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 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 40 | static 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_type { |
| 100 | __TRACE_FIRST_TYPE = 0, |
| 101 | |
| 102 | TRACE_FN, |
| 103 | TRACE_CTX, |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 104 | TRACE_WAKE, |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 105 | TRACE_STACK, |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 106 | TRACE_SPECIAL, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 107 | |
| 108 | __TRACE_LAST_TYPE |
| 109 | }; |
| 110 | |
| 111 | enum trace_flag_type { |
| 112 | TRACE_FLAG_IRQS_OFF = 0x01, |
| 113 | TRACE_FLAG_NEED_RESCHED = 0x02, |
| 114 | TRACE_FLAG_HARDIRQ = 0x04, |
| 115 | TRACE_FLAG_SOFTIRQ = 0x08, |
| 116 | }; |
| 117 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 118 | #define TRACE_ITER_SYM_MASK \ |
| 119 | (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR) |
| 120 | |
| 121 | /* These must match the bit postions above */ |
| 122 | static const char *trace_options[] = { |
| 123 | "print-parent", |
| 124 | "sym-offset", |
| 125 | "sym-addr", |
| 126 | "verbose", |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 127 | "raw", |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 128 | "hex", |
Ingo Molnar | cb0f12a | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 129 | "bin", |
Soeren Sandmann Pedersen | 2a2cc8f | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 130 | "block", |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 131 | "stacktrace", |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 132 | NULL |
| 133 | }; |
| 134 | |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 135 | static DEFINE_SPINLOCK(ftrace_max_lock); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 136 | |
| 137 | /* |
| 138 | * Copy the new maximum trace into the separate maximum-trace |
| 139 | * structure. (this way the maximum trace is permanently saved, |
| 140 | * for later retrieval via /debugfs/tracing/latency_trace) |
| 141 | */ |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 142 | static void |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 143 | __update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu) |
| 144 | { |
| 145 | struct trace_array_cpu *data = tr->data[cpu]; |
| 146 | |
| 147 | max_tr.cpu = cpu; |
| 148 | max_tr.time_start = data->preempt_timestamp; |
| 149 | |
| 150 | data = max_tr.data[cpu]; |
| 151 | data->saved_latency = tracing_max_latency; |
| 152 | |
| 153 | memcpy(data->comm, tsk->comm, TASK_COMM_LEN); |
| 154 | data->pid = tsk->pid; |
| 155 | data->uid = tsk->uid; |
| 156 | data->nice = tsk->static_prio - 20 - MAX_RT_PRIO; |
| 157 | data->policy = tsk->policy; |
| 158 | data->rt_priority = tsk->rt_priority; |
| 159 | |
| 160 | /* record this tasks comm */ |
| 161 | tracing_record_cmdline(current); |
| 162 | } |
| 163 | |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 164 | void check_pages(struct trace_array_cpu *data) |
| 165 | { |
| 166 | struct page *page, *tmp; |
| 167 | |
| 168 | BUG_ON(data->trace_pages.next->prev != &data->trace_pages); |
| 169 | BUG_ON(data->trace_pages.prev->next != &data->trace_pages); |
| 170 | |
| 171 | list_for_each_entry_safe(page, tmp, &data->trace_pages, lru) { |
| 172 | BUG_ON(page->lru.next->prev != &page->lru); |
| 173 | BUG_ON(page->lru.prev->next != &page->lru); |
| 174 | } |
| 175 | } |
| 176 | |
| 177 | void *head_page(struct trace_array_cpu *data) |
| 178 | { |
| 179 | struct page *page; |
| 180 | |
| 181 | check_pages(data); |
| 182 | if (list_empty(&data->trace_pages)) |
| 183 | return NULL; |
| 184 | |
| 185 | page = list_entry(data->trace_pages.next, struct page, lru); |
| 186 | BUG_ON(&page->lru == &data->trace_pages); |
| 187 | |
| 188 | return page_address(page); |
| 189 | } |
| 190 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 191 | static int |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 192 | trace_seq_printf(struct trace_seq *s, const char *fmt, ...) |
| 193 | { |
| 194 | int len = (PAGE_SIZE - 1) - s->len; |
| 195 | va_list ap; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 196 | int ret; |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 197 | |
| 198 | if (!len) |
| 199 | return 0; |
| 200 | |
| 201 | va_start(ap, fmt); |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 202 | ret = vsnprintf(s->buffer + s->len, len, fmt, ap); |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 203 | va_end(ap); |
| 204 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 205 | /* If we can't write it all, don't bother writing anything */ |
| 206 | if (ret > len) |
| 207 | return 0; |
| 208 | |
| 209 | s->len += ret; |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 210 | |
| 211 | return len; |
| 212 | } |
| 213 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 214 | static int |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 215 | trace_seq_puts(struct trace_seq *s, const char *str) |
| 216 | { |
| 217 | int len = strlen(str); |
| 218 | |
| 219 | if (len > ((PAGE_SIZE - 1) - s->len)) |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 220 | return 0; |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 221 | |
| 222 | memcpy(s->buffer + s->len, str, len); |
| 223 | s->len += len; |
| 224 | |
| 225 | return len; |
| 226 | } |
| 227 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 228 | static int |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 229 | trace_seq_putc(struct trace_seq *s, unsigned char c) |
| 230 | { |
| 231 | if (s->len >= (PAGE_SIZE - 1)) |
| 232 | return 0; |
| 233 | |
| 234 | s->buffer[s->len++] = c; |
| 235 | |
| 236 | return 1; |
| 237 | } |
| 238 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 239 | static int |
Ingo Molnar | cb0f12a | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 240 | trace_seq_putmem(struct trace_seq *s, void *mem, size_t len) |
| 241 | { |
| 242 | if (len > ((PAGE_SIZE - 1) - s->len)) |
| 243 | return 0; |
| 244 | |
| 245 | memcpy(s->buffer + s->len, mem, len); |
| 246 | s->len += len; |
| 247 | |
| 248 | return len; |
| 249 | } |
| 250 | |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 251 | #define HEX_CHARS 17 |
| 252 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 253 | static int |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 254 | trace_seq_putmem_hex(struct trace_seq *s, void *mem, size_t len) |
| 255 | { |
| 256 | unsigned char hex[HEX_CHARS]; |
| 257 | unsigned char *data; |
| 258 | unsigned char byte; |
| 259 | int i, j; |
| 260 | |
| 261 | BUG_ON(len >= HEX_CHARS); |
| 262 | |
| 263 | data = mem; |
| 264 | |
| 265 | #ifdef __BIG_ENDIAN |
| 266 | for (i = 0, j = 0; i < len; i++) { |
| 267 | #else |
| 268 | for (i = len-1, j = 0; i >= 0; i--) { |
| 269 | #endif |
| 270 | byte = data[i]; |
| 271 | |
| 272 | hex[j] = byte & 0x0f; |
| 273 | if (hex[j] >= 10) |
| 274 | hex[j] += 'a' - 10; |
| 275 | else |
| 276 | hex[j] += '0'; |
| 277 | j++; |
| 278 | |
| 279 | hex[j] = byte >> 4; |
| 280 | if (hex[j] >= 10) |
| 281 | hex[j] += 'a' - 10; |
| 282 | else |
| 283 | hex[j] += '0'; |
| 284 | j++; |
| 285 | } |
| 286 | hex[j] = ' '; |
| 287 | j++; |
| 288 | |
| 289 | return trace_seq_putmem(s, hex, j); |
| 290 | } |
| 291 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 292 | static void |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 293 | trace_seq_reset(struct trace_seq *s) |
| 294 | { |
| 295 | s->len = 0; |
| 296 | } |
| 297 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 298 | static void |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 299 | trace_print_seq(struct seq_file *m, struct trace_seq *s) |
| 300 | { |
| 301 | int len = s->len >= PAGE_SIZE ? PAGE_SIZE - 1 : s->len; |
| 302 | |
| 303 | s->buffer[len] = 0; |
| 304 | seq_puts(m, s->buffer); |
| 305 | |
| 306 | trace_seq_reset(s); |
| 307 | } |
| 308 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 309 | static void |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 310 | flip_trace(struct trace_array_cpu *tr1, struct trace_array_cpu *tr2) |
| 311 | { |
| 312 | struct list_head flip_pages; |
| 313 | |
| 314 | INIT_LIST_HEAD(&flip_pages); |
| 315 | |
Steven Rostedt | 93a588f | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 316 | memcpy(&tr1->trace_head_idx, &tr2->trace_head_idx, |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 317 | sizeof(struct trace_array_cpu) - |
Steven Rostedt | 93a588f | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 318 | offsetof(struct trace_array_cpu, trace_head_idx)); |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 319 | |
| 320 | check_pages(tr1); |
| 321 | check_pages(tr2); |
| 322 | list_splice_init(&tr1->trace_pages, &flip_pages); |
| 323 | list_splice_init(&tr2->trace_pages, &tr1->trace_pages); |
| 324 | list_splice_init(&flip_pages, &tr2->trace_pages); |
| 325 | BUG_ON(!list_empty(&flip_pages)); |
| 326 | check_pages(tr1); |
| 327 | check_pages(tr2); |
| 328 | } |
| 329 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 330 | void |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 331 | update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu) |
| 332 | { |
| 333 | struct trace_array_cpu *data; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 334 | int i; |
| 335 | |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 336 | WARN_ON_ONCE(!irqs_disabled()); |
| 337 | spin_lock(&ftrace_max_lock); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 338 | /* clear out all the previous traces */ |
| 339 | for_each_possible_cpu(i) { |
| 340 | data = tr->data[i]; |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 341 | flip_trace(max_tr.data[i], data); |
Steven Rostedt | 89b2f97 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 342 | tracing_reset(data); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 343 | } |
| 344 | |
| 345 | __update_max_tr(tr, tsk, cpu); |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 346 | spin_unlock(&ftrace_max_lock); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 347 | } |
| 348 | |
| 349 | /** |
| 350 | * update_max_tr_single - only copy one trace over, and reset the rest |
| 351 | * @tr - tracer |
| 352 | * @tsk - task with the latency |
| 353 | * @cpu - the cpu of the buffer to copy. |
| 354 | */ |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 355 | void |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 356 | update_max_tr_single(struct trace_array *tr, struct task_struct *tsk, int cpu) |
| 357 | { |
| 358 | struct trace_array_cpu *data = tr->data[cpu]; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 359 | int i; |
| 360 | |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 361 | WARN_ON_ONCE(!irqs_disabled()); |
| 362 | spin_lock(&ftrace_max_lock); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 363 | for_each_possible_cpu(i) |
| 364 | tracing_reset(max_tr.data[i]); |
| 365 | |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 366 | flip_trace(max_tr.data[cpu], data); |
Steven Rostedt | 89b2f97 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 367 | tracing_reset(data); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 368 | |
| 369 | __update_max_tr(tr, tsk, cpu); |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 370 | spin_unlock(&ftrace_max_lock); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 371 | } |
| 372 | |
| 373 | int register_tracer(struct tracer *type) |
| 374 | { |
| 375 | struct tracer *t; |
| 376 | int len; |
| 377 | int ret = 0; |
| 378 | |
| 379 | if (!type->name) { |
| 380 | pr_info("Tracer must have a name\n"); |
| 381 | return -1; |
| 382 | } |
| 383 | |
| 384 | mutex_lock(&trace_types_lock); |
| 385 | for (t = trace_types; t; t = t->next) { |
| 386 | if (strcmp(type->name, t->name) == 0) { |
| 387 | /* already found */ |
| 388 | pr_info("Trace %s already registered\n", |
| 389 | type->name); |
| 390 | ret = -1; |
| 391 | goto out; |
| 392 | } |
| 393 | } |
| 394 | |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 395 | #ifdef CONFIG_FTRACE_STARTUP_TEST |
| 396 | if (type->selftest) { |
| 397 | struct tracer *saved_tracer = current_trace; |
| 398 | struct trace_array_cpu *data; |
| 399 | struct trace_array *tr = &global_trace; |
| 400 | int saved_ctrl = tr->ctrl; |
| 401 | int i; |
| 402 | /* |
| 403 | * Run a selftest on this tracer. |
| 404 | * Here we reset the trace buffer, and set the current |
| 405 | * tracer to be this tracer. The tracer can then run some |
| 406 | * internal tracing to verify that everything is in order. |
| 407 | * If we fail, we do not register this tracer. |
| 408 | */ |
| 409 | for_each_possible_cpu(i) { |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 410 | data = tr->data[i]; |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 411 | if (!head_page(data)) |
| 412 | continue; |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 413 | tracing_reset(data); |
| 414 | } |
| 415 | current_trace = type; |
| 416 | tr->ctrl = 0; |
| 417 | /* the test is responsible for initializing and enabling */ |
| 418 | pr_info("Testing tracer %s: ", type->name); |
| 419 | ret = type->selftest(type, tr); |
| 420 | /* the test is responsible for resetting too */ |
| 421 | current_trace = saved_tracer; |
| 422 | tr->ctrl = saved_ctrl; |
| 423 | if (ret) { |
| 424 | printk(KERN_CONT "FAILED!\n"); |
| 425 | goto out; |
| 426 | } |
Steven Rostedt | 1d4db00 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 427 | /* Only reset on passing, to avoid touching corrupted buffers */ |
| 428 | for_each_possible_cpu(i) { |
| 429 | data = tr->data[i]; |
| 430 | if (!head_page(data)) |
| 431 | continue; |
| 432 | tracing_reset(data); |
| 433 | } |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 434 | printk(KERN_CONT "PASSED\n"); |
| 435 | } |
| 436 | #endif |
| 437 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 438 | type->next = trace_types; |
| 439 | trace_types = type; |
| 440 | len = strlen(type->name); |
| 441 | if (len > max_tracer_type_len) |
| 442 | max_tracer_type_len = len; |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 443 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 444 | out: |
| 445 | mutex_unlock(&trace_types_lock); |
| 446 | |
| 447 | return ret; |
| 448 | } |
| 449 | |
| 450 | void unregister_tracer(struct tracer *type) |
| 451 | { |
| 452 | struct tracer **t; |
| 453 | int len; |
| 454 | |
| 455 | mutex_lock(&trace_types_lock); |
| 456 | for (t = &trace_types; *t; t = &(*t)->next) { |
| 457 | if (*t == type) |
| 458 | goto found; |
| 459 | } |
| 460 | pr_info("Trace %s not registered\n", type->name); |
| 461 | goto out; |
| 462 | |
| 463 | found: |
| 464 | *t = (*t)->next; |
| 465 | if (strlen(type->name) != max_tracer_type_len) |
| 466 | goto out; |
| 467 | |
| 468 | max_tracer_type_len = 0; |
| 469 | for (t = &trace_types; *t; t = &(*t)->next) { |
| 470 | len = strlen((*t)->name); |
| 471 | if (len > max_tracer_type_len) |
| 472 | max_tracer_type_len = len; |
| 473 | } |
| 474 | out: |
| 475 | mutex_unlock(&trace_types_lock); |
| 476 | } |
| 477 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 478 | void tracing_reset(struct trace_array_cpu *data) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 479 | { |
| 480 | data->trace_idx = 0; |
Steven Rostedt | 93a588f | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 481 | data->trace_head = data->trace_tail = head_page(data); |
| 482 | data->trace_head_idx = 0; |
| 483 | data->trace_tail_idx = 0; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 484 | } |
| 485 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 486 | #define SAVED_CMDLINES 128 |
| 487 | static unsigned map_pid_to_cmdline[PID_MAX_DEFAULT+1]; |
| 488 | static unsigned map_cmdline_to_pid[SAVED_CMDLINES]; |
| 489 | static char saved_cmdlines[SAVED_CMDLINES][TASK_COMM_LEN]; |
| 490 | static int cmdline_idx; |
| 491 | static DEFINE_SPINLOCK(trace_cmdline_lock); |
| 492 | atomic_t trace_record_cmdline_disabled; |
| 493 | |
| 494 | static void trace_init_cmdlines(void) |
| 495 | { |
| 496 | memset(&map_pid_to_cmdline, -1, sizeof(map_pid_to_cmdline)); |
| 497 | memset(&map_cmdline_to_pid, -1, sizeof(map_cmdline_to_pid)); |
| 498 | cmdline_idx = 0; |
| 499 | } |
| 500 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 501 | void trace_stop_cmdline_recording(void); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 502 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 503 | static void trace_save_cmdline(struct task_struct *tsk) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 504 | { |
| 505 | unsigned map; |
| 506 | unsigned idx; |
| 507 | |
| 508 | if (!tsk->pid || unlikely(tsk->pid > PID_MAX_DEFAULT)) |
| 509 | return; |
| 510 | |
| 511 | /* |
| 512 | * It's not the end of the world if we don't get |
| 513 | * the lock, but we also don't want to spin |
| 514 | * nor do we want to disable interrupts, |
| 515 | * so if we miss here, then better luck next time. |
| 516 | */ |
| 517 | if (!spin_trylock(&trace_cmdline_lock)) |
| 518 | return; |
| 519 | |
| 520 | idx = map_pid_to_cmdline[tsk->pid]; |
| 521 | if (idx >= SAVED_CMDLINES) { |
| 522 | idx = (cmdline_idx + 1) % SAVED_CMDLINES; |
| 523 | |
| 524 | map = map_cmdline_to_pid[idx]; |
| 525 | if (map <= PID_MAX_DEFAULT) |
| 526 | map_pid_to_cmdline[map] = (unsigned)-1; |
| 527 | |
| 528 | map_pid_to_cmdline[tsk->pid] = idx; |
| 529 | |
| 530 | cmdline_idx = idx; |
| 531 | } |
| 532 | |
| 533 | memcpy(&saved_cmdlines[idx], tsk->comm, TASK_COMM_LEN); |
| 534 | |
| 535 | spin_unlock(&trace_cmdline_lock); |
| 536 | } |
| 537 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 538 | static char *trace_find_cmdline(int pid) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 539 | { |
| 540 | char *cmdline = "<...>"; |
| 541 | unsigned map; |
| 542 | |
| 543 | if (!pid) |
| 544 | return "<idle>"; |
| 545 | |
| 546 | if (pid > PID_MAX_DEFAULT) |
| 547 | goto out; |
| 548 | |
| 549 | map = map_pid_to_cmdline[pid]; |
| 550 | if (map >= SAVED_CMDLINES) |
| 551 | goto out; |
| 552 | |
| 553 | cmdline = saved_cmdlines[map]; |
| 554 | |
| 555 | out: |
| 556 | return cmdline; |
| 557 | } |
| 558 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 559 | void tracing_record_cmdline(struct task_struct *tsk) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 560 | { |
| 561 | if (atomic_read(&trace_record_cmdline_disabled)) |
| 562 | return; |
| 563 | |
| 564 | trace_save_cmdline(tsk); |
| 565 | } |
| 566 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 567 | static inline struct list_head * |
Steven Rostedt | 93a588f | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 568 | trace_next_list(struct trace_array_cpu *data, struct list_head *next) |
| 569 | { |
| 570 | /* |
| 571 | * Roundrobin - but skip the head (which is not a real page): |
| 572 | */ |
| 573 | next = next->next; |
| 574 | if (unlikely(next == &data->trace_pages)) |
| 575 | next = next->next; |
| 576 | BUG_ON(next == &data->trace_pages); |
| 577 | |
| 578 | return next; |
| 579 | } |
| 580 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 581 | static inline void * |
Steven Rostedt | 93a588f | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 582 | trace_next_page(struct trace_array_cpu *data, void *addr) |
| 583 | { |
| 584 | struct list_head *next; |
| 585 | struct page *page; |
| 586 | |
| 587 | page = virt_to_page(addr); |
| 588 | |
| 589 | next = trace_next_list(data, &page->lru); |
| 590 | page = list_entry(next, struct page, lru); |
| 591 | |
| 592 | return page_address(page); |
| 593 | } |
| 594 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 595 | static inline struct trace_entry * |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 596 | 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] | 597 | { |
| 598 | unsigned long idx, idx_next; |
| 599 | struct trace_entry *entry; |
| 600 | |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 601 | data->trace_idx++; |
Steven Rostedt | 93a588f | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 602 | idx = data->trace_head_idx; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 603 | idx_next = idx + 1; |
| 604 | |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 605 | BUG_ON(idx * TRACE_ENTRY_SIZE >= PAGE_SIZE); |
| 606 | |
Steven Rostedt | 93a588f | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 607 | entry = data->trace_head + idx * TRACE_ENTRY_SIZE; |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 608 | |
| 609 | if (unlikely(idx_next >= ENTRIES_PER_PAGE)) { |
Steven Rostedt | 93a588f | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 610 | data->trace_head = trace_next_page(data, data->trace_head); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 611 | idx_next = 0; |
| 612 | } |
| 613 | |
Steven Rostedt | 93a588f | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 614 | if (data->trace_head == data->trace_tail && |
| 615 | idx_next == data->trace_tail_idx) { |
| 616 | /* overrun */ |
| 617 | data->trace_tail_idx++; |
| 618 | if (data->trace_tail_idx >= ENTRIES_PER_PAGE) { |
| 619 | data->trace_tail = |
| 620 | trace_next_page(data, data->trace_tail); |
| 621 | data->trace_tail_idx = 0; |
| 622 | } |
| 623 | } |
| 624 | |
| 625 | data->trace_head_idx = idx_next; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 626 | |
| 627 | return entry; |
| 628 | } |
| 629 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 630 | static inline void |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 631 | tracing_generic_entry_update(struct trace_entry *entry, unsigned long flags) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 632 | { |
| 633 | struct task_struct *tsk = current; |
| 634 | unsigned long pc; |
| 635 | |
| 636 | pc = preempt_count(); |
| 637 | |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 638 | entry->preempt_count = pc & 0xff; |
| 639 | entry->pid = tsk->pid; |
Ingo Molnar | 750ed1a | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 640 | entry->t = ftrace_now(raw_smp_processor_id()); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 641 | entry->flags = (irqs_disabled_flags(flags) ? TRACE_FLAG_IRQS_OFF : 0) | |
| 642 | ((pc & HARDIRQ_MASK) ? TRACE_FLAG_HARDIRQ : 0) | |
| 643 | ((pc & SOFTIRQ_MASK) ? TRACE_FLAG_SOFTIRQ : 0) | |
| 644 | (need_resched() ? TRACE_FLAG_NEED_RESCHED : 0); |
| 645 | } |
| 646 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 647 | void |
Steven Rostedt | 6fb44b7 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 648 | trace_function(struct trace_array *tr, struct trace_array_cpu *data, |
| 649 | unsigned long ip, unsigned long parent_ip, unsigned long flags) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 650 | { |
| 651 | struct trace_entry *entry; |
Ingo Molnar | dcb6308 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 652 | unsigned long irq_flags; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 653 | |
Ingo Molnar | dcb6308 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 654 | spin_lock_irqsave(&data->lock, irq_flags); |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 655 | entry = tracing_get_trace_entry(tr, data); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 656 | tracing_generic_entry_update(entry, flags); |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 657 | entry->type = TRACE_FN; |
| 658 | entry->fn.ip = ip; |
| 659 | entry->fn.parent_ip = parent_ip; |
Ingo Molnar | dcb6308 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 660 | spin_unlock_irqrestore(&data->lock, irq_flags); |
Ingo Molnar | 017730c | 2008-05-12 21:20:52 +0200 | [diff] [blame^] | 661 | |
| 662 | trace_wake_up(); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 663 | } |
| 664 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 665 | void |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 666 | ftrace(struct trace_array *tr, struct trace_array_cpu *data, |
| 667 | unsigned long ip, unsigned long parent_ip, unsigned long flags) |
| 668 | { |
| 669 | if (likely(!atomic_read(&data->disabled))) |
Steven Rostedt | 6fb44b7 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 670 | trace_function(tr, data, ip, parent_ip, flags); |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 671 | } |
| 672 | |
Ingo Molnar | 4e65551 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 673 | #ifdef CONFIG_CONTEXT_SWITCH_TRACER |
| 674 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 675 | void |
Ingo Molnar | 4e65551 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 676 | __trace_special(void *__tr, void *__data, |
| 677 | unsigned long arg1, unsigned long arg2, unsigned long arg3) |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 678 | { |
Ingo Molnar | 4e65551 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 679 | struct trace_array_cpu *data = __data; |
| 680 | struct trace_array *tr = __tr; |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 681 | struct trace_entry *entry; |
Ingo Molnar | dcb6308 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 682 | unsigned long irq_flags; |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 683 | |
Ingo Molnar | dcb6308 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 684 | spin_lock_irqsave(&data->lock, irq_flags); |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 685 | entry = tracing_get_trace_entry(tr, data); |
| 686 | tracing_generic_entry_update(entry, 0); |
| 687 | entry->type = TRACE_SPECIAL; |
| 688 | entry->special.arg1 = arg1; |
| 689 | entry->special.arg2 = arg2; |
| 690 | entry->special.arg3 = arg3; |
Ingo Molnar | dcb6308 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 691 | spin_unlock_irqrestore(&data->lock, irq_flags); |
Ingo Molnar | 017730c | 2008-05-12 21:20:52 +0200 | [diff] [blame^] | 692 | |
| 693 | trace_wake_up(); |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 694 | } |
| 695 | |
Ingo Molnar | 4e65551 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 696 | #endif |
| 697 | |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 698 | void __trace_stack(struct trace_array *tr, |
| 699 | struct trace_array_cpu *data, |
| 700 | unsigned long flags, |
| 701 | int skip) |
| 702 | { |
| 703 | struct trace_entry *entry; |
| 704 | struct stack_trace trace; |
| 705 | |
| 706 | if (!(trace_flags & TRACE_ITER_STACKTRACE)) |
| 707 | return; |
| 708 | |
| 709 | entry = tracing_get_trace_entry(tr, data); |
| 710 | tracing_generic_entry_update(entry, flags); |
| 711 | entry->type = TRACE_STACK; |
| 712 | |
| 713 | memset(&entry->stack, 0, sizeof(entry->stack)); |
| 714 | |
| 715 | trace.nr_entries = 0; |
| 716 | trace.max_entries = FTRACE_STACK_ENTRIES; |
| 717 | trace.skip = skip; |
| 718 | trace.entries = entry->stack.caller; |
| 719 | |
| 720 | save_stack_trace(&trace); |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 721 | } |
| 722 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 723 | void |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 724 | tracing_sched_switch_trace(struct trace_array *tr, |
| 725 | struct trace_array_cpu *data, |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 726 | struct task_struct *prev, |
| 727 | struct task_struct *next, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 728 | unsigned long flags) |
| 729 | { |
| 730 | struct trace_entry *entry; |
Ingo Molnar | dcb6308 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 731 | unsigned long irq_flags; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 732 | |
Ingo Molnar | dcb6308 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 733 | spin_lock_irqsave(&data->lock, irq_flags); |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 734 | entry = tracing_get_trace_entry(tr, data); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 735 | tracing_generic_entry_update(entry, flags); |
| 736 | entry->type = TRACE_CTX; |
| 737 | entry->ctx.prev_pid = prev->pid; |
| 738 | entry->ctx.prev_prio = prev->prio; |
| 739 | entry->ctx.prev_state = prev->state; |
| 740 | entry->ctx.next_pid = next->pid; |
| 741 | entry->ctx.next_prio = next->prio; |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 742 | __trace_stack(tr, data, flags, 4); |
Ingo Molnar | dcb6308 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 743 | spin_unlock_irqrestore(&data->lock, irq_flags); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 744 | } |
| 745 | |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 746 | void |
| 747 | tracing_sched_wakeup_trace(struct trace_array *tr, |
| 748 | struct trace_array_cpu *data, |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 749 | struct task_struct *wakee, |
| 750 | struct task_struct *curr, |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 751 | unsigned long flags) |
| 752 | { |
| 753 | struct trace_entry *entry; |
| 754 | unsigned long irq_flags; |
| 755 | |
| 756 | spin_lock_irqsave(&data->lock, irq_flags); |
| 757 | entry = tracing_get_trace_entry(tr, data); |
| 758 | tracing_generic_entry_update(entry, flags); |
| 759 | entry->type = TRACE_WAKE; |
| 760 | entry->ctx.prev_pid = curr->pid; |
| 761 | entry->ctx.prev_prio = curr->prio; |
| 762 | entry->ctx.prev_state = curr->state; |
| 763 | entry->ctx.next_pid = wakee->pid; |
| 764 | entry->ctx.next_prio = wakee->prio; |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 765 | __trace_stack(tr, data, flags, 5); |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 766 | spin_unlock_irqrestore(&data->lock, irq_flags); |
Ingo Molnar | 017730c | 2008-05-12 21:20:52 +0200 | [diff] [blame^] | 767 | |
| 768 | trace_wake_up(); |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 769 | } |
| 770 | |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 771 | #ifdef CONFIG_FTRACE |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 772 | static void |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 773 | function_trace_call(unsigned long ip, unsigned long parent_ip) |
| 774 | { |
| 775 | struct trace_array *tr = &global_trace; |
| 776 | struct trace_array_cpu *data; |
| 777 | unsigned long flags; |
| 778 | long disabled; |
| 779 | int cpu; |
| 780 | |
| 781 | if (unlikely(!tracer_enabled)) |
| 782 | return; |
| 783 | |
| 784 | local_irq_save(flags); |
| 785 | cpu = raw_smp_processor_id(); |
| 786 | data = tr->data[cpu]; |
| 787 | disabled = atomic_inc_return(&data->disabled); |
| 788 | |
| 789 | if (likely(disabled == 1)) |
Steven Rostedt | 6fb44b7 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 790 | trace_function(tr, data, ip, parent_ip, flags); |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 791 | |
| 792 | atomic_dec(&data->disabled); |
| 793 | local_irq_restore(flags); |
| 794 | } |
| 795 | |
| 796 | static struct ftrace_ops trace_ops __read_mostly = |
| 797 | { |
| 798 | .func = function_trace_call, |
| 799 | }; |
| 800 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 801 | void tracing_start_function_trace(void) |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 802 | { |
| 803 | register_ftrace_function(&trace_ops); |
| 804 | } |
| 805 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 806 | void tracing_stop_function_trace(void) |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 807 | { |
| 808 | unregister_ftrace_function(&trace_ops); |
| 809 | } |
| 810 | #endif |
| 811 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 812 | enum trace_file_type { |
| 813 | TRACE_FILE_LAT_FMT = 1, |
| 814 | }; |
| 815 | |
| 816 | static struct trace_entry * |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 817 | trace_entry_idx(struct trace_array *tr, struct trace_array_cpu *data, |
| 818 | struct trace_iterator *iter, int cpu) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 819 | { |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 820 | struct page *page; |
| 821 | struct trace_entry *array; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 822 | |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 823 | if (iter->next_idx[cpu] >= tr->entries || |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 824 | iter->next_idx[cpu] >= data->trace_idx || |
| 825 | (data->trace_head == data->trace_tail && |
| 826 | data->trace_head_idx == data->trace_tail_idx)) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 827 | return NULL; |
| 828 | |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 829 | if (!iter->next_page[cpu]) { |
Steven Rostedt | 93a588f | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 830 | /* Initialize the iterator for this cpu trace buffer */ |
| 831 | WARN_ON(!data->trace_tail); |
| 832 | page = virt_to_page(data->trace_tail); |
| 833 | iter->next_page[cpu] = &page->lru; |
| 834 | iter->next_page_idx[cpu] = data->trace_tail_idx; |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 835 | } |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 836 | |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 837 | page = list_entry(iter->next_page[cpu], struct page, lru); |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 838 | BUG_ON(&data->trace_pages == &page->lru); |
| 839 | |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 840 | array = page_address(page); |
| 841 | |
Steven Rostedt | 93a588f | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 842 | WARN_ON(iter->next_page_idx[cpu] >= ENTRIES_PER_PAGE); |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 843 | return &array[iter->next_page_idx[cpu]]; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 844 | } |
| 845 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 846 | static struct trace_entry * |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 847 | find_next_entry(struct trace_iterator *iter, int *ent_cpu) |
| 848 | { |
| 849 | struct trace_array *tr = iter->tr; |
| 850 | struct trace_entry *ent, *next = NULL; |
| 851 | int next_cpu = -1; |
| 852 | int cpu; |
| 853 | |
| 854 | for_each_possible_cpu(cpu) { |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 855 | if (!head_page(tr->data[cpu])) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 856 | continue; |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 857 | ent = trace_entry_idx(tr, tr->data[cpu], iter, cpu); |
Ingo Molnar | cdd31cd | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 858 | /* |
| 859 | * Pick the entry with the smallest timestamp: |
| 860 | */ |
| 861 | if (ent && (!next || ent->t < next->t)) { |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 862 | next = ent; |
| 863 | next_cpu = cpu; |
| 864 | } |
| 865 | } |
| 866 | |
| 867 | if (ent_cpu) |
| 868 | *ent_cpu = next_cpu; |
| 869 | |
| 870 | return next; |
| 871 | } |
| 872 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 873 | static void trace_iterator_increment(struct trace_iterator *iter) |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 874 | { |
| 875 | iter->idx++; |
| 876 | iter->next_idx[iter->cpu]++; |
| 877 | iter->next_page_idx[iter->cpu]++; |
Ingo Molnar | 8c523a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 878 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 879 | if (iter->next_page_idx[iter->cpu] >= ENTRIES_PER_PAGE) { |
| 880 | struct trace_array_cpu *data = iter->tr->data[iter->cpu]; |
| 881 | |
| 882 | iter->next_page_idx[iter->cpu] = 0; |
| 883 | iter->next_page[iter->cpu] = |
| 884 | trace_next_list(data, iter->next_page[iter->cpu]); |
| 885 | } |
| 886 | } |
| 887 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 888 | static void trace_consume(struct trace_iterator *iter) |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 889 | { |
| 890 | struct trace_array_cpu *data = iter->tr->data[iter->cpu]; |
| 891 | |
| 892 | data->trace_tail_idx++; |
| 893 | if (data->trace_tail_idx >= ENTRIES_PER_PAGE) { |
| 894 | data->trace_tail = trace_next_page(data, data->trace_tail); |
| 895 | data->trace_tail_idx = 0; |
| 896 | } |
| 897 | |
| 898 | /* Check if we empty it, then reset the index */ |
| 899 | if (data->trace_head == data->trace_tail && |
| 900 | data->trace_head_idx == data->trace_tail_idx) |
| 901 | data->trace_idx = 0; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 902 | } |
| 903 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 904 | static void *find_next_entry_inc(struct trace_iterator *iter) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 905 | { |
| 906 | struct trace_entry *next; |
| 907 | int next_cpu = -1; |
| 908 | |
| 909 | next = find_next_entry(iter, &next_cpu); |
| 910 | |
Ingo Molnar | 4e3c333 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 911 | iter->prev_ent = iter->ent; |
| 912 | iter->prev_cpu = iter->cpu; |
| 913 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 914 | iter->ent = next; |
| 915 | iter->cpu = next_cpu; |
| 916 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 917 | if (next) |
| 918 | trace_iterator_increment(iter); |
| 919 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 920 | return next ? iter : NULL; |
| 921 | } |
| 922 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 923 | 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] | 924 | { |
| 925 | struct trace_iterator *iter = m->private; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 926 | void *last_ent = iter->ent; |
| 927 | int i = (int)*pos; |
Ingo Molnar | 4e3c333 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 928 | void *ent; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 929 | |
| 930 | (*pos)++; |
| 931 | |
| 932 | /* can't go backwards */ |
| 933 | if (iter->idx > i) |
| 934 | return NULL; |
| 935 | |
| 936 | if (iter->idx < 0) |
| 937 | ent = find_next_entry_inc(iter); |
| 938 | else |
| 939 | ent = iter; |
| 940 | |
| 941 | while (ent && iter->idx < i) |
| 942 | ent = find_next_entry_inc(iter); |
| 943 | |
| 944 | iter->pos = *pos; |
| 945 | |
| 946 | if (last_ent && !ent) |
| 947 | seq_puts(m, "\n\nvim:ft=help\n"); |
| 948 | |
| 949 | return ent; |
| 950 | } |
| 951 | |
| 952 | static void *s_start(struct seq_file *m, loff_t *pos) |
| 953 | { |
| 954 | struct trace_iterator *iter = m->private; |
| 955 | void *p = NULL; |
| 956 | loff_t l = 0; |
| 957 | int i; |
| 958 | |
| 959 | mutex_lock(&trace_types_lock); |
| 960 | |
| 961 | if (!current_trace || current_trace != iter->trace) |
| 962 | return NULL; |
| 963 | |
| 964 | atomic_inc(&trace_record_cmdline_disabled); |
| 965 | |
| 966 | /* let the tracer grab locks here if needed */ |
| 967 | if (current_trace->start) |
| 968 | current_trace->start(iter); |
| 969 | |
| 970 | if (*pos != iter->pos) { |
| 971 | iter->ent = NULL; |
| 972 | iter->cpu = 0; |
| 973 | iter->idx = -1; |
Ingo Molnar | 4e3c333 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 974 | iter->prev_ent = NULL; |
| 975 | iter->prev_cpu = -1; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 976 | |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 977 | for_each_possible_cpu(i) { |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 978 | iter->next_idx[i] = 0; |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 979 | iter->next_page[i] = NULL; |
| 980 | } |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 981 | |
| 982 | for (p = iter; p && l < *pos; p = s_next(m, p, &l)) |
| 983 | ; |
| 984 | |
| 985 | } else { |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 986 | l = *pos - 1; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 987 | p = s_next(m, p, &l); |
| 988 | } |
| 989 | |
| 990 | return p; |
| 991 | } |
| 992 | |
| 993 | static void s_stop(struct seq_file *m, void *p) |
| 994 | { |
| 995 | struct trace_iterator *iter = m->private; |
| 996 | |
| 997 | atomic_dec(&trace_record_cmdline_disabled); |
| 998 | |
| 999 | /* let the tracer release locks here if needed */ |
| 1000 | if (current_trace && current_trace == iter->trace && iter->trace->stop) |
| 1001 | iter->trace->stop(iter); |
| 1002 | |
| 1003 | mutex_unlock(&trace_types_lock); |
| 1004 | } |
| 1005 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1006 | static int |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1007 | 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] | 1008 | { |
| 1009 | #ifdef CONFIG_KALLSYMS |
| 1010 | char str[KSYM_SYMBOL_LEN]; |
| 1011 | |
| 1012 | kallsyms_lookup(address, NULL, NULL, NULL, str); |
| 1013 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1014 | return trace_seq_printf(s, fmt, str); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1015 | #endif |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1016 | return 1; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1017 | } |
| 1018 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1019 | static int |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1020 | seq_print_sym_offset(struct trace_seq *s, const char *fmt, |
| 1021 | unsigned long address) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1022 | { |
| 1023 | #ifdef CONFIG_KALLSYMS |
| 1024 | char str[KSYM_SYMBOL_LEN]; |
| 1025 | |
| 1026 | sprint_symbol(str, address); |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1027 | return trace_seq_printf(s, fmt, str); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1028 | #endif |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1029 | return 1; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1030 | } |
| 1031 | |
| 1032 | #ifndef CONFIG_64BIT |
| 1033 | # define IP_FMT "%08lx" |
| 1034 | #else |
| 1035 | # define IP_FMT "%016lx" |
| 1036 | #endif |
| 1037 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1038 | static int |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1039 | 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] | 1040 | { |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1041 | int ret; |
| 1042 | |
| 1043 | if (!ip) |
| 1044 | return trace_seq_printf(s, "0"); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1045 | |
| 1046 | if (sym_flags & TRACE_ITER_SYM_OFFSET) |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1047 | ret = seq_print_sym_offset(s, "%s", ip); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1048 | else |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1049 | ret = seq_print_sym_short(s, "%s", ip); |
| 1050 | |
| 1051 | if (!ret) |
| 1052 | return 0; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1053 | |
| 1054 | if (sym_flags & TRACE_ITER_SYM_ADDR) |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1055 | ret = trace_seq_printf(s, " <" IP_FMT ">", ip); |
| 1056 | return ret; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1057 | } |
| 1058 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1059 | static void print_lat_help_header(struct seq_file *m) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1060 | { |
| 1061 | seq_puts(m, "# _------=> CPU# \n"); |
| 1062 | seq_puts(m, "# / _-----=> irqs-off \n"); |
| 1063 | seq_puts(m, "# | / _----=> need-resched \n"); |
| 1064 | seq_puts(m, "# || / _---=> hardirq/softirq \n"); |
| 1065 | seq_puts(m, "# ||| / _--=> preempt-depth \n"); |
| 1066 | seq_puts(m, "# |||| / \n"); |
| 1067 | seq_puts(m, "# ||||| delay \n"); |
| 1068 | seq_puts(m, "# cmd pid ||||| time | caller \n"); |
| 1069 | seq_puts(m, "# \\ / ||||| \\ | / \n"); |
| 1070 | } |
| 1071 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1072 | static void print_func_help_header(struct seq_file *m) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1073 | { |
| 1074 | seq_puts(m, "# TASK-PID CPU# TIMESTAMP FUNCTION\n"); |
| 1075 | seq_puts(m, "# | | | | |\n"); |
| 1076 | } |
| 1077 | |
| 1078 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1079 | static void |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1080 | print_trace_header(struct seq_file *m, struct trace_iterator *iter) |
| 1081 | { |
| 1082 | unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK); |
| 1083 | struct trace_array *tr = iter->tr; |
| 1084 | struct trace_array_cpu *data = tr->data[tr->cpu]; |
| 1085 | struct tracer *type = current_trace; |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1086 | unsigned long total = 0; |
| 1087 | unsigned long entries = 0; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1088 | int cpu; |
| 1089 | const char *name = "preemption"; |
| 1090 | |
| 1091 | if (type) |
| 1092 | name = type->name; |
| 1093 | |
| 1094 | for_each_possible_cpu(cpu) { |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 1095 | if (head_page(tr->data[cpu])) { |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1096 | total += tr->data[cpu]->trace_idx; |
| 1097 | if (tr->data[cpu]->trace_idx > tr->entries) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1098 | entries += tr->entries; |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1099 | else |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1100 | entries += tr->data[cpu]->trace_idx; |
| 1101 | } |
| 1102 | } |
| 1103 | |
| 1104 | seq_printf(m, "%s latency trace v1.1.5 on %s\n", |
| 1105 | name, UTS_RELEASE); |
| 1106 | seq_puts(m, "-----------------------------------" |
| 1107 | "---------------------------------\n"); |
| 1108 | seq_printf(m, " latency: %lu us, #%lu/%lu, CPU#%d |" |
| 1109 | " (M:%s VP:%d, KP:%d, SP:%d HP:%d", |
Steven Rostedt | 57f50be | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 1110 | nsecs_to_usecs(data->saved_latency), |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1111 | entries, |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1112 | total, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1113 | tr->cpu, |
| 1114 | #if defined(CONFIG_PREEMPT_NONE) |
| 1115 | "server", |
| 1116 | #elif defined(CONFIG_PREEMPT_VOLUNTARY) |
| 1117 | "desktop", |
| 1118 | #elif defined(CONFIG_PREEMPT_DESKTOP) |
| 1119 | "preempt", |
| 1120 | #else |
| 1121 | "unknown", |
| 1122 | #endif |
| 1123 | /* These are reserved for later use */ |
| 1124 | 0, 0, 0, 0); |
| 1125 | #ifdef CONFIG_SMP |
| 1126 | seq_printf(m, " #P:%d)\n", num_online_cpus()); |
| 1127 | #else |
| 1128 | seq_puts(m, ")\n"); |
| 1129 | #endif |
| 1130 | seq_puts(m, " -----------------\n"); |
| 1131 | seq_printf(m, " | task: %.16s-%d " |
| 1132 | "(uid:%d nice:%ld policy:%ld rt_prio:%ld)\n", |
| 1133 | data->comm, data->pid, data->uid, data->nice, |
| 1134 | data->policy, data->rt_priority); |
| 1135 | seq_puts(m, " -----------------\n"); |
| 1136 | |
| 1137 | if (data->critical_start) { |
| 1138 | seq_puts(m, " => started at: "); |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1139 | seq_print_ip_sym(&iter->seq, data->critical_start, sym_flags); |
| 1140 | trace_print_seq(m, &iter->seq); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1141 | seq_puts(m, "\n => ended at: "); |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1142 | seq_print_ip_sym(&iter->seq, data->critical_end, sym_flags); |
| 1143 | trace_print_seq(m, &iter->seq); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1144 | seq_puts(m, "\n"); |
| 1145 | } |
| 1146 | |
| 1147 | seq_puts(m, "\n"); |
| 1148 | } |
| 1149 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1150 | static void |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1151 | 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] | 1152 | { |
| 1153 | int hardirq, softirq; |
| 1154 | char *comm; |
| 1155 | |
| 1156 | comm = trace_find_cmdline(entry->pid); |
| 1157 | |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1158 | trace_seq_printf(s, "%8.8s-%-5d ", comm, entry->pid); |
| 1159 | trace_seq_printf(s, "%d", cpu); |
| 1160 | trace_seq_printf(s, "%c%c", |
| 1161 | (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' : '.', |
| 1162 | ((entry->flags & TRACE_FLAG_NEED_RESCHED) ? 'N' : '.')); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1163 | |
| 1164 | hardirq = entry->flags & TRACE_FLAG_HARDIRQ; |
| 1165 | softirq = entry->flags & TRACE_FLAG_SOFTIRQ; |
| 1166 | if (hardirq && softirq) |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1167 | trace_seq_putc(s, 'H'); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1168 | else { |
| 1169 | if (hardirq) |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1170 | trace_seq_putc(s, 'h'); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1171 | else { |
| 1172 | if (softirq) |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1173 | trace_seq_putc(s, 's'); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1174 | else |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1175 | trace_seq_putc(s, '.'); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1176 | } |
| 1177 | } |
| 1178 | |
| 1179 | if (entry->preempt_count) |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1180 | trace_seq_printf(s, "%x", entry->preempt_count); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1181 | else |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1182 | trace_seq_puts(s, "."); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1183 | } |
| 1184 | |
| 1185 | unsigned long preempt_mark_thresh = 100; |
| 1186 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1187 | static void |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1188 | lat_print_timestamp(struct trace_seq *s, unsigned long long abs_usecs, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1189 | unsigned long rel_usecs) |
| 1190 | { |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1191 | trace_seq_printf(s, " %4lldus", abs_usecs); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1192 | if (rel_usecs > preempt_mark_thresh) |
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 | else if (rel_usecs > 1) |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1195 | trace_seq_puts(s, "+: "); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1196 | else |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1197 | trace_seq_puts(s, " : "); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1198 | } |
| 1199 | |
| 1200 | static const char state_to_char[] = TASK_STATE_TO_CHAR_STR; |
| 1201 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1202 | static int |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1203 | 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] | 1204 | { |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1205 | struct trace_seq *s = &iter->seq; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1206 | unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK); |
| 1207 | struct trace_entry *next_entry = find_next_entry(iter, NULL); |
| 1208 | unsigned long verbose = (trace_flags & TRACE_ITER_VERBOSE); |
| 1209 | struct trace_entry *entry = iter->ent; |
| 1210 | unsigned long abs_usecs; |
| 1211 | unsigned long rel_usecs; |
| 1212 | char *comm; |
| 1213 | int S; |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1214 | int i; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1215 | |
| 1216 | if (!next_entry) |
| 1217 | next_entry = entry; |
| 1218 | rel_usecs = ns2usecs(next_entry->t - entry->t); |
| 1219 | abs_usecs = ns2usecs(entry->t - iter->tr->time_start); |
| 1220 | |
| 1221 | if (verbose) { |
| 1222 | comm = trace_find_cmdline(entry->pid); |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1223 | trace_seq_printf(s, "%16s %5d %d %d %08x %08x [%08lx]" |
| 1224 | " %ld.%03ldms (+%ld.%03ldms): ", |
| 1225 | comm, |
| 1226 | entry->pid, cpu, entry->flags, |
| 1227 | entry->preempt_count, trace_idx, |
| 1228 | ns2usecs(entry->t), |
| 1229 | abs_usecs/1000, |
| 1230 | abs_usecs % 1000, rel_usecs/1000, |
| 1231 | rel_usecs % 1000); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1232 | } else { |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1233 | if (entry->type != TRACE_STACK) { |
| 1234 | lat_print_generic(s, entry, cpu); |
| 1235 | lat_print_timestamp(s, abs_usecs, rel_usecs); |
| 1236 | } |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1237 | } |
| 1238 | switch (entry->type) { |
| 1239 | case TRACE_FN: |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1240 | seq_print_ip_sym(s, entry->fn.ip, sym_flags); |
| 1241 | trace_seq_puts(s, " ("); |
| 1242 | seq_print_ip_sym(s, entry->fn.parent_ip, sym_flags); |
| 1243 | trace_seq_puts(s, ")\n"); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1244 | break; |
| 1245 | case TRACE_CTX: |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1246 | case TRACE_WAKE: |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1247 | S = entry->ctx.prev_state < sizeof(state_to_char) ? |
| 1248 | state_to_char[entry->ctx.prev_state] : 'X'; |
| 1249 | comm = trace_find_cmdline(entry->ctx.next_pid); |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1250 | trace_seq_printf(s, " %5d:%3d:%c %s %5d:%3d %s\n", |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1251 | entry->ctx.prev_pid, |
| 1252 | entry->ctx.prev_prio, |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1253 | S, entry->type == TRACE_CTX ? "==>" : " +", |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1254 | entry->ctx.next_pid, |
| 1255 | entry->ctx.next_prio, |
| 1256 | comm); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1257 | break; |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1258 | case TRACE_SPECIAL: |
Ingo Molnar | 4e65551 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 1259 | trace_seq_printf(s, " %ld %ld %ld\n", |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1260 | entry->special.arg1, |
| 1261 | entry->special.arg2, |
| 1262 | entry->special.arg3); |
| 1263 | break; |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1264 | case TRACE_STACK: |
| 1265 | for (i = 0; i < FTRACE_STACK_ENTRIES; i++) { |
| 1266 | if (i) |
| 1267 | trace_seq_puts(s, " <= "); |
| 1268 | seq_print_ip_sym(s, entry->stack.caller[i], sym_flags); |
| 1269 | } |
| 1270 | trace_seq_puts(s, "\n"); |
| 1271 | break; |
Steven Rostedt | 89b2f97 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 1272 | default: |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1273 | trace_seq_printf(s, "Unknown type %d\n", entry->type); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1274 | } |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1275 | return 1; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1276 | } |
| 1277 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1278 | static int print_trace_fmt(struct trace_iterator *iter) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1279 | { |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1280 | struct trace_seq *s = &iter->seq; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1281 | unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK); |
Ingo Molnar | 4e3c333 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 1282 | struct trace_entry *entry; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1283 | unsigned long usec_rem; |
| 1284 | unsigned long long t; |
| 1285 | unsigned long secs; |
| 1286 | char *comm; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1287 | int ret; |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1288 | int S; |
| 1289 | int i; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1290 | |
Ingo Molnar | 4e3c333 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 1291 | entry = iter->ent; |
| 1292 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1293 | comm = trace_find_cmdline(iter->ent->pid); |
| 1294 | |
Ingo Molnar | cdd31cd | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1295 | t = ns2usecs(entry->t); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1296 | usec_rem = do_div(t, 1000000ULL); |
| 1297 | secs = (unsigned long)t; |
| 1298 | |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1299 | if (entry->type != TRACE_STACK) { |
| 1300 | ret = trace_seq_printf(s, "%16s-%-5d ", comm, entry->pid); |
| 1301 | if (!ret) |
| 1302 | return 0; |
| 1303 | ret = trace_seq_printf(s, "[%02d] ", iter->cpu); |
| 1304 | if (!ret) |
| 1305 | return 0; |
| 1306 | ret = trace_seq_printf(s, "%5lu.%06lu: ", secs, usec_rem); |
| 1307 | if (!ret) |
| 1308 | return 0; |
| 1309 | } |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1310 | |
| 1311 | switch (entry->type) { |
| 1312 | case TRACE_FN: |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1313 | ret = seq_print_ip_sym(s, entry->fn.ip, sym_flags); |
| 1314 | if (!ret) |
| 1315 | return 0; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1316 | if ((sym_flags & TRACE_ITER_PRINT_PARENT) && |
| 1317 | entry->fn.parent_ip) { |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1318 | ret = trace_seq_printf(s, " <-"); |
| 1319 | if (!ret) |
| 1320 | return 0; |
| 1321 | ret = seq_print_ip_sym(s, entry->fn.parent_ip, |
| 1322 | sym_flags); |
| 1323 | if (!ret) |
| 1324 | return 0; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1325 | } |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1326 | ret = trace_seq_printf(s, "\n"); |
| 1327 | if (!ret) |
| 1328 | return 0; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1329 | break; |
| 1330 | case TRACE_CTX: |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1331 | case TRACE_WAKE: |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1332 | S = entry->ctx.prev_state < sizeof(state_to_char) ? |
| 1333 | state_to_char[entry->ctx.prev_state] : 'X'; |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1334 | ret = trace_seq_printf(s, " %5d:%3d:%c %s %5d:%3d\n", |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1335 | entry->ctx.prev_pid, |
| 1336 | entry->ctx.prev_prio, |
| 1337 | S, |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1338 | entry->type == TRACE_CTX ? "==>" : " +", |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1339 | entry->ctx.next_pid, |
| 1340 | entry->ctx.next_prio); |
| 1341 | if (!ret) |
| 1342 | return 0; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1343 | break; |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1344 | case TRACE_SPECIAL: |
Ingo Molnar | 4e65551 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 1345 | ret = trace_seq_printf(s, " %ld %ld %ld\n", |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1346 | entry->special.arg1, |
| 1347 | entry->special.arg2, |
| 1348 | entry->special.arg3); |
| 1349 | if (!ret) |
| 1350 | return 0; |
| 1351 | break; |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1352 | case TRACE_STACK: |
| 1353 | for (i = 0; i < FTRACE_STACK_ENTRIES; i++) { |
| 1354 | if (i) { |
| 1355 | ret = trace_seq_puts(s, " <= "); |
| 1356 | if (!ret) |
| 1357 | return 0; |
| 1358 | } |
| 1359 | ret = seq_print_ip_sym(s, entry->stack.caller[i], |
| 1360 | sym_flags); |
| 1361 | if (!ret) |
| 1362 | return 0; |
| 1363 | } |
| 1364 | ret = trace_seq_puts(s, "\n"); |
| 1365 | if (!ret) |
| 1366 | return 0; |
| 1367 | break; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1368 | } |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1369 | return 1; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1370 | } |
| 1371 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1372 | static int print_raw_fmt(struct trace_iterator *iter) |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1373 | { |
| 1374 | struct trace_seq *s = &iter->seq; |
| 1375 | struct trace_entry *entry; |
| 1376 | int ret; |
| 1377 | int S; |
| 1378 | |
| 1379 | entry = iter->ent; |
| 1380 | |
| 1381 | ret = trace_seq_printf(s, "%d %d %llu ", |
| 1382 | entry->pid, iter->cpu, entry->t); |
| 1383 | if (!ret) |
| 1384 | return 0; |
| 1385 | |
| 1386 | switch (entry->type) { |
| 1387 | case TRACE_FN: |
| 1388 | ret = trace_seq_printf(s, "%x %x\n", |
| 1389 | entry->fn.ip, entry->fn.parent_ip); |
| 1390 | if (!ret) |
| 1391 | return 0; |
| 1392 | break; |
| 1393 | case TRACE_CTX: |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1394 | case TRACE_WAKE: |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1395 | S = entry->ctx.prev_state < sizeof(state_to_char) ? |
| 1396 | state_to_char[entry->ctx.prev_state] : 'X'; |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1397 | if (entry->type == TRACE_WAKE) |
| 1398 | S = '+'; |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1399 | ret = trace_seq_printf(s, "%d %d %c %d %d\n", |
| 1400 | entry->ctx.prev_pid, |
| 1401 | entry->ctx.prev_prio, |
| 1402 | S, |
| 1403 | entry->ctx.next_pid, |
| 1404 | entry->ctx.next_prio); |
| 1405 | if (!ret) |
| 1406 | return 0; |
| 1407 | break; |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1408 | case TRACE_SPECIAL: |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1409 | case TRACE_STACK: |
Ingo Molnar | 4e65551 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 1410 | ret = trace_seq_printf(s, " %ld %ld %ld\n", |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1411 | entry->special.arg1, |
| 1412 | entry->special.arg2, |
| 1413 | entry->special.arg3); |
| 1414 | if (!ret) |
| 1415 | return 0; |
| 1416 | break; |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1417 | } |
| 1418 | return 1; |
| 1419 | } |
| 1420 | |
Ingo Molnar | cb0f12a | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1421 | #define SEQ_PUT_FIELD_RET(s, x) \ |
| 1422 | do { \ |
| 1423 | if (!trace_seq_putmem(s, &(x), sizeof(x))) \ |
| 1424 | return 0; \ |
| 1425 | } while (0) |
| 1426 | |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1427 | #define SEQ_PUT_HEX_FIELD_RET(s, x) \ |
| 1428 | do { \ |
| 1429 | if (!trace_seq_putmem_hex(s, &(x), sizeof(x))) \ |
| 1430 | return 0; \ |
| 1431 | } while (0) |
| 1432 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1433 | static int print_hex_fmt(struct trace_iterator *iter) |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1434 | { |
| 1435 | struct trace_seq *s = &iter->seq; |
| 1436 | unsigned char newline = '\n'; |
| 1437 | struct trace_entry *entry; |
| 1438 | int S; |
| 1439 | |
| 1440 | entry = iter->ent; |
| 1441 | |
| 1442 | SEQ_PUT_HEX_FIELD_RET(s, entry->pid); |
| 1443 | SEQ_PUT_HEX_FIELD_RET(s, iter->cpu); |
| 1444 | SEQ_PUT_HEX_FIELD_RET(s, entry->t); |
| 1445 | |
| 1446 | switch (entry->type) { |
| 1447 | case TRACE_FN: |
| 1448 | SEQ_PUT_HEX_FIELD_RET(s, entry->fn.ip); |
| 1449 | SEQ_PUT_HEX_FIELD_RET(s, entry->fn.parent_ip); |
| 1450 | break; |
| 1451 | case TRACE_CTX: |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1452 | case TRACE_WAKE: |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1453 | S = entry->ctx.prev_state < sizeof(state_to_char) ? |
| 1454 | state_to_char[entry->ctx.prev_state] : 'X'; |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1455 | if (entry->type == TRACE_WAKE) |
| 1456 | S = '+'; |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1457 | SEQ_PUT_HEX_FIELD_RET(s, entry->ctx.prev_pid); |
| 1458 | SEQ_PUT_HEX_FIELD_RET(s, entry->ctx.prev_prio); |
| 1459 | SEQ_PUT_HEX_FIELD_RET(s, S); |
| 1460 | SEQ_PUT_HEX_FIELD_RET(s, entry->ctx.next_pid); |
| 1461 | SEQ_PUT_HEX_FIELD_RET(s, entry->ctx.next_prio); |
| 1462 | SEQ_PUT_HEX_FIELD_RET(s, entry->fn.parent_ip); |
| 1463 | break; |
| 1464 | case TRACE_SPECIAL: |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1465 | case TRACE_STACK: |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1466 | SEQ_PUT_HEX_FIELD_RET(s, entry->special.arg1); |
| 1467 | SEQ_PUT_HEX_FIELD_RET(s, entry->special.arg2); |
| 1468 | SEQ_PUT_HEX_FIELD_RET(s, entry->special.arg3); |
| 1469 | break; |
| 1470 | } |
| 1471 | SEQ_PUT_FIELD_RET(s, newline); |
| 1472 | |
| 1473 | return 1; |
| 1474 | } |
| 1475 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1476 | static int print_bin_fmt(struct trace_iterator *iter) |
Ingo Molnar | cb0f12a | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1477 | { |
| 1478 | struct trace_seq *s = &iter->seq; |
| 1479 | struct trace_entry *entry; |
| 1480 | |
| 1481 | entry = iter->ent; |
| 1482 | |
| 1483 | SEQ_PUT_FIELD_RET(s, entry->pid); |
| 1484 | SEQ_PUT_FIELD_RET(s, entry->cpu); |
| 1485 | SEQ_PUT_FIELD_RET(s, entry->t); |
| 1486 | |
| 1487 | switch (entry->type) { |
| 1488 | case TRACE_FN: |
| 1489 | SEQ_PUT_FIELD_RET(s, entry->fn.ip); |
| 1490 | SEQ_PUT_FIELD_RET(s, entry->fn.parent_ip); |
| 1491 | break; |
| 1492 | case TRACE_CTX: |
| 1493 | SEQ_PUT_FIELD_RET(s, entry->ctx.prev_pid); |
| 1494 | SEQ_PUT_FIELD_RET(s, entry->ctx.prev_prio); |
| 1495 | SEQ_PUT_FIELD_RET(s, entry->ctx.prev_state); |
| 1496 | SEQ_PUT_FIELD_RET(s, entry->ctx.next_pid); |
| 1497 | SEQ_PUT_FIELD_RET(s, entry->ctx.next_prio); |
| 1498 | break; |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1499 | case TRACE_SPECIAL: |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1500 | case TRACE_STACK: |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1501 | SEQ_PUT_FIELD_RET(s, entry->special.arg1); |
| 1502 | SEQ_PUT_FIELD_RET(s, entry->special.arg2); |
| 1503 | SEQ_PUT_FIELD_RET(s, entry->special.arg3); |
| 1504 | break; |
Ingo Molnar | cb0f12a | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1505 | } |
| 1506 | return 1; |
| 1507 | } |
| 1508 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1509 | static int trace_empty(struct trace_iterator *iter) |
| 1510 | { |
| 1511 | struct trace_array_cpu *data; |
| 1512 | int cpu; |
| 1513 | |
| 1514 | for_each_possible_cpu(cpu) { |
| 1515 | data = iter->tr->data[cpu]; |
| 1516 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1517 | if (head_page(data) && data->trace_idx && |
| 1518 | (data->trace_tail != data->trace_head || |
| 1519 | data->trace_tail_idx != data->trace_head_idx)) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1520 | return 0; |
| 1521 | } |
| 1522 | return 1; |
| 1523 | } |
| 1524 | |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1525 | static int print_trace_line(struct trace_iterator *iter) |
| 1526 | { |
Ingo Molnar | cb0f12a | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1527 | if (trace_flags & TRACE_ITER_BIN) |
| 1528 | return print_bin_fmt(iter); |
| 1529 | |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1530 | if (trace_flags & TRACE_ITER_HEX) |
| 1531 | return print_hex_fmt(iter); |
| 1532 | |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1533 | if (trace_flags & TRACE_ITER_RAW) |
| 1534 | return print_raw_fmt(iter); |
| 1535 | |
| 1536 | if (iter->iter_flags & TRACE_FILE_LAT_FMT) |
| 1537 | return print_lat_fmt(iter, iter->idx, iter->cpu); |
| 1538 | |
| 1539 | return print_trace_fmt(iter); |
| 1540 | } |
| 1541 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1542 | static int s_show(struct seq_file *m, void *v) |
| 1543 | { |
| 1544 | struct trace_iterator *iter = v; |
| 1545 | |
| 1546 | if (iter->ent == NULL) { |
| 1547 | if (iter->tr) { |
| 1548 | seq_printf(m, "# tracer: %s\n", iter->trace->name); |
| 1549 | seq_puts(m, "#\n"); |
| 1550 | } |
| 1551 | if (iter->iter_flags & TRACE_FILE_LAT_FMT) { |
| 1552 | /* print nothing if the buffers are empty */ |
| 1553 | if (trace_empty(iter)) |
| 1554 | return 0; |
| 1555 | print_trace_header(m, iter); |
| 1556 | if (!(trace_flags & TRACE_ITER_VERBOSE)) |
| 1557 | print_lat_help_header(m); |
| 1558 | } else { |
| 1559 | if (!(trace_flags & TRACE_ITER_VERBOSE)) |
| 1560 | print_func_help_header(m); |
| 1561 | } |
| 1562 | } else { |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1563 | print_trace_line(iter); |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1564 | trace_print_seq(m, &iter->seq); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1565 | } |
| 1566 | |
| 1567 | return 0; |
| 1568 | } |
| 1569 | |
| 1570 | static struct seq_operations tracer_seq_ops = { |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1571 | .start = s_start, |
| 1572 | .next = s_next, |
| 1573 | .stop = s_stop, |
| 1574 | .show = s_show, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1575 | }; |
| 1576 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1577 | static struct trace_iterator * |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1578 | __tracing_open(struct inode *inode, struct file *file, int *ret) |
| 1579 | { |
| 1580 | struct trace_iterator *iter; |
| 1581 | |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 1582 | if (tracing_disabled) { |
| 1583 | *ret = -ENODEV; |
| 1584 | return NULL; |
| 1585 | } |
| 1586 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1587 | iter = kzalloc(sizeof(*iter), GFP_KERNEL); |
| 1588 | if (!iter) { |
| 1589 | *ret = -ENOMEM; |
| 1590 | goto out; |
| 1591 | } |
| 1592 | |
| 1593 | mutex_lock(&trace_types_lock); |
| 1594 | if (current_trace && current_trace->print_max) |
| 1595 | iter->tr = &max_tr; |
| 1596 | else |
| 1597 | iter->tr = inode->i_private; |
| 1598 | iter->trace = current_trace; |
| 1599 | iter->pos = -1; |
| 1600 | |
| 1601 | /* TODO stop tracer */ |
| 1602 | *ret = seq_open(file, &tracer_seq_ops); |
| 1603 | if (!*ret) { |
| 1604 | struct seq_file *m = file->private_data; |
| 1605 | m->private = iter; |
| 1606 | |
| 1607 | /* stop the trace while dumping */ |
| 1608 | if (iter->tr->ctrl) |
| 1609 | tracer_enabled = 0; |
| 1610 | |
| 1611 | if (iter->trace && iter->trace->open) |
| 1612 | iter->trace->open(iter); |
| 1613 | } else { |
| 1614 | kfree(iter); |
| 1615 | iter = NULL; |
| 1616 | } |
| 1617 | mutex_unlock(&trace_types_lock); |
| 1618 | |
| 1619 | out: |
| 1620 | return iter; |
| 1621 | } |
| 1622 | |
| 1623 | int tracing_open_generic(struct inode *inode, struct file *filp) |
| 1624 | { |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 1625 | if (tracing_disabled) |
| 1626 | return -ENODEV; |
| 1627 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1628 | filp->private_data = inode->i_private; |
| 1629 | return 0; |
| 1630 | } |
| 1631 | |
| 1632 | int tracing_release(struct inode *inode, struct file *file) |
| 1633 | { |
| 1634 | struct seq_file *m = (struct seq_file *)file->private_data; |
| 1635 | struct trace_iterator *iter = m->private; |
| 1636 | |
| 1637 | mutex_lock(&trace_types_lock); |
| 1638 | if (iter->trace && iter->trace->close) |
| 1639 | iter->trace->close(iter); |
| 1640 | |
| 1641 | /* reenable tracing if it was previously enabled */ |
| 1642 | if (iter->tr->ctrl) |
| 1643 | tracer_enabled = 1; |
| 1644 | mutex_unlock(&trace_types_lock); |
| 1645 | |
| 1646 | seq_release(inode, file); |
| 1647 | kfree(iter); |
| 1648 | return 0; |
| 1649 | } |
| 1650 | |
| 1651 | static int tracing_open(struct inode *inode, struct file *file) |
| 1652 | { |
| 1653 | int ret; |
| 1654 | |
| 1655 | __tracing_open(inode, file, &ret); |
| 1656 | |
| 1657 | return ret; |
| 1658 | } |
| 1659 | |
| 1660 | static int tracing_lt_open(struct inode *inode, struct file *file) |
| 1661 | { |
| 1662 | struct trace_iterator *iter; |
| 1663 | int ret; |
| 1664 | |
| 1665 | iter = __tracing_open(inode, file, &ret); |
| 1666 | |
| 1667 | if (!ret) |
| 1668 | iter->iter_flags |= TRACE_FILE_LAT_FMT; |
| 1669 | |
| 1670 | return ret; |
| 1671 | } |
| 1672 | |
| 1673 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1674 | static void * |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1675 | t_next(struct seq_file *m, void *v, loff_t *pos) |
| 1676 | { |
| 1677 | struct tracer *t = m->private; |
| 1678 | |
| 1679 | (*pos)++; |
| 1680 | |
| 1681 | if (t) |
| 1682 | t = t->next; |
| 1683 | |
| 1684 | m->private = t; |
| 1685 | |
| 1686 | return t; |
| 1687 | } |
| 1688 | |
| 1689 | static void *t_start(struct seq_file *m, loff_t *pos) |
| 1690 | { |
| 1691 | struct tracer *t = m->private; |
| 1692 | loff_t l = 0; |
| 1693 | |
| 1694 | mutex_lock(&trace_types_lock); |
| 1695 | for (; t && l < *pos; t = t_next(m, t, &l)) |
| 1696 | ; |
| 1697 | |
| 1698 | return t; |
| 1699 | } |
| 1700 | |
| 1701 | static void t_stop(struct seq_file *m, void *p) |
| 1702 | { |
| 1703 | mutex_unlock(&trace_types_lock); |
| 1704 | } |
| 1705 | |
| 1706 | static int t_show(struct seq_file *m, void *v) |
| 1707 | { |
| 1708 | struct tracer *t = v; |
| 1709 | |
| 1710 | if (!t) |
| 1711 | return 0; |
| 1712 | |
| 1713 | seq_printf(m, "%s", t->name); |
| 1714 | if (t->next) |
| 1715 | seq_putc(m, ' '); |
| 1716 | else |
| 1717 | seq_putc(m, '\n'); |
| 1718 | |
| 1719 | return 0; |
| 1720 | } |
| 1721 | |
| 1722 | static struct seq_operations show_traces_seq_ops = { |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1723 | .start = t_start, |
| 1724 | .next = t_next, |
| 1725 | .stop = t_stop, |
| 1726 | .show = t_show, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1727 | }; |
| 1728 | |
| 1729 | static int show_traces_open(struct inode *inode, struct file *file) |
| 1730 | { |
| 1731 | int ret; |
| 1732 | |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 1733 | if (tracing_disabled) |
| 1734 | return -ENODEV; |
| 1735 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1736 | ret = seq_open(file, &show_traces_seq_ops); |
| 1737 | if (!ret) { |
| 1738 | struct seq_file *m = file->private_data; |
| 1739 | m->private = trace_types; |
| 1740 | } |
| 1741 | |
| 1742 | return ret; |
| 1743 | } |
| 1744 | |
| 1745 | static struct file_operations tracing_fops = { |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1746 | .open = tracing_open, |
| 1747 | .read = seq_read, |
| 1748 | .llseek = seq_lseek, |
| 1749 | .release = tracing_release, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1750 | }; |
| 1751 | |
| 1752 | static struct file_operations tracing_lt_fops = { |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1753 | .open = tracing_lt_open, |
| 1754 | .read = seq_read, |
| 1755 | .llseek = seq_lseek, |
| 1756 | .release = tracing_release, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1757 | }; |
| 1758 | |
| 1759 | static struct file_operations show_traces_fops = { |
| 1760 | .open = show_traces_open, |
| 1761 | .read = seq_read, |
| 1762 | .release = seq_release, |
| 1763 | }; |
| 1764 | |
| 1765 | static ssize_t |
| 1766 | tracing_iter_ctrl_read(struct file *filp, char __user *ubuf, |
| 1767 | size_t cnt, loff_t *ppos) |
| 1768 | { |
| 1769 | char *buf; |
| 1770 | int r = 0; |
| 1771 | int len = 0; |
| 1772 | int i; |
| 1773 | |
| 1774 | /* calulate max size */ |
| 1775 | for (i = 0; trace_options[i]; i++) { |
| 1776 | len += strlen(trace_options[i]); |
| 1777 | len += 3; /* "no" and space */ |
| 1778 | } |
| 1779 | |
| 1780 | /* +2 for \n and \0 */ |
| 1781 | buf = kmalloc(len + 2, GFP_KERNEL); |
| 1782 | if (!buf) |
| 1783 | return -ENOMEM; |
| 1784 | |
| 1785 | for (i = 0; trace_options[i]; i++) { |
| 1786 | if (trace_flags & (1 << i)) |
| 1787 | r += sprintf(buf + r, "%s ", trace_options[i]); |
| 1788 | else |
| 1789 | r += sprintf(buf + r, "no%s ", trace_options[i]); |
| 1790 | } |
| 1791 | |
| 1792 | r += sprintf(buf + r, "\n"); |
| 1793 | WARN_ON(r >= len + 2); |
| 1794 | |
| 1795 | r = simple_read_from_buffer(ubuf, cnt, ppos, |
| 1796 | buf, r); |
| 1797 | |
| 1798 | kfree(buf); |
| 1799 | |
| 1800 | return r; |
| 1801 | } |
| 1802 | |
| 1803 | static ssize_t |
| 1804 | tracing_iter_ctrl_write(struct file *filp, const char __user *ubuf, |
| 1805 | size_t cnt, loff_t *ppos) |
| 1806 | { |
| 1807 | char buf[64]; |
| 1808 | char *cmp = buf; |
| 1809 | int neg = 0; |
| 1810 | int i; |
| 1811 | |
| 1812 | if (cnt > 63) |
| 1813 | cnt = 63; |
| 1814 | |
| 1815 | if (copy_from_user(&buf, ubuf, cnt)) |
| 1816 | return -EFAULT; |
| 1817 | |
| 1818 | buf[cnt] = 0; |
| 1819 | |
| 1820 | if (strncmp(buf, "no", 2) == 0) { |
| 1821 | neg = 1; |
| 1822 | cmp += 2; |
| 1823 | } |
| 1824 | |
| 1825 | for (i = 0; trace_options[i]; i++) { |
| 1826 | int len = strlen(trace_options[i]); |
| 1827 | |
| 1828 | if (strncmp(cmp, trace_options[i], len) == 0) { |
| 1829 | if (neg) |
| 1830 | trace_flags &= ~(1 << i); |
| 1831 | else |
| 1832 | trace_flags |= (1 << i); |
| 1833 | break; |
| 1834 | } |
| 1835 | } |
| 1836 | |
| 1837 | filp->f_pos += cnt; |
| 1838 | |
| 1839 | return cnt; |
| 1840 | } |
| 1841 | |
| 1842 | static struct file_operations tracing_iter_fops = { |
| 1843 | .open = tracing_open_generic, |
| 1844 | .read = tracing_iter_ctrl_read, |
| 1845 | .write = tracing_iter_ctrl_write, |
| 1846 | }; |
| 1847 | |
Ingo Molnar | 7bd2f24 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 1848 | static const char readme_msg[] = |
| 1849 | "tracing mini-HOWTO:\n\n" |
| 1850 | "# mkdir /debug\n" |
| 1851 | "# mount -t debugfs nodev /debug\n\n" |
| 1852 | "# cat /debug/tracing/available_tracers\n" |
| 1853 | "wakeup preemptirqsoff preemptoff irqsoff ftrace sched_switch none\n\n" |
| 1854 | "# cat /debug/tracing/current_tracer\n" |
| 1855 | "none\n" |
| 1856 | "# echo sched_switch > /debug/tracing/current_tracer\n" |
| 1857 | "# cat /debug/tracing/current_tracer\n" |
| 1858 | "sched_switch\n" |
| 1859 | "# cat /debug/tracing/iter_ctrl\n" |
| 1860 | "noprint-parent nosym-offset nosym-addr noverbose\n" |
| 1861 | "# echo print-parent > /debug/tracing/iter_ctrl\n" |
| 1862 | "# echo 1 > /debug/tracing/tracing_enabled\n" |
| 1863 | "# cat /debug/tracing/trace > /tmp/trace.txt\n" |
| 1864 | "echo 0 > /debug/tracing/tracing_enabled\n" |
| 1865 | ; |
| 1866 | |
| 1867 | static ssize_t |
| 1868 | tracing_readme_read(struct file *filp, char __user *ubuf, |
| 1869 | size_t cnt, loff_t *ppos) |
| 1870 | { |
| 1871 | return simple_read_from_buffer(ubuf, cnt, ppos, |
| 1872 | readme_msg, strlen(readme_msg)); |
| 1873 | } |
| 1874 | |
| 1875 | static struct file_operations tracing_readme_fops = { |
| 1876 | .open = tracing_open_generic, |
| 1877 | .read = tracing_readme_read, |
| 1878 | }; |
| 1879 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1880 | static ssize_t |
| 1881 | tracing_ctrl_read(struct file *filp, char __user *ubuf, |
| 1882 | size_t cnt, loff_t *ppos) |
| 1883 | { |
| 1884 | struct trace_array *tr = filp->private_data; |
| 1885 | char buf[64]; |
| 1886 | int r; |
| 1887 | |
| 1888 | r = sprintf(buf, "%ld\n", tr->ctrl); |
Ingo Molnar | 4e3c333 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 1889 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1890 | } |
| 1891 | |
| 1892 | static ssize_t |
| 1893 | tracing_ctrl_write(struct file *filp, const char __user *ubuf, |
| 1894 | size_t cnt, loff_t *ppos) |
| 1895 | { |
| 1896 | struct trace_array *tr = filp->private_data; |
| 1897 | long val; |
| 1898 | char buf[64]; |
| 1899 | |
| 1900 | if (cnt > 63) |
| 1901 | cnt = 63; |
| 1902 | |
| 1903 | if (copy_from_user(&buf, ubuf, cnt)) |
| 1904 | return -EFAULT; |
| 1905 | |
| 1906 | buf[cnt] = 0; |
| 1907 | |
| 1908 | val = simple_strtoul(buf, NULL, 10); |
| 1909 | |
| 1910 | val = !!val; |
| 1911 | |
| 1912 | mutex_lock(&trace_types_lock); |
| 1913 | if (tr->ctrl ^ val) { |
| 1914 | if (val) |
| 1915 | tracer_enabled = 1; |
| 1916 | else |
| 1917 | tracer_enabled = 0; |
| 1918 | |
| 1919 | tr->ctrl = val; |
| 1920 | |
| 1921 | if (current_trace && current_trace->ctrl_update) |
| 1922 | current_trace->ctrl_update(tr); |
| 1923 | } |
| 1924 | mutex_unlock(&trace_types_lock); |
| 1925 | |
| 1926 | filp->f_pos += cnt; |
| 1927 | |
| 1928 | return cnt; |
| 1929 | } |
| 1930 | |
| 1931 | static ssize_t |
| 1932 | tracing_set_trace_read(struct file *filp, char __user *ubuf, |
| 1933 | size_t cnt, loff_t *ppos) |
| 1934 | { |
| 1935 | char buf[max_tracer_type_len+2]; |
| 1936 | int r; |
| 1937 | |
| 1938 | mutex_lock(&trace_types_lock); |
| 1939 | if (current_trace) |
| 1940 | r = sprintf(buf, "%s\n", current_trace->name); |
| 1941 | else |
| 1942 | r = sprintf(buf, "\n"); |
| 1943 | mutex_unlock(&trace_types_lock); |
| 1944 | |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1945 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1946 | } |
| 1947 | |
| 1948 | static ssize_t |
| 1949 | tracing_set_trace_write(struct file *filp, const char __user *ubuf, |
| 1950 | size_t cnt, loff_t *ppos) |
| 1951 | { |
| 1952 | struct trace_array *tr = &global_trace; |
| 1953 | struct tracer *t; |
| 1954 | char buf[max_tracer_type_len+1]; |
| 1955 | int i; |
| 1956 | |
| 1957 | if (cnt > max_tracer_type_len) |
| 1958 | cnt = max_tracer_type_len; |
| 1959 | |
| 1960 | if (copy_from_user(&buf, ubuf, cnt)) |
| 1961 | return -EFAULT; |
| 1962 | |
| 1963 | buf[cnt] = 0; |
| 1964 | |
| 1965 | /* strip ending whitespace. */ |
| 1966 | for (i = cnt - 1; i > 0 && isspace(buf[i]); i--) |
| 1967 | buf[i] = 0; |
| 1968 | |
| 1969 | mutex_lock(&trace_types_lock); |
| 1970 | for (t = trace_types; t; t = t->next) { |
| 1971 | if (strcmp(t->name, buf) == 0) |
| 1972 | break; |
| 1973 | } |
| 1974 | if (!t || t == current_trace) |
| 1975 | goto out; |
| 1976 | |
| 1977 | if (current_trace && current_trace->reset) |
| 1978 | current_trace->reset(tr); |
| 1979 | |
| 1980 | current_trace = t; |
| 1981 | if (t->init) |
| 1982 | t->init(tr); |
| 1983 | |
| 1984 | out: |
| 1985 | mutex_unlock(&trace_types_lock); |
| 1986 | |
| 1987 | filp->f_pos += cnt; |
| 1988 | |
| 1989 | return cnt; |
| 1990 | } |
| 1991 | |
| 1992 | static ssize_t |
| 1993 | tracing_max_lat_read(struct file *filp, char __user *ubuf, |
| 1994 | size_t cnt, loff_t *ppos) |
| 1995 | { |
| 1996 | unsigned long *ptr = filp->private_data; |
| 1997 | char buf[64]; |
| 1998 | int r; |
| 1999 | |
| 2000 | r = snprintf(buf, 64, "%ld\n", |
| 2001 | *ptr == (unsigned long)-1 ? -1 : nsecs_to_usecs(*ptr)); |
| 2002 | if (r > 64) |
| 2003 | r = 64; |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2004 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2005 | } |
| 2006 | |
| 2007 | static ssize_t |
| 2008 | tracing_max_lat_write(struct file *filp, const char __user *ubuf, |
| 2009 | size_t cnt, loff_t *ppos) |
| 2010 | { |
| 2011 | long *ptr = filp->private_data; |
| 2012 | long val; |
| 2013 | char buf[64]; |
| 2014 | |
| 2015 | if (cnt > 63) |
| 2016 | cnt = 63; |
| 2017 | |
| 2018 | if (copy_from_user(&buf, ubuf, cnt)) |
| 2019 | return -EFAULT; |
| 2020 | |
| 2021 | buf[cnt] = 0; |
| 2022 | |
| 2023 | val = simple_strtoul(buf, NULL, 10); |
| 2024 | |
| 2025 | *ptr = val * 1000; |
| 2026 | |
| 2027 | return cnt; |
| 2028 | } |
| 2029 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2030 | static atomic_t tracing_reader; |
| 2031 | |
| 2032 | static int tracing_open_pipe(struct inode *inode, struct file *filp) |
| 2033 | { |
| 2034 | struct trace_iterator *iter; |
| 2035 | |
| 2036 | if (tracing_disabled) |
| 2037 | return -ENODEV; |
| 2038 | |
| 2039 | /* We only allow for reader of the pipe */ |
| 2040 | if (atomic_inc_return(&tracing_reader) != 1) { |
| 2041 | atomic_dec(&tracing_reader); |
| 2042 | return -EBUSY; |
| 2043 | } |
| 2044 | |
| 2045 | /* create a buffer to store the information to pass to userspace */ |
| 2046 | iter = kzalloc(sizeof(*iter), GFP_KERNEL); |
| 2047 | if (!iter) |
| 2048 | return -ENOMEM; |
| 2049 | |
| 2050 | iter->tr = &global_trace; |
| 2051 | |
| 2052 | filp->private_data = iter; |
| 2053 | |
| 2054 | return 0; |
| 2055 | } |
| 2056 | |
| 2057 | static int tracing_release_pipe(struct inode *inode, struct file *file) |
| 2058 | { |
| 2059 | struct trace_iterator *iter = file->private_data; |
| 2060 | |
| 2061 | kfree(iter); |
| 2062 | atomic_dec(&tracing_reader); |
| 2063 | |
| 2064 | return 0; |
| 2065 | } |
| 2066 | |
Soeren Sandmann Pedersen | 2a2cc8f | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2067 | static unsigned int |
| 2068 | tracing_poll_pipe(struct file *filp, poll_table *poll_table) |
| 2069 | { |
| 2070 | struct trace_iterator *iter = filp->private_data; |
| 2071 | |
| 2072 | if (trace_flags & TRACE_ITER_BLOCK) { |
| 2073 | /* |
| 2074 | * Always select as readable when in blocking mode |
| 2075 | */ |
| 2076 | return POLLIN | POLLRDNORM; |
| 2077 | } |
| 2078 | else { |
| 2079 | if (!trace_empty(iter)) |
| 2080 | return POLLIN | POLLRDNORM; |
| 2081 | poll_wait(filp, &trace_wait, poll_table); |
| 2082 | if (!trace_empty(iter)) |
| 2083 | return POLLIN | POLLRDNORM; |
| 2084 | |
| 2085 | return 0; |
| 2086 | } |
| 2087 | } |
| 2088 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2089 | /* |
| 2090 | * Consumer reader. |
| 2091 | */ |
| 2092 | static ssize_t |
| 2093 | tracing_read_pipe(struct file *filp, char __user *ubuf, |
| 2094 | size_t cnt, loff_t *ppos) |
| 2095 | { |
| 2096 | struct trace_iterator *iter = filp->private_data; |
| 2097 | struct trace_array_cpu *data; |
| 2098 | static cpumask_t mask; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2099 | static int start; |
| 2100 | unsigned long flags; |
Ingo Molnar | 2577046 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2101 | #ifdef CONFIG_FTRACE |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2102 | int ftrace_save; |
Ingo Molnar | 2577046 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2103 | #endif |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2104 | int read = 0; |
| 2105 | int cpu; |
| 2106 | int len; |
| 2107 | int ret; |
| 2108 | |
| 2109 | /* return any leftover data */ |
| 2110 | if (iter->seq.len > start) { |
| 2111 | len = iter->seq.len - start; |
| 2112 | if (cnt > len) |
| 2113 | cnt = len; |
| 2114 | ret = copy_to_user(ubuf, iter->seq.buffer + start, cnt); |
| 2115 | if (ret) |
| 2116 | cnt = -EFAULT; |
| 2117 | |
| 2118 | start += len; |
| 2119 | |
| 2120 | return cnt; |
| 2121 | } |
| 2122 | |
| 2123 | trace_seq_reset(&iter->seq); |
| 2124 | start = 0; |
| 2125 | |
| 2126 | while (trace_empty(iter)) { |
Soeren Sandmann Pedersen | 2a2cc8f | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2127 | if (!(trace_flags & TRACE_ITER_BLOCK)) |
| 2128 | return -EWOULDBLOCK; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2129 | /* |
| 2130 | * This is a make-shift waitqueue. The reason we don't use |
| 2131 | * an actual wait queue is because: |
| 2132 | * 1) we only ever have one waiter |
| 2133 | * 2) the tracing, traces all functions, we don't want |
| 2134 | * the overhead of calling wake_up and friends |
| 2135 | * (and tracing them too) |
| 2136 | * Anyway, this is really very primitive wakeup. |
| 2137 | */ |
| 2138 | set_current_state(TASK_INTERRUPTIBLE); |
| 2139 | iter->tr->waiter = current; |
| 2140 | |
| 2141 | /* sleep for one second, and try again. */ |
| 2142 | schedule_timeout(HZ); |
| 2143 | |
| 2144 | iter->tr->waiter = NULL; |
| 2145 | |
| 2146 | if (signal_pending(current)) |
| 2147 | return -EINTR; |
| 2148 | |
| 2149 | /* |
| 2150 | * We block until we read something and tracing is disabled. |
| 2151 | * We still block if tracing is disabled, but we have never |
| 2152 | * read anything. This allows a user to cat this file, and |
| 2153 | * then enable tracing. But after we have read something, |
| 2154 | * we give an EOF when tracing is again disabled. |
| 2155 | * |
| 2156 | * iter->pos will be 0 if we haven't read anything. |
| 2157 | */ |
| 2158 | if (!tracer_enabled && iter->pos) |
| 2159 | break; |
| 2160 | |
| 2161 | continue; |
| 2162 | } |
| 2163 | |
| 2164 | /* stop when tracing is finished */ |
| 2165 | if (trace_empty(iter)) |
| 2166 | return 0; |
| 2167 | |
| 2168 | if (cnt >= PAGE_SIZE) |
| 2169 | cnt = PAGE_SIZE - 1; |
| 2170 | |
| 2171 | memset(iter, 0, sizeof(*iter)); |
| 2172 | iter->tr = &global_trace; |
| 2173 | iter->pos = -1; |
| 2174 | |
| 2175 | /* |
| 2176 | * We need to stop all tracing on all CPUS to read the |
| 2177 | * the next buffer. This is a bit expensive, but is |
| 2178 | * not done often. We fill all what we can read, |
| 2179 | * and then release the locks again. |
| 2180 | */ |
| 2181 | |
| 2182 | cpus_clear(mask); |
| 2183 | local_irq_save(flags); |
Ingo Molnar | 2577046 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2184 | #ifdef CONFIG_FTRACE |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2185 | ftrace_save = ftrace_enabled; |
| 2186 | ftrace_enabled = 0; |
Ingo Molnar | 2577046 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2187 | #endif |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2188 | smp_wmb(); |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2189 | for_each_possible_cpu(cpu) { |
| 2190 | data = iter->tr->data[cpu]; |
| 2191 | |
| 2192 | if (!head_page(data) || !data->trace_idx) |
| 2193 | continue; |
| 2194 | |
| 2195 | atomic_inc(&data->disabled); |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2196 | cpu_set(cpu, mask); |
| 2197 | } |
| 2198 | |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2199 | for_each_cpu_mask(cpu, mask) { |
| 2200 | data = iter->tr->data[cpu]; |
| 2201 | spin_lock(&data->lock); |
| 2202 | } |
| 2203 | |
Steven Rostedt | 088b1e42 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 2204 | while (find_next_entry_inc(iter) != NULL) { |
| 2205 | int len = iter->seq.len; |
| 2206 | |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 2207 | ret = print_trace_line(iter); |
Steven Rostedt | 088b1e42 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 2208 | if (!ret) { |
| 2209 | /* don't print partial lines */ |
| 2210 | iter->seq.len = len; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2211 | break; |
Steven Rostedt | 088b1e42 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 2212 | } |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2213 | |
| 2214 | trace_consume(iter); |
| 2215 | |
| 2216 | if (iter->seq.len >= cnt) |
| 2217 | break; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2218 | } |
| 2219 | |
Ingo Molnar | d4c5a2f | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2220 | for_each_cpu_mask(cpu, mask) { |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2221 | data = iter->tr->data[cpu]; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2222 | spin_unlock(&data->lock); |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2223 | } |
| 2224 | |
| 2225 | for_each_cpu_mask(cpu, mask) { |
| 2226 | data = iter->tr->data[cpu]; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2227 | atomic_dec(&data->disabled); |
| 2228 | } |
Ingo Molnar | 2577046 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2229 | #ifdef CONFIG_FTRACE |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2230 | ftrace_enabled = ftrace_save; |
Ingo Molnar | 2577046 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2231 | #endif |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2232 | local_irq_restore(flags); |
| 2233 | |
| 2234 | /* Now copy what we have to the user */ |
| 2235 | read = iter->seq.len; |
| 2236 | if (read > cnt) |
| 2237 | read = cnt; |
| 2238 | |
| 2239 | ret = copy_to_user(ubuf, iter->seq.buffer, read); |
| 2240 | |
| 2241 | if (read < iter->seq.len) |
| 2242 | start = read; |
| 2243 | else |
| 2244 | trace_seq_reset(&iter->seq); |
| 2245 | |
| 2246 | if (ret) |
| 2247 | read = -EFAULT; |
| 2248 | |
| 2249 | return read; |
| 2250 | } |
| 2251 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2252 | static struct file_operations tracing_max_lat_fops = { |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2253 | .open = tracing_open_generic, |
| 2254 | .read = tracing_max_lat_read, |
| 2255 | .write = tracing_max_lat_write, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2256 | }; |
| 2257 | |
| 2258 | static struct file_operations tracing_ctrl_fops = { |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2259 | .open = tracing_open_generic, |
| 2260 | .read = tracing_ctrl_read, |
| 2261 | .write = tracing_ctrl_write, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2262 | }; |
| 2263 | |
| 2264 | static struct file_operations set_tracer_fops = { |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2265 | .open = tracing_open_generic, |
| 2266 | .read = tracing_set_trace_read, |
| 2267 | .write = tracing_set_trace_write, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2268 | }; |
| 2269 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2270 | static struct file_operations tracing_pipe_fops = { |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2271 | .open = tracing_open_pipe, |
Soeren Sandmann Pedersen | 2a2cc8f | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2272 | .poll = tracing_poll_pipe, |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2273 | .read = tracing_read_pipe, |
| 2274 | .release = tracing_release_pipe, |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2275 | }; |
| 2276 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2277 | #ifdef CONFIG_DYNAMIC_FTRACE |
| 2278 | |
| 2279 | static ssize_t |
| 2280 | tracing_read_long(struct file *filp, char __user *ubuf, |
| 2281 | size_t cnt, loff_t *ppos) |
| 2282 | { |
| 2283 | unsigned long *p = filp->private_data; |
| 2284 | char buf[64]; |
| 2285 | int r; |
| 2286 | |
| 2287 | r = sprintf(buf, "%ld\n", *p); |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2288 | |
| 2289 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2290 | } |
| 2291 | |
| 2292 | static struct file_operations tracing_read_long_fops = { |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2293 | .open = tracing_open_generic, |
| 2294 | .read = tracing_read_long, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2295 | }; |
| 2296 | #endif |
| 2297 | |
| 2298 | static struct dentry *d_tracer; |
| 2299 | |
| 2300 | struct dentry *tracing_init_dentry(void) |
| 2301 | { |
| 2302 | static int once; |
| 2303 | |
| 2304 | if (d_tracer) |
| 2305 | return d_tracer; |
| 2306 | |
| 2307 | d_tracer = debugfs_create_dir("tracing", NULL); |
| 2308 | |
| 2309 | if (!d_tracer && !once) { |
| 2310 | once = 1; |
| 2311 | pr_warning("Could not create debugfs directory 'tracing'\n"); |
| 2312 | return NULL; |
| 2313 | } |
| 2314 | |
| 2315 | return d_tracer; |
| 2316 | } |
| 2317 | |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 2318 | #ifdef CONFIG_FTRACE_SELFTEST |
| 2319 | /* Let selftest have access to static functions in this file */ |
| 2320 | #include "trace_selftest.c" |
| 2321 | #endif |
| 2322 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2323 | static __init void tracer_init_debugfs(void) |
| 2324 | { |
| 2325 | struct dentry *d_tracer; |
| 2326 | struct dentry *entry; |
| 2327 | |
| 2328 | d_tracer = tracing_init_dentry(); |
| 2329 | |
| 2330 | entry = debugfs_create_file("tracing_enabled", 0644, d_tracer, |
| 2331 | &global_trace, &tracing_ctrl_fops); |
| 2332 | if (!entry) |
| 2333 | pr_warning("Could not create debugfs 'tracing_enabled' entry\n"); |
| 2334 | |
| 2335 | entry = debugfs_create_file("iter_ctrl", 0644, d_tracer, |
| 2336 | NULL, &tracing_iter_fops); |
| 2337 | if (!entry) |
| 2338 | pr_warning("Could not create debugfs 'iter_ctrl' entry\n"); |
| 2339 | |
| 2340 | entry = debugfs_create_file("latency_trace", 0444, d_tracer, |
| 2341 | &global_trace, &tracing_lt_fops); |
| 2342 | if (!entry) |
| 2343 | pr_warning("Could not create debugfs 'latency_trace' entry\n"); |
| 2344 | |
| 2345 | entry = debugfs_create_file("trace", 0444, d_tracer, |
| 2346 | &global_trace, &tracing_fops); |
| 2347 | if (!entry) |
| 2348 | pr_warning("Could not create debugfs 'trace' entry\n"); |
| 2349 | |
| 2350 | entry = debugfs_create_file("available_tracers", 0444, d_tracer, |
| 2351 | &global_trace, &show_traces_fops); |
| 2352 | if (!entry) |
| 2353 | pr_warning("Could not create debugfs 'trace' entry\n"); |
| 2354 | |
| 2355 | entry = debugfs_create_file("current_tracer", 0444, d_tracer, |
| 2356 | &global_trace, &set_tracer_fops); |
| 2357 | if (!entry) |
| 2358 | pr_warning("Could not create debugfs 'trace' entry\n"); |
| 2359 | |
| 2360 | entry = debugfs_create_file("tracing_max_latency", 0644, d_tracer, |
| 2361 | &tracing_max_latency, |
| 2362 | &tracing_max_lat_fops); |
| 2363 | if (!entry) |
| 2364 | pr_warning("Could not create debugfs " |
| 2365 | "'tracing_max_latency' entry\n"); |
| 2366 | |
| 2367 | entry = debugfs_create_file("tracing_thresh", 0644, d_tracer, |
| 2368 | &tracing_thresh, &tracing_max_lat_fops); |
| 2369 | if (!entry) |
| 2370 | pr_warning("Could not create debugfs " |
| 2371 | "'tracing_threash' entry\n"); |
Ingo Molnar | 7bd2f24 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 2372 | entry = debugfs_create_file("README", 0644, d_tracer, |
| 2373 | NULL, &tracing_readme_fops); |
| 2374 | if (!entry) |
| 2375 | pr_warning("Could not create debugfs 'README' entry\n"); |
| 2376 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2377 | entry = debugfs_create_file("trace_pipe", 0644, d_tracer, |
| 2378 | NULL, &tracing_pipe_fops); |
| 2379 | if (!entry) |
| 2380 | pr_warning("Could not create debugfs " |
| 2381 | "'tracing_threash' entry\n"); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2382 | |
| 2383 | #ifdef CONFIG_DYNAMIC_FTRACE |
| 2384 | entry = debugfs_create_file("dyn_ftrace_total_info", 0444, d_tracer, |
| 2385 | &ftrace_update_tot_cnt, |
| 2386 | &tracing_read_long_fops); |
| 2387 | if (!entry) |
| 2388 | pr_warning("Could not create debugfs " |
| 2389 | "'dyn_ftrace_total_info' entry\n"); |
| 2390 | #endif |
| 2391 | } |
| 2392 | |
| 2393 | /* dummy trace to disable tracing */ |
| 2394 | static struct tracer no_tracer __read_mostly = |
| 2395 | { |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2396 | .name = "none", |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2397 | }; |
| 2398 | |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2399 | static int trace_alloc_page(void) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2400 | { |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2401 | struct trace_array_cpu *data; |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2402 | struct page *page, *tmp; |
| 2403 | LIST_HEAD(pages); |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 2404 | void *array; |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2405 | int i; |
| 2406 | |
| 2407 | /* first allocate a page for each CPU */ |
| 2408 | for_each_possible_cpu(i) { |
| 2409 | array = (void *)__get_free_page(GFP_KERNEL); |
| 2410 | if (array == NULL) { |
| 2411 | printk(KERN_ERR "tracer: failed to allocate page" |
| 2412 | "for trace buffer!\n"); |
| 2413 | goto free_pages; |
| 2414 | } |
| 2415 | |
| 2416 | page = virt_to_page(array); |
| 2417 | list_add(&page->lru, &pages); |
| 2418 | |
| 2419 | /* Only allocate if we are actually using the max trace */ |
| 2420 | #ifdef CONFIG_TRACER_MAX_TRACE |
| 2421 | array = (void *)__get_free_page(GFP_KERNEL); |
| 2422 | if (array == NULL) { |
| 2423 | printk(KERN_ERR "tracer: failed to allocate page" |
| 2424 | "for trace buffer!\n"); |
| 2425 | goto free_pages; |
| 2426 | } |
| 2427 | page = virt_to_page(array); |
| 2428 | list_add(&page->lru, &pages); |
| 2429 | #endif |
| 2430 | } |
| 2431 | |
| 2432 | /* Now that we successfully allocate a page per CPU, add them */ |
| 2433 | for_each_possible_cpu(i) { |
| 2434 | data = global_trace.data[i]; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2435 | spin_lock_init(&data->lock); |
Ingo Molnar | d4c5a2f | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2436 | lockdep_set_class(&data->lock, &data->lock_key); |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2437 | page = list_entry(pages.next, struct page, lru); |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 2438 | list_del_init(&page->lru); |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2439 | list_add_tail(&page->lru, &data->trace_pages); |
| 2440 | ClearPageLRU(page); |
| 2441 | |
| 2442 | #ifdef CONFIG_TRACER_MAX_TRACE |
| 2443 | data = max_tr.data[i]; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2444 | spin_lock_init(&data->lock); |
Ingo Molnar | d4c5a2f | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2445 | lockdep_set_class(&data->lock, &data->lock_key); |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2446 | page = list_entry(pages.next, struct page, lru); |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 2447 | list_del_init(&page->lru); |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2448 | list_add_tail(&page->lru, &data->trace_pages); |
| 2449 | SetPageLRU(page); |
| 2450 | #endif |
| 2451 | } |
| 2452 | global_trace.entries += ENTRIES_PER_PAGE; |
| 2453 | |
| 2454 | return 0; |
| 2455 | |
| 2456 | free_pages: |
| 2457 | list_for_each_entry_safe(page, tmp, &pages, lru) { |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 2458 | list_del_init(&page->lru); |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2459 | __free_page(page); |
| 2460 | } |
| 2461 | return -ENOMEM; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2462 | } |
| 2463 | |
| 2464 | __init static int tracer_alloc_buffers(void) |
| 2465 | { |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2466 | struct trace_array_cpu *data; |
| 2467 | void *array; |
| 2468 | struct page *page; |
| 2469 | int pages = 0; |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 2470 | int ret = -ENOMEM; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2471 | int i; |
| 2472 | |
Steven Rostedt | 26994ea | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 2473 | global_trace.ctrl = tracer_enabled; |
| 2474 | |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2475 | /* Allocate the first page for all buffers */ |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2476 | for_each_possible_cpu(i) { |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2477 | data = global_trace.data[i] = &per_cpu(global_trace_cpu, i); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2478 | max_tr.data[i] = &per_cpu(max_data, i); |
| 2479 | |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2480 | array = (void *)__get_free_page(GFP_KERNEL); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2481 | if (array == NULL) { |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2482 | printk(KERN_ERR "tracer: failed to allocate page" |
| 2483 | "for trace buffer!\n"); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2484 | goto free_buffers; |
| 2485 | } |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2486 | |
| 2487 | /* set the array to the list */ |
| 2488 | INIT_LIST_HEAD(&data->trace_pages); |
| 2489 | page = virt_to_page(array); |
| 2490 | list_add(&page->lru, &data->trace_pages); |
| 2491 | /* use the LRU flag to differentiate the two buffers */ |
| 2492 | ClearPageLRU(page); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2493 | |
| 2494 | /* Only allocate if we are actually using the max trace */ |
| 2495 | #ifdef CONFIG_TRACER_MAX_TRACE |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2496 | array = (void *)__get_free_page(GFP_KERNEL); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2497 | if (array == NULL) { |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2498 | printk(KERN_ERR "tracer: failed to allocate page" |
| 2499 | "for trace buffer!\n"); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2500 | goto free_buffers; |
| 2501 | } |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2502 | |
| 2503 | INIT_LIST_HEAD(&max_tr.data[i]->trace_pages); |
| 2504 | page = virt_to_page(array); |
| 2505 | list_add(&page->lru, &max_tr.data[i]->trace_pages); |
| 2506 | SetPageLRU(page); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2507 | #endif |
| 2508 | } |
| 2509 | |
| 2510 | /* |
| 2511 | * Since we allocate by orders of pages, we may be able to |
| 2512 | * round up a bit. |
| 2513 | */ |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2514 | global_trace.entries = ENTRIES_PER_PAGE; |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2515 | pages++; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2516 | |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2517 | while (global_trace.entries < trace_nr_entries) { |
| 2518 | if (trace_alloc_page()) |
| 2519 | break; |
| 2520 | pages++; |
| 2521 | } |
Steven Rostedt | 89b2f97 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 2522 | max_tr.entries = global_trace.entries; |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2523 | |
| 2524 | pr_info("tracer: %d pages allocated for %ld", |
| 2525 | pages, trace_nr_entries); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2526 | pr_info(" entries of %ld bytes\n", (long)TRACE_ENTRY_SIZE); |
| 2527 | pr_info(" actual entries %ld\n", global_trace.entries); |
| 2528 | |
| 2529 | tracer_init_debugfs(); |
| 2530 | |
| 2531 | trace_init_cmdlines(); |
| 2532 | |
| 2533 | register_tracer(&no_tracer); |
| 2534 | current_trace = &no_tracer; |
| 2535 | |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 2536 | /* All seems OK, enable tracing */ |
| 2537 | tracing_disabled = 0; |
| 2538 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2539 | return 0; |
| 2540 | |
| 2541 | free_buffers: |
| 2542 | for (i-- ; i >= 0; i--) { |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2543 | struct page *page, *tmp; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2544 | struct trace_array_cpu *data = global_trace.data[i]; |
| 2545 | |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 2546 | if (data) { |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2547 | list_for_each_entry_safe(page, tmp, |
| 2548 | &data->trace_pages, lru) { |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 2549 | list_del_init(&page->lru); |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2550 | __free_page(page); |
| 2551 | } |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2552 | } |
| 2553 | |
| 2554 | #ifdef CONFIG_TRACER_MAX_TRACE |
| 2555 | data = max_tr.data[i]; |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 2556 | if (data) { |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2557 | list_for_each_entry_safe(page, tmp, |
| 2558 | &data->trace_pages, lru) { |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 2559 | list_del_init(&page->lru); |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2560 | __free_page(page); |
| 2561 | } |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2562 | } |
| 2563 | #endif |
| 2564 | } |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 2565 | return ret; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2566 | } |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 2567 | fs_initcall(tracer_alloc_buffers); |