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> |
| 30 | |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 31 | #include <linux/stacktrace.h> |
| 32 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 33 | #include "trace.h" |
| 34 | |
| 35 | unsigned long __read_mostly tracing_max_latency = (cycle_t)ULONG_MAX; |
| 36 | unsigned long __read_mostly tracing_thresh; |
| 37 | |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 38 | static int tracing_disabled = 1; |
| 39 | |
Thomas Gleixner | 72829bc | 2008-05-23 21:37:28 +0200 | [diff] [blame^] | 40 | long |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 41 | ns2usecs(cycle_t nsec) |
| 42 | { |
| 43 | nsec += 500; |
| 44 | do_div(nsec, 1000); |
| 45 | return nsec; |
| 46 | } |
| 47 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 48 | cycle_t ftrace_now(int cpu) |
Ingo Molnar | 750ed1a | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 49 | { |
Ingo Molnar | 0fd9e0d | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 50 | return cpu_clock(cpu); |
Ingo Molnar | 750ed1a | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 51 | } |
| 52 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 53 | static struct trace_array global_trace; |
| 54 | |
| 55 | static DEFINE_PER_CPU(struct trace_array_cpu, global_trace_cpu); |
| 56 | |
| 57 | static struct trace_array max_tr; |
| 58 | |
| 59 | static DEFINE_PER_CPU(struct trace_array_cpu, max_data); |
| 60 | |
Steven Rostedt | 26994ea | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 61 | static int tracer_enabled = 1; |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 62 | static unsigned long trace_nr_entries = 65536UL; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 63 | |
| 64 | static struct tracer *trace_types __read_mostly; |
| 65 | static struct tracer *current_trace __read_mostly; |
| 66 | static int max_tracer_type_len; |
| 67 | |
| 68 | static DEFINE_MUTEX(trace_types_lock); |
Ingo Molnar | 4e65551 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 69 | static DECLARE_WAIT_QUEUE_HEAD(trace_wait); |
| 70 | |
| 71 | unsigned long trace_flags = TRACE_ITER_PRINT_PARENT; |
| 72 | |
Ingo Molnar | 4e65551 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 73 | void trace_wake_up(void) |
| 74 | { |
Ingo Molnar | 017730c | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 75 | /* |
| 76 | * The runqueue_is_locked() can fail, but this is the best we |
| 77 | * have for now: |
| 78 | */ |
| 79 | if (!(trace_flags & TRACE_ITER_BLOCK) && !runqueue_is_locked()) |
Ingo Molnar | 4e65551 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 80 | wake_up(&trace_wait); |
| 81 | } |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 82 | |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 83 | #define ENTRIES_PER_PAGE (PAGE_SIZE / sizeof(struct trace_entry)) |
| 84 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 85 | static int __init set_nr_entries(char *str) |
| 86 | { |
| 87 | if (!str) |
| 88 | return 0; |
| 89 | trace_nr_entries = simple_strtoul(str, &str, 0); |
| 90 | return 1; |
| 91 | } |
| 92 | __setup("trace_entries=", set_nr_entries); |
| 93 | |
Steven Rostedt | 57f50be | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 94 | unsigned long nsecs_to_usecs(unsigned long nsecs) |
| 95 | { |
| 96 | return nsecs / 1000; |
| 97 | } |
| 98 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 99 | enum trace_flag_type { |
| 100 | TRACE_FLAG_IRQS_OFF = 0x01, |
| 101 | TRACE_FLAG_NEED_RESCHED = 0x02, |
| 102 | TRACE_FLAG_HARDIRQ = 0x04, |
| 103 | TRACE_FLAG_SOFTIRQ = 0x08, |
| 104 | }; |
| 105 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 106 | #define TRACE_ITER_SYM_MASK \ |
| 107 | (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR) |
| 108 | |
| 109 | /* These must match the bit postions above */ |
| 110 | static const char *trace_options[] = { |
| 111 | "print-parent", |
| 112 | "sym-offset", |
| 113 | "sym-addr", |
| 114 | "verbose", |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 115 | "raw", |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 116 | "hex", |
Ingo Molnar | cb0f12a | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 117 | "bin", |
Soeren Sandmann Pedersen | 2a2cc8f | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 118 | "block", |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 119 | "stacktrace", |
Ingo Molnar | 4ac3ba4 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 120 | "sched-tree", |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 121 | NULL |
| 122 | }; |
| 123 | |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 124 | static raw_spinlock_t ftrace_max_lock = |
| 125 | (raw_spinlock_t)__RAW_SPIN_LOCK_UNLOCKED; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 126 | |
| 127 | /* |
| 128 | * Copy the new maximum trace into the separate maximum-trace |
| 129 | * structure. (this way the maximum trace is permanently saved, |
| 130 | * for later retrieval via /debugfs/tracing/latency_trace) |
| 131 | */ |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 132 | static void |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 133 | __update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu) |
| 134 | { |
| 135 | struct trace_array_cpu *data = tr->data[cpu]; |
| 136 | |
| 137 | max_tr.cpu = cpu; |
| 138 | max_tr.time_start = data->preempt_timestamp; |
| 139 | |
| 140 | data = max_tr.data[cpu]; |
| 141 | data->saved_latency = tracing_max_latency; |
| 142 | |
| 143 | memcpy(data->comm, tsk->comm, TASK_COMM_LEN); |
| 144 | data->pid = tsk->pid; |
| 145 | data->uid = tsk->uid; |
| 146 | data->nice = tsk->static_prio - 20 - MAX_RT_PRIO; |
| 147 | data->policy = tsk->policy; |
| 148 | data->rt_priority = tsk->rt_priority; |
| 149 | |
| 150 | /* record this tasks comm */ |
| 151 | tracing_record_cmdline(current); |
| 152 | } |
| 153 | |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 154 | void check_pages(struct trace_array_cpu *data) |
| 155 | { |
| 156 | struct page *page, *tmp; |
| 157 | |
| 158 | BUG_ON(data->trace_pages.next->prev != &data->trace_pages); |
| 159 | BUG_ON(data->trace_pages.prev->next != &data->trace_pages); |
| 160 | |
| 161 | list_for_each_entry_safe(page, tmp, &data->trace_pages, lru) { |
| 162 | BUG_ON(page->lru.next->prev != &page->lru); |
| 163 | BUG_ON(page->lru.prev->next != &page->lru); |
| 164 | } |
| 165 | } |
| 166 | |
| 167 | void *head_page(struct trace_array_cpu *data) |
| 168 | { |
| 169 | struct page *page; |
| 170 | |
| 171 | check_pages(data); |
| 172 | if (list_empty(&data->trace_pages)) |
| 173 | return NULL; |
| 174 | |
| 175 | page = list_entry(data->trace_pages.next, struct page, lru); |
| 176 | BUG_ON(&page->lru == &data->trace_pages); |
| 177 | |
| 178 | return page_address(page); |
| 179 | } |
| 180 | |
Thomas Gleixner | 72829bc | 2008-05-23 21:37:28 +0200 | [diff] [blame^] | 181 | int |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 182 | trace_seq_printf(struct trace_seq *s, const char *fmt, ...) |
| 183 | { |
| 184 | int len = (PAGE_SIZE - 1) - s->len; |
| 185 | va_list ap; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 186 | int ret; |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 187 | |
| 188 | if (!len) |
| 189 | return 0; |
| 190 | |
| 191 | va_start(ap, fmt); |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 192 | ret = vsnprintf(s->buffer + s->len, len, fmt, ap); |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 193 | va_end(ap); |
| 194 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 195 | /* If we can't write it all, don't bother writing anything */ |
Thomas Gleixner | 72829bc | 2008-05-23 21:37:28 +0200 | [diff] [blame^] | 196 | if (ret >= len) |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 197 | return 0; |
| 198 | |
| 199 | s->len += ret; |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 200 | |
| 201 | return len; |
| 202 | } |
| 203 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 204 | static int |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 205 | trace_seq_puts(struct trace_seq *s, const char *str) |
| 206 | { |
| 207 | int len = strlen(str); |
| 208 | |
| 209 | if (len > ((PAGE_SIZE - 1) - s->len)) |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 210 | return 0; |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 211 | |
| 212 | memcpy(s->buffer + s->len, str, len); |
| 213 | s->len += len; |
| 214 | |
| 215 | return len; |
| 216 | } |
| 217 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 218 | static int |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 219 | trace_seq_putc(struct trace_seq *s, unsigned char c) |
| 220 | { |
| 221 | if (s->len >= (PAGE_SIZE - 1)) |
| 222 | return 0; |
| 223 | |
| 224 | s->buffer[s->len++] = c; |
| 225 | |
| 226 | return 1; |
| 227 | } |
| 228 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 229 | static int |
Ingo Molnar | cb0f12a | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 230 | trace_seq_putmem(struct trace_seq *s, void *mem, size_t len) |
| 231 | { |
| 232 | if (len > ((PAGE_SIZE - 1) - s->len)) |
| 233 | return 0; |
| 234 | |
| 235 | memcpy(s->buffer + s->len, mem, len); |
| 236 | s->len += len; |
| 237 | |
| 238 | return len; |
| 239 | } |
| 240 | |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 241 | #define HEX_CHARS 17 |
| 242 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 243 | static int |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 244 | trace_seq_putmem_hex(struct trace_seq *s, void *mem, size_t len) |
| 245 | { |
| 246 | unsigned char hex[HEX_CHARS]; |
| 247 | unsigned char *data; |
| 248 | unsigned char byte; |
| 249 | int i, j; |
| 250 | |
| 251 | BUG_ON(len >= HEX_CHARS); |
| 252 | |
| 253 | data = mem; |
| 254 | |
| 255 | #ifdef __BIG_ENDIAN |
| 256 | for (i = 0, j = 0; i < len; i++) { |
| 257 | #else |
| 258 | for (i = len-1, j = 0; i >= 0; i--) { |
| 259 | #endif |
| 260 | byte = data[i]; |
| 261 | |
| 262 | hex[j] = byte & 0x0f; |
| 263 | if (hex[j] >= 10) |
| 264 | hex[j] += 'a' - 10; |
| 265 | else |
| 266 | hex[j] += '0'; |
| 267 | j++; |
| 268 | |
| 269 | hex[j] = byte >> 4; |
| 270 | if (hex[j] >= 10) |
| 271 | hex[j] += 'a' - 10; |
| 272 | else |
| 273 | hex[j] += '0'; |
| 274 | j++; |
| 275 | } |
| 276 | hex[j] = ' '; |
| 277 | j++; |
| 278 | |
| 279 | return trace_seq_putmem(s, hex, j); |
| 280 | } |
| 281 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 282 | static void |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 283 | trace_seq_reset(struct trace_seq *s) |
| 284 | { |
| 285 | s->len = 0; |
| 286 | } |
| 287 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 288 | static void |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 289 | trace_print_seq(struct seq_file *m, struct trace_seq *s) |
| 290 | { |
| 291 | int len = s->len >= PAGE_SIZE ? PAGE_SIZE - 1 : s->len; |
| 292 | |
| 293 | s->buffer[len] = 0; |
| 294 | seq_puts(m, s->buffer); |
| 295 | |
| 296 | trace_seq_reset(s); |
| 297 | } |
| 298 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 299 | static void |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 300 | flip_trace(struct trace_array_cpu *tr1, struct trace_array_cpu *tr2) |
| 301 | { |
| 302 | struct list_head flip_pages; |
| 303 | |
| 304 | INIT_LIST_HEAD(&flip_pages); |
| 305 | |
Steven Rostedt | 93a588f | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 306 | memcpy(&tr1->trace_head_idx, &tr2->trace_head_idx, |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 307 | sizeof(struct trace_array_cpu) - |
Steven Rostedt | 93a588f | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 308 | offsetof(struct trace_array_cpu, trace_head_idx)); |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 309 | |
| 310 | check_pages(tr1); |
| 311 | check_pages(tr2); |
| 312 | list_splice_init(&tr1->trace_pages, &flip_pages); |
| 313 | list_splice_init(&tr2->trace_pages, &tr1->trace_pages); |
| 314 | list_splice_init(&flip_pages, &tr2->trace_pages); |
| 315 | BUG_ON(!list_empty(&flip_pages)); |
| 316 | check_pages(tr1); |
| 317 | check_pages(tr2); |
| 318 | } |
| 319 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 320 | void |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 321 | update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu) |
| 322 | { |
| 323 | struct trace_array_cpu *data; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 324 | int i; |
| 325 | |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 326 | WARN_ON_ONCE(!irqs_disabled()); |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 327 | __raw_spin_lock(&ftrace_max_lock); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 328 | /* clear out all the previous traces */ |
| 329 | for_each_possible_cpu(i) { |
| 330 | data = tr->data[i]; |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 331 | flip_trace(max_tr.data[i], data); |
Steven Rostedt | 89b2f97 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 332 | tracing_reset(data); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 333 | } |
| 334 | |
| 335 | __update_max_tr(tr, tsk, cpu); |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 336 | __raw_spin_unlock(&ftrace_max_lock); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 337 | } |
| 338 | |
| 339 | /** |
| 340 | * update_max_tr_single - only copy one trace over, and reset the rest |
| 341 | * @tr - tracer |
| 342 | * @tsk - task with the latency |
| 343 | * @cpu - the cpu of the buffer to copy. |
| 344 | */ |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 345 | void |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 346 | update_max_tr_single(struct trace_array *tr, struct task_struct *tsk, int cpu) |
| 347 | { |
| 348 | struct trace_array_cpu *data = tr->data[cpu]; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 349 | int i; |
| 350 | |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 351 | WARN_ON_ONCE(!irqs_disabled()); |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 352 | __raw_spin_lock(&ftrace_max_lock); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 353 | for_each_possible_cpu(i) |
| 354 | tracing_reset(max_tr.data[i]); |
| 355 | |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 356 | flip_trace(max_tr.data[cpu], data); |
Steven Rostedt | 89b2f97 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 357 | tracing_reset(data); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 358 | |
| 359 | __update_max_tr(tr, tsk, cpu); |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 360 | __raw_spin_unlock(&ftrace_max_lock); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 361 | } |
| 362 | |
| 363 | int register_tracer(struct tracer *type) |
| 364 | { |
| 365 | struct tracer *t; |
| 366 | int len; |
| 367 | int ret = 0; |
| 368 | |
| 369 | if (!type->name) { |
| 370 | pr_info("Tracer must have a name\n"); |
| 371 | return -1; |
| 372 | } |
| 373 | |
| 374 | mutex_lock(&trace_types_lock); |
| 375 | for (t = trace_types; t; t = t->next) { |
| 376 | if (strcmp(type->name, t->name) == 0) { |
| 377 | /* already found */ |
| 378 | pr_info("Trace %s already registered\n", |
| 379 | type->name); |
| 380 | ret = -1; |
| 381 | goto out; |
| 382 | } |
| 383 | } |
| 384 | |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 385 | #ifdef CONFIG_FTRACE_STARTUP_TEST |
| 386 | if (type->selftest) { |
| 387 | struct tracer *saved_tracer = current_trace; |
| 388 | struct trace_array_cpu *data; |
| 389 | struct trace_array *tr = &global_trace; |
| 390 | int saved_ctrl = tr->ctrl; |
| 391 | int i; |
| 392 | /* |
| 393 | * Run a selftest on this tracer. |
| 394 | * Here we reset the trace buffer, and set the current |
| 395 | * tracer to be this tracer. The tracer can then run some |
| 396 | * internal tracing to verify that everything is in order. |
| 397 | * If we fail, we do not register this tracer. |
| 398 | */ |
| 399 | for_each_possible_cpu(i) { |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 400 | data = tr->data[i]; |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 401 | if (!head_page(data)) |
| 402 | continue; |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 403 | tracing_reset(data); |
| 404 | } |
| 405 | current_trace = type; |
| 406 | tr->ctrl = 0; |
| 407 | /* the test is responsible for initializing and enabling */ |
| 408 | pr_info("Testing tracer %s: ", type->name); |
| 409 | ret = type->selftest(type, tr); |
| 410 | /* the test is responsible for resetting too */ |
| 411 | current_trace = saved_tracer; |
| 412 | tr->ctrl = saved_ctrl; |
| 413 | if (ret) { |
| 414 | printk(KERN_CONT "FAILED!\n"); |
| 415 | goto out; |
| 416 | } |
Steven Rostedt | 1d4db00 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 417 | /* Only reset on passing, to avoid touching corrupted buffers */ |
| 418 | for_each_possible_cpu(i) { |
| 419 | data = tr->data[i]; |
| 420 | if (!head_page(data)) |
| 421 | continue; |
| 422 | tracing_reset(data); |
| 423 | } |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 424 | printk(KERN_CONT "PASSED\n"); |
| 425 | } |
| 426 | #endif |
| 427 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 428 | type->next = trace_types; |
| 429 | trace_types = type; |
| 430 | len = strlen(type->name); |
| 431 | if (len > max_tracer_type_len) |
| 432 | max_tracer_type_len = len; |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 433 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 434 | out: |
| 435 | mutex_unlock(&trace_types_lock); |
| 436 | |
| 437 | return ret; |
| 438 | } |
| 439 | |
| 440 | void unregister_tracer(struct tracer *type) |
| 441 | { |
| 442 | struct tracer **t; |
| 443 | int len; |
| 444 | |
| 445 | mutex_lock(&trace_types_lock); |
| 446 | for (t = &trace_types; *t; t = &(*t)->next) { |
| 447 | if (*t == type) |
| 448 | goto found; |
| 449 | } |
| 450 | pr_info("Trace %s not registered\n", type->name); |
| 451 | goto out; |
| 452 | |
| 453 | found: |
| 454 | *t = (*t)->next; |
| 455 | if (strlen(type->name) != max_tracer_type_len) |
| 456 | goto out; |
| 457 | |
| 458 | max_tracer_type_len = 0; |
| 459 | for (t = &trace_types; *t; t = &(*t)->next) { |
| 460 | len = strlen((*t)->name); |
| 461 | if (len > max_tracer_type_len) |
| 462 | max_tracer_type_len = len; |
| 463 | } |
| 464 | out: |
| 465 | mutex_unlock(&trace_types_lock); |
| 466 | } |
| 467 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 468 | void tracing_reset(struct trace_array_cpu *data) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 469 | { |
| 470 | data->trace_idx = 0; |
Steven Rostedt | 93a588f | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 471 | data->trace_head = data->trace_tail = head_page(data); |
| 472 | data->trace_head_idx = 0; |
| 473 | data->trace_tail_idx = 0; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 474 | } |
| 475 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 476 | #define SAVED_CMDLINES 128 |
| 477 | static unsigned map_pid_to_cmdline[PID_MAX_DEFAULT+1]; |
| 478 | static unsigned map_cmdline_to_pid[SAVED_CMDLINES]; |
| 479 | static char saved_cmdlines[SAVED_CMDLINES][TASK_COMM_LEN]; |
| 480 | static int cmdline_idx; |
| 481 | static DEFINE_SPINLOCK(trace_cmdline_lock); |
| 482 | atomic_t trace_record_cmdline_disabled; |
| 483 | |
| 484 | static void trace_init_cmdlines(void) |
| 485 | { |
| 486 | memset(&map_pid_to_cmdline, -1, sizeof(map_pid_to_cmdline)); |
| 487 | memset(&map_cmdline_to_pid, -1, sizeof(map_cmdline_to_pid)); |
| 488 | cmdline_idx = 0; |
| 489 | } |
| 490 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 491 | void trace_stop_cmdline_recording(void); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 492 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 493 | static void trace_save_cmdline(struct task_struct *tsk) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 494 | { |
| 495 | unsigned map; |
| 496 | unsigned idx; |
| 497 | |
| 498 | if (!tsk->pid || unlikely(tsk->pid > PID_MAX_DEFAULT)) |
| 499 | return; |
| 500 | |
| 501 | /* |
| 502 | * It's not the end of the world if we don't get |
| 503 | * the lock, but we also don't want to spin |
| 504 | * nor do we want to disable interrupts, |
| 505 | * so if we miss here, then better luck next time. |
| 506 | */ |
| 507 | if (!spin_trylock(&trace_cmdline_lock)) |
| 508 | return; |
| 509 | |
| 510 | idx = map_pid_to_cmdline[tsk->pid]; |
| 511 | if (idx >= SAVED_CMDLINES) { |
| 512 | idx = (cmdline_idx + 1) % SAVED_CMDLINES; |
| 513 | |
| 514 | map = map_cmdline_to_pid[idx]; |
| 515 | if (map <= PID_MAX_DEFAULT) |
| 516 | map_pid_to_cmdline[map] = (unsigned)-1; |
| 517 | |
| 518 | map_pid_to_cmdline[tsk->pid] = idx; |
| 519 | |
| 520 | cmdline_idx = idx; |
| 521 | } |
| 522 | |
| 523 | memcpy(&saved_cmdlines[idx], tsk->comm, TASK_COMM_LEN); |
| 524 | |
| 525 | spin_unlock(&trace_cmdline_lock); |
| 526 | } |
| 527 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 528 | static char *trace_find_cmdline(int pid) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 529 | { |
| 530 | char *cmdline = "<...>"; |
| 531 | unsigned map; |
| 532 | |
| 533 | if (!pid) |
| 534 | return "<idle>"; |
| 535 | |
| 536 | if (pid > PID_MAX_DEFAULT) |
| 537 | goto out; |
| 538 | |
| 539 | map = map_pid_to_cmdline[pid]; |
| 540 | if (map >= SAVED_CMDLINES) |
| 541 | goto out; |
| 542 | |
| 543 | cmdline = saved_cmdlines[map]; |
| 544 | |
| 545 | out: |
| 546 | return cmdline; |
| 547 | } |
| 548 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 549 | void tracing_record_cmdline(struct task_struct *tsk) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 550 | { |
| 551 | if (atomic_read(&trace_record_cmdline_disabled)) |
| 552 | return; |
| 553 | |
| 554 | trace_save_cmdline(tsk); |
| 555 | } |
| 556 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 557 | static inline struct list_head * |
Steven Rostedt | 93a588f | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 558 | trace_next_list(struct trace_array_cpu *data, struct list_head *next) |
| 559 | { |
| 560 | /* |
| 561 | * Roundrobin - but skip the head (which is not a real page): |
| 562 | */ |
| 563 | next = next->next; |
| 564 | if (unlikely(next == &data->trace_pages)) |
| 565 | next = next->next; |
| 566 | BUG_ON(next == &data->trace_pages); |
| 567 | |
| 568 | return next; |
| 569 | } |
| 570 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 571 | static inline void * |
Steven Rostedt | 93a588f | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 572 | trace_next_page(struct trace_array_cpu *data, void *addr) |
| 573 | { |
| 574 | struct list_head *next; |
| 575 | struct page *page; |
| 576 | |
| 577 | page = virt_to_page(addr); |
| 578 | |
| 579 | next = trace_next_list(data, &page->lru); |
| 580 | page = list_entry(next, struct page, lru); |
| 581 | |
| 582 | return page_address(page); |
| 583 | } |
| 584 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 585 | static inline struct trace_entry * |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 586 | 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] | 587 | { |
| 588 | unsigned long idx, idx_next; |
| 589 | struct trace_entry *entry; |
| 590 | |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 591 | data->trace_idx++; |
Steven Rostedt | 93a588f | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 592 | idx = data->trace_head_idx; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 593 | idx_next = idx + 1; |
| 594 | |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 595 | BUG_ON(idx * TRACE_ENTRY_SIZE >= PAGE_SIZE); |
| 596 | |
Steven Rostedt | 93a588f | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 597 | entry = data->trace_head + idx * TRACE_ENTRY_SIZE; |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 598 | |
| 599 | if (unlikely(idx_next >= ENTRIES_PER_PAGE)) { |
Steven Rostedt | 93a588f | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 600 | data->trace_head = trace_next_page(data, data->trace_head); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 601 | idx_next = 0; |
| 602 | } |
| 603 | |
Steven Rostedt | 93a588f | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 604 | if (data->trace_head == data->trace_tail && |
| 605 | idx_next == data->trace_tail_idx) { |
| 606 | /* overrun */ |
| 607 | data->trace_tail_idx++; |
| 608 | if (data->trace_tail_idx >= ENTRIES_PER_PAGE) { |
| 609 | data->trace_tail = |
| 610 | trace_next_page(data, data->trace_tail); |
| 611 | data->trace_tail_idx = 0; |
| 612 | } |
| 613 | } |
| 614 | |
| 615 | data->trace_head_idx = idx_next; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 616 | |
| 617 | return entry; |
| 618 | } |
| 619 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 620 | static inline void |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 621 | tracing_generic_entry_update(struct trace_entry *entry, unsigned long flags) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 622 | { |
| 623 | struct task_struct *tsk = current; |
| 624 | unsigned long pc; |
| 625 | |
| 626 | pc = preempt_count(); |
| 627 | |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 628 | entry->preempt_count = pc & 0xff; |
Thomas Gleixner | 72829bc | 2008-05-23 21:37:28 +0200 | [diff] [blame^] | 629 | entry->pid = (tsk) ? tsk->pid : 0; |
Ingo Molnar | 750ed1a | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 630 | entry->t = ftrace_now(raw_smp_processor_id()); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 631 | entry->flags = (irqs_disabled_flags(flags) ? TRACE_FLAG_IRQS_OFF : 0) | |
| 632 | ((pc & HARDIRQ_MASK) ? TRACE_FLAG_HARDIRQ : 0) | |
| 633 | ((pc & SOFTIRQ_MASK) ? TRACE_FLAG_SOFTIRQ : 0) | |
| 634 | (need_resched() ? TRACE_FLAG_NEED_RESCHED : 0); |
| 635 | } |
| 636 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 637 | void |
Steven Rostedt | 6fb44b7 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 638 | trace_function(struct trace_array *tr, struct trace_array_cpu *data, |
| 639 | unsigned long ip, unsigned long parent_ip, unsigned long flags) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 640 | { |
| 641 | struct trace_entry *entry; |
Ingo Molnar | dcb6308 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 642 | unsigned long irq_flags; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 643 | |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 644 | raw_local_irq_save(irq_flags); |
| 645 | __raw_spin_lock(&data->lock); |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 646 | entry = tracing_get_trace_entry(tr, data); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 647 | tracing_generic_entry_update(entry, flags); |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 648 | entry->type = TRACE_FN; |
| 649 | entry->fn.ip = ip; |
| 650 | entry->fn.parent_ip = parent_ip; |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 651 | __raw_spin_unlock(&data->lock); |
| 652 | raw_local_irq_restore(irq_flags); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 653 | } |
| 654 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 655 | void |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 656 | ftrace(struct trace_array *tr, struct trace_array_cpu *data, |
| 657 | unsigned long ip, unsigned long parent_ip, unsigned long flags) |
| 658 | { |
| 659 | if (likely(!atomic_read(&data->disabled))) |
Steven Rostedt | 6fb44b7 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 660 | trace_function(tr, data, ip, parent_ip, flags); |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 661 | } |
| 662 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 663 | void |
Ingo Molnar | 4e65551 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 664 | __trace_special(void *__tr, void *__data, |
| 665 | unsigned long arg1, unsigned long arg2, unsigned long arg3) |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 666 | { |
Ingo Molnar | 4e65551 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 667 | struct trace_array_cpu *data = __data; |
| 668 | struct trace_array *tr = __tr; |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 669 | struct trace_entry *entry; |
Ingo Molnar | dcb6308 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 670 | unsigned long irq_flags; |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 671 | |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 672 | raw_local_irq_save(irq_flags); |
| 673 | __raw_spin_lock(&data->lock); |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 674 | entry = tracing_get_trace_entry(tr, data); |
| 675 | tracing_generic_entry_update(entry, 0); |
| 676 | entry->type = TRACE_SPECIAL; |
| 677 | entry->special.arg1 = arg1; |
| 678 | entry->special.arg2 = arg2; |
| 679 | entry->special.arg3 = arg3; |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 680 | __raw_spin_unlock(&data->lock); |
| 681 | raw_local_irq_restore(irq_flags); |
Ingo Molnar | 017730c | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 682 | |
| 683 | trace_wake_up(); |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 684 | } |
| 685 | |
| 686 | void __trace_stack(struct trace_array *tr, |
| 687 | struct trace_array_cpu *data, |
| 688 | unsigned long flags, |
| 689 | int skip) |
| 690 | { |
| 691 | struct trace_entry *entry; |
| 692 | struct stack_trace trace; |
| 693 | |
| 694 | if (!(trace_flags & TRACE_ITER_STACKTRACE)) |
| 695 | return; |
| 696 | |
| 697 | entry = tracing_get_trace_entry(tr, data); |
| 698 | tracing_generic_entry_update(entry, flags); |
| 699 | entry->type = TRACE_STACK; |
| 700 | |
| 701 | memset(&entry->stack, 0, sizeof(entry->stack)); |
| 702 | |
| 703 | trace.nr_entries = 0; |
| 704 | trace.max_entries = FTRACE_STACK_ENTRIES; |
| 705 | trace.skip = skip; |
| 706 | trace.entries = entry->stack.caller; |
| 707 | |
| 708 | save_stack_trace(&trace); |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 709 | } |
| 710 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 711 | void |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 712 | tracing_sched_switch_trace(struct trace_array *tr, |
| 713 | struct trace_array_cpu *data, |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 714 | struct task_struct *prev, |
| 715 | struct task_struct *next, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 716 | unsigned long flags) |
| 717 | { |
| 718 | struct trace_entry *entry; |
Ingo Molnar | dcb6308 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 719 | unsigned long irq_flags; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 720 | |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 721 | raw_local_irq_save(irq_flags); |
| 722 | __raw_spin_lock(&data->lock); |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 723 | entry = tracing_get_trace_entry(tr, data); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 724 | tracing_generic_entry_update(entry, flags); |
| 725 | entry->type = TRACE_CTX; |
| 726 | entry->ctx.prev_pid = prev->pid; |
| 727 | entry->ctx.prev_prio = prev->prio; |
| 728 | entry->ctx.prev_state = prev->state; |
| 729 | entry->ctx.next_pid = next->pid; |
| 730 | entry->ctx.next_prio = next->prio; |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 731 | entry->ctx.next_state = next->state; |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 732 | __trace_stack(tr, data, flags, 4); |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 733 | __raw_spin_unlock(&data->lock); |
| 734 | raw_local_irq_restore(irq_flags); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 735 | } |
| 736 | |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 737 | void |
| 738 | tracing_sched_wakeup_trace(struct trace_array *tr, |
| 739 | struct trace_array_cpu *data, |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 740 | struct task_struct *wakee, |
| 741 | struct task_struct *curr, |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 742 | unsigned long flags) |
| 743 | { |
| 744 | struct trace_entry *entry; |
| 745 | unsigned long irq_flags; |
| 746 | |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 747 | raw_local_irq_save(irq_flags); |
| 748 | __raw_spin_lock(&data->lock); |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 749 | entry = tracing_get_trace_entry(tr, data); |
| 750 | tracing_generic_entry_update(entry, flags); |
| 751 | entry->type = TRACE_WAKE; |
| 752 | entry->ctx.prev_pid = curr->pid; |
| 753 | entry->ctx.prev_prio = curr->prio; |
| 754 | entry->ctx.prev_state = curr->state; |
| 755 | entry->ctx.next_pid = wakee->pid; |
| 756 | entry->ctx.next_prio = wakee->prio; |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 757 | entry->ctx.next_state = wakee->state; |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 758 | __trace_stack(tr, data, flags, 5); |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 759 | __raw_spin_unlock(&data->lock); |
| 760 | raw_local_irq_restore(irq_flags); |
Ingo Molnar | 017730c | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 761 | |
| 762 | trace_wake_up(); |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 763 | } |
| 764 | |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 765 | #ifdef CONFIG_FTRACE |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 766 | static void |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 767 | function_trace_call(unsigned long ip, unsigned long parent_ip) |
| 768 | { |
| 769 | struct trace_array *tr = &global_trace; |
| 770 | struct trace_array_cpu *data; |
| 771 | unsigned long flags; |
| 772 | long disabled; |
| 773 | int cpu; |
| 774 | |
| 775 | if (unlikely(!tracer_enabled)) |
| 776 | return; |
| 777 | |
| 778 | local_irq_save(flags); |
| 779 | cpu = raw_smp_processor_id(); |
| 780 | data = tr->data[cpu]; |
| 781 | disabled = atomic_inc_return(&data->disabled); |
| 782 | |
| 783 | if (likely(disabled == 1)) |
Steven Rostedt | 6fb44b7 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 784 | trace_function(tr, data, ip, parent_ip, flags); |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 785 | |
| 786 | atomic_dec(&data->disabled); |
| 787 | local_irq_restore(flags); |
| 788 | } |
| 789 | |
| 790 | static struct ftrace_ops trace_ops __read_mostly = |
| 791 | { |
| 792 | .func = function_trace_call, |
| 793 | }; |
| 794 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 795 | void tracing_start_function_trace(void) |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 796 | { |
| 797 | register_ftrace_function(&trace_ops); |
| 798 | } |
| 799 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 800 | void tracing_stop_function_trace(void) |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 801 | { |
| 802 | unregister_ftrace_function(&trace_ops); |
| 803 | } |
| 804 | #endif |
| 805 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 806 | enum trace_file_type { |
| 807 | TRACE_FILE_LAT_FMT = 1, |
| 808 | }; |
| 809 | |
| 810 | static struct trace_entry * |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 811 | trace_entry_idx(struct trace_array *tr, struct trace_array_cpu *data, |
| 812 | struct trace_iterator *iter, int cpu) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 813 | { |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 814 | struct page *page; |
| 815 | struct trace_entry *array; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 816 | |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 817 | if (iter->next_idx[cpu] >= tr->entries || |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 818 | iter->next_idx[cpu] >= data->trace_idx || |
| 819 | (data->trace_head == data->trace_tail && |
| 820 | data->trace_head_idx == data->trace_tail_idx)) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 821 | return NULL; |
| 822 | |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 823 | if (!iter->next_page[cpu]) { |
Steven Rostedt | 93a588f | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 824 | /* Initialize the iterator for this cpu trace buffer */ |
| 825 | WARN_ON(!data->trace_tail); |
| 826 | page = virt_to_page(data->trace_tail); |
| 827 | iter->next_page[cpu] = &page->lru; |
| 828 | iter->next_page_idx[cpu] = data->trace_tail_idx; |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 829 | } |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 830 | |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 831 | page = list_entry(iter->next_page[cpu], struct page, lru); |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 832 | BUG_ON(&data->trace_pages == &page->lru); |
| 833 | |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 834 | array = page_address(page); |
| 835 | |
Steven Rostedt | 93a588f | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 836 | WARN_ON(iter->next_page_idx[cpu] >= ENTRIES_PER_PAGE); |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 837 | return &array[iter->next_page_idx[cpu]]; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 838 | } |
| 839 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 840 | static struct trace_entry * |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 841 | find_next_entry(struct trace_iterator *iter, int *ent_cpu) |
| 842 | { |
| 843 | struct trace_array *tr = iter->tr; |
| 844 | struct trace_entry *ent, *next = NULL; |
| 845 | int next_cpu = -1; |
| 846 | int cpu; |
| 847 | |
| 848 | for_each_possible_cpu(cpu) { |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 849 | if (!head_page(tr->data[cpu])) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 850 | continue; |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 851 | ent = trace_entry_idx(tr, tr->data[cpu], iter, cpu); |
Ingo Molnar | cdd31cd | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 852 | /* |
| 853 | * Pick the entry with the smallest timestamp: |
| 854 | */ |
| 855 | if (ent && (!next || ent->t < next->t)) { |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 856 | next = ent; |
| 857 | next_cpu = cpu; |
| 858 | } |
| 859 | } |
| 860 | |
| 861 | if (ent_cpu) |
| 862 | *ent_cpu = next_cpu; |
| 863 | |
| 864 | return next; |
| 865 | } |
| 866 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 867 | static void trace_iterator_increment(struct trace_iterator *iter) |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 868 | { |
| 869 | iter->idx++; |
| 870 | iter->next_idx[iter->cpu]++; |
| 871 | iter->next_page_idx[iter->cpu]++; |
Ingo Molnar | 8c523a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 872 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 873 | if (iter->next_page_idx[iter->cpu] >= ENTRIES_PER_PAGE) { |
| 874 | struct trace_array_cpu *data = iter->tr->data[iter->cpu]; |
| 875 | |
| 876 | iter->next_page_idx[iter->cpu] = 0; |
| 877 | iter->next_page[iter->cpu] = |
| 878 | trace_next_list(data, iter->next_page[iter->cpu]); |
| 879 | } |
| 880 | } |
| 881 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 882 | static void trace_consume(struct trace_iterator *iter) |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 883 | { |
| 884 | struct trace_array_cpu *data = iter->tr->data[iter->cpu]; |
| 885 | |
| 886 | data->trace_tail_idx++; |
| 887 | if (data->trace_tail_idx >= ENTRIES_PER_PAGE) { |
| 888 | data->trace_tail = trace_next_page(data, data->trace_tail); |
| 889 | data->trace_tail_idx = 0; |
| 890 | } |
| 891 | |
| 892 | /* Check if we empty it, then reset the index */ |
| 893 | if (data->trace_head == data->trace_tail && |
| 894 | data->trace_head_idx == data->trace_tail_idx) |
| 895 | data->trace_idx = 0; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 896 | } |
| 897 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 898 | static void *find_next_entry_inc(struct trace_iterator *iter) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 899 | { |
| 900 | struct trace_entry *next; |
| 901 | int next_cpu = -1; |
| 902 | |
| 903 | next = find_next_entry(iter, &next_cpu); |
| 904 | |
Ingo Molnar | 4e3c333 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 905 | iter->prev_ent = iter->ent; |
| 906 | iter->prev_cpu = iter->cpu; |
| 907 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 908 | iter->ent = next; |
| 909 | iter->cpu = next_cpu; |
| 910 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 911 | if (next) |
| 912 | trace_iterator_increment(iter); |
| 913 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 914 | return next ? iter : NULL; |
| 915 | } |
| 916 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 917 | 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] | 918 | { |
| 919 | struct trace_iterator *iter = m->private; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 920 | void *last_ent = iter->ent; |
| 921 | int i = (int)*pos; |
Ingo Molnar | 4e3c333 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 922 | void *ent; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 923 | |
| 924 | (*pos)++; |
| 925 | |
| 926 | /* can't go backwards */ |
| 927 | if (iter->idx > i) |
| 928 | return NULL; |
| 929 | |
| 930 | if (iter->idx < 0) |
| 931 | ent = find_next_entry_inc(iter); |
| 932 | else |
| 933 | ent = iter; |
| 934 | |
| 935 | while (ent && iter->idx < i) |
| 936 | ent = find_next_entry_inc(iter); |
| 937 | |
| 938 | iter->pos = *pos; |
| 939 | |
| 940 | if (last_ent && !ent) |
| 941 | seq_puts(m, "\n\nvim:ft=help\n"); |
| 942 | |
| 943 | return ent; |
| 944 | } |
| 945 | |
| 946 | static void *s_start(struct seq_file *m, loff_t *pos) |
| 947 | { |
| 948 | struct trace_iterator *iter = m->private; |
| 949 | void *p = NULL; |
| 950 | loff_t l = 0; |
| 951 | int i; |
| 952 | |
| 953 | mutex_lock(&trace_types_lock); |
| 954 | |
Steven Rostedt | d15f57f | 2008-05-12 21:20:56 +0200 | [diff] [blame] | 955 | if (!current_trace || current_trace != iter->trace) { |
| 956 | mutex_unlock(&trace_types_lock); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 957 | return NULL; |
Steven Rostedt | d15f57f | 2008-05-12 21:20:56 +0200 | [diff] [blame] | 958 | } |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 959 | |
| 960 | atomic_inc(&trace_record_cmdline_disabled); |
| 961 | |
| 962 | /* let the tracer grab locks here if needed */ |
| 963 | if (current_trace->start) |
| 964 | current_trace->start(iter); |
| 965 | |
| 966 | if (*pos != iter->pos) { |
| 967 | iter->ent = NULL; |
| 968 | iter->cpu = 0; |
| 969 | iter->idx = -1; |
Ingo Molnar | 4e3c333 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 970 | iter->prev_ent = NULL; |
| 971 | iter->prev_cpu = -1; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 972 | |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 973 | for_each_possible_cpu(i) { |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 974 | iter->next_idx[i] = 0; |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 975 | iter->next_page[i] = NULL; |
| 976 | } |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 977 | |
| 978 | for (p = iter; p && l < *pos; p = s_next(m, p, &l)) |
| 979 | ; |
| 980 | |
| 981 | } else { |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 982 | l = *pos - 1; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 983 | p = s_next(m, p, &l); |
| 984 | } |
| 985 | |
| 986 | return p; |
| 987 | } |
| 988 | |
| 989 | static void s_stop(struct seq_file *m, void *p) |
| 990 | { |
| 991 | struct trace_iterator *iter = m->private; |
| 992 | |
| 993 | atomic_dec(&trace_record_cmdline_disabled); |
| 994 | |
| 995 | /* let the tracer release locks here if needed */ |
| 996 | if (current_trace && current_trace == iter->trace && iter->trace->stop) |
| 997 | iter->trace->stop(iter); |
| 998 | |
| 999 | mutex_unlock(&trace_types_lock); |
| 1000 | } |
| 1001 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1002 | static int |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1003 | 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] | 1004 | { |
| 1005 | #ifdef CONFIG_KALLSYMS |
| 1006 | char str[KSYM_SYMBOL_LEN]; |
| 1007 | |
| 1008 | kallsyms_lookup(address, NULL, NULL, NULL, str); |
| 1009 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1010 | return trace_seq_printf(s, fmt, str); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1011 | #endif |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1012 | return 1; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1013 | } |
| 1014 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1015 | static int |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1016 | seq_print_sym_offset(struct trace_seq *s, const char *fmt, |
| 1017 | unsigned long address) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1018 | { |
| 1019 | #ifdef CONFIG_KALLSYMS |
| 1020 | char str[KSYM_SYMBOL_LEN]; |
| 1021 | |
| 1022 | sprint_symbol(str, address); |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1023 | return trace_seq_printf(s, fmt, str); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1024 | #endif |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1025 | return 1; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1026 | } |
| 1027 | |
| 1028 | #ifndef CONFIG_64BIT |
| 1029 | # define IP_FMT "%08lx" |
| 1030 | #else |
| 1031 | # define IP_FMT "%016lx" |
| 1032 | #endif |
| 1033 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1034 | static int |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1035 | 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] | 1036 | { |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1037 | int ret; |
| 1038 | |
| 1039 | if (!ip) |
| 1040 | return trace_seq_printf(s, "0"); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1041 | |
| 1042 | if (sym_flags & TRACE_ITER_SYM_OFFSET) |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1043 | ret = seq_print_sym_offset(s, "%s", ip); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1044 | else |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1045 | ret = seq_print_sym_short(s, "%s", ip); |
| 1046 | |
| 1047 | if (!ret) |
| 1048 | return 0; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1049 | |
| 1050 | if (sym_flags & TRACE_ITER_SYM_ADDR) |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1051 | ret = trace_seq_printf(s, " <" IP_FMT ">", ip); |
| 1052 | return ret; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1053 | } |
| 1054 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1055 | static void print_lat_help_header(struct seq_file *m) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1056 | { |
| 1057 | seq_puts(m, "# _------=> CPU# \n"); |
| 1058 | seq_puts(m, "# / _-----=> irqs-off \n"); |
| 1059 | seq_puts(m, "# | / _----=> need-resched \n"); |
| 1060 | seq_puts(m, "# || / _---=> hardirq/softirq \n"); |
| 1061 | seq_puts(m, "# ||| / _--=> preempt-depth \n"); |
| 1062 | seq_puts(m, "# |||| / \n"); |
| 1063 | seq_puts(m, "# ||||| delay \n"); |
| 1064 | seq_puts(m, "# cmd pid ||||| time | caller \n"); |
| 1065 | seq_puts(m, "# \\ / ||||| \\ | / \n"); |
| 1066 | } |
| 1067 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1068 | static void print_func_help_header(struct seq_file *m) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1069 | { |
| 1070 | seq_puts(m, "# TASK-PID CPU# TIMESTAMP FUNCTION\n"); |
| 1071 | seq_puts(m, "# | | | | |\n"); |
| 1072 | } |
| 1073 | |
| 1074 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1075 | static void |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1076 | print_trace_header(struct seq_file *m, struct trace_iterator *iter) |
| 1077 | { |
| 1078 | unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK); |
| 1079 | struct trace_array *tr = iter->tr; |
| 1080 | struct trace_array_cpu *data = tr->data[tr->cpu]; |
| 1081 | struct tracer *type = current_trace; |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1082 | unsigned long total = 0; |
| 1083 | unsigned long entries = 0; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1084 | int cpu; |
| 1085 | const char *name = "preemption"; |
| 1086 | |
| 1087 | if (type) |
| 1088 | name = type->name; |
| 1089 | |
| 1090 | for_each_possible_cpu(cpu) { |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 1091 | if (head_page(tr->data[cpu])) { |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1092 | total += tr->data[cpu]->trace_idx; |
| 1093 | if (tr->data[cpu]->trace_idx > tr->entries) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1094 | entries += tr->entries; |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1095 | else |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1096 | entries += tr->data[cpu]->trace_idx; |
| 1097 | } |
| 1098 | } |
| 1099 | |
| 1100 | seq_printf(m, "%s latency trace v1.1.5 on %s\n", |
| 1101 | name, UTS_RELEASE); |
| 1102 | seq_puts(m, "-----------------------------------" |
| 1103 | "---------------------------------\n"); |
| 1104 | seq_printf(m, " latency: %lu us, #%lu/%lu, CPU#%d |" |
| 1105 | " (M:%s VP:%d, KP:%d, SP:%d HP:%d", |
Steven Rostedt | 57f50be | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 1106 | nsecs_to_usecs(data->saved_latency), |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1107 | entries, |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1108 | total, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1109 | tr->cpu, |
| 1110 | #if defined(CONFIG_PREEMPT_NONE) |
| 1111 | "server", |
| 1112 | #elif defined(CONFIG_PREEMPT_VOLUNTARY) |
| 1113 | "desktop", |
| 1114 | #elif defined(CONFIG_PREEMPT_DESKTOP) |
| 1115 | "preempt", |
| 1116 | #else |
| 1117 | "unknown", |
| 1118 | #endif |
| 1119 | /* These are reserved for later use */ |
| 1120 | 0, 0, 0, 0); |
| 1121 | #ifdef CONFIG_SMP |
| 1122 | seq_printf(m, " #P:%d)\n", num_online_cpus()); |
| 1123 | #else |
| 1124 | seq_puts(m, ")\n"); |
| 1125 | #endif |
| 1126 | seq_puts(m, " -----------------\n"); |
| 1127 | seq_printf(m, " | task: %.16s-%d " |
| 1128 | "(uid:%d nice:%ld policy:%ld rt_prio:%ld)\n", |
| 1129 | data->comm, data->pid, data->uid, data->nice, |
| 1130 | data->policy, data->rt_priority); |
| 1131 | seq_puts(m, " -----------------\n"); |
| 1132 | |
| 1133 | if (data->critical_start) { |
| 1134 | seq_puts(m, " => started at: "); |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1135 | seq_print_ip_sym(&iter->seq, data->critical_start, sym_flags); |
| 1136 | trace_print_seq(m, &iter->seq); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1137 | seq_puts(m, "\n => ended at: "); |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1138 | seq_print_ip_sym(&iter->seq, data->critical_end, sym_flags); |
| 1139 | trace_print_seq(m, &iter->seq); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1140 | seq_puts(m, "\n"); |
| 1141 | } |
| 1142 | |
| 1143 | seq_puts(m, "\n"); |
| 1144 | } |
| 1145 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1146 | static void |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1147 | 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] | 1148 | { |
| 1149 | int hardirq, softirq; |
| 1150 | char *comm; |
| 1151 | |
| 1152 | comm = trace_find_cmdline(entry->pid); |
| 1153 | |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1154 | trace_seq_printf(s, "%8.8s-%-5d ", comm, entry->pid); |
| 1155 | trace_seq_printf(s, "%d", cpu); |
| 1156 | trace_seq_printf(s, "%c%c", |
| 1157 | (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' : '.', |
| 1158 | ((entry->flags & TRACE_FLAG_NEED_RESCHED) ? 'N' : '.')); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1159 | |
| 1160 | hardirq = entry->flags & TRACE_FLAG_HARDIRQ; |
| 1161 | softirq = entry->flags & TRACE_FLAG_SOFTIRQ; |
| 1162 | if (hardirq && softirq) |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1163 | trace_seq_putc(s, 'H'); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1164 | else { |
| 1165 | if (hardirq) |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1166 | trace_seq_putc(s, 'h'); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1167 | else { |
| 1168 | if (softirq) |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1169 | trace_seq_putc(s, 's'); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1170 | else |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1171 | trace_seq_putc(s, '.'); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1172 | } |
| 1173 | } |
| 1174 | |
| 1175 | if (entry->preempt_count) |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1176 | trace_seq_printf(s, "%x", entry->preempt_count); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1177 | else |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1178 | trace_seq_puts(s, "."); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1179 | } |
| 1180 | |
| 1181 | unsigned long preempt_mark_thresh = 100; |
| 1182 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1183 | static void |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1184 | lat_print_timestamp(struct trace_seq *s, unsigned long long abs_usecs, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1185 | unsigned long rel_usecs) |
| 1186 | { |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1187 | trace_seq_printf(s, " %4lldus", abs_usecs); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1188 | if (rel_usecs > preempt_mark_thresh) |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1189 | trace_seq_puts(s, "!: "); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1190 | else if (rel_usecs > 1) |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1191 | trace_seq_puts(s, "+: "); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1192 | else |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1193 | trace_seq_puts(s, " : "); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1194 | } |
| 1195 | |
| 1196 | static const char state_to_char[] = TASK_STATE_TO_CHAR_STR; |
| 1197 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1198 | static int |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1199 | 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] | 1200 | { |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1201 | struct trace_seq *s = &iter->seq; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1202 | unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK); |
| 1203 | struct trace_entry *next_entry = find_next_entry(iter, NULL); |
| 1204 | unsigned long verbose = (trace_flags & TRACE_ITER_VERBOSE); |
| 1205 | struct trace_entry *entry = iter->ent; |
| 1206 | unsigned long abs_usecs; |
| 1207 | unsigned long rel_usecs; |
| 1208 | char *comm; |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1209 | int S, T; |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1210 | int i; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1211 | |
| 1212 | if (!next_entry) |
| 1213 | next_entry = entry; |
| 1214 | rel_usecs = ns2usecs(next_entry->t - entry->t); |
| 1215 | abs_usecs = ns2usecs(entry->t - iter->tr->time_start); |
| 1216 | |
| 1217 | if (verbose) { |
| 1218 | comm = trace_find_cmdline(entry->pid); |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1219 | trace_seq_printf(s, "%16s %5d %d %d %08x %08x [%08lx]" |
| 1220 | " %ld.%03ldms (+%ld.%03ldms): ", |
| 1221 | comm, |
| 1222 | entry->pid, cpu, entry->flags, |
| 1223 | entry->preempt_count, trace_idx, |
| 1224 | ns2usecs(entry->t), |
| 1225 | abs_usecs/1000, |
| 1226 | abs_usecs % 1000, rel_usecs/1000, |
| 1227 | rel_usecs % 1000); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1228 | } else { |
Ingo Molnar | f29c73f | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1229 | lat_print_generic(s, entry, cpu); |
| 1230 | lat_print_timestamp(s, abs_usecs, rel_usecs); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1231 | } |
| 1232 | switch (entry->type) { |
| 1233 | case TRACE_FN: |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1234 | seq_print_ip_sym(s, entry->fn.ip, sym_flags); |
| 1235 | trace_seq_puts(s, " ("); |
| 1236 | seq_print_ip_sym(s, entry->fn.parent_ip, sym_flags); |
| 1237 | trace_seq_puts(s, ")\n"); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1238 | break; |
| 1239 | case TRACE_CTX: |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1240 | case TRACE_WAKE: |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1241 | S = entry->ctx.prev_state < sizeof(state_to_char) ? |
| 1242 | state_to_char[entry->ctx.prev_state] : 'X'; |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1243 | T = entry->ctx.next_state < sizeof(state_to_char) ? |
| 1244 | state_to_char[entry->ctx.next_state] : 'X'; |
| 1245 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1246 | comm = trace_find_cmdline(entry->ctx.next_pid); |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1247 | 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] | 1248 | entry->ctx.prev_pid, |
| 1249 | entry->ctx.prev_prio, |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1250 | S, entry->type == TRACE_CTX ? "==>" : " +", |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1251 | entry->ctx.next_pid, |
| 1252 | entry->ctx.next_prio, |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1253 | T, comm); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1254 | break; |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1255 | case TRACE_SPECIAL: |
Ingo Molnar | 88a4216 | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1256 | trace_seq_printf(s, "# %ld %ld %ld\n", |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1257 | entry->special.arg1, |
| 1258 | entry->special.arg2, |
| 1259 | entry->special.arg3); |
| 1260 | break; |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1261 | case TRACE_STACK: |
| 1262 | for (i = 0; i < FTRACE_STACK_ENTRIES; i++) { |
| 1263 | if (i) |
| 1264 | trace_seq_puts(s, " <= "); |
| 1265 | seq_print_ip_sym(s, entry->stack.caller[i], sym_flags); |
| 1266 | } |
| 1267 | trace_seq_puts(s, "\n"); |
| 1268 | break; |
Steven Rostedt | 89b2f97 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 1269 | default: |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1270 | trace_seq_printf(s, "Unknown type %d\n", entry->type); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1271 | } |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1272 | return 1; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1273 | } |
| 1274 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1275 | static int print_trace_fmt(struct trace_iterator *iter) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1276 | { |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1277 | struct trace_seq *s = &iter->seq; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1278 | unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK); |
Ingo Molnar | 4e3c333 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 1279 | struct trace_entry *entry; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1280 | unsigned long usec_rem; |
| 1281 | unsigned long long t; |
| 1282 | unsigned long secs; |
| 1283 | char *comm; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1284 | int ret; |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1285 | int S, T; |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1286 | int i; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1287 | |
Ingo Molnar | 4e3c333 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 1288 | entry = iter->ent; |
| 1289 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1290 | comm = trace_find_cmdline(iter->ent->pid); |
| 1291 | |
Ingo Molnar | cdd31cd | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1292 | t = ns2usecs(entry->t); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1293 | usec_rem = do_div(t, 1000000ULL); |
| 1294 | secs = (unsigned long)t; |
| 1295 | |
Ingo Molnar | f29c73f | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1296 | ret = trace_seq_printf(s, "%16s-%-5d ", comm, entry->pid); |
| 1297 | if (!ret) |
| 1298 | return 0; |
| 1299 | ret = trace_seq_printf(s, "[%02d] ", iter->cpu); |
| 1300 | if (!ret) |
| 1301 | return 0; |
| 1302 | ret = trace_seq_printf(s, "%5lu.%06lu: ", secs, usec_rem); |
| 1303 | if (!ret) |
| 1304 | return 0; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1305 | |
| 1306 | switch (entry->type) { |
| 1307 | case TRACE_FN: |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1308 | ret = seq_print_ip_sym(s, entry->fn.ip, sym_flags); |
| 1309 | if (!ret) |
| 1310 | return 0; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1311 | if ((sym_flags & TRACE_ITER_PRINT_PARENT) && |
| 1312 | entry->fn.parent_ip) { |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1313 | ret = trace_seq_printf(s, " <-"); |
| 1314 | if (!ret) |
| 1315 | return 0; |
| 1316 | ret = seq_print_ip_sym(s, entry->fn.parent_ip, |
| 1317 | sym_flags); |
| 1318 | if (!ret) |
| 1319 | return 0; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1320 | } |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1321 | ret = trace_seq_printf(s, "\n"); |
| 1322 | if (!ret) |
| 1323 | return 0; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1324 | break; |
| 1325 | case TRACE_CTX: |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1326 | case TRACE_WAKE: |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1327 | S = entry->ctx.prev_state < sizeof(state_to_char) ? |
| 1328 | state_to_char[entry->ctx.prev_state] : 'X'; |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1329 | T = entry->ctx.next_state < sizeof(state_to_char) ? |
| 1330 | state_to_char[entry->ctx.next_state] : 'X'; |
| 1331 | 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] | 1332 | entry->ctx.prev_pid, |
| 1333 | entry->ctx.prev_prio, |
| 1334 | S, |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1335 | entry->type == TRACE_CTX ? "==>" : " +", |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1336 | entry->ctx.next_pid, |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1337 | entry->ctx.next_prio, |
| 1338 | T); |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1339 | if (!ret) |
| 1340 | return 0; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1341 | break; |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1342 | case TRACE_SPECIAL: |
Ingo Molnar | 88a4216 | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1343 | ret = trace_seq_printf(s, "# %ld %ld %ld\n", |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1344 | entry->special.arg1, |
| 1345 | entry->special.arg2, |
| 1346 | entry->special.arg3); |
| 1347 | if (!ret) |
| 1348 | return 0; |
| 1349 | break; |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1350 | case TRACE_STACK: |
| 1351 | for (i = 0; i < FTRACE_STACK_ENTRIES; i++) { |
| 1352 | if (i) { |
| 1353 | ret = trace_seq_puts(s, " <= "); |
| 1354 | if (!ret) |
| 1355 | return 0; |
| 1356 | } |
| 1357 | ret = seq_print_ip_sym(s, entry->stack.caller[i], |
| 1358 | sym_flags); |
| 1359 | if (!ret) |
| 1360 | return 0; |
| 1361 | } |
| 1362 | ret = trace_seq_puts(s, "\n"); |
| 1363 | if (!ret) |
| 1364 | return 0; |
| 1365 | break; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1366 | } |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1367 | return 1; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1368 | } |
| 1369 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1370 | static int print_raw_fmt(struct trace_iterator *iter) |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1371 | { |
| 1372 | struct trace_seq *s = &iter->seq; |
| 1373 | struct trace_entry *entry; |
| 1374 | int ret; |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1375 | int S, T; |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1376 | |
| 1377 | entry = iter->ent; |
| 1378 | |
| 1379 | ret = trace_seq_printf(s, "%d %d %llu ", |
| 1380 | entry->pid, iter->cpu, entry->t); |
| 1381 | if (!ret) |
| 1382 | return 0; |
| 1383 | |
| 1384 | switch (entry->type) { |
| 1385 | case TRACE_FN: |
| 1386 | ret = trace_seq_printf(s, "%x %x\n", |
| 1387 | entry->fn.ip, entry->fn.parent_ip); |
| 1388 | if (!ret) |
| 1389 | return 0; |
| 1390 | break; |
| 1391 | case TRACE_CTX: |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1392 | case TRACE_WAKE: |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1393 | S = entry->ctx.prev_state < sizeof(state_to_char) ? |
| 1394 | state_to_char[entry->ctx.prev_state] : 'X'; |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1395 | T = entry->ctx.next_state < sizeof(state_to_char) ? |
| 1396 | state_to_char[entry->ctx.next_state] : 'X'; |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1397 | if (entry->type == TRACE_WAKE) |
| 1398 | S = '+'; |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1399 | ret = trace_seq_printf(s, "%d %d %c %d %d %c\n", |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1400 | entry->ctx.prev_pid, |
| 1401 | entry->ctx.prev_prio, |
| 1402 | S, |
| 1403 | entry->ctx.next_pid, |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1404 | entry->ctx.next_prio, |
| 1405 | T); |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1406 | if (!ret) |
| 1407 | return 0; |
| 1408 | break; |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1409 | case TRACE_SPECIAL: |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1410 | case TRACE_STACK: |
Ingo Molnar | 88a4216 | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1411 | ret = trace_seq_printf(s, "# %ld %ld %ld\n", |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1412 | entry->special.arg1, |
| 1413 | entry->special.arg2, |
| 1414 | entry->special.arg3); |
| 1415 | if (!ret) |
| 1416 | return 0; |
| 1417 | break; |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1418 | } |
| 1419 | return 1; |
| 1420 | } |
| 1421 | |
Ingo Molnar | cb0f12a | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1422 | #define SEQ_PUT_FIELD_RET(s, x) \ |
| 1423 | do { \ |
| 1424 | if (!trace_seq_putmem(s, &(x), sizeof(x))) \ |
| 1425 | return 0; \ |
| 1426 | } while (0) |
| 1427 | |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1428 | #define SEQ_PUT_HEX_FIELD_RET(s, x) \ |
| 1429 | do { \ |
| 1430 | if (!trace_seq_putmem_hex(s, &(x), sizeof(x))) \ |
| 1431 | return 0; \ |
| 1432 | } while (0) |
| 1433 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1434 | static int print_hex_fmt(struct trace_iterator *iter) |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1435 | { |
| 1436 | struct trace_seq *s = &iter->seq; |
| 1437 | unsigned char newline = '\n'; |
| 1438 | struct trace_entry *entry; |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1439 | int S, T; |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1440 | |
| 1441 | entry = iter->ent; |
| 1442 | |
| 1443 | SEQ_PUT_HEX_FIELD_RET(s, entry->pid); |
| 1444 | SEQ_PUT_HEX_FIELD_RET(s, iter->cpu); |
| 1445 | SEQ_PUT_HEX_FIELD_RET(s, entry->t); |
| 1446 | |
| 1447 | switch (entry->type) { |
| 1448 | case TRACE_FN: |
| 1449 | SEQ_PUT_HEX_FIELD_RET(s, entry->fn.ip); |
| 1450 | SEQ_PUT_HEX_FIELD_RET(s, entry->fn.parent_ip); |
| 1451 | break; |
| 1452 | case TRACE_CTX: |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1453 | case TRACE_WAKE: |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1454 | S = entry->ctx.prev_state < sizeof(state_to_char) ? |
| 1455 | state_to_char[entry->ctx.prev_state] : 'X'; |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1456 | T = entry->ctx.next_state < sizeof(state_to_char) ? |
| 1457 | state_to_char[entry->ctx.next_state] : 'X'; |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1458 | if (entry->type == TRACE_WAKE) |
| 1459 | S = '+'; |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1460 | SEQ_PUT_HEX_FIELD_RET(s, entry->ctx.prev_pid); |
| 1461 | SEQ_PUT_HEX_FIELD_RET(s, entry->ctx.prev_prio); |
| 1462 | SEQ_PUT_HEX_FIELD_RET(s, S); |
| 1463 | SEQ_PUT_HEX_FIELD_RET(s, entry->ctx.next_pid); |
| 1464 | SEQ_PUT_HEX_FIELD_RET(s, entry->ctx.next_prio); |
| 1465 | SEQ_PUT_HEX_FIELD_RET(s, entry->fn.parent_ip); |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1466 | SEQ_PUT_HEX_FIELD_RET(s, T); |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1467 | break; |
| 1468 | case TRACE_SPECIAL: |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1469 | case TRACE_STACK: |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1470 | SEQ_PUT_HEX_FIELD_RET(s, entry->special.arg1); |
| 1471 | SEQ_PUT_HEX_FIELD_RET(s, entry->special.arg2); |
| 1472 | SEQ_PUT_HEX_FIELD_RET(s, entry->special.arg3); |
| 1473 | break; |
| 1474 | } |
| 1475 | SEQ_PUT_FIELD_RET(s, newline); |
| 1476 | |
| 1477 | return 1; |
| 1478 | } |
| 1479 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1480 | static int print_bin_fmt(struct trace_iterator *iter) |
Ingo Molnar | cb0f12a | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1481 | { |
| 1482 | struct trace_seq *s = &iter->seq; |
| 1483 | struct trace_entry *entry; |
| 1484 | |
| 1485 | entry = iter->ent; |
| 1486 | |
| 1487 | SEQ_PUT_FIELD_RET(s, entry->pid); |
| 1488 | SEQ_PUT_FIELD_RET(s, entry->cpu); |
| 1489 | SEQ_PUT_FIELD_RET(s, entry->t); |
| 1490 | |
| 1491 | switch (entry->type) { |
| 1492 | case TRACE_FN: |
| 1493 | SEQ_PUT_FIELD_RET(s, entry->fn.ip); |
| 1494 | SEQ_PUT_FIELD_RET(s, entry->fn.parent_ip); |
| 1495 | break; |
| 1496 | case TRACE_CTX: |
| 1497 | SEQ_PUT_FIELD_RET(s, entry->ctx.prev_pid); |
| 1498 | SEQ_PUT_FIELD_RET(s, entry->ctx.prev_prio); |
| 1499 | SEQ_PUT_FIELD_RET(s, entry->ctx.prev_state); |
| 1500 | SEQ_PUT_FIELD_RET(s, entry->ctx.next_pid); |
| 1501 | SEQ_PUT_FIELD_RET(s, entry->ctx.next_prio); |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1502 | SEQ_PUT_FIELD_RET(s, entry->ctx.next_state); |
Ingo Molnar | cb0f12a | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1503 | break; |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1504 | case TRACE_SPECIAL: |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1505 | case TRACE_STACK: |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1506 | SEQ_PUT_FIELD_RET(s, entry->special.arg1); |
| 1507 | SEQ_PUT_FIELD_RET(s, entry->special.arg2); |
| 1508 | SEQ_PUT_FIELD_RET(s, entry->special.arg3); |
| 1509 | break; |
Ingo Molnar | cb0f12a | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1510 | } |
| 1511 | return 1; |
| 1512 | } |
| 1513 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1514 | static int trace_empty(struct trace_iterator *iter) |
| 1515 | { |
| 1516 | struct trace_array_cpu *data; |
| 1517 | int cpu; |
| 1518 | |
| 1519 | for_each_possible_cpu(cpu) { |
| 1520 | data = iter->tr->data[cpu]; |
| 1521 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1522 | if (head_page(data) && data->trace_idx && |
| 1523 | (data->trace_tail != data->trace_head || |
| 1524 | data->trace_tail_idx != data->trace_head_idx)) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1525 | return 0; |
| 1526 | } |
| 1527 | return 1; |
| 1528 | } |
| 1529 | |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1530 | static int print_trace_line(struct trace_iterator *iter) |
| 1531 | { |
Thomas Gleixner | 72829bc | 2008-05-23 21:37:28 +0200 | [diff] [blame^] | 1532 | if (iter->trace && iter->trace->print_line) |
| 1533 | return iter->trace->print_line(iter); |
| 1534 | |
Ingo Molnar | cb0f12a | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1535 | if (trace_flags & TRACE_ITER_BIN) |
| 1536 | return print_bin_fmt(iter); |
| 1537 | |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1538 | if (trace_flags & TRACE_ITER_HEX) |
| 1539 | return print_hex_fmt(iter); |
| 1540 | |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1541 | if (trace_flags & TRACE_ITER_RAW) |
| 1542 | return print_raw_fmt(iter); |
| 1543 | |
| 1544 | if (iter->iter_flags & TRACE_FILE_LAT_FMT) |
| 1545 | return print_lat_fmt(iter, iter->idx, iter->cpu); |
| 1546 | |
| 1547 | return print_trace_fmt(iter); |
| 1548 | } |
| 1549 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1550 | static int s_show(struct seq_file *m, void *v) |
| 1551 | { |
| 1552 | struct trace_iterator *iter = v; |
| 1553 | |
| 1554 | if (iter->ent == NULL) { |
| 1555 | if (iter->tr) { |
| 1556 | seq_printf(m, "# tracer: %s\n", iter->trace->name); |
| 1557 | seq_puts(m, "#\n"); |
| 1558 | } |
| 1559 | if (iter->iter_flags & TRACE_FILE_LAT_FMT) { |
| 1560 | /* print nothing if the buffers are empty */ |
| 1561 | if (trace_empty(iter)) |
| 1562 | return 0; |
| 1563 | print_trace_header(m, iter); |
| 1564 | if (!(trace_flags & TRACE_ITER_VERBOSE)) |
| 1565 | print_lat_help_header(m); |
| 1566 | } else { |
| 1567 | if (!(trace_flags & TRACE_ITER_VERBOSE)) |
| 1568 | print_func_help_header(m); |
| 1569 | } |
| 1570 | } else { |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1571 | print_trace_line(iter); |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1572 | trace_print_seq(m, &iter->seq); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1573 | } |
| 1574 | |
| 1575 | return 0; |
| 1576 | } |
| 1577 | |
| 1578 | static struct seq_operations tracer_seq_ops = { |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1579 | .start = s_start, |
| 1580 | .next = s_next, |
| 1581 | .stop = s_stop, |
| 1582 | .show = s_show, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1583 | }; |
| 1584 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1585 | static struct trace_iterator * |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1586 | __tracing_open(struct inode *inode, struct file *file, int *ret) |
| 1587 | { |
| 1588 | struct trace_iterator *iter; |
| 1589 | |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 1590 | if (tracing_disabled) { |
| 1591 | *ret = -ENODEV; |
| 1592 | return NULL; |
| 1593 | } |
| 1594 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1595 | iter = kzalloc(sizeof(*iter), GFP_KERNEL); |
| 1596 | if (!iter) { |
| 1597 | *ret = -ENOMEM; |
| 1598 | goto out; |
| 1599 | } |
| 1600 | |
| 1601 | mutex_lock(&trace_types_lock); |
| 1602 | if (current_trace && current_trace->print_max) |
| 1603 | iter->tr = &max_tr; |
| 1604 | else |
| 1605 | iter->tr = inode->i_private; |
| 1606 | iter->trace = current_trace; |
| 1607 | iter->pos = -1; |
| 1608 | |
| 1609 | /* TODO stop tracer */ |
| 1610 | *ret = seq_open(file, &tracer_seq_ops); |
| 1611 | if (!*ret) { |
| 1612 | struct seq_file *m = file->private_data; |
| 1613 | m->private = iter; |
| 1614 | |
| 1615 | /* stop the trace while dumping */ |
| 1616 | if (iter->tr->ctrl) |
| 1617 | tracer_enabled = 0; |
| 1618 | |
| 1619 | if (iter->trace && iter->trace->open) |
| 1620 | iter->trace->open(iter); |
| 1621 | } else { |
| 1622 | kfree(iter); |
| 1623 | iter = NULL; |
| 1624 | } |
| 1625 | mutex_unlock(&trace_types_lock); |
| 1626 | |
| 1627 | out: |
| 1628 | return iter; |
| 1629 | } |
| 1630 | |
| 1631 | int tracing_open_generic(struct inode *inode, struct file *filp) |
| 1632 | { |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 1633 | if (tracing_disabled) |
| 1634 | return -ENODEV; |
| 1635 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1636 | filp->private_data = inode->i_private; |
| 1637 | return 0; |
| 1638 | } |
| 1639 | |
| 1640 | int tracing_release(struct inode *inode, struct file *file) |
| 1641 | { |
| 1642 | struct seq_file *m = (struct seq_file *)file->private_data; |
| 1643 | struct trace_iterator *iter = m->private; |
| 1644 | |
| 1645 | mutex_lock(&trace_types_lock); |
| 1646 | if (iter->trace && iter->trace->close) |
| 1647 | iter->trace->close(iter); |
| 1648 | |
| 1649 | /* reenable tracing if it was previously enabled */ |
| 1650 | if (iter->tr->ctrl) |
| 1651 | tracer_enabled = 1; |
| 1652 | mutex_unlock(&trace_types_lock); |
| 1653 | |
| 1654 | seq_release(inode, file); |
| 1655 | kfree(iter); |
| 1656 | return 0; |
| 1657 | } |
| 1658 | |
| 1659 | static int tracing_open(struct inode *inode, struct file *file) |
| 1660 | { |
| 1661 | int ret; |
| 1662 | |
| 1663 | __tracing_open(inode, file, &ret); |
| 1664 | |
| 1665 | return ret; |
| 1666 | } |
| 1667 | |
| 1668 | static int tracing_lt_open(struct inode *inode, struct file *file) |
| 1669 | { |
| 1670 | struct trace_iterator *iter; |
| 1671 | int ret; |
| 1672 | |
| 1673 | iter = __tracing_open(inode, file, &ret); |
| 1674 | |
| 1675 | if (!ret) |
| 1676 | iter->iter_flags |= TRACE_FILE_LAT_FMT; |
| 1677 | |
| 1678 | return ret; |
| 1679 | } |
| 1680 | |
| 1681 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1682 | static void * |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1683 | t_next(struct seq_file *m, void *v, loff_t *pos) |
| 1684 | { |
| 1685 | struct tracer *t = m->private; |
| 1686 | |
| 1687 | (*pos)++; |
| 1688 | |
| 1689 | if (t) |
| 1690 | t = t->next; |
| 1691 | |
| 1692 | m->private = t; |
| 1693 | |
| 1694 | return t; |
| 1695 | } |
| 1696 | |
| 1697 | static void *t_start(struct seq_file *m, loff_t *pos) |
| 1698 | { |
| 1699 | struct tracer *t = m->private; |
| 1700 | loff_t l = 0; |
| 1701 | |
| 1702 | mutex_lock(&trace_types_lock); |
| 1703 | for (; t && l < *pos; t = t_next(m, t, &l)) |
| 1704 | ; |
| 1705 | |
| 1706 | return t; |
| 1707 | } |
| 1708 | |
| 1709 | static void t_stop(struct seq_file *m, void *p) |
| 1710 | { |
| 1711 | mutex_unlock(&trace_types_lock); |
| 1712 | } |
| 1713 | |
| 1714 | static int t_show(struct seq_file *m, void *v) |
| 1715 | { |
| 1716 | struct tracer *t = v; |
| 1717 | |
| 1718 | if (!t) |
| 1719 | return 0; |
| 1720 | |
| 1721 | seq_printf(m, "%s", t->name); |
| 1722 | if (t->next) |
| 1723 | seq_putc(m, ' '); |
| 1724 | else |
| 1725 | seq_putc(m, '\n'); |
| 1726 | |
| 1727 | return 0; |
| 1728 | } |
| 1729 | |
| 1730 | static struct seq_operations show_traces_seq_ops = { |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1731 | .start = t_start, |
| 1732 | .next = t_next, |
| 1733 | .stop = t_stop, |
| 1734 | .show = t_show, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1735 | }; |
| 1736 | |
| 1737 | static int show_traces_open(struct inode *inode, struct file *file) |
| 1738 | { |
| 1739 | int ret; |
| 1740 | |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 1741 | if (tracing_disabled) |
| 1742 | return -ENODEV; |
| 1743 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1744 | ret = seq_open(file, &show_traces_seq_ops); |
| 1745 | if (!ret) { |
| 1746 | struct seq_file *m = file->private_data; |
| 1747 | m->private = trace_types; |
| 1748 | } |
| 1749 | |
| 1750 | return ret; |
| 1751 | } |
| 1752 | |
| 1753 | static struct file_operations tracing_fops = { |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1754 | .open = tracing_open, |
| 1755 | .read = seq_read, |
| 1756 | .llseek = seq_lseek, |
| 1757 | .release = tracing_release, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1758 | }; |
| 1759 | |
| 1760 | static struct file_operations tracing_lt_fops = { |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1761 | .open = tracing_lt_open, |
| 1762 | .read = seq_read, |
| 1763 | .llseek = seq_lseek, |
| 1764 | .release = tracing_release, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1765 | }; |
| 1766 | |
| 1767 | static struct file_operations show_traces_fops = { |
Ingo Molnar | c7078de | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 1768 | .open = show_traces_open, |
| 1769 | .read = seq_read, |
| 1770 | .release = seq_release, |
| 1771 | }; |
| 1772 | |
Ingo Molnar | 36dfe92 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 1773 | /* |
| 1774 | * Only trace on a CPU if the bitmask is set: |
| 1775 | */ |
| 1776 | static cpumask_t tracing_cpumask = CPU_MASK_ALL; |
| 1777 | |
| 1778 | /* |
| 1779 | * When tracing/tracing_cpu_mask is modified then this holds |
| 1780 | * the new bitmask we are about to install: |
| 1781 | */ |
| 1782 | static cpumask_t tracing_cpumask_new; |
| 1783 | |
| 1784 | /* |
| 1785 | * The tracer itself will not take this lock, but still we want |
| 1786 | * to provide a consistent cpumask to user-space: |
| 1787 | */ |
| 1788 | static DEFINE_MUTEX(tracing_cpumask_update_lock); |
| 1789 | |
| 1790 | /* |
| 1791 | * Temporary storage for the character representation of the |
| 1792 | * CPU bitmask (and one more byte for the newline): |
| 1793 | */ |
| 1794 | static char mask_str[NR_CPUS + 1]; |
| 1795 | |
Ingo Molnar | c7078de | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 1796 | static ssize_t |
| 1797 | tracing_cpumask_read(struct file *filp, char __user *ubuf, |
| 1798 | size_t count, loff_t *ppos) |
| 1799 | { |
Ingo Molnar | 36dfe92 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 1800 | int len; |
Ingo Molnar | c7078de | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 1801 | |
| 1802 | mutex_lock(&tracing_cpumask_update_lock); |
Ingo Molnar | 36dfe92 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 1803 | |
| 1804 | len = cpumask_scnprintf(mask_str, count, tracing_cpumask); |
| 1805 | if (count - len < 2) { |
| 1806 | count = -EINVAL; |
| 1807 | goto out_err; |
| 1808 | } |
| 1809 | len += sprintf(mask_str + len, "\n"); |
| 1810 | count = simple_read_from_buffer(ubuf, count, ppos, mask_str, NR_CPUS+1); |
| 1811 | |
| 1812 | out_err: |
Ingo Molnar | c7078de | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 1813 | mutex_unlock(&tracing_cpumask_update_lock); |
| 1814 | |
| 1815 | return count; |
| 1816 | } |
| 1817 | |
| 1818 | static ssize_t |
| 1819 | tracing_cpumask_write(struct file *filp, const char __user *ubuf, |
| 1820 | size_t count, loff_t *ppos) |
| 1821 | { |
Ingo Molnar | 36dfe92 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 1822 | int err, cpu; |
Ingo Molnar | c7078de | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 1823 | |
| 1824 | mutex_lock(&tracing_cpumask_update_lock); |
Ingo Molnar | 36dfe92 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 1825 | err = cpumask_parse_user(ubuf, count, tracing_cpumask_new); |
| 1826 | if (err) |
| 1827 | goto err_unlock; |
| 1828 | |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 1829 | raw_local_irq_disable(); |
| 1830 | __raw_spin_lock(&ftrace_max_lock); |
Ingo Molnar | 36dfe92 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 1831 | for_each_possible_cpu(cpu) { |
| 1832 | /* |
| 1833 | * Increase/decrease the disabled counter if we are |
| 1834 | * about to flip a bit in the cpumask: |
| 1835 | */ |
| 1836 | if (cpu_isset(cpu, tracing_cpumask) && |
| 1837 | !cpu_isset(cpu, tracing_cpumask_new)) { |
| 1838 | atomic_inc(&global_trace.data[cpu]->disabled); |
| 1839 | } |
| 1840 | if (!cpu_isset(cpu, tracing_cpumask) && |
| 1841 | cpu_isset(cpu, tracing_cpumask_new)) { |
| 1842 | atomic_dec(&global_trace.data[cpu]->disabled); |
| 1843 | } |
| 1844 | } |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 1845 | __raw_spin_unlock(&ftrace_max_lock); |
| 1846 | raw_local_irq_enable(); |
Ingo Molnar | 36dfe92 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 1847 | |
| 1848 | tracing_cpumask = tracing_cpumask_new; |
| 1849 | |
Ingo Molnar | c7078de | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 1850 | mutex_unlock(&tracing_cpumask_update_lock); |
| 1851 | |
Ingo Molnar | c7078de | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 1852 | return count; |
Ingo Molnar | 36dfe92 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 1853 | |
| 1854 | err_unlock: |
| 1855 | mutex_unlock(&tracing_cpumask_update_lock); |
| 1856 | |
| 1857 | return err; |
Ingo Molnar | c7078de | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 1858 | } |
| 1859 | |
| 1860 | static struct file_operations tracing_cpumask_fops = { |
| 1861 | .open = tracing_open_generic, |
| 1862 | .read = tracing_cpumask_read, |
| 1863 | .write = tracing_cpumask_write, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1864 | }; |
| 1865 | |
| 1866 | static ssize_t |
| 1867 | tracing_iter_ctrl_read(struct file *filp, char __user *ubuf, |
| 1868 | size_t cnt, loff_t *ppos) |
| 1869 | { |
| 1870 | char *buf; |
| 1871 | int r = 0; |
| 1872 | int len = 0; |
| 1873 | int i; |
| 1874 | |
| 1875 | /* calulate max size */ |
| 1876 | for (i = 0; trace_options[i]; i++) { |
| 1877 | len += strlen(trace_options[i]); |
| 1878 | len += 3; /* "no" and space */ |
| 1879 | } |
| 1880 | |
| 1881 | /* +2 for \n and \0 */ |
| 1882 | buf = kmalloc(len + 2, GFP_KERNEL); |
| 1883 | if (!buf) |
| 1884 | return -ENOMEM; |
| 1885 | |
| 1886 | for (i = 0; trace_options[i]; i++) { |
| 1887 | if (trace_flags & (1 << i)) |
| 1888 | r += sprintf(buf + r, "%s ", trace_options[i]); |
| 1889 | else |
| 1890 | r += sprintf(buf + r, "no%s ", trace_options[i]); |
| 1891 | } |
| 1892 | |
| 1893 | r += sprintf(buf + r, "\n"); |
| 1894 | WARN_ON(r >= len + 2); |
| 1895 | |
Ingo Molnar | 36dfe92 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 1896 | r = simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1897 | |
| 1898 | kfree(buf); |
| 1899 | |
| 1900 | return r; |
| 1901 | } |
| 1902 | |
| 1903 | static ssize_t |
| 1904 | tracing_iter_ctrl_write(struct file *filp, const char __user *ubuf, |
| 1905 | size_t cnt, loff_t *ppos) |
| 1906 | { |
| 1907 | char buf[64]; |
| 1908 | char *cmp = buf; |
| 1909 | int neg = 0; |
| 1910 | int i; |
| 1911 | |
| 1912 | if (cnt > 63) |
| 1913 | cnt = 63; |
| 1914 | |
| 1915 | if (copy_from_user(&buf, ubuf, cnt)) |
| 1916 | return -EFAULT; |
| 1917 | |
| 1918 | buf[cnt] = 0; |
| 1919 | |
| 1920 | if (strncmp(buf, "no", 2) == 0) { |
| 1921 | neg = 1; |
| 1922 | cmp += 2; |
| 1923 | } |
| 1924 | |
| 1925 | for (i = 0; trace_options[i]; i++) { |
| 1926 | int len = strlen(trace_options[i]); |
| 1927 | |
| 1928 | if (strncmp(cmp, trace_options[i], len) == 0) { |
| 1929 | if (neg) |
| 1930 | trace_flags &= ~(1 << i); |
| 1931 | else |
| 1932 | trace_flags |= (1 << i); |
| 1933 | break; |
| 1934 | } |
| 1935 | } |
Ingo Molnar | 442e544 | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1936 | /* |
| 1937 | * If no option could be set, return an error: |
| 1938 | */ |
| 1939 | if (!trace_options[i]) |
| 1940 | return -EINVAL; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1941 | |
| 1942 | filp->f_pos += cnt; |
| 1943 | |
| 1944 | return cnt; |
| 1945 | } |
| 1946 | |
| 1947 | static struct file_operations tracing_iter_fops = { |
Ingo Molnar | c7078de | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 1948 | .open = tracing_open_generic, |
| 1949 | .read = tracing_iter_ctrl_read, |
| 1950 | .write = tracing_iter_ctrl_write, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1951 | }; |
| 1952 | |
Ingo Molnar | 7bd2f24 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 1953 | static const char readme_msg[] = |
| 1954 | "tracing mini-HOWTO:\n\n" |
| 1955 | "# mkdir /debug\n" |
| 1956 | "# mount -t debugfs nodev /debug\n\n" |
| 1957 | "# cat /debug/tracing/available_tracers\n" |
| 1958 | "wakeup preemptirqsoff preemptoff irqsoff ftrace sched_switch none\n\n" |
| 1959 | "# cat /debug/tracing/current_tracer\n" |
| 1960 | "none\n" |
| 1961 | "# echo sched_switch > /debug/tracing/current_tracer\n" |
| 1962 | "# cat /debug/tracing/current_tracer\n" |
| 1963 | "sched_switch\n" |
| 1964 | "# cat /debug/tracing/iter_ctrl\n" |
| 1965 | "noprint-parent nosym-offset nosym-addr noverbose\n" |
| 1966 | "# echo print-parent > /debug/tracing/iter_ctrl\n" |
| 1967 | "# echo 1 > /debug/tracing/tracing_enabled\n" |
| 1968 | "# cat /debug/tracing/trace > /tmp/trace.txt\n" |
| 1969 | "echo 0 > /debug/tracing/tracing_enabled\n" |
| 1970 | ; |
| 1971 | |
| 1972 | static ssize_t |
| 1973 | tracing_readme_read(struct file *filp, char __user *ubuf, |
| 1974 | size_t cnt, loff_t *ppos) |
| 1975 | { |
| 1976 | return simple_read_from_buffer(ubuf, cnt, ppos, |
| 1977 | readme_msg, strlen(readme_msg)); |
| 1978 | } |
| 1979 | |
| 1980 | static struct file_operations tracing_readme_fops = { |
Ingo Molnar | c7078de | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 1981 | .open = tracing_open_generic, |
| 1982 | .read = tracing_readme_read, |
Ingo Molnar | 7bd2f24 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 1983 | }; |
| 1984 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1985 | static ssize_t |
| 1986 | tracing_ctrl_read(struct file *filp, char __user *ubuf, |
| 1987 | size_t cnt, loff_t *ppos) |
| 1988 | { |
| 1989 | struct trace_array *tr = filp->private_data; |
| 1990 | char buf[64]; |
| 1991 | int r; |
| 1992 | |
| 1993 | r = sprintf(buf, "%ld\n", tr->ctrl); |
Ingo Molnar | 4e3c333 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 1994 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1995 | } |
| 1996 | |
| 1997 | static ssize_t |
| 1998 | tracing_ctrl_write(struct file *filp, const char __user *ubuf, |
| 1999 | size_t cnt, loff_t *ppos) |
| 2000 | { |
| 2001 | struct trace_array *tr = filp->private_data; |
| 2002 | long val; |
| 2003 | char buf[64]; |
| 2004 | |
| 2005 | if (cnt > 63) |
| 2006 | cnt = 63; |
| 2007 | |
| 2008 | if (copy_from_user(&buf, ubuf, cnt)) |
| 2009 | return -EFAULT; |
| 2010 | |
| 2011 | buf[cnt] = 0; |
| 2012 | |
| 2013 | val = simple_strtoul(buf, NULL, 10); |
| 2014 | |
| 2015 | val = !!val; |
| 2016 | |
| 2017 | mutex_lock(&trace_types_lock); |
| 2018 | if (tr->ctrl ^ val) { |
| 2019 | if (val) |
| 2020 | tracer_enabled = 1; |
| 2021 | else |
| 2022 | tracer_enabled = 0; |
| 2023 | |
| 2024 | tr->ctrl = val; |
| 2025 | |
| 2026 | if (current_trace && current_trace->ctrl_update) |
| 2027 | current_trace->ctrl_update(tr); |
| 2028 | } |
| 2029 | mutex_unlock(&trace_types_lock); |
| 2030 | |
| 2031 | filp->f_pos += cnt; |
| 2032 | |
| 2033 | return cnt; |
| 2034 | } |
| 2035 | |
| 2036 | static ssize_t |
| 2037 | tracing_set_trace_read(struct file *filp, char __user *ubuf, |
| 2038 | size_t cnt, loff_t *ppos) |
| 2039 | { |
| 2040 | char buf[max_tracer_type_len+2]; |
| 2041 | int r; |
| 2042 | |
| 2043 | mutex_lock(&trace_types_lock); |
| 2044 | if (current_trace) |
| 2045 | r = sprintf(buf, "%s\n", current_trace->name); |
| 2046 | else |
| 2047 | r = sprintf(buf, "\n"); |
| 2048 | mutex_unlock(&trace_types_lock); |
| 2049 | |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2050 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2051 | } |
| 2052 | |
| 2053 | static ssize_t |
| 2054 | tracing_set_trace_write(struct file *filp, const char __user *ubuf, |
| 2055 | size_t cnt, loff_t *ppos) |
| 2056 | { |
| 2057 | struct trace_array *tr = &global_trace; |
| 2058 | struct tracer *t; |
| 2059 | char buf[max_tracer_type_len+1]; |
| 2060 | int i; |
| 2061 | |
| 2062 | if (cnt > max_tracer_type_len) |
| 2063 | cnt = max_tracer_type_len; |
| 2064 | |
| 2065 | if (copy_from_user(&buf, ubuf, cnt)) |
| 2066 | return -EFAULT; |
| 2067 | |
| 2068 | buf[cnt] = 0; |
| 2069 | |
| 2070 | /* strip ending whitespace. */ |
| 2071 | for (i = cnt - 1; i > 0 && isspace(buf[i]); i--) |
| 2072 | buf[i] = 0; |
| 2073 | |
| 2074 | mutex_lock(&trace_types_lock); |
| 2075 | for (t = trace_types; t; t = t->next) { |
| 2076 | if (strcmp(t->name, buf) == 0) |
| 2077 | break; |
| 2078 | } |
| 2079 | if (!t || t == current_trace) |
| 2080 | goto out; |
| 2081 | |
| 2082 | if (current_trace && current_trace->reset) |
| 2083 | current_trace->reset(tr); |
| 2084 | |
| 2085 | current_trace = t; |
| 2086 | if (t->init) |
| 2087 | t->init(tr); |
| 2088 | |
| 2089 | out: |
| 2090 | mutex_unlock(&trace_types_lock); |
| 2091 | |
| 2092 | filp->f_pos += cnt; |
| 2093 | |
| 2094 | return cnt; |
| 2095 | } |
| 2096 | |
| 2097 | static ssize_t |
| 2098 | tracing_max_lat_read(struct file *filp, char __user *ubuf, |
| 2099 | size_t cnt, loff_t *ppos) |
| 2100 | { |
| 2101 | unsigned long *ptr = filp->private_data; |
| 2102 | char buf[64]; |
| 2103 | int r; |
| 2104 | |
| 2105 | r = snprintf(buf, 64, "%ld\n", |
| 2106 | *ptr == (unsigned long)-1 ? -1 : nsecs_to_usecs(*ptr)); |
| 2107 | if (r > 64) |
| 2108 | r = 64; |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2109 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2110 | } |
| 2111 | |
| 2112 | static ssize_t |
| 2113 | tracing_max_lat_write(struct file *filp, const char __user *ubuf, |
| 2114 | size_t cnt, loff_t *ppos) |
| 2115 | { |
| 2116 | long *ptr = filp->private_data; |
| 2117 | long val; |
| 2118 | char buf[64]; |
| 2119 | |
| 2120 | if (cnt > 63) |
| 2121 | cnt = 63; |
| 2122 | |
| 2123 | if (copy_from_user(&buf, ubuf, cnt)) |
| 2124 | return -EFAULT; |
| 2125 | |
| 2126 | buf[cnt] = 0; |
| 2127 | |
| 2128 | val = simple_strtoul(buf, NULL, 10); |
| 2129 | |
| 2130 | *ptr = val * 1000; |
| 2131 | |
| 2132 | return cnt; |
| 2133 | } |
| 2134 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2135 | static atomic_t tracing_reader; |
| 2136 | |
| 2137 | static int tracing_open_pipe(struct inode *inode, struct file *filp) |
| 2138 | { |
| 2139 | struct trace_iterator *iter; |
| 2140 | |
| 2141 | if (tracing_disabled) |
| 2142 | return -ENODEV; |
| 2143 | |
| 2144 | /* We only allow for reader of the pipe */ |
| 2145 | if (atomic_inc_return(&tracing_reader) != 1) { |
| 2146 | atomic_dec(&tracing_reader); |
| 2147 | return -EBUSY; |
| 2148 | } |
| 2149 | |
| 2150 | /* create a buffer to store the information to pass to userspace */ |
| 2151 | iter = kzalloc(sizeof(*iter), GFP_KERNEL); |
| 2152 | if (!iter) |
| 2153 | return -ENOMEM; |
| 2154 | |
| 2155 | iter->tr = &global_trace; |
Thomas Gleixner | 72829bc | 2008-05-23 21:37:28 +0200 | [diff] [blame^] | 2156 | iter->trace = current_trace; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2157 | |
| 2158 | filp->private_data = iter; |
| 2159 | |
| 2160 | return 0; |
| 2161 | } |
| 2162 | |
| 2163 | static int tracing_release_pipe(struct inode *inode, struct file *file) |
| 2164 | { |
| 2165 | struct trace_iterator *iter = file->private_data; |
| 2166 | |
| 2167 | kfree(iter); |
| 2168 | atomic_dec(&tracing_reader); |
| 2169 | |
| 2170 | return 0; |
| 2171 | } |
| 2172 | |
Soeren Sandmann Pedersen | 2a2cc8f | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2173 | static unsigned int |
| 2174 | tracing_poll_pipe(struct file *filp, poll_table *poll_table) |
| 2175 | { |
| 2176 | struct trace_iterator *iter = filp->private_data; |
| 2177 | |
| 2178 | if (trace_flags & TRACE_ITER_BLOCK) { |
| 2179 | /* |
| 2180 | * Always select as readable when in blocking mode |
| 2181 | */ |
| 2182 | return POLLIN | POLLRDNORM; |
| 2183 | } |
| 2184 | else { |
| 2185 | if (!trace_empty(iter)) |
| 2186 | return POLLIN | POLLRDNORM; |
| 2187 | poll_wait(filp, &trace_wait, poll_table); |
| 2188 | if (!trace_empty(iter)) |
| 2189 | return POLLIN | POLLRDNORM; |
| 2190 | |
| 2191 | return 0; |
| 2192 | } |
| 2193 | } |
| 2194 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2195 | /* |
| 2196 | * Consumer reader. |
| 2197 | */ |
| 2198 | static ssize_t |
| 2199 | tracing_read_pipe(struct file *filp, char __user *ubuf, |
| 2200 | size_t cnt, loff_t *ppos) |
| 2201 | { |
| 2202 | struct trace_iterator *iter = filp->private_data; |
| 2203 | struct trace_array_cpu *data; |
| 2204 | static cpumask_t mask; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2205 | static int start; |
| 2206 | unsigned long flags; |
Ingo Molnar | 2577046 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2207 | #ifdef CONFIG_FTRACE |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2208 | int ftrace_save; |
Ingo Molnar | 2577046 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2209 | #endif |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2210 | int read = 0; |
| 2211 | int cpu; |
| 2212 | int len; |
| 2213 | int ret; |
| 2214 | |
| 2215 | /* return any leftover data */ |
| 2216 | if (iter->seq.len > start) { |
| 2217 | len = iter->seq.len - start; |
| 2218 | if (cnt > len) |
| 2219 | cnt = len; |
| 2220 | ret = copy_to_user(ubuf, iter->seq.buffer + start, cnt); |
| 2221 | if (ret) |
| 2222 | cnt = -EFAULT; |
| 2223 | |
| 2224 | start += len; |
| 2225 | |
| 2226 | return cnt; |
| 2227 | } |
| 2228 | |
| 2229 | trace_seq_reset(&iter->seq); |
| 2230 | start = 0; |
| 2231 | |
| 2232 | while (trace_empty(iter)) { |
Soeren Sandmann Pedersen | 2a2cc8f | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2233 | if (!(trace_flags & TRACE_ITER_BLOCK)) |
| 2234 | return -EWOULDBLOCK; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2235 | /* |
| 2236 | * This is a make-shift waitqueue. The reason we don't use |
| 2237 | * an actual wait queue is because: |
| 2238 | * 1) we only ever have one waiter |
| 2239 | * 2) the tracing, traces all functions, we don't want |
| 2240 | * the overhead of calling wake_up and friends |
| 2241 | * (and tracing them too) |
| 2242 | * Anyway, this is really very primitive wakeup. |
| 2243 | */ |
| 2244 | set_current_state(TASK_INTERRUPTIBLE); |
| 2245 | iter->tr->waiter = current; |
| 2246 | |
| 2247 | /* sleep for one second, and try again. */ |
| 2248 | schedule_timeout(HZ); |
| 2249 | |
| 2250 | iter->tr->waiter = NULL; |
| 2251 | |
| 2252 | if (signal_pending(current)) |
| 2253 | return -EINTR; |
| 2254 | |
| 2255 | /* |
| 2256 | * We block until we read something and tracing is disabled. |
| 2257 | * We still block if tracing is disabled, but we have never |
| 2258 | * read anything. This allows a user to cat this file, and |
| 2259 | * then enable tracing. But after we have read something, |
| 2260 | * we give an EOF when tracing is again disabled. |
| 2261 | * |
| 2262 | * iter->pos will be 0 if we haven't read anything. |
| 2263 | */ |
| 2264 | if (!tracer_enabled && iter->pos) |
| 2265 | break; |
| 2266 | |
| 2267 | continue; |
| 2268 | } |
| 2269 | |
| 2270 | /* stop when tracing is finished */ |
| 2271 | if (trace_empty(iter)) |
| 2272 | return 0; |
| 2273 | |
| 2274 | if (cnt >= PAGE_SIZE) |
| 2275 | cnt = PAGE_SIZE - 1; |
| 2276 | |
| 2277 | memset(iter, 0, sizeof(*iter)); |
| 2278 | iter->tr = &global_trace; |
| 2279 | iter->pos = -1; |
| 2280 | |
| 2281 | /* |
| 2282 | * We need to stop all tracing on all CPUS to read the |
| 2283 | * the next buffer. This is a bit expensive, but is |
| 2284 | * not done often. We fill all what we can read, |
| 2285 | * and then release the locks again. |
| 2286 | */ |
| 2287 | |
| 2288 | cpus_clear(mask); |
| 2289 | local_irq_save(flags); |
Ingo Molnar | 2577046 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2290 | #ifdef CONFIG_FTRACE |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2291 | ftrace_save = ftrace_enabled; |
| 2292 | ftrace_enabled = 0; |
Ingo Molnar | 2577046 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2293 | #endif |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2294 | smp_wmb(); |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2295 | for_each_possible_cpu(cpu) { |
| 2296 | data = iter->tr->data[cpu]; |
| 2297 | |
| 2298 | if (!head_page(data) || !data->trace_idx) |
| 2299 | continue; |
| 2300 | |
| 2301 | atomic_inc(&data->disabled); |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2302 | cpu_set(cpu, mask); |
| 2303 | } |
| 2304 | |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2305 | for_each_cpu_mask(cpu, mask) { |
| 2306 | data = iter->tr->data[cpu]; |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 2307 | __raw_spin_lock(&data->lock); |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2308 | } |
| 2309 | |
Steven Rostedt | 088b1e4 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 2310 | while (find_next_entry_inc(iter) != NULL) { |
| 2311 | int len = iter->seq.len; |
| 2312 | |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 2313 | ret = print_trace_line(iter); |
Steven Rostedt | 088b1e4 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 2314 | if (!ret) { |
| 2315 | /* don't print partial lines */ |
| 2316 | iter->seq.len = len; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2317 | break; |
Steven Rostedt | 088b1e4 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 2318 | } |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2319 | |
| 2320 | trace_consume(iter); |
| 2321 | |
| 2322 | if (iter->seq.len >= cnt) |
| 2323 | break; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2324 | } |
| 2325 | |
Ingo Molnar | d4c5a2f | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2326 | for_each_cpu_mask(cpu, mask) { |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2327 | data = iter->tr->data[cpu]; |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 2328 | __raw_spin_unlock(&data->lock); |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2329 | } |
| 2330 | |
| 2331 | for_each_cpu_mask(cpu, mask) { |
| 2332 | data = iter->tr->data[cpu]; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2333 | atomic_dec(&data->disabled); |
| 2334 | } |
Ingo Molnar | 2577046 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2335 | #ifdef CONFIG_FTRACE |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2336 | ftrace_enabled = ftrace_save; |
Ingo Molnar | 2577046 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2337 | #endif |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2338 | local_irq_restore(flags); |
| 2339 | |
| 2340 | /* Now copy what we have to the user */ |
| 2341 | read = iter->seq.len; |
| 2342 | if (read > cnt) |
| 2343 | read = cnt; |
| 2344 | |
| 2345 | ret = copy_to_user(ubuf, iter->seq.buffer, read); |
| 2346 | |
| 2347 | if (read < iter->seq.len) |
| 2348 | start = read; |
| 2349 | else |
| 2350 | trace_seq_reset(&iter->seq); |
| 2351 | |
| 2352 | if (ret) |
| 2353 | read = -EFAULT; |
| 2354 | |
| 2355 | return read; |
| 2356 | } |
| 2357 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2358 | static struct file_operations tracing_max_lat_fops = { |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2359 | .open = tracing_open_generic, |
| 2360 | .read = tracing_max_lat_read, |
| 2361 | .write = tracing_max_lat_write, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2362 | }; |
| 2363 | |
| 2364 | static struct file_operations tracing_ctrl_fops = { |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2365 | .open = tracing_open_generic, |
| 2366 | .read = tracing_ctrl_read, |
| 2367 | .write = tracing_ctrl_write, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2368 | }; |
| 2369 | |
| 2370 | static struct file_operations set_tracer_fops = { |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2371 | .open = tracing_open_generic, |
| 2372 | .read = tracing_set_trace_read, |
| 2373 | .write = tracing_set_trace_write, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2374 | }; |
| 2375 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2376 | static struct file_operations tracing_pipe_fops = { |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2377 | .open = tracing_open_pipe, |
Soeren Sandmann Pedersen | 2a2cc8f | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2378 | .poll = tracing_poll_pipe, |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2379 | .read = tracing_read_pipe, |
| 2380 | .release = tracing_release_pipe, |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2381 | }; |
| 2382 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2383 | #ifdef CONFIG_DYNAMIC_FTRACE |
| 2384 | |
| 2385 | static ssize_t |
| 2386 | tracing_read_long(struct file *filp, char __user *ubuf, |
| 2387 | size_t cnt, loff_t *ppos) |
| 2388 | { |
| 2389 | unsigned long *p = filp->private_data; |
| 2390 | char buf[64]; |
| 2391 | int r; |
| 2392 | |
| 2393 | r = sprintf(buf, "%ld\n", *p); |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2394 | |
| 2395 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2396 | } |
| 2397 | |
| 2398 | static struct file_operations tracing_read_long_fops = { |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2399 | .open = tracing_open_generic, |
| 2400 | .read = tracing_read_long, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2401 | }; |
| 2402 | #endif |
| 2403 | |
| 2404 | static struct dentry *d_tracer; |
| 2405 | |
| 2406 | struct dentry *tracing_init_dentry(void) |
| 2407 | { |
| 2408 | static int once; |
| 2409 | |
| 2410 | if (d_tracer) |
| 2411 | return d_tracer; |
| 2412 | |
| 2413 | d_tracer = debugfs_create_dir("tracing", NULL); |
| 2414 | |
| 2415 | if (!d_tracer && !once) { |
| 2416 | once = 1; |
| 2417 | pr_warning("Could not create debugfs directory 'tracing'\n"); |
| 2418 | return NULL; |
| 2419 | } |
| 2420 | |
| 2421 | return d_tracer; |
| 2422 | } |
| 2423 | |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 2424 | #ifdef CONFIG_FTRACE_SELFTEST |
| 2425 | /* Let selftest have access to static functions in this file */ |
| 2426 | #include "trace_selftest.c" |
| 2427 | #endif |
| 2428 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2429 | static __init void tracer_init_debugfs(void) |
| 2430 | { |
| 2431 | struct dentry *d_tracer; |
| 2432 | struct dentry *entry; |
| 2433 | |
| 2434 | d_tracer = tracing_init_dentry(); |
| 2435 | |
| 2436 | entry = debugfs_create_file("tracing_enabled", 0644, d_tracer, |
| 2437 | &global_trace, &tracing_ctrl_fops); |
| 2438 | if (!entry) |
| 2439 | pr_warning("Could not create debugfs 'tracing_enabled' entry\n"); |
| 2440 | |
| 2441 | entry = debugfs_create_file("iter_ctrl", 0644, d_tracer, |
| 2442 | NULL, &tracing_iter_fops); |
| 2443 | if (!entry) |
| 2444 | pr_warning("Could not create debugfs 'iter_ctrl' entry\n"); |
| 2445 | |
Ingo Molnar | c7078de | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2446 | entry = debugfs_create_file("tracing_cpumask", 0644, d_tracer, |
| 2447 | NULL, &tracing_cpumask_fops); |
| 2448 | if (!entry) |
| 2449 | pr_warning("Could not create debugfs 'tracing_cpumask' entry\n"); |
| 2450 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2451 | entry = debugfs_create_file("latency_trace", 0444, d_tracer, |
| 2452 | &global_trace, &tracing_lt_fops); |
| 2453 | if (!entry) |
| 2454 | pr_warning("Could not create debugfs 'latency_trace' entry\n"); |
| 2455 | |
| 2456 | entry = debugfs_create_file("trace", 0444, d_tracer, |
| 2457 | &global_trace, &tracing_fops); |
| 2458 | if (!entry) |
| 2459 | pr_warning("Could not create debugfs 'trace' entry\n"); |
| 2460 | |
| 2461 | entry = debugfs_create_file("available_tracers", 0444, d_tracer, |
| 2462 | &global_trace, &show_traces_fops); |
| 2463 | if (!entry) |
| 2464 | pr_warning("Could not create debugfs 'trace' entry\n"); |
| 2465 | |
| 2466 | entry = debugfs_create_file("current_tracer", 0444, d_tracer, |
| 2467 | &global_trace, &set_tracer_fops); |
| 2468 | if (!entry) |
| 2469 | pr_warning("Could not create debugfs 'trace' entry\n"); |
| 2470 | |
| 2471 | entry = debugfs_create_file("tracing_max_latency", 0644, d_tracer, |
| 2472 | &tracing_max_latency, |
| 2473 | &tracing_max_lat_fops); |
| 2474 | if (!entry) |
| 2475 | pr_warning("Could not create debugfs " |
| 2476 | "'tracing_max_latency' entry\n"); |
| 2477 | |
| 2478 | entry = debugfs_create_file("tracing_thresh", 0644, d_tracer, |
| 2479 | &tracing_thresh, &tracing_max_lat_fops); |
| 2480 | if (!entry) |
| 2481 | pr_warning("Could not create debugfs " |
| 2482 | "'tracing_threash' entry\n"); |
Ingo Molnar | 7bd2f24 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 2483 | entry = debugfs_create_file("README", 0644, d_tracer, |
| 2484 | NULL, &tracing_readme_fops); |
| 2485 | if (!entry) |
| 2486 | pr_warning("Could not create debugfs 'README' entry\n"); |
| 2487 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2488 | entry = debugfs_create_file("trace_pipe", 0644, d_tracer, |
| 2489 | NULL, &tracing_pipe_fops); |
| 2490 | if (!entry) |
| 2491 | pr_warning("Could not create debugfs " |
| 2492 | "'tracing_threash' entry\n"); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2493 | |
| 2494 | #ifdef CONFIG_DYNAMIC_FTRACE |
| 2495 | entry = debugfs_create_file("dyn_ftrace_total_info", 0444, d_tracer, |
| 2496 | &ftrace_update_tot_cnt, |
| 2497 | &tracing_read_long_fops); |
| 2498 | if (!entry) |
| 2499 | pr_warning("Could not create debugfs " |
| 2500 | "'dyn_ftrace_total_info' entry\n"); |
| 2501 | #endif |
| 2502 | } |
| 2503 | |
| 2504 | /* dummy trace to disable tracing */ |
| 2505 | static struct tracer no_tracer __read_mostly = |
| 2506 | { |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2507 | .name = "none", |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2508 | }; |
| 2509 | |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2510 | static int trace_alloc_page(void) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2511 | { |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2512 | struct trace_array_cpu *data; |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2513 | struct page *page, *tmp; |
| 2514 | LIST_HEAD(pages); |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 2515 | void *array; |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2516 | int i; |
| 2517 | |
| 2518 | /* first allocate a page for each CPU */ |
| 2519 | for_each_possible_cpu(i) { |
| 2520 | array = (void *)__get_free_page(GFP_KERNEL); |
| 2521 | if (array == NULL) { |
| 2522 | printk(KERN_ERR "tracer: failed to allocate page" |
| 2523 | "for trace buffer!\n"); |
| 2524 | goto free_pages; |
| 2525 | } |
| 2526 | |
| 2527 | page = virt_to_page(array); |
| 2528 | list_add(&page->lru, &pages); |
| 2529 | |
| 2530 | /* Only allocate if we are actually using the max trace */ |
| 2531 | #ifdef CONFIG_TRACER_MAX_TRACE |
| 2532 | array = (void *)__get_free_page(GFP_KERNEL); |
| 2533 | if (array == NULL) { |
| 2534 | printk(KERN_ERR "tracer: failed to allocate page" |
| 2535 | "for trace buffer!\n"); |
| 2536 | goto free_pages; |
| 2537 | } |
| 2538 | page = virt_to_page(array); |
| 2539 | list_add(&page->lru, &pages); |
| 2540 | #endif |
| 2541 | } |
| 2542 | |
| 2543 | /* Now that we successfully allocate a page per CPU, add them */ |
| 2544 | for_each_possible_cpu(i) { |
| 2545 | data = global_trace.data[i]; |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 2546 | data->lock = (raw_spinlock_t)__RAW_SPIN_LOCK_UNLOCKED; |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2547 | page = list_entry(pages.next, struct page, lru); |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 2548 | list_del_init(&page->lru); |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2549 | list_add_tail(&page->lru, &data->trace_pages); |
| 2550 | ClearPageLRU(page); |
| 2551 | |
| 2552 | #ifdef CONFIG_TRACER_MAX_TRACE |
| 2553 | data = max_tr.data[i]; |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 2554 | data->lock = (raw_spinlock_t)__RAW_SPIN_LOCK_UNLOCKED; |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2555 | page = list_entry(pages.next, struct page, lru); |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 2556 | list_del_init(&page->lru); |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2557 | list_add_tail(&page->lru, &data->trace_pages); |
| 2558 | SetPageLRU(page); |
| 2559 | #endif |
| 2560 | } |
| 2561 | global_trace.entries += ENTRIES_PER_PAGE; |
| 2562 | |
| 2563 | return 0; |
| 2564 | |
| 2565 | free_pages: |
| 2566 | list_for_each_entry_safe(page, tmp, &pages, lru) { |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 2567 | list_del_init(&page->lru); |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2568 | __free_page(page); |
| 2569 | } |
| 2570 | return -ENOMEM; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2571 | } |
| 2572 | |
| 2573 | __init static int tracer_alloc_buffers(void) |
| 2574 | { |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2575 | struct trace_array_cpu *data; |
| 2576 | void *array; |
| 2577 | struct page *page; |
| 2578 | int pages = 0; |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 2579 | int ret = -ENOMEM; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2580 | int i; |
| 2581 | |
Steven Rostedt | 26994ea | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 2582 | global_trace.ctrl = tracer_enabled; |
| 2583 | |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2584 | /* Allocate the first page for all buffers */ |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2585 | for_each_possible_cpu(i) { |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2586 | data = global_trace.data[i] = &per_cpu(global_trace_cpu, i); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2587 | max_tr.data[i] = &per_cpu(max_data, i); |
| 2588 | |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2589 | array = (void *)__get_free_page(GFP_KERNEL); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2590 | if (array == NULL) { |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2591 | printk(KERN_ERR "tracer: failed to allocate page" |
| 2592 | "for trace buffer!\n"); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2593 | goto free_buffers; |
| 2594 | } |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2595 | |
| 2596 | /* set the array to the list */ |
| 2597 | INIT_LIST_HEAD(&data->trace_pages); |
| 2598 | page = virt_to_page(array); |
| 2599 | list_add(&page->lru, &data->trace_pages); |
| 2600 | /* use the LRU flag to differentiate the two buffers */ |
| 2601 | ClearPageLRU(page); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2602 | |
| 2603 | /* Only allocate if we are actually using the max trace */ |
| 2604 | #ifdef CONFIG_TRACER_MAX_TRACE |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2605 | array = (void *)__get_free_page(GFP_KERNEL); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2606 | if (array == NULL) { |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2607 | printk(KERN_ERR "tracer: failed to allocate page" |
| 2608 | "for trace buffer!\n"); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2609 | goto free_buffers; |
| 2610 | } |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2611 | |
| 2612 | INIT_LIST_HEAD(&max_tr.data[i]->trace_pages); |
| 2613 | page = virt_to_page(array); |
| 2614 | list_add(&page->lru, &max_tr.data[i]->trace_pages); |
| 2615 | SetPageLRU(page); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2616 | #endif |
| 2617 | } |
| 2618 | |
| 2619 | /* |
| 2620 | * Since we allocate by orders of pages, we may be able to |
| 2621 | * round up a bit. |
| 2622 | */ |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2623 | global_trace.entries = ENTRIES_PER_PAGE; |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2624 | pages++; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2625 | |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2626 | while (global_trace.entries < trace_nr_entries) { |
| 2627 | if (trace_alloc_page()) |
| 2628 | break; |
| 2629 | pages++; |
| 2630 | } |
Steven Rostedt | 89b2f97 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 2631 | max_tr.entries = global_trace.entries; |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2632 | |
| 2633 | pr_info("tracer: %d pages allocated for %ld", |
| 2634 | pages, trace_nr_entries); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2635 | pr_info(" entries of %ld bytes\n", (long)TRACE_ENTRY_SIZE); |
| 2636 | pr_info(" actual entries %ld\n", global_trace.entries); |
| 2637 | |
| 2638 | tracer_init_debugfs(); |
| 2639 | |
| 2640 | trace_init_cmdlines(); |
| 2641 | |
| 2642 | register_tracer(&no_tracer); |
| 2643 | current_trace = &no_tracer; |
| 2644 | |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 2645 | /* All seems OK, enable tracing */ |
| 2646 | tracing_disabled = 0; |
| 2647 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2648 | return 0; |
| 2649 | |
| 2650 | free_buffers: |
| 2651 | for (i-- ; i >= 0; i--) { |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2652 | struct page *page, *tmp; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2653 | struct trace_array_cpu *data = global_trace.data[i]; |
| 2654 | |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 2655 | if (data) { |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2656 | list_for_each_entry_safe(page, tmp, |
| 2657 | &data->trace_pages, lru) { |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 2658 | list_del_init(&page->lru); |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2659 | __free_page(page); |
| 2660 | } |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2661 | } |
| 2662 | |
| 2663 | #ifdef CONFIG_TRACER_MAX_TRACE |
| 2664 | data = max_tr.data[i]; |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 2665 | if (data) { |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2666 | list_for_each_entry_safe(page, tmp, |
| 2667 | &data->trace_pages, lru) { |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 2668 | list_del_init(&page->lru); |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2669 | __free_page(page); |
| 2670 | } |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2671 | } |
| 2672 | #endif |
| 2673 | } |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 2674 | return ret; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2675 | } |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 2676 | fs_initcall(tracer_alloc_buffers); |