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 | |
| 31 | #include "trace.h" |
| 32 | |
| 33 | unsigned long __read_mostly tracing_max_latency = (cycle_t)ULONG_MAX; |
| 34 | unsigned long __read_mostly tracing_thresh; |
| 35 | |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 36 | static int tracing_disabled = 1; |
| 37 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame^] | 38 | static long |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 39 | ns2usecs(cycle_t nsec) |
| 40 | { |
| 41 | nsec += 500; |
| 42 | do_div(nsec, 1000); |
| 43 | return nsec; |
| 44 | } |
| 45 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame^] | 46 | cycle_t ftrace_now(int cpu) |
Ingo Molnar | 750ed1a | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 47 | { |
Ingo Molnar | 0fd9e0d | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 48 | return cpu_clock(cpu); |
Ingo Molnar | 750ed1a | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 49 | } |
| 50 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 51 | static struct trace_array global_trace; |
| 52 | |
| 53 | static DEFINE_PER_CPU(struct trace_array_cpu, global_trace_cpu); |
| 54 | |
| 55 | static struct trace_array max_tr; |
| 56 | |
| 57 | static DEFINE_PER_CPU(struct trace_array_cpu, max_data); |
| 58 | |
Steven Rostedt | 26994ea | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 59 | static int tracer_enabled = 1; |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 60 | static unsigned long trace_nr_entries = 16384UL; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 61 | |
| 62 | static struct tracer *trace_types __read_mostly; |
| 63 | static struct tracer *current_trace __read_mostly; |
| 64 | static int max_tracer_type_len; |
| 65 | |
| 66 | static DEFINE_MUTEX(trace_types_lock); |
Soeren Sandmann Pedersen | 2a2cc8f | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 67 | static DECLARE_WAIT_QUEUE_HEAD (trace_wait); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 68 | |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 69 | #define ENTRIES_PER_PAGE (PAGE_SIZE / sizeof(struct trace_entry)) |
| 70 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 71 | static int __init set_nr_entries(char *str) |
| 72 | { |
| 73 | if (!str) |
| 74 | return 0; |
| 75 | trace_nr_entries = simple_strtoul(str, &str, 0); |
| 76 | return 1; |
| 77 | } |
| 78 | __setup("trace_entries=", set_nr_entries); |
| 79 | |
Steven Rostedt | 57f50be | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 80 | unsigned long nsecs_to_usecs(unsigned long nsecs) |
| 81 | { |
| 82 | return nsecs / 1000; |
| 83 | } |
| 84 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 85 | enum trace_type { |
| 86 | __TRACE_FIRST_TYPE = 0, |
| 87 | |
| 88 | TRACE_FN, |
| 89 | TRACE_CTX, |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 90 | TRACE_SPECIAL, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 91 | |
| 92 | __TRACE_LAST_TYPE |
| 93 | }; |
| 94 | |
| 95 | enum trace_flag_type { |
| 96 | TRACE_FLAG_IRQS_OFF = 0x01, |
| 97 | TRACE_FLAG_NEED_RESCHED = 0x02, |
| 98 | TRACE_FLAG_HARDIRQ = 0x04, |
| 99 | TRACE_FLAG_SOFTIRQ = 0x08, |
| 100 | }; |
| 101 | |
| 102 | enum trace_iterator_flags { |
| 103 | TRACE_ITER_PRINT_PARENT = 0x01, |
| 104 | TRACE_ITER_SYM_OFFSET = 0x02, |
| 105 | TRACE_ITER_SYM_ADDR = 0x04, |
| 106 | TRACE_ITER_VERBOSE = 0x08, |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 107 | TRACE_ITER_RAW = 0x10, |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 108 | TRACE_ITER_HEX = 0x20, |
| 109 | TRACE_ITER_BIN = 0x40, |
Soeren Sandmann Pedersen | 2a2cc8f | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 110 | TRACE_ITER_BLOCK = 0x80, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 111 | }; |
| 112 | |
| 113 | #define TRACE_ITER_SYM_MASK \ |
| 114 | (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR) |
| 115 | |
| 116 | /* These must match the bit postions above */ |
| 117 | static const char *trace_options[] = { |
| 118 | "print-parent", |
| 119 | "sym-offset", |
| 120 | "sym-addr", |
| 121 | "verbose", |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 122 | "raw", |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 123 | "hex", |
Ingo Molnar | cb0f12a | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 124 | "bin", |
Soeren Sandmann Pedersen | 2a2cc8f | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 125 | "block", |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 126 | NULL |
| 127 | }; |
| 128 | |
| 129 | static unsigned trace_flags; |
| 130 | |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 131 | static DEFINE_SPINLOCK(ftrace_max_lock); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 132 | |
| 133 | /* |
| 134 | * Copy the new maximum trace into the separate maximum-trace |
| 135 | * structure. (this way the maximum trace is permanently saved, |
| 136 | * for later retrieval via /debugfs/tracing/latency_trace) |
| 137 | */ |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame^] | 138 | static void |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 139 | __update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu) |
| 140 | { |
| 141 | struct trace_array_cpu *data = tr->data[cpu]; |
| 142 | |
| 143 | max_tr.cpu = cpu; |
| 144 | max_tr.time_start = data->preempt_timestamp; |
| 145 | |
| 146 | data = max_tr.data[cpu]; |
| 147 | data->saved_latency = tracing_max_latency; |
| 148 | |
| 149 | memcpy(data->comm, tsk->comm, TASK_COMM_LEN); |
| 150 | data->pid = tsk->pid; |
| 151 | data->uid = tsk->uid; |
| 152 | data->nice = tsk->static_prio - 20 - MAX_RT_PRIO; |
| 153 | data->policy = tsk->policy; |
| 154 | data->rt_priority = tsk->rt_priority; |
| 155 | |
| 156 | /* record this tasks comm */ |
| 157 | tracing_record_cmdline(current); |
| 158 | } |
| 159 | |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 160 | void check_pages(struct trace_array_cpu *data) |
| 161 | { |
| 162 | struct page *page, *tmp; |
| 163 | |
| 164 | BUG_ON(data->trace_pages.next->prev != &data->trace_pages); |
| 165 | BUG_ON(data->trace_pages.prev->next != &data->trace_pages); |
| 166 | |
| 167 | list_for_each_entry_safe(page, tmp, &data->trace_pages, lru) { |
| 168 | BUG_ON(page->lru.next->prev != &page->lru); |
| 169 | BUG_ON(page->lru.prev->next != &page->lru); |
| 170 | } |
| 171 | } |
| 172 | |
| 173 | void *head_page(struct trace_array_cpu *data) |
| 174 | { |
| 175 | struct page *page; |
| 176 | |
| 177 | check_pages(data); |
| 178 | if (list_empty(&data->trace_pages)) |
| 179 | return NULL; |
| 180 | |
| 181 | page = list_entry(data->trace_pages.next, struct page, lru); |
| 182 | BUG_ON(&page->lru == &data->trace_pages); |
| 183 | |
| 184 | return page_address(page); |
| 185 | } |
| 186 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame^] | 187 | static int |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 188 | trace_seq_printf(struct trace_seq *s, const char *fmt, ...) |
| 189 | { |
| 190 | int len = (PAGE_SIZE - 1) - s->len; |
| 191 | va_list ap; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 192 | int ret; |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 193 | |
| 194 | if (!len) |
| 195 | return 0; |
| 196 | |
| 197 | va_start(ap, fmt); |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 198 | ret = vsnprintf(s->buffer + s->len, len, fmt, ap); |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 199 | va_end(ap); |
| 200 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 201 | /* If we can't write it all, don't bother writing anything */ |
| 202 | if (ret > len) |
| 203 | return 0; |
| 204 | |
| 205 | s->len += ret; |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 206 | |
| 207 | return len; |
| 208 | } |
| 209 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame^] | 210 | static int |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 211 | trace_seq_puts(struct trace_seq *s, const char *str) |
| 212 | { |
| 213 | int len = strlen(str); |
| 214 | |
| 215 | if (len > ((PAGE_SIZE - 1) - s->len)) |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 216 | return 0; |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 217 | |
| 218 | memcpy(s->buffer + s->len, str, len); |
| 219 | s->len += len; |
| 220 | |
| 221 | return len; |
| 222 | } |
| 223 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame^] | 224 | static int |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 225 | trace_seq_putc(struct trace_seq *s, unsigned char c) |
| 226 | { |
| 227 | if (s->len >= (PAGE_SIZE - 1)) |
| 228 | return 0; |
| 229 | |
| 230 | s->buffer[s->len++] = c; |
| 231 | |
| 232 | return 1; |
| 233 | } |
| 234 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame^] | 235 | static int |
Ingo Molnar | cb0f12a | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 236 | trace_seq_putmem(struct trace_seq *s, void *mem, size_t len) |
| 237 | { |
| 238 | if (len > ((PAGE_SIZE - 1) - s->len)) |
| 239 | return 0; |
| 240 | |
| 241 | memcpy(s->buffer + s->len, mem, len); |
| 242 | s->len += len; |
| 243 | |
| 244 | return len; |
| 245 | } |
| 246 | |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 247 | #define HEX_CHARS 17 |
| 248 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame^] | 249 | static int |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 250 | trace_seq_putmem_hex(struct trace_seq *s, void *mem, size_t len) |
| 251 | { |
| 252 | unsigned char hex[HEX_CHARS]; |
| 253 | unsigned char *data; |
| 254 | unsigned char byte; |
| 255 | int i, j; |
| 256 | |
| 257 | BUG_ON(len >= HEX_CHARS); |
| 258 | |
| 259 | data = mem; |
| 260 | |
| 261 | #ifdef __BIG_ENDIAN |
| 262 | for (i = 0, j = 0; i < len; i++) { |
| 263 | #else |
| 264 | for (i = len-1, j = 0; i >= 0; i--) { |
| 265 | #endif |
| 266 | byte = data[i]; |
| 267 | |
| 268 | hex[j] = byte & 0x0f; |
| 269 | if (hex[j] >= 10) |
| 270 | hex[j] += 'a' - 10; |
| 271 | else |
| 272 | hex[j] += '0'; |
| 273 | j++; |
| 274 | |
| 275 | hex[j] = byte >> 4; |
| 276 | if (hex[j] >= 10) |
| 277 | hex[j] += 'a' - 10; |
| 278 | else |
| 279 | hex[j] += '0'; |
| 280 | j++; |
| 281 | } |
| 282 | hex[j] = ' '; |
| 283 | j++; |
| 284 | |
| 285 | return trace_seq_putmem(s, hex, j); |
| 286 | } |
| 287 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame^] | 288 | static void |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 289 | trace_seq_reset(struct trace_seq *s) |
| 290 | { |
| 291 | s->len = 0; |
| 292 | } |
| 293 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame^] | 294 | static void |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 295 | trace_print_seq(struct seq_file *m, struct trace_seq *s) |
| 296 | { |
| 297 | int len = s->len >= PAGE_SIZE ? PAGE_SIZE - 1 : s->len; |
| 298 | |
| 299 | s->buffer[len] = 0; |
| 300 | seq_puts(m, s->buffer); |
| 301 | |
| 302 | trace_seq_reset(s); |
| 303 | } |
| 304 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame^] | 305 | static void |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 306 | flip_trace(struct trace_array_cpu *tr1, struct trace_array_cpu *tr2) |
| 307 | { |
| 308 | struct list_head flip_pages; |
| 309 | |
| 310 | INIT_LIST_HEAD(&flip_pages); |
| 311 | |
Steven Rostedt | 93a588f | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 312 | memcpy(&tr1->trace_head_idx, &tr2->trace_head_idx, |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 313 | sizeof(struct trace_array_cpu) - |
Steven Rostedt | 93a588f | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 314 | offsetof(struct trace_array_cpu, trace_head_idx)); |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 315 | |
| 316 | check_pages(tr1); |
| 317 | check_pages(tr2); |
| 318 | list_splice_init(&tr1->trace_pages, &flip_pages); |
| 319 | list_splice_init(&tr2->trace_pages, &tr1->trace_pages); |
| 320 | list_splice_init(&flip_pages, &tr2->trace_pages); |
| 321 | BUG_ON(!list_empty(&flip_pages)); |
| 322 | check_pages(tr1); |
| 323 | check_pages(tr2); |
| 324 | } |
| 325 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame^] | 326 | void |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 327 | update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu) |
| 328 | { |
| 329 | struct trace_array_cpu *data; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 330 | int i; |
| 331 | |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 332 | WARN_ON_ONCE(!irqs_disabled()); |
| 333 | spin_lock(&ftrace_max_lock); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 334 | /* clear out all the previous traces */ |
| 335 | for_each_possible_cpu(i) { |
| 336 | data = tr->data[i]; |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 337 | flip_trace(max_tr.data[i], data); |
Steven Rostedt | 89b2f97 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 338 | tracing_reset(data); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 339 | } |
| 340 | |
| 341 | __update_max_tr(tr, tsk, cpu); |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 342 | spin_unlock(&ftrace_max_lock); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 343 | } |
| 344 | |
| 345 | /** |
| 346 | * update_max_tr_single - only copy one trace over, and reset the rest |
| 347 | * @tr - tracer |
| 348 | * @tsk - task with the latency |
| 349 | * @cpu - the cpu of the buffer to copy. |
| 350 | */ |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame^] | 351 | void |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 352 | update_max_tr_single(struct trace_array *tr, struct task_struct *tsk, int cpu) |
| 353 | { |
| 354 | struct trace_array_cpu *data = tr->data[cpu]; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 355 | int i; |
| 356 | |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 357 | WARN_ON_ONCE(!irqs_disabled()); |
| 358 | spin_lock(&ftrace_max_lock); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 359 | for_each_possible_cpu(i) |
| 360 | tracing_reset(max_tr.data[i]); |
| 361 | |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 362 | flip_trace(max_tr.data[cpu], data); |
Steven Rostedt | 89b2f97 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 363 | tracing_reset(data); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 364 | |
| 365 | __update_max_tr(tr, tsk, cpu); |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 366 | spin_unlock(&ftrace_max_lock); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 367 | } |
| 368 | |
| 369 | int register_tracer(struct tracer *type) |
| 370 | { |
| 371 | struct tracer *t; |
| 372 | int len; |
| 373 | int ret = 0; |
| 374 | |
| 375 | if (!type->name) { |
| 376 | pr_info("Tracer must have a name\n"); |
| 377 | return -1; |
| 378 | } |
| 379 | |
| 380 | mutex_lock(&trace_types_lock); |
| 381 | for (t = trace_types; t; t = t->next) { |
| 382 | if (strcmp(type->name, t->name) == 0) { |
| 383 | /* already found */ |
| 384 | pr_info("Trace %s already registered\n", |
| 385 | type->name); |
| 386 | ret = -1; |
| 387 | goto out; |
| 388 | } |
| 389 | } |
| 390 | |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 391 | #ifdef CONFIG_FTRACE_STARTUP_TEST |
| 392 | if (type->selftest) { |
| 393 | struct tracer *saved_tracer = current_trace; |
| 394 | struct trace_array_cpu *data; |
| 395 | struct trace_array *tr = &global_trace; |
| 396 | int saved_ctrl = tr->ctrl; |
| 397 | int i; |
| 398 | /* |
| 399 | * Run a selftest on this tracer. |
| 400 | * Here we reset the trace buffer, and set the current |
| 401 | * tracer to be this tracer. The tracer can then run some |
| 402 | * internal tracing to verify that everything is in order. |
| 403 | * If we fail, we do not register this tracer. |
| 404 | */ |
| 405 | for_each_possible_cpu(i) { |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 406 | data = tr->data[i]; |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 407 | if (!head_page(data)) |
| 408 | continue; |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 409 | tracing_reset(data); |
| 410 | } |
| 411 | current_trace = type; |
| 412 | tr->ctrl = 0; |
| 413 | /* the test is responsible for initializing and enabling */ |
| 414 | pr_info("Testing tracer %s: ", type->name); |
| 415 | ret = type->selftest(type, tr); |
| 416 | /* the test is responsible for resetting too */ |
| 417 | current_trace = saved_tracer; |
| 418 | tr->ctrl = saved_ctrl; |
| 419 | if (ret) { |
| 420 | printk(KERN_CONT "FAILED!\n"); |
| 421 | goto out; |
| 422 | } |
Steven Rostedt | 1d4db00 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 423 | /* Only reset on passing, to avoid touching corrupted buffers */ |
| 424 | for_each_possible_cpu(i) { |
| 425 | data = tr->data[i]; |
| 426 | if (!head_page(data)) |
| 427 | continue; |
| 428 | tracing_reset(data); |
| 429 | } |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 430 | printk(KERN_CONT "PASSED\n"); |
| 431 | } |
| 432 | #endif |
| 433 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 434 | type->next = trace_types; |
| 435 | trace_types = type; |
| 436 | len = strlen(type->name); |
| 437 | if (len > max_tracer_type_len) |
| 438 | max_tracer_type_len = len; |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 439 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 440 | out: |
| 441 | mutex_unlock(&trace_types_lock); |
| 442 | |
| 443 | return ret; |
| 444 | } |
| 445 | |
| 446 | void unregister_tracer(struct tracer *type) |
| 447 | { |
| 448 | struct tracer **t; |
| 449 | int len; |
| 450 | |
| 451 | mutex_lock(&trace_types_lock); |
| 452 | for (t = &trace_types; *t; t = &(*t)->next) { |
| 453 | if (*t == type) |
| 454 | goto found; |
| 455 | } |
| 456 | pr_info("Trace %s not registered\n", type->name); |
| 457 | goto out; |
| 458 | |
| 459 | found: |
| 460 | *t = (*t)->next; |
| 461 | if (strlen(type->name) != max_tracer_type_len) |
| 462 | goto out; |
| 463 | |
| 464 | max_tracer_type_len = 0; |
| 465 | for (t = &trace_types; *t; t = &(*t)->next) { |
| 466 | len = strlen((*t)->name); |
| 467 | if (len > max_tracer_type_len) |
| 468 | max_tracer_type_len = len; |
| 469 | } |
| 470 | out: |
| 471 | mutex_unlock(&trace_types_lock); |
| 472 | } |
| 473 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame^] | 474 | void tracing_reset(struct trace_array_cpu *data) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 475 | { |
| 476 | data->trace_idx = 0; |
Steven Rostedt | 93a588f | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 477 | data->trace_head = data->trace_tail = head_page(data); |
| 478 | data->trace_head_idx = 0; |
| 479 | data->trace_tail_idx = 0; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 480 | } |
| 481 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 482 | #define SAVED_CMDLINES 128 |
| 483 | static unsigned map_pid_to_cmdline[PID_MAX_DEFAULT+1]; |
| 484 | static unsigned map_cmdline_to_pid[SAVED_CMDLINES]; |
| 485 | static char saved_cmdlines[SAVED_CMDLINES][TASK_COMM_LEN]; |
| 486 | static int cmdline_idx; |
| 487 | static DEFINE_SPINLOCK(trace_cmdline_lock); |
| 488 | atomic_t trace_record_cmdline_disabled; |
| 489 | |
| 490 | static void trace_init_cmdlines(void) |
| 491 | { |
| 492 | memset(&map_pid_to_cmdline, -1, sizeof(map_pid_to_cmdline)); |
| 493 | memset(&map_cmdline_to_pid, -1, sizeof(map_cmdline_to_pid)); |
| 494 | cmdline_idx = 0; |
| 495 | } |
| 496 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame^] | 497 | void trace_stop_cmdline_recording(void); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 498 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame^] | 499 | static void trace_save_cmdline(struct task_struct *tsk) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 500 | { |
| 501 | unsigned map; |
| 502 | unsigned idx; |
| 503 | |
| 504 | if (!tsk->pid || unlikely(tsk->pid > PID_MAX_DEFAULT)) |
| 505 | return; |
| 506 | |
| 507 | /* |
| 508 | * It's not the end of the world if we don't get |
| 509 | * the lock, but we also don't want to spin |
| 510 | * nor do we want to disable interrupts, |
| 511 | * so if we miss here, then better luck next time. |
| 512 | */ |
| 513 | if (!spin_trylock(&trace_cmdline_lock)) |
| 514 | return; |
| 515 | |
| 516 | idx = map_pid_to_cmdline[tsk->pid]; |
| 517 | if (idx >= SAVED_CMDLINES) { |
| 518 | idx = (cmdline_idx + 1) % SAVED_CMDLINES; |
| 519 | |
| 520 | map = map_cmdline_to_pid[idx]; |
| 521 | if (map <= PID_MAX_DEFAULT) |
| 522 | map_pid_to_cmdline[map] = (unsigned)-1; |
| 523 | |
| 524 | map_pid_to_cmdline[tsk->pid] = idx; |
| 525 | |
| 526 | cmdline_idx = idx; |
| 527 | } |
| 528 | |
| 529 | memcpy(&saved_cmdlines[idx], tsk->comm, TASK_COMM_LEN); |
| 530 | |
| 531 | spin_unlock(&trace_cmdline_lock); |
| 532 | } |
| 533 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame^] | 534 | static char *trace_find_cmdline(int pid) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 535 | { |
| 536 | char *cmdline = "<...>"; |
| 537 | unsigned map; |
| 538 | |
| 539 | if (!pid) |
| 540 | return "<idle>"; |
| 541 | |
| 542 | if (pid > PID_MAX_DEFAULT) |
| 543 | goto out; |
| 544 | |
| 545 | map = map_pid_to_cmdline[pid]; |
| 546 | if (map >= SAVED_CMDLINES) |
| 547 | goto out; |
| 548 | |
| 549 | cmdline = saved_cmdlines[map]; |
| 550 | |
| 551 | out: |
| 552 | return cmdline; |
| 553 | } |
| 554 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame^] | 555 | void tracing_record_cmdline(struct task_struct *tsk) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 556 | { |
| 557 | if (atomic_read(&trace_record_cmdline_disabled)) |
| 558 | return; |
| 559 | |
| 560 | trace_save_cmdline(tsk); |
| 561 | } |
| 562 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame^] | 563 | static inline struct list_head * |
Steven Rostedt | 93a588f | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 564 | trace_next_list(struct trace_array_cpu *data, struct list_head *next) |
| 565 | { |
| 566 | /* |
| 567 | * Roundrobin - but skip the head (which is not a real page): |
| 568 | */ |
| 569 | next = next->next; |
| 570 | if (unlikely(next == &data->trace_pages)) |
| 571 | next = next->next; |
| 572 | BUG_ON(next == &data->trace_pages); |
| 573 | |
| 574 | return next; |
| 575 | } |
| 576 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame^] | 577 | static inline void * |
Steven Rostedt | 93a588f | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 578 | trace_next_page(struct trace_array_cpu *data, void *addr) |
| 579 | { |
| 580 | struct list_head *next; |
| 581 | struct page *page; |
| 582 | |
| 583 | page = virt_to_page(addr); |
| 584 | |
| 585 | next = trace_next_list(data, &page->lru); |
| 586 | page = list_entry(next, struct page, lru); |
| 587 | |
| 588 | return page_address(page); |
| 589 | } |
| 590 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame^] | 591 | static inline struct trace_entry * |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 592 | 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] | 593 | { |
| 594 | unsigned long idx, idx_next; |
| 595 | struct trace_entry *entry; |
| 596 | |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 597 | data->trace_idx++; |
Steven Rostedt | 93a588f | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 598 | idx = data->trace_head_idx; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 599 | idx_next = idx + 1; |
| 600 | |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 601 | BUG_ON(idx * TRACE_ENTRY_SIZE >= PAGE_SIZE); |
| 602 | |
Steven Rostedt | 93a588f | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 603 | entry = data->trace_head + idx * TRACE_ENTRY_SIZE; |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 604 | |
| 605 | if (unlikely(idx_next >= ENTRIES_PER_PAGE)) { |
Steven Rostedt | 93a588f | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 606 | data->trace_head = trace_next_page(data, data->trace_head); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 607 | idx_next = 0; |
| 608 | } |
| 609 | |
Steven Rostedt | 93a588f | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 610 | if (data->trace_head == data->trace_tail && |
| 611 | idx_next == data->trace_tail_idx) { |
| 612 | /* overrun */ |
| 613 | data->trace_tail_idx++; |
| 614 | if (data->trace_tail_idx >= ENTRIES_PER_PAGE) { |
| 615 | data->trace_tail = |
| 616 | trace_next_page(data, data->trace_tail); |
| 617 | data->trace_tail_idx = 0; |
| 618 | } |
| 619 | } |
| 620 | |
| 621 | data->trace_head_idx = idx_next; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 622 | |
| 623 | return entry; |
| 624 | } |
| 625 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame^] | 626 | static inline void |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 627 | tracing_generic_entry_update(struct trace_entry *entry, unsigned long flags) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 628 | { |
| 629 | struct task_struct *tsk = current; |
| 630 | unsigned long pc; |
| 631 | |
| 632 | pc = preempt_count(); |
| 633 | |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 634 | entry->preempt_count = pc & 0xff; |
| 635 | entry->pid = tsk->pid; |
Ingo Molnar | 750ed1a | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 636 | entry->t = ftrace_now(raw_smp_processor_id()); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 637 | entry->flags = (irqs_disabled_flags(flags) ? TRACE_FLAG_IRQS_OFF : 0) | |
| 638 | ((pc & HARDIRQ_MASK) ? TRACE_FLAG_HARDIRQ : 0) | |
| 639 | ((pc & SOFTIRQ_MASK) ? TRACE_FLAG_SOFTIRQ : 0) | |
| 640 | (need_resched() ? TRACE_FLAG_NEED_RESCHED : 0); |
| 641 | } |
| 642 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame^] | 643 | void |
Steven Rostedt | 6fb44b7 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 644 | trace_function(struct trace_array *tr, struct trace_array_cpu *data, |
| 645 | unsigned long ip, unsigned long parent_ip, unsigned long flags) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 646 | { |
| 647 | struct trace_entry *entry; |
Ingo Molnar | dcb6308 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 648 | unsigned long irq_flags; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 649 | |
Ingo Molnar | dcb6308 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 650 | spin_lock_irqsave(&data->lock, irq_flags); |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 651 | entry = tracing_get_trace_entry(tr, data); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 652 | tracing_generic_entry_update(entry, flags); |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 653 | entry->type = TRACE_FN; |
| 654 | entry->fn.ip = ip; |
| 655 | entry->fn.parent_ip = parent_ip; |
Ingo Molnar | dcb6308 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 656 | spin_unlock_irqrestore(&data->lock, irq_flags); |
Soeren Sandmann Pedersen | 2a2cc8f | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 657 | |
| 658 | if (!(trace_flags & TRACE_ITER_BLOCK)) |
| 659 | wake_up (&trace_wait); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 660 | } |
| 661 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame^] | 662 | void |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 663 | ftrace(struct trace_array *tr, struct trace_array_cpu *data, |
| 664 | unsigned long ip, unsigned long parent_ip, unsigned long flags) |
| 665 | { |
| 666 | if (likely(!atomic_read(&data->disabled))) |
Steven Rostedt | 6fb44b7 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 667 | trace_function(tr, data, ip, parent_ip, flags); |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 668 | } |
| 669 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame^] | 670 | void |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 671 | trace_special(struct trace_array *tr, struct trace_array_cpu *data, |
| 672 | unsigned long arg1, unsigned long arg2, unsigned long arg3) |
| 673 | { |
| 674 | struct trace_entry *entry; |
Ingo Molnar | dcb6308 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 675 | unsigned long irq_flags; |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 676 | |
Ingo Molnar | dcb6308 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 677 | spin_lock_irqsave(&data->lock, irq_flags); |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 678 | entry = tracing_get_trace_entry(tr, data); |
| 679 | tracing_generic_entry_update(entry, 0); |
| 680 | entry->type = TRACE_SPECIAL; |
| 681 | entry->special.arg1 = arg1; |
| 682 | entry->special.arg2 = arg2; |
| 683 | entry->special.arg3 = arg3; |
Ingo Molnar | dcb6308 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 684 | spin_unlock_irqrestore(&data->lock, irq_flags); |
Soeren Sandmann Pedersen | 2a2cc8f | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 685 | |
| 686 | if (!(trace_flags & TRACE_ITER_BLOCK)) |
| 687 | wake_up (&trace_wait); |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 688 | } |
| 689 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame^] | 690 | void |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 691 | tracing_sched_switch_trace(struct trace_array *tr, |
| 692 | struct trace_array_cpu *data, |
| 693 | struct task_struct *prev, struct task_struct *next, |
| 694 | unsigned long flags) |
| 695 | { |
| 696 | struct trace_entry *entry; |
Ingo Molnar | dcb6308 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 697 | unsigned long irq_flags; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 698 | |
Ingo Molnar | dcb6308 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 699 | spin_lock_irqsave(&data->lock, irq_flags); |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 700 | entry = tracing_get_trace_entry(tr, data); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 701 | tracing_generic_entry_update(entry, flags); |
| 702 | entry->type = TRACE_CTX; |
| 703 | entry->ctx.prev_pid = prev->pid; |
| 704 | entry->ctx.prev_prio = prev->prio; |
| 705 | entry->ctx.prev_state = prev->state; |
| 706 | entry->ctx.next_pid = next->pid; |
| 707 | entry->ctx.next_prio = next->prio; |
Ingo Molnar | dcb6308 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 708 | spin_unlock_irqrestore(&data->lock, irq_flags); |
Soeren Sandmann Pedersen | 2a2cc8f | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 709 | |
| 710 | if (!(trace_flags & TRACE_ITER_BLOCK)) |
| 711 | wake_up (&trace_wait); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 712 | } |
| 713 | |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 714 | #ifdef CONFIG_FTRACE |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame^] | 715 | static void |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 716 | function_trace_call(unsigned long ip, unsigned long parent_ip) |
| 717 | { |
| 718 | struct trace_array *tr = &global_trace; |
| 719 | struct trace_array_cpu *data; |
| 720 | unsigned long flags; |
| 721 | long disabled; |
| 722 | int cpu; |
| 723 | |
| 724 | if (unlikely(!tracer_enabled)) |
| 725 | return; |
| 726 | |
| 727 | local_irq_save(flags); |
| 728 | cpu = raw_smp_processor_id(); |
| 729 | data = tr->data[cpu]; |
| 730 | disabled = atomic_inc_return(&data->disabled); |
| 731 | |
| 732 | if (likely(disabled == 1)) |
Steven Rostedt | 6fb44b7 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 733 | trace_function(tr, data, ip, parent_ip, flags); |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 734 | |
| 735 | atomic_dec(&data->disabled); |
| 736 | local_irq_restore(flags); |
| 737 | } |
| 738 | |
| 739 | static struct ftrace_ops trace_ops __read_mostly = |
| 740 | { |
| 741 | .func = function_trace_call, |
| 742 | }; |
| 743 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame^] | 744 | void tracing_start_function_trace(void) |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 745 | { |
| 746 | register_ftrace_function(&trace_ops); |
| 747 | } |
| 748 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame^] | 749 | void tracing_stop_function_trace(void) |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 750 | { |
| 751 | unregister_ftrace_function(&trace_ops); |
| 752 | } |
| 753 | #endif |
| 754 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 755 | enum trace_file_type { |
| 756 | TRACE_FILE_LAT_FMT = 1, |
| 757 | }; |
| 758 | |
| 759 | static struct trace_entry * |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 760 | trace_entry_idx(struct trace_array *tr, struct trace_array_cpu *data, |
| 761 | struct trace_iterator *iter, int cpu) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 762 | { |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 763 | struct page *page; |
| 764 | struct trace_entry *array; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 765 | |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 766 | if (iter->next_idx[cpu] >= tr->entries || |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 767 | iter->next_idx[cpu] >= data->trace_idx || |
| 768 | (data->trace_head == data->trace_tail && |
| 769 | data->trace_head_idx == data->trace_tail_idx)) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 770 | return NULL; |
| 771 | |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 772 | if (!iter->next_page[cpu]) { |
Steven Rostedt | 93a588f | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 773 | /* Initialize the iterator for this cpu trace buffer */ |
| 774 | WARN_ON(!data->trace_tail); |
| 775 | page = virt_to_page(data->trace_tail); |
| 776 | iter->next_page[cpu] = &page->lru; |
| 777 | iter->next_page_idx[cpu] = data->trace_tail_idx; |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 778 | } |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 779 | |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 780 | page = list_entry(iter->next_page[cpu], struct page, lru); |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 781 | BUG_ON(&data->trace_pages == &page->lru); |
| 782 | |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 783 | array = page_address(page); |
| 784 | |
Steven Rostedt | 93a588f | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 785 | WARN_ON(iter->next_page_idx[cpu] >= ENTRIES_PER_PAGE); |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 786 | return &array[iter->next_page_idx[cpu]]; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 787 | } |
| 788 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame^] | 789 | static struct trace_entry * |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 790 | find_next_entry(struct trace_iterator *iter, int *ent_cpu) |
| 791 | { |
| 792 | struct trace_array *tr = iter->tr; |
| 793 | struct trace_entry *ent, *next = NULL; |
| 794 | int next_cpu = -1; |
| 795 | int cpu; |
| 796 | |
| 797 | for_each_possible_cpu(cpu) { |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 798 | if (!head_page(tr->data[cpu])) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 799 | continue; |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 800 | ent = trace_entry_idx(tr, tr->data[cpu], iter, cpu); |
Ingo Molnar | cdd31cd | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 801 | /* |
| 802 | * Pick the entry with the smallest timestamp: |
| 803 | */ |
| 804 | if (ent && (!next || ent->t < next->t)) { |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 805 | next = ent; |
| 806 | next_cpu = cpu; |
| 807 | } |
| 808 | } |
| 809 | |
| 810 | if (ent_cpu) |
| 811 | *ent_cpu = next_cpu; |
| 812 | |
| 813 | return next; |
| 814 | } |
| 815 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame^] | 816 | static void trace_iterator_increment(struct trace_iterator *iter) |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 817 | { |
| 818 | iter->idx++; |
| 819 | iter->next_idx[iter->cpu]++; |
| 820 | iter->next_page_idx[iter->cpu]++; |
Ingo Molnar | 8c523a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 821 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 822 | if (iter->next_page_idx[iter->cpu] >= ENTRIES_PER_PAGE) { |
| 823 | struct trace_array_cpu *data = iter->tr->data[iter->cpu]; |
| 824 | |
| 825 | iter->next_page_idx[iter->cpu] = 0; |
| 826 | iter->next_page[iter->cpu] = |
| 827 | trace_next_list(data, iter->next_page[iter->cpu]); |
| 828 | } |
| 829 | } |
| 830 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame^] | 831 | static void trace_consume(struct trace_iterator *iter) |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 832 | { |
| 833 | struct trace_array_cpu *data = iter->tr->data[iter->cpu]; |
| 834 | |
| 835 | data->trace_tail_idx++; |
| 836 | if (data->trace_tail_idx >= ENTRIES_PER_PAGE) { |
| 837 | data->trace_tail = trace_next_page(data, data->trace_tail); |
| 838 | data->trace_tail_idx = 0; |
| 839 | } |
| 840 | |
| 841 | /* Check if we empty it, then reset the index */ |
| 842 | if (data->trace_head == data->trace_tail && |
| 843 | data->trace_head_idx == data->trace_tail_idx) |
| 844 | data->trace_idx = 0; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 845 | } |
| 846 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame^] | 847 | static void *find_next_entry_inc(struct trace_iterator *iter) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 848 | { |
| 849 | struct trace_entry *next; |
| 850 | int next_cpu = -1; |
| 851 | |
| 852 | next = find_next_entry(iter, &next_cpu); |
| 853 | |
Ingo Molnar | 4e3c333 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 854 | iter->prev_ent = iter->ent; |
| 855 | iter->prev_cpu = iter->cpu; |
| 856 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 857 | iter->ent = next; |
| 858 | iter->cpu = next_cpu; |
| 859 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 860 | if (next) |
| 861 | trace_iterator_increment(iter); |
| 862 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 863 | return next ? iter : NULL; |
| 864 | } |
| 865 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame^] | 866 | 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] | 867 | { |
| 868 | struct trace_iterator *iter = m->private; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 869 | void *last_ent = iter->ent; |
| 870 | int i = (int)*pos; |
Ingo Molnar | 4e3c333 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 871 | void *ent; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 872 | |
| 873 | (*pos)++; |
| 874 | |
| 875 | /* can't go backwards */ |
| 876 | if (iter->idx > i) |
| 877 | return NULL; |
| 878 | |
| 879 | if (iter->idx < 0) |
| 880 | ent = find_next_entry_inc(iter); |
| 881 | else |
| 882 | ent = iter; |
| 883 | |
| 884 | while (ent && iter->idx < i) |
| 885 | ent = find_next_entry_inc(iter); |
| 886 | |
| 887 | iter->pos = *pos; |
| 888 | |
| 889 | if (last_ent && !ent) |
| 890 | seq_puts(m, "\n\nvim:ft=help\n"); |
| 891 | |
| 892 | return ent; |
| 893 | } |
| 894 | |
| 895 | static void *s_start(struct seq_file *m, loff_t *pos) |
| 896 | { |
| 897 | struct trace_iterator *iter = m->private; |
| 898 | void *p = NULL; |
| 899 | loff_t l = 0; |
| 900 | int i; |
| 901 | |
| 902 | mutex_lock(&trace_types_lock); |
| 903 | |
| 904 | if (!current_trace || current_trace != iter->trace) |
| 905 | return NULL; |
| 906 | |
| 907 | atomic_inc(&trace_record_cmdline_disabled); |
| 908 | |
| 909 | /* let the tracer grab locks here if needed */ |
| 910 | if (current_trace->start) |
| 911 | current_trace->start(iter); |
| 912 | |
| 913 | if (*pos != iter->pos) { |
| 914 | iter->ent = NULL; |
| 915 | iter->cpu = 0; |
| 916 | iter->idx = -1; |
Ingo Molnar | 4e3c333 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 917 | iter->prev_ent = NULL; |
| 918 | iter->prev_cpu = -1; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 919 | |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 920 | for_each_possible_cpu(i) { |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 921 | iter->next_idx[i] = 0; |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 922 | iter->next_page[i] = NULL; |
| 923 | } |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 924 | |
| 925 | for (p = iter; p && l < *pos; p = s_next(m, p, &l)) |
| 926 | ; |
| 927 | |
| 928 | } else { |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 929 | l = *pos - 1; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 930 | p = s_next(m, p, &l); |
| 931 | } |
| 932 | |
| 933 | return p; |
| 934 | } |
| 935 | |
| 936 | static void s_stop(struct seq_file *m, void *p) |
| 937 | { |
| 938 | struct trace_iterator *iter = m->private; |
| 939 | |
| 940 | atomic_dec(&trace_record_cmdline_disabled); |
| 941 | |
| 942 | /* let the tracer release locks here if needed */ |
| 943 | if (current_trace && current_trace == iter->trace && iter->trace->stop) |
| 944 | iter->trace->stop(iter); |
| 945 | |
| 946 | mutex_unlock(&trace_types_lock); |
| 947 | } |
| 948 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 949 | static int |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 950 | 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] | 951 | { |
| 952 | #ifdef CONFIG_KALLSYMS |
| 953 | char str[KSYM_SYMBOL_LEN]; |
| 954 | |
| 955 | kallsyms_lookup(address, NULL, NULL, NULL, str); |
| 956 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 957 | return trace_seq_printf(s, fmt, str); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 958 | #endif |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 959 | return 1; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 960 | } |
| 961 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 962 | static int |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 963 | seq_print_sym_offset(struct trace_seq *s, const char *fmt, |
| 964 | unsigned long address) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 965 | { |
| 966 | #ifdef CONFIG_KALLSYMS |
| 967 | char str[KSYM_SYMBOL_LEN]; |
| 968 | |
| 969 | sprint_symbol(str, address); |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 970 | return trace_seq_printf(s, fmt, str); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 971 | #endif |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 972 | return 1; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 973 | } |
| 974 | |
| 975 | #ifndef CONFIG_64BIT |
| 976 | # define IP_FMT "%08lx" |
| 977 | #else |
| 978 | # define IP_FMT "%016lx" |
| 979 | #endif |
| 980 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame^] | 981 | static int |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 982 | 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] | 983 | { |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 984 | int ret; |
| 985 | |
| 986 | if (!ip) |
| 987 | return trace_seq_printf(s, "0"); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 988 | |
| 989 | if (sym_flags & TRACE_ITER_SYM_OFFSET) |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 990 | ret = seq_print_sym_offset(s, "%s", ip); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 991 | else |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 992 | ret = seq_print_sym_short(s, "%s", ip); |
| 993 | |
| 994 | if (!ret) |
| 995 | return 0; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 996 | |
| 997 | if (sym_flags & TRACE_ITER_SYM_ADDR) |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 998 | ret = trace_seq_printf(s, " <" IP_FMT ">", ip); |
| 999 | return ret; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1000 | } |
| 1001 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame^] | 1002 | static void print_lat_help_header(struct seq_file *m) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1003 | { |
| 1004 | seq_puts(m, "# _------=> CPU# \n"); |
| 1005 | seq_puts(m, "# / _-----=> irqs-off \n"); |
| 1006 | seq_puts(m, "# | / _----=> need-resched \n"); |
| 1007 | seq_puts(m, "# || / _---=> hardirq/softirq \n"); |
| 1008 | seq_puts(m, "# ||| / _--=> preempt-depth \n"); |
| 1009 | seq_puts(m, "# |||| / \n"); |
| 1010 | seq_puts(m, "# ||||| delay \n"); |
| 1011 | seq_puts(m, "# cmd pid ||||| time | caller \n"); |
| 1012 | seq_puts(m, "# \\ / ||||| \\ | / \n"); |
| 1013 | } |
| 1014 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame^] | 1015 | static void print_func_help_header(struct seq_file *m) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1016 | { |
| 1017 | seq_puts(m, "# TASK-PID CPU# TIMESTAMP FUNCTION\n"); |
| 1018 | seq_puts(m, "# | | | | |\n"); |
| 1019 | } |
| 1020 | |
| 1021 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame^] | 1022 | static void |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1023 | print_trace_header(struct seq_file *m, struct trace_iterator *iter) |
| 1024 | { |
| 1025 | unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK); |
| 1026 | struct trace_array *tr = iter->tr; |
| 1027 | struct trace_array_cpu *data = tr->data[tr->cpu]; |
| 1028 | struct tracer *type = current_trace; |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1029 | unsigned long total = 0; |
| 1030 | unsigned long entries = 0; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1031 | int cpu; |
| 1032 | const char *name = "preemption"; |
| 1033 | |
| 1034 | if (type) |
| 1035 | name = type->name; |
| 1036 | |
| 1037 | for_each_possible_cpu(cpu) { |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 1038 | if (head_page(tr->data[cpu])) { |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1039 | total += tr->data[cpu]->trace_idx; |
| 1040 | if (tr->data[cpu]->trace_idx > tr->entries) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1041 | entries += tr->entries; |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1042 | else |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1043 | entries += tr->data[cpu]->trace_idx; |
| 1044 | } |
| 1045 | } |
| 1046 | |
| 1047 | seq_printf(m, "%s latency trace v1.1.5 on %s\n", |
| 1048 | name, UTS_RELEASE); |
| 1049 | seq_puts(m, "-----------------------------------" |
| 1050 | "---------------------------------\n"); |
| 1051 | seq_printf(m, " latency: %lu us, #%lu/%lu, CPU#%d |" |
| 1052 | " (M:%s VP:%d, KP:%d, SP:%d HP:%d", |
Steven Rostedt | 57f50be | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 1053 | nsecs_to_usecs(data->saved_latency), |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1054 | entries, |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1055 | total, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1056 | tr->cpu, |
| 1057 | #if defined(CONFIG_PREEMPT_NONE) |
| 1058 | "server", |
| 1059 | #elif defined(CONFIG_PREEMPT_VOLUNTARY) |
| 1060 | "desktop", |
| 1061 | #elif defined(CONFIG_PREEMPT_DESKTOP) |
| 1062 | "preempt", |
| 1063 | #else |
| 1064 | "unknown", |
| 1065 | #endif |
| 1066 | /* These are reserved for later use */ |
| 1067 | 0, 0, 0, 0); |
| 1068 | #ifdef CONFIG_SMP |
| 1069 | seq_printf(m, " #P:%d)\n", num_online_cpus()); |
| 1070 | #else |
| 1071 | seq_puts(m, ")\n"); |
| 1072 | #endif |
| 1073 | seq_puts(m, " -----------------\n"); |
| 1074 | seq_printf(m, " | task: %.16s-%d " |
| 1075 | "(uid:%d nice:%ld policy:%ld rt_prio:%ld)\n", |
| 1076 | data->comm, data->pid, data->uid, data->nice, |
| 1077 | data->policy, data->rt_priority); |
| 1078 | seq_puts(m, " -----------------\n"); |
| 1079 | |
| 1080 | if (data->critical_start) { |
| 1081 | seq_puts(m, " => started at: "); |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1082 | seq_print_ip_sym(&iter->seq, data->critical_start, sym_flags); |
| 1083 | trace_print_seq(m, &iter->seq); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1084 | seq_puts(m, "\n => ended at: "); |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1085 | seq_print_ip_sym(&iter->seq, data->critical_end, sym_flags); |
| 1086 | trace_print_seq(m, &iter->seq); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1087 | seq_puts(m, "\n"); |
| 1088 | } |
| 1089 | |
| 1090 | seq_puts(m, "\n"); |
| 1091 | } |
| 1092 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame^] | 1093 | static void |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1094 | 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] | 1095 | { |
| 1096 | int hardirq, softirq; |
| 1097 | char *comm; |
| 1098 | |
| 1099 | comm = trace_find_cmdline(entry->pid); |
| 1100 | |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1101 | trace_seq_printf(s, "%8.8s-%-5d ", comm, entry->pid); |
| 1102 | trace_seq_printf(s, "%d", cpu); |
| 1103 | trace_seq_printf(s, "%c%c", |
| 1104 | (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' : '.', |
| 1105 | ((entry->flags & TRACE_FLAG_NEED_RESCHED) ? 'N' : '.')); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1106 | |
| 1107 | hardirq = entry->flags & TRACE_FLAG_HARDIRQ; |
| 1108 | softirq = entry->flags & TRACE_FLAG_SOFTIRQ; |
| 1109 | if (hardirq && softirq) |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1110 | trace_seq_putc(s, 'H'); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1111 | else { |
| 1112 | if (hardirq) |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1113 | trace_seq_putc(s, 'h'); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1114 | else { |
| 1115 | if (softirq) |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1116 | trace_seq_putc(s, 's'); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1117 | else |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1118 | trace_seq_putc(s, '.'); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1119 | } |
| 1120 | } |
| 1121 | |
| 1122 | if (entry->preempt_count) |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1123 | trace_seq_printf(s, "%x", entry->preempt_count); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1124 | else |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1125 | trace_seq_puts(s, "."); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1126 | } |
| 1127 | |
| 1128 | unsigned long preempt_mark_thresh = 100; |
| 1129 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame^] | 1130 | static void |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1131 | lat_print_timestamp(struct trace_seq *s, unsigned long long abs_usecs, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1132 | unsigned long rel_usecs) |
| 1133 | { |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1134 | trace_seq_printf(s, " %4lldus", abs_usecs); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1135 | if (rel_usecs > preempt_mark_thresh) |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1136 | trace_seq_puts(s, "!: "); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1137 | else if (rel_usecs > 1) |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1138 | trace_seq_puts(s, "+: "); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1139 | else |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1140 | trace_seq_puts(s, " : "); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1141 | } |
| 1142 | |
| 1143 | static const char state_to_char[] = TASK_STATE_TO_CHAR_STR; |
| 1144 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame^] | 1145 | static int |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1146 | 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] | 1147 | { |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1148 | struct trace_seq *s = &iter->seq; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1149 | unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK); |
| 1150 | struct trace_entry *next_entry = find_next_entry(iter, NULL); |
| 1151 | unsigned long verbose = (trace_flags & TRACE_ITER_VERBOSE); |
| 1152 | struct trace_entry *entry = iter->ent; |
| 1153 | unsigned long abs_usecs; |
| 1154 | unsigned long rel_usecs; |
| 1155 | char *comm; |
| 1156 | int S; |
| 1157 | |
| 1158 | if (!next_entry) |
| 1159 | next_entry = entry; |
| 1160 | rel_usecs = ns2usecs(next_entry->t - entry->t); |
| 1161 | abs_usecs = ns2usecs(entry->t - iter->tr->time_start); |
| 1162 | |
| 1163 | if (verbose) { |
| 1164 | comm = trace_find_cmdline(entry->pid); |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1165 | trace_seq_printf(s, "%16s %5d %d %d %08x %08x [%08lx]" |
| 1166 | " %ld.%03ldms (+%ld.%03ldms): ", |
| 1167 | comm, |
| 1168 | entry->pid, cpu, entry->flags, |
| 1169 | entry->preempt_count, trace_idx, |
| 1170 | ns2usecs(entry->t), |
| 1171 | abs_usecs/1000, |
| 1172 | abs_usecs % 1000, rel_usecs/1000, |
| 1173 | rel_usecs % 1000); |
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 | lat_print_generic(s, entry, cpu); |
| 1176 | lat_print_timestamp(s, abs_usecs, rel_usecs); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1177 | } |
| 1178 | switch (entry->type) { |
| 1179 | case TRACE_FN: |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1180 | seq_print_ip_sym(s, entry->fn.ip, sym_flags); |
| 1181 | trace_seq_puts(s, " ("); |
| 1182 | seq_print_ip_sym(s, entry->fn.parent_ip, sym_flags); |
| 1183 | trace_seq_puts(s, ")\n"); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1184 | break; |
| 1185 | case TRACE_CTX: |
| 1186 | S = entry->ctx.prev_state < sizeof(state_to_char) ? |
| 1187 | state_to_char[entry->ctx.prev_state] : 'X'; |
| 1188 | comm = trace_find_cmdline(entry->ctx.next_pid); |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1189 | trace_seq_printf(s, " %d:%d:%c --> %d:%d %s\n", |
| 1190 | entry->ctx.prev_pid, |
| 1191 | entry->ctx.prev_prio, |
| 1192 | S, |
| 1193 | entry->ctx.next_pid, |
| 1194 | entry->ctx.next_prio, |
| 1195 | comm); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1196 | break; |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1197 | case TRACE_SPECIAL: |
| 1198 | trace_seq_printf(s, " %lx %lx %lx\n", |
| 1199 | entry->special.arg1, |
| 1200 | entry->special.arg2, |
| 1201 | entry->special.arg3); |
| 1202 | break; |
Steven Rostedt | 89b2f97 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 1203 | default: |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1204 | trace_seq_printf(s, "Unknown type %d\n", entry->type); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1205 | } |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1206 | return 1; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1207 | } |
| 1208 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame^] | 1209 | static int print_trace_fmt(struct trace_iterator *iter) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1210 | { |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1211 | struct trace_seq *s = &iter->seq; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1212 | unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK); |
Ingo Molnar | 4e3c333 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 1213 | struct trace_entry *entry; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1214 | unsigned long usec_rem; |
| 1215 | unsigned long long t; |
| 1216 | unsigned long secs; |
| 1217 | char *comm; |
| 1218 | int S; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1219 | int ret; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1220 | |
Ingo Molnar | 4e3c333 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 1221 | entry = iter->ent; |
| 1222 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1223 | comm = trace_find_cmdline(iter->ent->pid); |
| 1224 | |
Ingo Molnar | cdd31cd | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1225 | t = ns2usecs(entry->t); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1226 | usec_rem = do_div(t, 1000000ULL); |
| 1227 | secs = (unsigned long)t; |
| 1228 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1229 | ret = trace_seq_printf(s, "%16s-%-5d ", comm, entry->pid); |
| 1230 | if (!ret) |
| 1231 | return 0; |
| 1232 | ret = trace_seq_printf(s, "[%02d] ", iter->cpu); |
| 1233 | if (!ret) |
| 1234 | return 0; |
| 1235 | ret = trace_seq_printf(s, "%5lu.%06lu: ", secs, usec_rem); |
| 1236 | if (!ret) |
| 1237 | return 0; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1238 | |
| 1239 | switch (entry->type) { |
| 1240 | case TRACE_FN: |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1241 | ret = seq_print_ip_sym(s, entry->fn.ip, sym_flags); |
| 1242 | if (!ret) |
| 1243 | return 0; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1244 | if ((sym_flags & TRACE_ITER_PRINT_PARENT) && |
| 1245 | entry->fn.parent_ip) { |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1246 | ret = trace_seq_printf(s, " <-"); |
| 1247 | if (!ret) |
| 1248 | return 0; |
| 1249 | ret = seq_print_ip_sym(s, entry->fn.parent_ip, |
| 1250 | sym_flags); |
| 1251 | if (!ret) |
| 1252 | return 0; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1253 | } |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1254 | ret = trace_seq_printf(s, "\n"); |
| 1255 | if (!ret) |
| 1256 | return 0; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1257 | break; |
| 1258 | case TRACE_CTX: |
| 1259 | S = entry->ctx.prev_state < sizeof(state_to_char) ? |
| 1260 | state_to_char[entry->ctx.prev_state] : 'X'; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1261 | ret = trace_seq_printf(s, " %d:%d:%c ==> %d:%d\n", |
| 1262 | entry->ctx.prev_pid, |
| 1263 | entry->ctx.prev_prio, |
| 1264 | S, |
| 1265 | entry->ctx.next_pid, |
| 1266 | entry->ctx.next_prio); |
| 1267 | if (!ret) |
| 1268 | return 0; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1269 | break; |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1270 | case TRACE_SPECIAL: |
| 1271 | ret = trace_seq_printf(s, " %lx %lx %lx\n", |
| 1272 | entry->special.arg1, |
| 1273 | entry->special.arg2, |
| 1274 | entry->special.arg3); |
| 1275 | if (!ret) |
| 1276 | return 0; |
| 1277 | break; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1278 | } |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1279 | return 1; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1280 | } |
| 1281 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame^] | 1282 | static int print_raw_fmt(struct trace_iterator *iter) |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1283 | { |
| 1284 | struct trace_seq *s = &iter->seq; |
| 1285 | struct trace_entry *entry; |
| 1286 | int ret; |
| 1287 | int S; |
| 1288 | |
| 1289 | entry = iter->ent; |
| 1290 | |
| 1291 | ret = trace_seq_printf(s, "%d %d %llu ", |
| 1292 | entry->pid, iter->cpu, entry->t); |
| 1293 | if (!ret) |
| 1294 | return 0; |
| 1295 | |
| 1296 | switch (entry->type) { |
| 1297 | case TRACE_FN: |
| 1298 | ret = trace_seq_printf(s, "%x %x\n", |
| 1299 | entry->fn.ip, entry->fn.parent_ip); |
| 1300 | if (!ret) |
| 1301 | return 0; |
| 1302 | break; |
| 1303 | case TRACE_CTX: |
| 1304 | S = entry->ctx.prev_state < sizeof(state_to_char) ? |
| 1305 | state_to_char[entry->ctx.prev_state] : 'X'; |
| 1306 | ret = trace_seq_printf(s, "%d %d %c %d %d\n", |
| 1307 | entry->ctx.prev_pid, |
| 1308 | entry->ctx.prev_prio, |
| 1309 | S, |
| 1310 | entry->ctx.next_pid, |
| 1311 | entry->ctx.next_prio); |
| 1312 | if (!ret) |
| 1313 | return 0; |
| 1314 | break; |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1315 | case TRACE_SPECIAL: |
| 1316 | ret = trace_seq_printf(s, " %lx %lx %lx\n", |
| 1317 | entry->special.arg1, |
| 1318 | entry->special.arg2, |
| 1319 | entry->special.arg3); |
| 1320 | if (!ret) |
| 1321 | return 0; |
| 1322 | break; |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1323 | } |
| 1324 | return 1; |
| 1325 | } |
| 1326 | |
Ingo Molnar | cb0f12a | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1327 | #define SEQ_PUT_FIELD_RET(s, x) \ |
| 1328 | do { \ |
| 1329 | if (!trace_seq_putmem(s, &(x), sizeof(x))) \ |
| 1330 | return 0; \ |
| 1331 | } while (0) |
| 1332 | |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1333 | #define SEQ_PUT_HEX_FIELD_RET(s, x) \ |
| 1334 | do { \ |
| 1335 | if (!trace_seq_putmem_hex(s, &(x), sizeof(x))) \ |
| 1336 | return 0; \ |
| 1337 | } while (0) |
| 1338 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame^] | 1339 | static int print_hex_fmt(struct trace_iterator *iter) |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1340 | { |
| 1341 | struct trace_seq *s = &iter->seq; |
| 1342 | unsigned char newline = '\n'; |
| 1343 | struct trace_entry *entry; |
| 1344 | int S; |
| 1345 | |
| 1346 | entry = iter->ent; |
| 1347 | |
| 1348 | SEQ_PUT_HEX_FIELD_RET(s, entry->pid); |
| 1349 | SEQ_PUT_HEX_FIELD_RET(s, iter->cpu); |
| 1350 | SEQ_PUT_HEX_FIELD_RET(s, entry->t); |
| 1351 | |
| 1352 | switch (entry->type) { |
| 1353 | case TRACE_FN: |
| 1354 | SEQ_PUT_HEX_FIELD_RET(s, entry->fn.ip); |
| 1355 | SEQ_PUT_HEX_FIELD_RET(s, entry->fn.parent_ip); |
| 1356 | break; |
| 1357 | case TRACE_CTX: |
| 1358 | S = entry->ctx.prev_state < sizeof(state_to_char) ? |
| 1359 | state_to_char[entry->ctx.prev_state] : 'X'; |
| 1360 | SEQ_PUT_HEX_FIELD_RET(s, entry->ctx.prev_pid); |
| 1361 | SEQ_PUT_HEX_FIELD_RET(s, entry->ctx.prev_prio); |
| 1362 | SEQ_PUT_HEX_FIELD_RET(s, S); |
| 1363 | SEQ_PUT_HEX_FIELD_RET(s, entry->ctx.next_pid); |
| 1364 | SEQ_PUT_HEX_FIELD_RET(s, entry->ctx.next_prio); |
| 1365 | SEQ_PUT_HEX_FIELD_RET(s, entry->fn.parent_ip); |
| 1366 | break; |
| 1367 | case TRACE_SPECIAL: |
| 1368 | SEQ_PUT_HEX_FIELD_RET(s, entry->special.arg1); |
| 1369 | SEQ_PUT_HEX_FIELD_RET(s, entry->special.arg2); |
| 1370 | SEQ_PUT_HEX_FIELD_RET(s, entry->special.arg3); |
| 1371 | break; |
| 1372 | } |
| 1373 | SEQ_PUT_FIELD_RET(s, newline); |
| 1374 | |
| 1375 | return 1; |
| 1376 | } |
| 1377 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame^] | 1378 | static int print_bin_fmt(struct trace_iterator *iter) |
Ingo Molnar | cb0f12a | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1379 | { |
| 1380 | struct trace_seq *s = &iter->seq; |
| 1381 | struct trace_entry *entry; |
| 1382 | |
| 1383 | entry = iter->ent; |
| 1384 | |
| 1385 | SEQ_PUT_FIELD_RET(s, entry->pid); |
| 1386 | SEQ_PUT_FIELD_RET(s, entry->cpu); |
| 1387 | SEQ_PUT_FIELD_RET(s, entry->t); |
| 1388 | |
| 1389 | switch (entry->type) { |
| 1390 | case TRACE_FN: |
| 1391 | SEQ_PUT_FIELD_RET(s, entry->fn.ip); |
| 1392 | SEQ_PUT_FIELD_RET(s, entry->fn.parent_ip); |
| 1393 | break; |
| 1394 | case TRACE_CTX: |
| 1395 | SEQ_PUT_FIELD_RET(s, entry->ctx.prev_pid); |
| 1396 | SEQ_PUT_FIELD_RET(s, entry->ctx.prev_prio); |
| 1397 | SEQ_PUT_FIELD_RET(s, entry->ctx.prev_state); |
| 1398 | SEQ_PUT_FIELD_RET(s, entry->ctx.next_pid); |
| 1399 | SEQ_PUT_FIELD_RET(s, entry->ctx.next_prio); |
| 1400 | break; |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1401 | case TRACE_SPECIAL: |
| 1402 | SEQ_PUT_FIELD_RET(s, entry->special.arg1); |
| 1403 | SEQ_PUT_FIELD_RET(s, entry->special.arg2); |
| 1404 | SEQ_PUT_FIELD_RET(s, entry->special.arg3); |
| 1405 | break; |
Ingo Molnar | cb0f12a | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1406 | } |
| 1407 | return 1; |
| 1408 | } |
| 1409 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1410 | static int trace_empty(struct trace_iterator *iter) |
| 1411 | { |
| 1412 | struct trace_array_cpu *data; |
| 1413 | int cpu; |
| 1414 | |
| 1415 | for_each_possible_cpu(cpu) { |
| 1416 | data = iter->tr->data[cpu]; |
| 1417 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1418 | if (head_page(data) && data->trace_idx && |
| 1419 | (data->trace_tail != data->trace_head || |
| 1420 | data->trace_tail_idx != data->trace_head_idx)) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1421 | return 0; |
| 1422 | } |
| 1423 | return 1; |
| 1424 | } |
| 1425 | |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1426 | static int print_trace_line(struct trace_iterator *iter) |
| 1427 | { |
Ingo Molnar | cb0f12a | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1428 | if (trace_flags & TRACE_ITER_BIN) |
| 1429 | return print_bin_fmt(iter); |
| 1430 | |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1431 | if (trace_flags & TRACE_ITER_HEX) |
| 1432 | return print_hex_fmt(iter); |
| 1433 | |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1434 | if (trace_flags & TRACE_ITER_RAW) |
| 1435 | return print_raw_fmt(iter); |
| 1436 | |
| 1437 | if (iter->iter_flags & TRACE_FILE_LAT_FMT) |
| 1438 | return print_lat_fmt(iter, iter->idx, iter->cpu); |
| 1439 | |
| 1440 | return print_trace_fmt(iter); |
| 1441 | } |
| 1442 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1443 | static int s_show(struct seq_file *m, void *v) |
| 1444 | { |
| 1445 | struct trace_iterator *iter = v; |
| 1446 | |
| 1447 | if (iter->ent == NULL) { |
| 1448 | if (iter->tr) { |
| 1449 | seq_printf(m, "# tracer: %s\n", iter->trace->name); |
| 1450 | seq_puts(m, "#\n"); |
| 1451 | } |
| 1452 | if (iter->iter_flags & TRACE_FILE_LAT_FMT) { |
| 1453 | /* print nothing if the buffers are empty */ |
| 1454 | if (trace_empty(iter)) |
| 1455 | return 0; |
| 1456 | print_trace_header(m, iter); |
| 1457 | if (!(trace_flags & TRACE_ITER_VERBOSE)) |
| 1458 | print_lat_help_header(m); |
| 1459 | } else { |
| 1460 | if (!(trace_flags & TRACE_ITER_VERBOSE)) |
| 1461 | print_func_help_header(m); |
| 1462 | } |
| 1463 | } else { |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1464 | print_trace_line(iter); |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1465 | trace_print_seq(m, &iter->seq); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1466 | } |
| 1467 | |
| 1468 | return 0; |
| 1469 | } |
| 1470 | |
| 1471 | static struct seq_operations tracer_seq_ops = { |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1472 | .start = s_start, |
| 1473 | .next = s_next, |
| 1474 | .stop = s_stop, |
| 1475 | .show = s_show, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1476 | }; |
| 1477 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame^] | 1478 | static struct trace_iterator * |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1479 | __tracing_open(struct inode *inode, struct file *file, int *ret) |
| 1480 | { |
| 1481 | struct trace_iterator *iter; |
| 1482 | |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 1483 | if (tracing_disabled) { |
| 1484 | *ret = -ENODEV; |
| 1485 | return NULL; |
| 1486 | } |
| 1487 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1488 | iter = kzalloc(sizeof(*iter), GFP_KERNEL); |
| 1489 | if (!iter) { |
| 1490 | *ret = -ENOMEM; |
| 1491 | goto out; |
| 1492 | } |
| 1493 | |
| 1494 | mutex_lock(&trace_types_lock); |
| 1495 | if (current_trace && current_trace->print_max) |
| 1496 | iter->tr = &max_tr; |
| 1497 | else |
| 1498 | iter->tr = inode->i_private; |
| 1499 | iter->trace = current_trace; |
| 1500 | iter->pos = -1; |
| 1501 | |
| 1502 | /* TODO stop tracer */ |
| 1503 | *ret = seq_open(file, &tracer_seq_ops); |
| 1504 | if (!*ret) { |
| 1505 | struct seq_file *m = file->private_data; |
| 1506 | m->private = iter; |
| 1507 | |
| 1508 | /* stop the trace while dumping */ |
| 1509 | if (iter->tr->ctrl) |
| 1510 | tracer_enabled = 0; |
| 1511 | |
| 1512 | if (iter->trace && iter->trace->open) |
| 1513 | iter->trace->open(iter); |
| 1514 | } else { |
| 1515 | kfree(iter); |
| 1516 | iter = NULL; |
| 1517 | } |
| 1518 | mutex_unlock(&trace_types_lock); |
| 1519 | |
| 1520 | out: |
| 1521 | return iter; |
| 1522 | } |
| 1523 | |
| 1524 | int tracing_open_generic(struct inode *inode, struct file *filp) |
| 1525 | { |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 1526 | if (tracing_disabled) |
| 1527 | return -ENODEV; |
| 1528 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1529 | filp->private_data = inode->i_private; |
| 1530 | return 0; |
| 1531 | } |
| 1532 | |
| 1533 | int tracing_release(struct inode *inode, struct file *file) |
| 1534 | { |
| 1535 | struct seq_file *m = (struct seq_file *)file->private_data; |
| 1536 | struct trace_iterator *iter = m->private; |
| 1537 | |
| 1538 | mutex_lock(&trace_types_lock); |
| 1539 | if (iter->trace && iter->trace->close) |
| 1540 | iter->trace->close(iter); |
| 1541 | |
| 1542 | /* reenable tracing if it was previously enabled */ |
| 1543 | if (iter->tr->ctrl) |
| 1544 | tracer_enabled = 1; |
| 1545 | mutex_unlock(&trace_types_lock); |
| 1546 | |
| 1547 | seq_release(inode, file); |
| 1548 | kfree(iter); |
| 1549 | return 0; |
| 1550 | } |
| 1551 | |
| 1552 | static int tracing_open(struct inode *inode, struct file *file) |
| 1553 | { |
| 1554 | int ret; |
| 1555 | |
| 1556 | __tracing_open(inode, file, &ret); |
| 1557 | |
| 1558 | return ret; |
| 1559 | } |
| 1560 | |
| 1561 | static int tracing_lt_open(struct inode *inode, struct file *file) |
| 1562 | { |
| 1563 | struct trace_iterator *iter; |
| 1564 | int ret; |
| 1565 | |
| 1566 | iter = __tracing_open(inode, file, &ret); |
| 1567 | |
| 1568 | if (!ret) |
| 1569 | iter->iter_flags |= TRACE_FILE_LAT_FMT; |
| 1570 | |
| 1571 | return ret; |
| 1572 | } |
| 1573 | |
| 1574 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame^] | 1575 | static void * |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1576 | t_next(struct seq_file *m, void *v, loff_t *pos) |
| 1577 | { |
| 1578 | struct tracer *t = m->private; |
| 1579 | |
| 1580 | (*pos)++; |
| 1581 | |
| 1582 | if (t) |
| 1583 | t = t->next; |
| 1584 | |
| 1585 | m->private = t; |
| 1586 | |
| 1587 | return t; |
| 1588 | } |
| 1589 | |
| 1590 | static void *t_start(struct seq_file *m, loff_t *pos) |
| 1591 | { |
| 1592 | struct tracer *t = m->private; |
| 1593 | loff_t l = 0; |
| 1594 | |
| 1595 | mutex_lock(&trace_types_lock); |
| 1596 | for (; t && l < *pos; t = t_next(m, t, &l)) |
| 1597 | ; |
| 1598 | |
| 1599 | return t; |
| 1600 | } |
| 1601 | |
| 1602 | static void t_stop(struct seq_file *m, void *p) |
| 1603 | { |
| 1604 | mutex_unlock(&trace_types_lock); |
| 1605 | } |
| 1606 | |
| 1607 | static int t_show(struct seq_file *m, void *v) |
| 1608 | { |
| 1609 | struct tracer *t = v; |
| 1610 | |
| 1611 | if (!t) |
| 1612 | return 0; |
| 1613 | |
| 1614 | seq_printf(m, "%s", t->name); |
| 1615 | if (t->next) |
| 1616 | seq_putc(m, ' '); |
| 1617 | else |
| 1618 | seq_putc(m, '\n'); |
| 1619 | |
| 1620 | return 0; |
| 1621 | } |
| 1622 | |
| 1623 | static struct seq_operations show_traces_seq_ops = { |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1624 | .start = t_start, |
| 1625 | .next = t_next, |
| 1626 | .stop = t_stop, |
| 1627 | .show = t_show, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1628 | }; |
| 1629 | |
| 1630 | static int show_traces_open(struct inode *inode, struct file *file) |
| 1631 | { |
| 1632 | int ret; |
| 1633 | |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 1634 | if (tracing_disabled) |
| 1635 | return -ENODEV; |
| 1636 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1637 | ret = seq_open(file, &show_traces_seq_ops); |
| 1638 | if (!ret) { |
| 1639 | struct seq_file *m = file->private_data; |
| 1640 | m->private = trace_types; |
| 1641 | } |
| 1642 | |
| 1643 | return ret; |
| 1644 | } |
| 1645 | |
| 1646 | static struct file_operations tracing_fops = { |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1647 | .open = tracing_open, |
| 1648 | .read = seq_read, |
| 1649 | .llseek = seq_lseek, |
| 1650 | .release = tracing_release, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1651 | }; |
| 1652 | |
| 1653 | static struct file_operations tracing_lt_fops = { |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1654 | .open = tracing_lt_open, |
| 1655 | .read = seq_read, |
| 1656 | .llseek = seq_lseek, |
| 1657 | .release = tracing_release, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1658 | }; |
| 1659 | |
| 1660 | static struct file_operations show_traces_fops = { |
| 1661 | .open = show_traces_open, |
| 1662 | .read = seq_read, |
| 1663 | .release = seq_release, |
| 1664 | }; |
| 1665 | |
| 1666 | static ssize_t |
| 1667 | tracing_iter_ctrl_read(struct file *filp, char __user *ubuf, |
| 1668 | size_t cnt, loff_t *ppos) |
| 1669 | { |
| 1670 | char *buf; |
| 1671 | int r = 0; |
| 1672 | int len = 0; |
| 1673 | int i; |
| 1674 | |
| 1675 | /* calulate max size */ |
| 1676 | for (i = 0; trace_options[i]; i++) { |
| 1677 | len += strlen(trace_options[i]); |
| 1678 | len += 3; /* "no" and space */ |
| 1679 | } |
| 1680 | |
| 1681 | /* +2 for \n and \0 */ |
| 1682 | buf = kmalloc(len + 2, GFP_KERNEL); |
| 1683 | if (!buf) |
| 1684 | return -ENOMEM; |
| 1685 | |
| 1686 | for (i = 0; trace_options[i]; i++) { |
| 1687 | if (trace_flags & (1 << i)) |
| 1688 | r += sprintf(buf + r, "%s ", trace_options[i]); |
| 1689 | else |
| 1690 | r += sprintf(buf + r, "no%s ", trace_options[i]); |
| 1691 | } |
| 1692 | |
| 1693 | r += sprintf(buf + r, "\n"); |
| 1694 | WARN_ON(r >= len + 2); |
| 1695 | |
| 1696 | r = simple_read_from_buffer(ubuf, cnt, ppos, |
| 1697 | buf, r); |
| 1698 | |
| 1699 | kfree(buf); |
| 1700 | |
| 1701 | return r; |
| 1702 | } |
| 1703 | |
| 1704 | static ssize_t |
| 1705 | tracing_iter_ctrl_write(struct file *filp, const char __user *ubuf, |
| 1706 | size_t cnt, loff_t *ppos) |
| 1707 | { |
| 1708 | char buf[64]; |
| 1709 | char *cmp = buf; |
| 1710 | int neg = 0; |
| 1711 | int i; |
| 1712 | |
| 1713 | if (cnt > 63) |
| 1714 | cnt = 63; |
| 1715 | |
| 1716 | if (copy_from_user(&buf, ubuf, cnt)) |
| 1717 | return -EFAULT; |
| 1718 | |
| 1719 | buf[cnt] = 0; |
| 1720 | |
| 1721 | if (strncmp(buf, "no", 2) == 0) { |
| 1722 | neg = 1; |
| 1723 | cmp += 2; |
| 1724 | } |
| 1725 | |
| 1726 | for (i = 0; trace_options[i]; i++) { |
| 1727 | int len = strlen(trace_options[i]); |
| 1728 | |
| 1729 | if (strncmp(cmp, trace_options[i], len) == 0) { |
| 1730 | if (neg) |
| 1731 | trace_flags &= ~(1 << i); |
| 1732 | else |
| 1733 | trace_flags |= (1 << i); |
| 1734 | break; |
| 1735 | } |
| 1736 | } |
| 1737 | |
| 1738 | filp->f_pos += cnt; |
| 1739 | |
| 1740 | return cnt; |
| 1741 | } |
| 1742 | |
| 1743 | static struct file_operations tracing_iter_fops = { |
| 1744 | .open = tracing_open_generic, |
| 1745 | .read = tracing_iter_ctrl_read, |
| 1746 | .write = tracing_iter_ctrl_write, |
| 1747 | }; |
| 1748 | |
Ingo Molnar | 7bd2f24 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 1749 | static const char readme_msg[] = |
| 1750 | "tracing mini-HOWTO:\n\n" |
| 1751 | "# mkdir /debug\n" |
| 1752 | "# mount -t debugfs nodev /debug\n\n" |
| 1753 | "# cat /debug/tracing/available_tracers\n" |
| 1754 | "wakeup preemptirqsoff preemptoff irqsoff ftrace sched_switch none\n\n" |
| 1755 | "# cat /debug/tracing/current_tracer\n" |
| 1756 | "none\n" |
| 1757 | "# echo sched_switch > /debug/tracing/current_tracer\n" |
| 1758 | "# cat /debug/tracing/current_tracer\n" |
| 1759 | "sched_switch\n" |
| 1760 | "# cat /debug/tracing/iter_ctrl\n" |
| 1761 | "noprint-parent nosym-offset nosym-addr noverbose\n" |
| 1762 | "# echo print-parent > /debug/tracing/iter_ctrl\n" |
| 1763 | "# echo 1 > /debug/tracing/tracing_enabled\n" |
| 1764 | "# cat /debug/tracing/trace > /tmp/trace.txt\n" |
| 1765 | "echo 0 > /debug/tracing/tracing_enabled\n" |
| 1766 | ; |
| 1767 | |
| 1768 | static ssize_t |
| 1769 | tracing_readme_read(struct file *filp, char __user *ubuf, |
| 1770 | size_t cnt, loff_t *ppos) |
| 1771 | { |
| 1772 | return simple_read_from_buffer(ubuf, cnt, ppos, |
| 1773 | readme_msg, strlen(readme_msg)); |
| 1774 | } |
| 1775 | |
| 1776 | static struct file_operations tracing_readme_fops = { |
| 1777 | .open = tracing_open_generic, |
| 1778 | .read = tracing_readme_read, |
| 1779 | }; |
| 1780 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1781 | static ssize_t |
| 1782 | tracing_ctrl_read(struct file *filp, char __user *ubuf, |
| 1783 | size_t cnt, loff_t *ppos) |
| 1784 | { |
| 1785 | struct trace_array *tr = filp->private_data; |
| 1786 | char buf[64]; |
| 1787 | int r; |
| 1788 | |
| 1789 | r = sprintf(buf, "%ld\n", tr->ctrl); |
Ingo Molnar | 4e3c333 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 1790 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1791 | } |
| 1792 | |
| 1793 | static ssize_t |
| 1794 | tracing_ctrl_write(struct file *filp, const char __user *ubuf, |
| 1795 | size_t cnt, loff_t *ppos) |
| 1796 | { |
| 1797 | struct trace_array *tr = filp->private_data; |
| 1798 | long val; |
| 1799 | char buf[64]; |
| 1800 | |
| 1801 | if (cnt > 63) |
| 1802 | cnt = 63; |
| 1803 | |
| 1804 | if (copy_from_user(&buf, ubuf, cnt)) |
| 1805 | return -EFAULT; |
| 1806 | |
| 1807 | buf[cnt] = 0; |
| 1808 | |
| 1809 | val = simple_strtoul(buf, NULL, 10); |
| 1810 | |
| 1811 | val = !!val; |
| 1812 | |
| 1813 | mutex_lock(&trace_types_lock); |
| 1814 | if (tr->ctrl ^ val) { |
| 1815 | if (val) |
| 1816 | tracer_enabled = 1; |
| 1817 | else |
| 1818 | tracer_enabled = 0; |
| 1819 | |
| 1820 | tr->ctrl = val; |
| 1821 | |
| 1822 | if (current_trace && current_trace->ctrl_update) |
| 1823 | current_trace->ctrl_update(tr); |
| 1824 | } |
| 1825 | mutex_unlock(&trace_types_lock); |
| 1826 | |
| 1827 | filp->f_pos += cnt; |
| 1828 | |
| 1829 | return cnt; |
| 1830 | } |
| 1831 | |
| 1832 | static ssize_t |
| 1833 | tracing_set_trace_read(struct file *filp, char __user *ubuf, |
| 1834 | size_t cnt, loff_t *ppos) |
| 1835 | { |
| 1836 | char buf[max_tracer_type_len+2]; |
| 1837 | int r; |
| 1838 | |
| 1839 | mutex_lock(&trace_types_lock); |
| 1840 | if (current_trace) |
| 1841 | r = sprintf(buf, "%s\n", current_trace->name); |
| 1842 | else |
| 1843 | r = sprintf(buf, "\n"); |
| 1844 | mutex_unlock(&trace_types_lock); |
| 1845 | |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1846 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1847 | } |
| 1848 | |
| 1849 | static ssize_t |
| 1850 | tracing_set_trace_write(struct file *filp, const char __user *ubuf, |
| 1851 | size_t cnt, loff_t *ppos) |
| 1852 | { |
| 1853 | struct trace_array *tr = &global_trace; |
| 1854 | struct tracer *t; |
| 1855 | char buf[max_tracer_type_len+1]; |
| 1856 | int i; |
| 1857 | |
| 1858 | if (cnt > max_tracer_type_len) |
| 1859 | cnt = max_tracer_type_len; |
| 1860 | |
| 1861 | if (copy_from_user(&buf, ubuf, cnt)) |
| 1862 | return -EFAULT; |
| 1863 | |
| 1864 | buf[cnt] = 0; |
| 1865 | |
| 1866 | /* strip ending whitespace. */ |
| 1867 | for (i = cnt - 1; i > 0 && isspace(buf[i]); i--) |
| 1868 | buf[i] = 0; |
| 1869 | |
| 1870 | mutex_lock(&trace_types_lock); |
| 1871 | for (t = trace_types; t; t = t->next) { |
| 1872 | if (strcmp(t->name, buf) == 0) |
| 1873 | break; |
| 1874 | } |
| 1875 | if (!t || t == current_trace) |
| 1876 | goto out; |
| 1877 | |
| 1878 | if (current_trace && current_trace->reset) |
| 1879 | current_trace->reset(tr); |
| 1880 | |
| 1881 | current_trace = t; |
| 1882 | if (t->init) |
| 1883 | t->init(tr); |
| 1884 | |
| 1885 | out: |
| 1886 | mutex_unlock(&trace_types_lock); |
| 1887 | |
| 1888 | filp->f_pos += cnt; |
| 1889 | |
| 1890 | return cnt; |
| 1891 | } |
| 1892 | |
| 1893 | static ssize_t |
| 1894 | tracing_max_lat_read(struct file *filp, char __user *ubuf, |
| 1895 | size_t cnt, loff_t *ppos) |
| 1896 | { |
| 1897 | unsigned long *ptr = filp->private_data; |
| 1898 | char buf[64]; |
| 1899 | int r; |
| 1900 | |
| 1901 | r = snprintf(buf, 64, "%ld\n", |
| 1902 | *ptr == (unsigned long)-1 ? -1 : nsecs_to_usecs(*ptr)); |
| 1903 | if (r > 64) |
| 1904 | r = 64; |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1905 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1906 | } |
| 1907 | |
| 1908 | static ssize_t |
| 1909 | tracing_max_lat_write(struct file *filp, const char __user *ubuf, |
| 1910 | size_t cnt, loff_t *ppos) |
| 1911 | { |
| 1912 | long *ptr = filp->private_data; |
| 1913 | long val; |
| 1914 | char buf[64]; |
| 1915 | |
| 1916 | if (cnt > 63) |
| 1917 | cnt = 63; |
| 1918 | |
| 1919 | if (copy_from_user(&buf, ubuf, cnt)) |
| 1920 | return -EFAULT; |
| 1921 | |
| 1922 | buf[cnt] = 0; |
| 1923 | |
| 1924 | val = simple_strtoul(buf, NULL, 10); |
| 1925 | |
| 1926 | *ptr = val * 1000; |
| 1927 | |
| 1928 | return cnt; |
| 1929 | } |
| 1930 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1931 | static atomic_t tracing_reader; |
| 1932 | |
| 1933 | static int tracing_open_pipe(struct inode *inode, struct file *filp) |
| 1934 | { |
| 1935 | struct trace_iterator *iter; |
| 1936 | |
| 1937 | if (tracing_disabled) |
| 1938 | return -ENODEV; |
| 1939 | |
| 1940 | /* We only allow for reader of the pipe */ |
| 1941 | if (atomic_inc_return(&tracing_reader) != 1) { |
| 1942 | atomic_dec(&tracing_reader); |
| 1943 | return -EBUSY; |
| 1944 | } |
| 1945 | |
| 1946 | /* create a buffer to store the information to pass to userspace */ |
| 1947 | iter = kzalloc(sizeof(*iter), GFP_KERNEL); |
| 1948 | if (!iter) |
| 1949 | return -ENOMEM; |
| 1950 | |
| 1951 | iter->tr = &global_trace; |
| 1952 | |
| 1953 | filp->private_data = iter; |
| 1954 | |
| 1955 | return 0; |
| 1956 | } |
| 1957 | |
| 1958 | static int tracing_release_pipe(struct inode *inode, struct file *file) |
| 1959 | { |
| 1960 | struct trace_iterator *iter = file->private_data; |
| 1961 | |
| 1962 | kfree(iter); |
| 1963 | atomic_dec(&tracing_reader); |
| 1964 | |
| 1965 | return 0; |
| 1966 | } |
| 1967 | |
Soeren Sandmann Pedersen | 2a2cc8f | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1968 | static unsigned int |
| 1969 | tracing_poll_pipe(struct file *filp, poll_table *poll_table) |
| 1970 | { |
| 1971 | struct trace_iterator *iter = filp->private_data; |
| 1972 | |
| 1973 | if (trace_flags & TRACE_ITER_BLOCK) { |
| 1974 | /* |
| 1975 | * Always select as readable when in blocking mode |
| 1976 | */ |
| 1977 | return POLLIN | POLLRDNORM; |
| 1978 | } |
| 1979 | else { |
| 1980 | if (!trace_empty(iter)) |
| 1981 | return POLLIN | POLLRDNORM; |
| 1982 | poll_wait(filp, &trace_wait, poll_table); |
| 1983 | if (!trace_empty(iter)) |
| 1984 | return POLLIN | POLLRDNORM; |
| 1985 | |
| 1986 | return 0; |
| 1987 | } |
| 1988 | } |
| 1989 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1990 | /* |
| 1991 | * Consumer reader. |
| 1992 | */ |
| 1993 | static ssize_t |
| 1994 | tracing_read_pipe(struct file *filp, char __user *ubuf, |
| 1995 | size_t cnt, loff_t *ppos) |
| 1996 | { |
| 1997 | struct trace_iterator *iter = filp->private_data; |
| 1998 | struct trace_array_cpu *data; |
| 1999 | static cpumask_t mask; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2000 | static int start; |
| 2001 | unsigned long flags; |
Ingo Molnar | 2577046 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2002 | #ifdef CONFIG_FTRACE |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2003 | int ftrace_save; |
Ingo Molnar | 2577046 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2004 | #endif |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2005 | int read = 0; |
| 2006 | int cpu; |
| 2007 | int len; |
| 2008 | int ret; |
| 2009 | |
| 2010 | /* return any leftover data */ |
| 2011 | if (iter->seq.len > start) { |
| 2012 | len = iter->seq.len - start; |
| 2013 | if (cnt > len) |
| 2014 | cnt = len; |
| 2015 | ret = copy_to_user(ubuf, iter->seq.buffer + start, cnt); |
| 2016 | if (ret) |
| 2017 | cnt = -EFAULT; |
| 2018 | |
| 2019 | start += len; |
| 2020 | |
| 2021 | return cnt; |
| 2022 | } |
| 2023 | |
| 2024 | trace_seq_reset(&iter->seq); |
| 2025 | start = 0; |
| 2026 | |
| 2027 | while (trace_empty(iter)) { |
Soeren Sandmann Pedersen | 2a2cc8f | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2028 | if (!(trace_flags & TRACE_ITER_BLOCK)) |
| 2029 | return -EWOULDBLOCK; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2030 | /* |
| 2031 | * This is a make-shift waitqueue. The reason we don't use |
| 2032 | * an actual wait queue is because: |
| 2033 | * 1) we only ever have one waiter |
| 2034 | * 2) the tracing, traces all functions, we don't want |
| 2035 | * the overhead of calling wake_up and friends |
| 2036 | * (and tracing them too) |
| 2037 | * Anyway, this is really very primitive wakeup. |
| 2038 | */ |
| 2039 | set_current_state(TASK_INTERRUPTIBLE); |
| 2040 | iter->tr->waiter = current; |
| 2041 | |
| 2042 | /* sleep for one second, and try again. */ |
| 2043 | schedule_timeout(HZ); |
| 2044 | |
| 2045 | iter->tr->waiter = NULL; |
| 2046 | |
| 2047 | if (signal_pending(current)) |
| 2048 | return -EINTR; |
| 2049 | |
| 2050 | /* |
| 2051 | * We block until we read something and tracing is disabled. |
| 2052 | * We still block if tracing is disabled, but we have never |
| 2053 | * read anything. This allows a user to cat this file, and |
| 2054 | * then enable tracing. But after we have read something, |
| 2055 | * we give an EOF when tracing is again disabled. |
| 2056 | * |
| 2057 | * iter->pos will be 0 if we haven't read anything. |
| 2058 | */ |
| 2059 | if (!tracer_enabled && iter->pos) |
| 2060 | break; |
| 2061 | |
| 2062 | continue; |
| 2063 | } |
| 2064 | |
| 2065 | /* stop when tracing is finished */ |
| 2066 | if (trace_empty(iter)) |
| 2067 | return 0; |
| 2068 | |
| 2069 | if (cnt >= PAGE_SIZE) |
| 2070 | cnt = PAGE_SIZE - 1; |
| 2071 | |
| 2072 | memset(iter, 0, sizeof(*iter)); |
| 2073 | iter->tr = &global_trace; |
| 2074 | iter->pos = -1; |
| 2075 | |
| 2076 | /* |
| 2077 | * We need to stop all tracing on all CPUS to read the |
| 2078 | * the next buffer. This is a bit expensive, but is |
| 2079 | * not done often. We fill all what we can read, |
| 2080 | * and then release the locks again. |
| 2081 | */ |
| 2082 | |
| 2083 | cpus_clear(mask); |
| 2084 | local_irq_save(flags); |
Ingo Molnar | 2577046 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2085 | #ifdef CONFIG_FTRACE |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2086 | ftrace_save = ftrace_enabled; |
| 2087 | ftrace_enabled = 0; |
Ingo Molnar | 2577046 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2088 | #endif |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2089 | smp_wmb(); |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2090 | for_each_possible_cpu(cpu) { |
| 2091 | data = iter->tr->data[cpu]; |
| 2092 | |
| 2093 | if (!head_page(data) || !data->trace_idx) |
| 2094 | continue; |
| 2095 | |
| 2096 | atomic_inc(&data->disabled); |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2097 | cpu_set(cpu, mask); |
| 2098 | } |
| 2099 | |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2100 | for_each_cpu_mask(cpu, mask) { |
| 2101 | data = iter->tr->data[cpu]; |
| 2102 | spin_lock(&data->lock); |
| 2103 | } |
| 2104 | |
Steven Rostedt | 088b1e42 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 2105 | while (find_next_entry_inc(iter) != NULL) { |
| 2106 | int len = iter->seq.len; |
| 2107 | |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 2108 | ret = print_trace_line(iter); |
Steven Rostedt | 088b1e42 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 2109 | if (!ret) { |
| 2110 | /* don't print partial lines */ |
| 2111 | iter->seq.len = len; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2112 | break; |
Steven Rostedt | 088b1e42 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 2113 | } |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2114 | |
| 2115 | trace_consume(iter); |
| 2116 | |
| 2117 | if (iter->seq.len >= cnt) |
| 2118 | break; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2119 | } |
| 2120 | |
Ingo Molnar | d4c5a2f | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2121 | for_each_cpu_mask(cpu, mask) { |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2122 | data = iter->tr->data[cpu]; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2123 | spin_unlock(&data->lock); |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2124 | } |
| 2125 | |
| 2126 | for_each_cpu_mask(cpu, mask) { |
| 2127 | data = iter->tr->data[cpu]; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2128 | atomic_dec(&data->disabled); |
| 2129 | } |
Ingo Molnar | 2577046 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2130 | #ifdef CONFIG_FTRACE |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2131 | ftrace_enabled = ftrace_save; |
Ingo Molnar | 2577046 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2132 | #endif |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2133 | local_irq_restore(flags); |
| 2134 | |
| 2135 | /* Now copy what we have to the user */ |
| 2136 | read = iter->seq.len; |
| 2137 | if (read > cnt) |
| 2138 | read = cnt; |
| 2139 | |
| 2140 | ret = copy_to_user(ubuf, iter->seq.buffer, read); |
| 2141 | |
| 2142 | if (read < iter->seq.len) |
| 2143 | start = read; |
| 2144 | else |
| 2145 | trace_seq_reset(&iter->seq); |
| 2146 | |
| 2147 | if (ret) |
| 2148 | read = -EFAULT; |
| 2149 | |
| 2150 | return read; |
| 2151 | } |
| 2152 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2153 | static struct file_operations tracing_max_lat_fops = { |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2154 | .open = tracing_open_generic, |
| 2155 | .read = tracing_max_lat_read, |
| 2156 | .write = tracing_max_lat_write, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2157 | }; |
| 2158 | |
| 2159 | static struct file_operations tracing_ctrl_fops = { |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2160 | .open = tracing_open_generic, |
| 2161 | .read = tracing_ctrl_read, |
| 2162 | .write = tracing_ctrl_write, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2163 | }; |
| 2164 | |
| 2165 | static struct file_operations set_tracer_fops = { |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2166 | .open = tracing_open_generic, |
| 2167 | .read = tracing_set_trace_read, |
| 2168 | .write = tracing_set_trace_write, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2169 | }; |
| 2170 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2171 | static struct file_operations tracing_pipe_fops = { |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2172 | .open = tracing_open_pipe, |
Soeren Sandmann Pedersen | 2a2cc8f | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2173 | .poll = tracing_poll_pipe, |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2174 | .read = tracing_read_pipe, |
| 2175 | .release = tracing_release_pipe, |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2176 | }; |
| 2177 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2178 | #ifdef CONFIG_DYNAMIC_FTRACE |
| 2179 | |
| 2180 | static ssize_t |
| 2181 | tracing_read_long(struct file *filp, char __user *ubuf, |
| 2182 | size_t cnt, loff_t *ppos) |
| 2183 | { |
| 2184 | unsigned long *p = filp->private_data; |
| 2185 | char buf[64]; |
| 2186 | int r; |
| 2187 | |
| 2188 | r = sprintf(buf, "%ld\n", *p); |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2189 | |
| 2190 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2191 | } |
| 2192 | |
| 2193 | static struct file_operations tracing_read_long_fops = { |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2194 | .open = tracing_open_generic, |
| 2195 | .read = tracing_read_long, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2196 | }; |
| 2197 | #endif |
| 2198 | |
| 2199 | static struct dentry *d_tracer; |
| 2200 | |
| 2201 | struct dentry *tracing_init_dentry(void) |
| 2202 | { |
| 2203 | static int once; |
| 2204 | |
| 2205 | if (d_tracer) |
| 2206 | return d_tracer; |
| 2207 | |
| 2208 | d_tracer = debugfs_create_dir("tracing", NULL); |
| 2209 | |
| 2210 | if (!d_tracer && !once) { |
| 2211 | once = 1; |
| 2212 | pr_warning("Could not create debugfs directory 'tracing'\n"); |
| 2213 | return NULL; |
| 2214 | } |
| 2215 | |
| 2216 | return d_tracer; |
| 2217 | } |
| 2218 | |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 2219 | #ifdef CONFIG_FTRACE_SELFTEST |
| 2220 | /* Let selftest have access to static functions in this file */ |
| 2221 | #include "trace_selftest.c" |
| 2222 | #endif |
| 2223 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2224 | static __init void tracer_init_debugfs(void) |
| 2225 | { |
| 2226 | struct dentry *d_tracer; |
| 2227 | struct dentry *entry; |
| 2228 | |
| 2229 | d_tracer = tracing_init_dentry(); |
| 2230 | |
| 2231 | entry = debugfs_create_file("tracing_enabled", 0644, d_tracer, |
| 2232 | &global_trace, &tracing_ctrl_fops); |
| 2233 | if (!entry) |
| 2234 | pr_warning("Could not create debugfs 'tracing_enabled' entry\n"); |
| 2235 | |
| 2236 | entry = debugfs_create_file("iter_ctrl", 0644, d_tracer, |
| 2237 | NULL, &tracing_iter_fops); |
| 2238 | if (!entry) |
| 2239 | pr_warning("Could not create debugfs 'iter_ctrl' entry\n"); |
| 2240 | |
| 2241 | entry = debugfs_create_file("latency_trace", 0444, d_tracer, |
| 2242 | &global_trace, &tracing_lt_fops); |
| 2243 | if (!entry) |
| 2244 | pr_warning("Could not create debugfs 'latency_trace' entry\n"); |
| 2245 | |
| 2246 | entry = debugfs_create_file("trace", 0444, d_tracer, |
| 2247 | &global_trace, &tracing_fops); |
| 2248 | if (!entry) |
| 2249 | pr_warning("Could not create debugfs 'trace' entry\n"); |
| 2250 | |
| 2251 | entry = debugfs_create_file("available_tracers", 0444, d_tracer, |
| 2252 | &global_trace, &show_traces_fops); |
| 2253 | if (!entry) |
| 2254 | pr_warning("Could not create debugfs 'trace' entry\n"); |
| 2255 | |
| 2256 | entry = debugfs_create_file("current_tracer", 0444, d_tracer, |
| 2257 | &global_trace, &set_tracer_fops); |
| 2258 | if (!entry) |
| 2259 | pr_warning("Could not create debugfs 'trace' entry\n"); |
| 2260 | |
| 2261 | entry = debugfs_create_file("tracing_max_latency", 0644, d_tracer, |
| 2262 | &tracing_max_latency, |
| 2263 | &tracing_max_lat_fops); |
| 2264 | if (!entry) |
| 2265 | pr_warning("Could not create debugfs " |
| 2266 | "'tracing_max_latency' entry\n"); |
| 2267 | |
| 2268 | entry = debugfs_create_file("tracing_thresh", 0644, d_tracer, |
| 2269 | &tracing_thresh, &tracing_max_lat_fops); |
| 2270 | if (!entry) |
| 2271 | pr_warning("Could not create debugfs " |
| 2272 | "'tracing_threash' entry\n"); |
Ingo Molnar | 7bd2f24 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 2273 | entry = debugfs_create_file("README", 0644, d_tracer, |
| 2274 | NULL, &tracing_readme_fops); |
| 2275 | if (!entry) |
| 2276 | pr_warning("Could not create debugfs 'README' entry\n"); |
| 2277 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2278 | entry = debugfs_create_file("trace_pipe", 0644, d_tracer, |
| 2279 | NULL, &tracing_pipe_fops); |
| 2280 | if (!entry) |
| 2281 | pr_warning("Could not create debugfs " |
| 2282 | "'tracing_threash' entry\n"); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2283 | |
| 2284 | #ifdef CONFIG_DYNAMIC_FTRACE |
| 2285 | entry = debugfs_create_file("dyn_ftrace_total_info", 0444, d_tracer, |
| 2286 | &ftrace_update_tot_cnt, |
| 2287 | &tracing_read_long_fops); |
| 2288 | if (!entry) |
| 2289 | pr_warning("Could not create debugfs " |
| 2290 | "'dyn_ftrace_total_info' entry\n"); |
| 2291 | #endif |
| 2292 | } |
| 2293 | |
| 2294 | /* dummy trace to disable tracing */ |
| 2295 | static struct tracer no_tracer __read_mostly = |
| 2296 | { |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2297 | .name = "none", |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2298 | }; |
| 2299 | |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2300 | static int trace_alloc_page(void) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2301 | { |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2302 | struct trace_array_cpu *data; |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2303 | struct page *page, *tmp; |
| 2304 | LIST_HEAD(pages); |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 2305 | void *array; |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2306 | int i; |
| 2307 | |
| 2308 | /* first allocate a page for each CPU */ |
| 2309 | for_each_possible_cpu(i) { |
| 2310 | array = (void *)__get_free_page(GFP_KERNEL); |
| 2311 | if (array == NULL) { |
| 2312 | printk(KERN_ERR "tracer: failed to allocate page" |
| 2313 | "for trace buffer!\n"); |
| 2314 | goto free_pages; |
| 2315 | } |
| 2316 | |
| 2317 | page = virt_to_page(array); |
| 2318 | list_add(&page->lru, &pages); |
| 2319 | |
| 2320 | /* Only allocate if we are actually using the max trace */ |
| 2321 | #ifdef CONFIG_TRACER_MAX_TRACE |
| 2322 | array = (void *)__get_free_page(GFP_KERNEL); |
| 2323 | if (array == NULL) { |
| 2324 | printk(KERN_ERR "tracer: failed to allocate page" |
| 2325 | "for trace buffer!\n"); |
| 2326 | goto free_pages; |
| 2327 | } |
| 2328 | page = virt_to_page(array); |
| 2329 | list_add(&page->lru, &pages); |
| 2330 | #endif |
| 2331 | } |
| 2332 | |
| 2333 | /* Now that we successfully allocate a page per CPU, add them */ |
| 2334 | for_each_possible_cpu(i) { |
| 2335 | data = global_trace.data[i]; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2336 | spin_lock_init(&data->lock); |
Ingo Molnar | d4c5a2f | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2337 | lockdep_set_class(&data->lock, &data->lock_key); |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2338 | page = list_entry(pages.next, struct page, lru); |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 2339 | list_del_init(&page->lru); |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2340 | list_add_tail(&page->lru, &data->trace_pages); |
| 2341 | ClearPageLRU(page); |
| 2342 | |
| 2343 | #ifdef CONFIG_TRACER_MAX_TRACE |
| 2344 | data = max_tr.data[i]; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2345 | spin_lock_init(&data->lock); |
Ingo Molnar | d4c5a2f | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2346 | lockdep_set_class(&data->lock, &data->lock_key); |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2347 | page = list_entry(pages.next, struct page, lru); |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 2348 | list_del_init(&page->lru); |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2349 | list_add_tail(&page->lru, &data->trace_pages); |
| 2350 | SetPageLRU(page); |
| 2351 | #endif |
| 2352 | } |
| 2353 | global_trace.entries += ENTRIES_PER_PAGE; |
| 2354 | |
| 2355 | return 0; |
| 2356 | |
| 2357 | free_pages: |
| 2358 | list_for_each_entry_safe(page, tmp, &pages, lru) { |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 2359 | list_del_init(&page->lru); |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2360 | __free_page(page); |
| 2361 | } |
| 2362 | return -ENOMEM; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2363 | } |
| 2364 | |
| 2365 | __init static int tracer_alloc_buffers(void) |
| 2366 | { |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2367 | struct trace_array_cpu *data; |
| 2368 | void *array; |
| 2369 | struct page *page; |
| 2370 | int pages = 0; |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 2371 | int ret = -ENOMEM; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2372 | int i; |
| 2373 | |
Steven Rostedt | 26994ea | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 2374 | global_trace.ctrl = tracer_enabled; |
| 2375 | |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2376 | /* Allocate the first page for all buffers */ |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2377 | for_each_possible_cpu(i) { |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2378 | data = global_trace.data[i] = &per_cpu(global_trace_cpu, i); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2379 | max_tr.data[i] = &per_cpu(max_data, i); |
| 2380 | |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2381 | array = (void *)__get_free_page(GFP_KERNEL); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2382 | if (array == NULL) { |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2383 | printk(KERN_ERR "tracer: failed to allocate page" |
| 2384 | "for trace buffer!\n"); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2385 | goto free_buffers; |
| 2386 | } |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2387 | |
| 2388 | /* set the array to the list */ |
| 2389 | INIT_LIST_HEAD(&data->trace_pages); |
| 2390 | page = virt_to_page(array); |
| 2391 | list_add(&page->lru, &data->trace_pages); |
| 2392 | /* use the LRU flag to differentiate the two buffers */ |
| 2393 | ClearPageLRU(page); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2394 | |
| 2395 | /* Only allocate if we are actually using the max trace */ |
| 2396 | #ifdef CONFIG_TRACER_MAX_TRACE |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2397 | array = (void *)__get_free_page(GFP_KERNEL); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2398 | if (array == NULL) { |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2399 | printk(KERN_ERR "tracer: failed to allocate page" |
| 2400 | "for trace buffer!\n"); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2401 | goto free_buffers; |
| 2402 | } |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2403 | |
| 2404 | INIT_LIST_HEAD(&max_tr.data[i]->trace_pages); |
| 2405 | page = virt_to_page(array); |
| 2406 | list_add(&page->lru, &max_tr.data[i]->trace_pages); |
| 2407 | SetPageLRU(page); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2408 | #endif |
| 2409 | } |
| 2410 | |
| 2411 | /* |
| 2412 | * Since we allocate by orders of pages, we may be able to |
| 2413 | * round up a bit. |
| 2414 | */ |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2415 | global_trace.entries = ENTRIES_PER_PAGE; |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2416 | pages++; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2417 | |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2418 | while (global_trace.entries < trace_nr_entries) { |
| 2419 | if (trace_alloc_page()) |
| 2420 | break; |
| 2421 | pages++; |
| 2422 | } |
Steven Rostedt | 89b2f97 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 2423 | max_tr.entries = global_trace.entries; |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2424 | |
| 2425 | pr_info("tracer: %d pages allocated for %ld", |
| 2426 | pages, trace_nr_entries); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2427 | pr_info(" entries of %ld bytes\n", (long)TRACE_ENTRY_SIZE); |
| 2428 | pr_info(" actual entries %ld\n", global_trace.entries); |
| 2429 | |
| 2430 | tracer_init_debugfs(); |
| 2431 | |
| 2432 | trace_init_cmdlines(); |
| 2433 | |
| 2434 | register_tracer(&no_tracer); |
| 2435 | current_trace = &no_tracer; |
| 2436 | |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 2437 | /* All seems OK, enable tracing */ |
| 2438 | tracing_disabled = 0; |
| 2439 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2440 | return 0; |
| 2441 | |
| 2442 | free_buffers: |
| 2443 | for (i-- ; i >= 0; i--) { |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2444 | struct page *page, *tmp; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2445 | struct trace_array_cpu *data = global_trace.data[i]; |
| 2446 | |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 2447 | if (data) { |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2448 | list_for_each_entry_safe(page, tmp, |
| 2449 | &data->trace_pages, lru) { |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 2450 | list_del_init(&page->lru); |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2451 | __free_page(page); |
| 2452 | } |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2453 | } |
| 2454 | |
| 2455 | #ifdef CONFIG_TRACER_MAX_TRACE |
| 2456 | data = max_tr.data[i]; |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 2457 | if (data) { |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2458 | list_for_each_entry_safe(page, tmp, |
| 2459 | &data->trace_pages, lru) { |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 2460 | list_del_init(&page->lru); |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2461 | __free_page(page); |
| 2462 | } |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2463 | } |
| 2464 | #endif |
| 2465 | } |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 2466 | return ret; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2467 | } |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 2468 | fs_initcall(tracer_alloc_buffers); |