries > val + (ENTRIES_PER_PAGE - 1)) |
| 2684 | trace_free_page(); |
| 2685 | } |
| 2686 | |
Steven Rostedt | 19384c0 | 2008-05-22 00:22:16 -0400 | [diff] [blame] | 2687 | /* check integrity */ |
| 2688 | for_each_tracing_cpu(i) |
| 2689 | check_pages(global_trace.data[i]); |
| 2690 | |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 2691 | filp->f_pos += cnt; |
| 2692 | |
Steven Rostedt | 19384c0 | 2008-05-22 00:22:16 -0400 | [diff] [blame] | 2693 | /* If check pages failed, return ENOMEM */ |
| 2694 | if (tracing_disabled) |
| 2695 | cnt = -ENOMEM; |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 2696 | out: |
| 2697 | max_tr.entries = global_trace.entries; |
| 2698 | mutex_unlock(&trace_types_lock); |
| 2699 | |
| 2700 | return cnt; |
| 2701 | } |
| 2702 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2703 | static struct file_operations tracing_max_lat_fops = { |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2704 | .open = tracing_open_generic, |
| 2705 | .read = tracing_max_lat_read, |
| 2706 | .write = tracing_max_lat_write, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2707 | }; |
| 2708 | |
| 2709 | static struct file_operations tracing_ctrl_fops = { |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2710 | .open = tracing_open_generic, |
| 2711 | .read = tracing_ctrl_read, |
| 2712 | .write = tracing_ctrl_write, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2713 | }; |
| 2714 | |
| 2715 | static struct file_operations set_tracer_fops = { |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2716 | .open = tracing_open_generic, |
| 2717 | .read = tracing_set_trace_read, |
| 2718 | .write = tracing_set_trace_write, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2719 | }; |
| 2720 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2721 | static struct file_operations tracing_pipe_fops = { |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2722 | .open = tracing_open_pipe, |
Soeren Sandmann Pedersen | 2a2cc8f | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2723 | .poll = tracing_poll_pipe, |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2724 | .read = tracing_read_pipe, |
| 2725 | .release = tracing_release_pipe, |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2726 | }; |
| 2727 | |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 2728 | static struct file_operations tracing_entries_fops = { |
| 2729 | .open = tracing_open_generic, |
| 2730 | .read = tracing_entries_read, |
| 2731 | .write = tracing_entries_write, |
| 2732 | }; |
| 2733 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2734 | #ifdef CONFIG_DYNAMIC_FTRACE |
| 2735 | |
| 2736 | static ssize_t |
| 2737 | tracing_read_long(struct file *filp, char __user *ubuf, |
| 2738 | size_t cnt, loff_t *ppos) |
| 2739 | { |
| 2740 | unsigned long *p = filp->private_data; |
| 2741 | char buf[64]; |
| 2742 | int r; |
| 2743 | |
| 2744 | r = sprintf(buf, "%ld\n", *p); |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2745 | |
| 2746 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2747 | } |
| 2748 | |
| 2749 | static struct file_operations tracing_read_long_fops = { |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2750 | .open = tracing_open_generic, |
| 2751 | .read = tracing_read_long, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2752 | }; |
| 2753 | #endif |
| 2754 | |
| 2755 | static struct dentry *d_tracer; |
| 2756 | |
| 2757 | struct dentry *tracing_init_dentry(void) |
| 2758 | { |
| 2759 | static int once; |
| 2760 | |
| 2761 | if (d_tracer) |
| 2762 | return d_tracer; |
| 2763 | |
| 2764 | d_tracer = debugfs_create_dir("tracing", NULL); |
| 2765 | |
| 2766 | if (!d_tracer && !once) { |
| 2767 | once = 1; |
| 2768 | pr_warning("Could not create debugfs directory 'tracing'\n"); |
| 2769 | return NULL; |
| 2770 | } |
| 2771 | |
| 2772 | return d_tracer; |
| 2773 | } |
| 2774 | |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 2775 | #ifdef CONFIG_FTRACE_SELFTEST |
| 2776 | /* Let selftest have access to static functions in this file */ |
| 2777 | #include "trace_selftest.c" |
| 2778 | #endif |
| 2779 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2780 | static __init void tracer_init_debugfs(void) |
| 2781 | { |
| 2782 | struct dentry *d_tracer; |
| 2783 | struct dentry *entry; |
| 2784 | |
| 2785 | d_tracer = tracing_init_dentry(); |
| 2786 | |
| 2787 | entry = debugfs_create_file("tracing_enabled", 0644, d_tracer, |
| 2788 | &global_trace, &tracing_ctrl_fops); |
| 2789 | if (!entry) |
| 2790 | pr_warning("Could not create debugfs 'tracing_enabled' entry\n"); |
| 2791 | |
| 2792 | entry = debugfs_create_file("iter_ctrl", 0644, d_tracer, |
| 2793 | NULL, &tracing_iter_fops); |
| 2794 | if (!entry) |
| 2795 | pr_warning("Could not create debugfs 'iter_ctrl' entry\n"); |
| 2796 | |
Ingo Molnar | c7078de | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2797 | entry = debugfs_create_file("tracing_cpumask", 0644, d_tracer, |
| 2798 | NULL, &tracing_cpumask_fops); |
| 2799 | if (!entry) |
| 2800 | pr_warning("Could not create debugfs 'tracing_cpumask' entry\n"); |
| 2801 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2802 | entry = debugfs_create_file("latency_trace", 0444, d_tracer, |
| 2803 | &global_trace, &tracing_lt_fops); |
| 2804 | if (!entry) |
| 2805 | pr_warning("Could not create debugfs 'latency_trace' entry\n"); |
| 2806 | |
| 2807 | entry = debugfs_create_file("trace", 0444, d_tracer, |
| 2808 | &global_trace, &tracing_fops); |
| 2809 | if (!entry) |
| 2810 | pr_warning("Could not create debugfs 'trace' entry\n"); |
| 2811 | |
| 2812 | entry = debugfs_create_file("available_tracers", 0444, d_tracer, |
| 2813 | &global_trace, &show_traces_fops); |
| 2814 | if (!entry) |
| 2815 | pr_warning("Could not create debugfs 'trace' entry\n"); |
| 2816 | |
| 2817 | entry = debugfs_create_file("current_tracer", 0444, d_tracer, |
| 2818 | &global_trace, &set_tracer_fops); |
| 2819 | if (!entry) |
| 2820 | pr_warning("Could not create debugfs 'trace' entry\n"); |
| 2821 | |
| 2822 | entry = debugfs_create_file("tracing_max_latency", 0644, d_tracer, |
| 2823 | &tracing_max_latency, |
| 2824 | &tracing_max_lat_fops); |
| 2825 | if (!entry) |
| 2826 | pr_warning("Could not create debugfs " |
| 2827 | "'tracing_max_latency' entry\n"); |
| 2828 | |
| 2829 | entry = debugfs_create_file("tracing_thresh", 0644, d_tracer, |
| 2830 | &tracing_thresh, &tracing_max_lat_fops); |
| 2831 | if (!entry) |
| 2832 | pr_warning("Could not create debugfs " |
| 2833 | "'tracing_threash' entry\n"); |
Ingo Molnar | 7bd2f24 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 2834 | entry = debugfs_create_file("README", 0644, d_tracer, |
| 2835 | NULL, &tracing_readme_fops); |
| 2836 | if (!entry) |
| 2837 | pr_warning("Could not create debugfs 'README' entry\n"); |
| 2838 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2839 | entry = debugfs_create_file("trace_pipe", 0644, d_tracer, |
| 2840 | NULL, &tracing_pipe_fops); |
| 2841 | if (!entry) |
| 2842 | pr_warning("Could not create debugfs " |
| 2843 | "'tracing_threash' entry\n"); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2844 | |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 2845 | entry = debugfs_create_file("trace_entries", 0644, d_tracer, |
| 2846 | &global_trace, &tracing_entries_fops); |
| 2847 | if (!entry) |
| 2848 | pr_warning("Could not create debugfs " |
| 2849 | "'tracing_threash' entry\n"); |
| 2850 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2851 | #ifdef CONFIG_DYNAMIC_FTRACE |
| 2852 | entry = debugfs_create_file("dyn_ftrace_total_info", 0444, d_tracer, |
| 2853 | &ftrace_update_tot_cnt, |
| 2854 | &tracing_read_long_fops); |
| 2855 | if (!entry) |
| 2856 | pr_warning("Could not create debugfs " |
| 2857 | "'dyn_ftrace_total_info' entry\n"); |
| 2858 | #endif |
| 2859 | } |
| 2860 | |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2861 | static int trace_alloc_page(void) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2862 | { |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2863 | struct trace_array_cpu *data; |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2864 | struct page *page, *tmp; |
| 2865 | LIST_HEAD(pages); |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 2866 | void *array; |
Steven Rostedt | 3eefae9 | 2008-05-12 21:21:04 +0200 | [diff] [blame] | 2867 | unsigned pages_allocated = 0; |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2868 | int i; |
| 2869 | |
| 2870 | /* first allocate a page for each CPU */ |
Steven Rostedt | ab46428 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 2871 | for_each_tracing_cpu(i) { |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2872 | array = (void *)__get_free_page(GFP_KERNEL); |
| 2873 | if (array == NULL) { |
| 2874 | printk(KERN_ERR "tracer: failed to allocate page" |
| 2875 | "for trace buffer!\n"); |
| 2876 | goto free_pages; |
| 2877 | } |
| 2878 | |
Steven Rostedt | 3eefae9 | 2008-05-12 21:21:04 +0200 | [diff] [blame] | 2879 | pages_allocated++; |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2880 | page = virt_to_page(array); |
| 2881 | list_add(&page->lru, &pages); |
| 2882 | |
| 2883 | /* Only allocate if we are actually using the max trace */ |
| 2884 | #ifdef CONFIG_TRACER_MAX_TRACE |
| 2885 | array = (void *)__get_free_page(GFP_KERNEL); |
| 2886 | if (array == NULL) { |
| 2887 | printk(KERN_ERR "tracer: failed to allocate page" |
| 2888 | "for trace buffer!\n"); |
| 2889 | goto free_pages; |
| 2890 | } |
Steven Rostedt | 3eefae9 | 2008-05-12 21:21:04 +0200 | [diff] [blame] | 2891 | pages_allocated++; |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2892 | page = virt_to_page(array); |
| 2893 | list_add(&page->lru, &pages); |
| 2894 | #endif |
| 2895 | } |
| 2896 | |
| 2897 | /* Now that we successfully allocate a page per CPU, add them */ |
Steven Rostedt | ab46428 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 2898 | for_each_tracing_cpu(i) { |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2899 | data = global_trace.data[i]; |
| 2900 | page = list_entry(pages.next, struct page, lru); |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 2901 | list_del_init(&page->lru); |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2902 | list_add_tail(&page->lru, &data->trace_pages); |
| 2903 | ClearPageLRU(page); |
| 2904 | |
| 2905 | #ifdef CONFIG_TRACER_MAX_TRACE |
| 2906 | data = max_tr.data[i]; |
| 2907 | page = list_entry(pages.next, struct page, lru); |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 2908 | list_del_init(&page->lru); |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2909 | list_add_tail(&page->lru, &data->trace_pages); |
| 2910 | SetPageLRU(page); |
| 2911 | #endif |
| 2912 | } |
Steven Rostedt | 3eefae9 | 2008-05-12 21:21:04 +0200 | [diff] [blame] | 2913 | tracing_pages_allocated += pages_allocated; |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2914 | global_trace.entries += ENTRIES_PER_PAGE; |
| 2915 | |
| 2916 | return 0; |
| 2917 | |
| 2918 | free_pages: |
| 2919 | list_for_each_entry_safe(page, tmp, &pages, lru) { |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 2920 | list_del_init(&page->lru); |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2921 | __free_page(page); |
| 2922 | } |
| 2923 | return -ENOMEM; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2924 | } |
| 2925 | |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 2926 | static int trace_free_page(void) |
| 2927 | { |
| 2928 | struct trace_array_cpu *data; |
| 2929 | struct page *page; |
| 2930 | struct list_head *p; |
| 2931 | int i; |
| 2932 | int ret = 0; |
| 2933 | |
| 2934 | /* free one page from each buffer */ |
Steven Rostedt | ab46428 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 2935 | for_each_tracing_cpu(i) { |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 2936 | data = global_trace.data[i]; |
| 2937 | p = data->trace_pages.next; |
| 2938 | if (p == &data->trace_pages) { |
| 2939 | /* should never happen */ |
| 2940 | WARN_ON(1); |
| 2941 | tracing_disabled = 1; |
| 2942 | ret = -1; |
| 2943 | break; |
| 2944 | } |
| 2945 | page = list_entry(p, struct page, lru); |
| 2946 | ClearPageLRU(page); |
| 2947 | list_del(&page->lru); |
Steven Rostedt | 3eefae9 | 2008-05-12 21:21:04 +0200 | [diff] [blame] | 2948 | tracing_pages_allocated--; |
| 2949 | tracing_pages_allocated--; |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 2950 | __free_page(page); |
| 2951 | |
| 2952 | tracing_reset(data); |
| 2953 | |
| 2954 | #ifdef CONFIG_TRACER_MAX_TRACE |
| 2955 | data = max_tr.data[i]; |
| 2956 | p = data->trace_pages.next; |
| 2957 | if (p == &data->trace_pages) { |
| 2958 | /* should never happen */ |
| 2959 | WARN_ON(1); |
| 2960 | tracing_disabled = 1; |
| 2961 | ret = -1; |
| 2962 | break; |
| 2963 | } |
| 2964 | page = list_entry(p, struct page, lru); |
| 2965 | ClearPageLRU(page); |
| 2966 | list_del(&page->lru); |
| 2967 | __free_page(page); |
| 2968 | |
| 2969 | tracing_reset(data); |
| 2970 | #endif |
| 2971 | } |
| 2972 | global_trace.entries -= ENTRIES_PER_PAGE; |
| 2973 | |
| 2974 | return ret; |
| 2975 | } |
| 2976 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2977 | __init static int tracer_alloc_buffers(void) |
| 2978 | { |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2979 | struct trace_array_cpu *data; |
| 2980 | void *array; |
| 2981 | struct page *page; |
| 2982 | int pages = 0; |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 2983 | int ret = -ENOMEM; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2984 | int i; |
| 2985 | |
Steven Rostedt | ab46428 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 2986 | /* TODO: make the number of buffers hot pluggable with CPUS */ |
| 2987 | tracing_nr_buffers = num_possible_cpus(); |
| 2988 | tracing_buffer_mask = cpu_possible_map; |
| 2989 | |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2990 | /* Allocate the first page for all buffers */ |
Steven Rostedt | ab46428 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 2991 | for_each_tracing_cpu(i) { |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2992 | data = global_trace.data[i] = &per_cpu(global_trace_cpu, i); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2993 | max_tr.data[i] = &per_cpu(max_data, i); |
| 2994 | |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2995 | array = (void *)__get_free_page(GFP_KERNEL); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2996 | if (array == NULL) { |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2997 | printk(KERN_ERR "tracer: failed to allocate page" |
| 2998 | "for trace buffer!\n"); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2999 | goto free_buffers; |
| 3000 | } |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 3001 | |
| 3002 | /* set the array to the list */ |
| 3003 | INIT_LIST_HEAD(&data->trace_pages); |
| 3004 | page = virt_to_page(array); |
| 3005 | list_add(&page->lru, &data->trace_pages); |
| 3006 | /* use the LRU flag to differentiate the two buffers */ |
| 3007 | ClearPageLRU(page); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3008 | |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 3009 | data->lock = (raw_spinlock_t)__RAW_SPIN_LOCK_UNLOCKED; |
| 3010 | max_tr.data[i]->lock = (raw_spinlock_t)__RAW_SPIN_LOCK_UNLOCKED; |
| 3011 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3012 | /* Only allocate if we are actually using the max trace */ |
| 3013 | #ifdef CONFIG_TRACER_MAX_TRACE |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 3014 | array = (void *)__get_free_page(GFP_KERNEL); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3015 | if (array == NULL) { |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 3016 | printk(KERN_ERR "tracer: failed to allocate page" |
| 3017 | "for trace buffer!\n"); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3018 | goto free_buffers; |
| 3019 | } |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 3020 | |
| 3021 | INIT_LIST_HEAD(&max_tr.data[i]->trace_pages); |
| 3022 | page = virt_to_page(array); |
| 3023 | list_add(&page->lru, &max_tr.data[i]->trace_pages); |
| 3024 | SetPageLRU(page); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3025 | #endif |
| 3026 | } |
| 3027 | |
| 3028 | /* |
| 3029 | * Since we allocate by orders of pages, we may be able to |
| 3030 | * round up a bit. |
| 3031 | */ |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 3032 | global_trace.entries = ENTRIES_PER_PAGE; |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 3033 | pages++; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3034 | |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 3035 | while (global_trace.entries < trace_nr_entries) { |
| 3036 | if (trace_alloc_page()) |
| 3037 | break; |
| 3038 | pages++; |
| 3039 | } |
Steven Rostedt | 89b2f97 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 3040 | max_tr.entries = global_trace.entries; |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 3041 | |
| 3042 | pr_info("tracer: %d pages allocated for %ld", |
| 3043 | pages, trace_nr_entries); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3044 | pr_info(" entries of %ld bytes\n", (long)TRACE_ENTRY_SIZE); |
| 3045 | pr_info(" actual entries %ld\n", global_trace.entries); |
| 3046 | |
| 3047 | tracer_init_debugfs(); |
| 3048 | |
| 3049 | trace_init_cmdlines(); |
| 3050 | |
| 3051 | register_tracer(&no_tracer); |
| 3052 | current_trace = &no_tracer; |
| 3053 | |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 3054 | /* All seems OK, enable tracing */ |
Steven Rostedt | 4902f88 | 2008-05-22 00:22:18 -0400 | [diff] [blame] | 3055 | global_trace.ctrl = tracer_enabled; |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 3056 | tracing_disabled = 0; |
| 3057 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3058 | return 0; |
| 3059 | |
| 3060 | free_buffers: |
| 3061 | for (i-- ; i >= 0; i--) { |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 3062 | struct page *page, *tmp; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3063 | struct trace_array_cpu *data = global_trace.data[i]; |
| 3064 | |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 3065 | if (data) { |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 3066 | list_for_each_entry_safe(page, tmp, |
| 3067 | &data->trace_pages, lru) { |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 3068 | list_del_init(&page->lru); |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 3069 | __free_page(page); |
| 3070 | } |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3071 | } |
| 3072 | |
| 3073 | #ifdef CONFIG_TRACER_MAX_TRACE |
| 3074 | data = max_tr.data[i]; |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 3075 | if (data) { |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 3076 | list_for_each_entry_safe(page, tmp, |
| 3077 | &data->trace_pages, lru) { |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 3078 | list_del_init(&page->lru); |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 3079 | __free_page(page); |
| 3080 | } |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3081 | } |
| 3082 | #endif |
| 3083 | } |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 3084 | return ret; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3085 | } |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 3086 | fs_initcall(tracer_alloc_buffers); |