blob: ff93f8ecba28697b45852ccd950b541bac0507ee [file] [log] [blame]
Ingo Molnarabaff322009-06-02 22:59:57 +02001/*
Ingo Molnarbf9e1872009-06-02 23:37:05 +02002 * builtin-record.c
3 *
4 * Builtin record command: Record the profile of a workload
5 * (or a CPU, or a PID) into the perf.data output file - for
6 * later analysis via perf report.
Ingo Molnarabaff322009-06-02 22:59:57 +02007 */
Ingo Molnar16f762a2009-05-27 09:10:38 +02008#include "builtin.h"
Ingo Molnarbf9e1872009-06-02 23:37:05 +02009
10#include "perf.h"
11
Thomas Gleixner6eda5832009-05-01 18:29:57 +020012#include "util/util.h"
Ingo Molnar0e9b20b2009-05-26 09:17:18 +020013#include "util/parse-options.h"
Ingo Molnar8ad8db32009-05-26 11:10:09 +020014#include "util/parse-events.h"
Arnaldo Carvalho de Meloa0055ae2009-06-01 17:50:19 -030015#include "util/string.h"
Thomas Gleixner6eda5832009-05-01 18:29:57 +020016
Peter Zijlstra7c6a1c62009-06-25 17:05:54 +020017#include "util/header.h"
Frederic Weisbecker66e274f2009-08-12 11:07:25 +020018#include "util/event.h"
Frederic Weisbecker8f288272009-08-16 22:05:48 +020019#include "util/debug.h"
Frederic Weisbecker5f9c39d2009-08-17 16:18:08 +020020#include "util/trace-event.h"
Peter Zijlstra7c6a1c62009-06-25 17:05:54 +020021
Peter Zijlstra97124d52009-06-02 15:52:24 +020022#include <unistd.h>
Peter Zijlstrade9ac072009-04-08 15:01:31 +020023#include <sched.h>
Peter Zijlstrade9ac072009-04-08 15:01:31 +020024
Ingo Molnar0e9b20b2009-05-26 09:17:18 +020025#define ALIGN(x, a) __ALIGN_MASK(x, (typeof(x))(a)-1)
26#define __ALIGN_MASK(x, mask) (((x)+(mask))&~(mask))
Arnaldo Carvalho de Melo1a853e32009-05-14 22:50:46 -030027
Peter Zijlstrade9ac072009-04-08 15:01:31 +020028static int fd[MAX_NR_CPUS][MAX_COUNTERS];
Ingo Molnara21ca2c2009-06-06 09:58:57 +020029
30static long default_interval = 100000;
31
Ingo Molnar3cf165f2009-06-02 23:02:59 +020032static int nr_cpus = 0;
Peter Zijlstrade9ac072009-04-08 15:01:31 +020033static unsigned int page_size;
Ingo Molnar3cf165f2009-06-02 23:02:59 +020034static unsigned int mmap_pages = 128;
Ingo Molnarcf1f4572009-06-05 13:27:02 +020035static int freq = 0;
Peter Zijlstrade9ac072009-04-08 15:01:31 +020036static int output;
Ingo Molnar23ac9cb2009-05-27 09:33:18 +020037static const char *output_name = "perf.data";
Peter Zijlstrade9ac072009-04-08 15:01:31 +020038static int group = 0;
Peter Zijlstra16c8a102009-05-05 17:50:27 +020039static unsigned int realtime_prio = 0;
Frederic Weisbeckerdaac07b2009-08-13 10:27:19 +020040static int raw_samples = 0;
Peter Zijlstra16c8a102009-05-05 17:50:27 +020041static int system_wide = 0;
Jens Axboe0a5ac842009-08-12 11:18:01 +020042static int profile_cpu = -1;
Arnaldo Carvalho de Melo1a853e32009-05-14 22:50:46 -030043static pid_t target_pid = -1;
Peter Zijlstra16c8a102009-05-05 17:50:27 +020044static int inherit = 1;
Peter Zijlstra97124d52009-06-02 15:52:24 +020045static int force = 0;
Ingo Molnarabaff322009-06-02 22:59:57 +020046static int append_file = 0;
Ingo Molnar3efa1cc92009-06-14 15:04:15 +020047static int call_graph = 0;
Peter Zijlstra649c48a2009-06-24 21:12:48 +020048static int inherit_stat = 0;
49static int no_samples = 0;
Anton Blanchard4bba8282009-07-16 15:44:29 +020050static int sample_address = 0;
Peter Zijlstrade9ac072009-04-08 15:01:31 +020051
Ingo Molnara21ca2c2009-06-06 09:58:57 +020052static long samples;
53static struct timeval last_read;
54static struct timeval this_read;
55
Paul Mackerras9cffa8d2009-06-19 22:21:42 +100056static u64 bytes_written;
Ingo Molnara21ca2c2009-06-06 09:58:57 +020057
58static struct pollfd event_array[MAX_NR_CPUS * MAX_COUNTERS];
59
60static int nr_poll;
61static int nr_cpu;
62
Peter Zijlstraf5970552009-06-18 23:22:55 +020063static int file_new = 1;
Peter Zijlstra7c6a1c62009-06-25 17:05:54 +020064
65struct perf_header *header;
Peter Zijlstraf5970552009-06-18 23:22:55 +020066
Ingo Molnara21ca2c2009-06-06 09:58:57 +020067struct mmap_data {
68 int counter;
69 void *base;
70 unsigned int mask;
71 unsigned int prev;
72};
73
74static struct mmap_data mmap_array[MAX_NR_CPUS][MAX_COUNTERS];
75
Peter Zijlstra9d91a6f2009-06-18 11:40:28 +020076static unsigned long mmap_read_head(struct mmap_data *md)
Peter Zijlstrade9ac072009-04-08 15:01:31 +020077{
78 struct perf_counter_mmap_page *pc = md->base;
Peter Zijlstra9d91a6f2009-06-18 11:40:28 +020079 long head;
Peter Zijlstrade9ac072009-04-08 15:01:31 +020080
81 head = pc->data_head;
82 rmb();
83
84 return head;
85}
86
Peter Zijlstra9d91a6f2009-06-18 11:40:28 +020087static void mmap_write_tail(struct mmap_data *md, unsigned long tail)
88{
89 struct perf_counter_mmap_page *pc = md->base;
90
91 /*
92 * ensure all reads are done before we write the tail out.
93 */
94 /* mb(); */
95 pc->data_tail = tail;
96}
97
Peter Zijlstraf5970552009-06-18 23:22:55 +020098static void write_output(void *buf, size_t size)
99{
100 while (size) {
101 int ret = write(output, buf, size);
102
103 if (ret < 0)
104 die("failed to write");
105
106 size -= ret;
107 buf += ret;
108
109 bytes_written += ret;
110 }
111}
112
Peter Zijlstrade9ac072009-04-08 15:01:31 +0200113static void mmap_read(struct mmap_data *md)
114{
115 unsigned int head = mmap_read_head(md);
116 unsigned int old = md->prev;
117 unsigned char *data = md->base + page_size;
118 unsigned long size;
119 void *buf;
120 int diff;
121
122 gettimeofday(&this_read, NULL);
123
124 /*
125 * If we're further behind than half the buffer, there's a chance
Ingo Molnar2debbc82009-06-05 14:29:10 +0200126 * the writer will bite our tail and mess up the samples under us.
Peter Zijlstrade9ac072009-04-08 15:01:31 +0200127 *
128 * If we somehow ended up ahead of the head, we got messed up.
129 *
130 * In either case, truncate and restart at head.
131 */
132 diff = head - old;
Peter Zijlstra9d91a6f2009-06-18 11:40:28 +0200133 if (diff < 0) {
Peter Zijlstrade9ac072009-04-08 15:01:31 +0200134 struct timeval iv;
135 unsigned long msecs;
136
137 timersub(&this_read, &last_read, &iv);
138 msecs = iv.tv_sec*1000 + iv.tv_usec/1000;
139
140 fprintf(stderr, "WARNING: failed to keep up with mmap data."
141 " Last read %lu msecs ago.\n", msecs);
142
143 /*
144 * head points to a known good entry, start there.
145 */
146 old = head;
147 }
148
149 last_read = this_read;
150
151 if (old != head)
Ingo Molnar2debbc82009-06-05 14:29:10 +0200152 samples++;
Peter Zijlstrade9ac072009-04-08 15:01:31 +0200153
154 size = head - old;
155
156 if ((old & md->mask) + size != (head & md->mask)) {
157 buf = &data[old & md->mask];
158 size = md->mask + 1 - (old & md->mask);
159 old += size;
Ingo Molnar021e9f42009-06-03 19:27:19 +0200160
Peter Zijlstraf5970552009-06-18 23:22:55 +0200161 write_output(buf, size);
Peter Zijlstrade9ac072009-04-08 15:01:31 +0200162 }
163
164 buf = &data[old & md->mask];
165 size = head - old;
166 old += size;
Ingo Molnar021e9f42009-06-03 19:27:19 +0200167
Peter Zijlstraf5970552009-06-18 23:22:55 +0200168 write_output(buf, size);
Peter Zijlstrade9ac072009-04-08 15:01:31 +0200169
170 md->prev = old;
Peter Zijlstra9d91a6f2009-06-18 11:40:28 +0200171 mmap_write_tail(md, old);
Peter Zijlstrade9ac072009-04-08 15:01:31 +0200172}
173
174static volatile int done = 0;
Peter Zijlstraf7b7c262009-06-10 15:55:59 +0200175static volatile int signr = -1;
Peter Zijlstrade9ac072009-04-08 15:01:31 +0200176
Peter Zijlstra16c8a102009-05-05 17:50:27 +0200177static void sig_handler(int sig)
Peter Zijlstrade9ac072009-04-08 15:01:31 +0200178{
Peter Zijlstra16c8a102009-05-05 17:50:27 +0200179 done = 1;
Peter Zijlstraf7b7c262009-06-10 15:55:59 +0200180 signr = sig;
181}
182
183static void sig_atexit(void)
184{
185 if (signr == -1)
186 return;
187
188 signal(signr, SIG_DFL);
189 kill(getpid(), signr);
Peter Zijlstrade9ac072009-04-08 15:01:31 +0200190}
191
Arnaldo Carvalho de Melo2a8083f2009-08-11 16:22:00 -0300192static pid_t pid_synthesize_comm_event(pid_t pid, int full)
Arnaldo Carvalho de Melo1a853e32009-05-14 22:50:46 -0300193{
Arnaldo Carvalho de Melo1a853e32009-05-14 22:50:46 -0300194 struct comm_event comm_ev;
Ingo Molnar16f762a2009-05-27 09:10:38 +0200195 char filename[PATH_MAX];
Ingo Molnar16f762a2009-05-27 09:10:38 +0200196 char bf[BUFSIZ];
Arnaldo Carvalho de Melo2a8083f2009-08-11 16:22:00 -0300197 FILE *fp;
198 size_t size = 0;
Peter Zijlstraf70e87d2009-06-02 14:13:24 +0200199 DIR *tasks;
200 struct dirent dirent, *next;
Arnaldo Carvalho de Melo2a8083f2009-08-11 16:22:00 -0300201 pid_t tgid = 0;
Arnaldo Carvalho de Melo1a853e32009-05-14 22:50:46 -0300202
Arnaldo Carvalho de Melo2a8083f2009-08-11 16:22:00 -0300203 snprintf(filename, sizeof(filename), "/proc/%d/status", pid);
Arnaldo Carvalho de Melo1a853e32009-05-14 22:50:46 -0300204
Arnaldo Carvalho de Melo2a8083f2009-08-11 16:22:00 -0300205 fp = fopen(filename, "r");
Arnaldo Carvalho de Melo39e6dd72009-08-14 15:26:32 -0300206 if (fp == NULL) {
Ingo Molnar613d8602009-06-15 08:17:12 +0200207 /*
208 * We raced with a task exiting - just return:
209 */
210 if (verbose)
211 fprintf(stderr, "couldn't open %s\n", filename);
Arnaldo Carvalho de Melo2a8083f2009-08-11 16:22:00 -0300212 return 0;
Arnaldo Carvalho de Melo1a853e32009-05-14 22:50:46 -0300213 }
Arnaldo Carvalho de Melo1a853e32009-05-14 22:50:46 -0300214
Arnaldo Carvalho de Melo1a853e32009-05-14 22:50:46 -0300215 memset(&comm_ev, 0, sizeof(comm_ev));
Arnaldo Carvalho de Melo2a8083f2009-08-11 16:22:00 -0300216 while (!comm_ev.comm[0] || !comm_ev.pid) {
217 if (fgets(bf, sizeof(bf), fp) == NULL)
218 goto out_failure;
Peter Zijlstraf70e87d2009-06-02 14:13:24 +0200219
Arnaldo Carvalho de Melo2a8083f2009-08-11 16:22:00 -0300220 if (memcmp(bf, "Name:", 5) == 0) {
221 char *name = bf + 5;
222 while (*name && isspace(*name))
223 ++name;
224 size = strlen(name) - 1;
225 memcpy(comm_ev.comm, name, size++);
226 } else if (memcmp(bf, "Tgid:", 5) == 0) {
227 char *tgids = bf + 5;
228 while (*tgids && isspace(*tgids))
229 ++tgids;
230 tgid = comm_ev.pid = atoi(tgids);
231 }
232 }
233
Arnaldo Carvalho de Melo1a853e32009-05-14 22:50:46 -0300234 comm_ev.header.type = PERF_EVENT_COMM;
Paul Mackerras9cffa8d2009-06-19 22:21:42 +1000235 size = ALIGN(size, sizeof(u64));
Arnaldo Carvalho de Melo1a853e32009-05-14 22:50:46 -0300236 comm_ev.header.size = sizeof(comm_ev) - (sizeof(comm_ev.comm) - size);
Ingo Molnar16f762a2009-05-27 09:10:38 +0200237
Peter Zijlstraf70e87d2009-06-02 14:13:24 +0200238 if (!full) {
239 comm_ev.tid = pid;
240
Peter Zijlstraf5970552009-06-18 23:22:55 +0200241 write_output(&comm_ev, comm_ev.header.size);
Arnaldo Carvalho de Melo2a8083f2009-08-11 16:22:00 -0300242 goto out_fclose;
Arnaldo Carvalho de Melo1a853e32009-05-14 22:50:46 -0300243 }
Peter Zijlstraf70e87d2009-06-02 14:13:24 +0200244
245 snprintf(filename, sizeof(filename), "/proc/%d/task", pid);
246
247 tasks = opendir(filename);
248 while (!readdir_r(tasks, &dirent, &next) && next) {
249 char *end;
250 pid = strtol(dirent.d_name, &end, 10);
251 if (*end)
252 continue;
253
254 comm_ev.tid = pid;
255
Peter Zijlstraf5970552009-06-18 23:22:55 +0200256 write_output(&comm_ev, comm_ev.header.size);
Peter Zijlstraf70e87d2009-06-02 14:13:24 +0200257 }
258 closedir(tasks);
Arnaldo Carvalho de Melo2a8083f2009-08-11 16:22:00 -0300259
260out_fclose:
261 fclose(fp);
262 return tgid;
Peter Zijlstraf70e87d2009-06-02 14:13:24 +0200263
Arnaldo Carvalho de Meloa0055ae2009-06-01 17:50:19 -0300264out_failure:
265 fprintf(stderr, "couldn't get COMM and pgid, malformed %s\n",
266 filename);
267 exit(EXIT_FAILURE);
Arnaldo Carvalho de Melo1a853e32009-05-14 22:50:46 -0300268}
269
Arnaldo Carvalho de Melo2a8083f2009-08-11 16:22:00 -0300270static void pid_synthesize_mmap_samples(pid_t pid, pid_t tgid)
Arnaldo Carvalho de Melo1a853e32009-05-14 22:50:46 -0300271{
272 char filename[PATH_MAX];
273 FILE *fp;
274
275 snprintf(filename, sizeof(filename), "/proc/%d/maps", pid);
276
277 fp = fopen(filename, "r");
278 if (fp == NULL) {
Ingo Molnar613d8602009-06-15 08:17:12 +0200279 /*
280 * We raced with a task exiting - just return:
281 */
282 if (verbose)
283 fprintf(stderr, "couldn't open %s\n", filename);
284 return;
Arnaldo Carvalho de Melo1a853e32009-05-14 22:50:46 -0300285 }
286 while (1) {
Arnaldo Carvalho de Meloa0055ae2009-06-01 17:50:19 -0300287 char bf[BUFSIZ], *pbf = bf;
Arnaldo Carvalho de Melo1a853e32009-05-14 22:50:46 -0300288 struct mmap_event mmap_ev = {
Ingo Molnarf37a2912009-07-01 12:37:06 +0200289 .header = { .type = PERF_EVENT_MMAP },
Arnaldo Carvalho de Melo1a853e32009-05-14 22:50:46 -0300290 };
Arnaldo Carvalho de Meloa0055ae2009-06-01 17:50:19 -0300291 int n;
Arnaldo Carvalho de Melo1a853e32009-05-14 22:50:46 -0300292 size_t size;
293 if (fgets(bf, sizeof(bf), fp) == NULL)
294 break;
295
296 /* 00400000-0040c000 r-xp 00000000 fd:01 41038 /bin/cat */
Arnaldo Carvalho de Meloa0055ae2009-06-01 17:50:19 -0300297 n = hex2u64(pbf, &mmap_ev.start);
298 if (n < 0)
299 continue;
300 pbf += n + 1;
301 n = hex2u64(pbf, &mmap_ev.len);
302 if (n < 0)
303 continue;
304 pbf += n + 3;
305 if (*pbf == 'x') { /* vm_exec */
Johannes Weiner76c64c52009-06-24 21:08:36 +0200306 char *execname = strchr(bf, '/');
Arnaldo Carvalho de Melo1a853e32009-05-14 22:50:46 -0300307
Anton Blanchard11b5f812009-07-16 15:44:29 +0200308 /* Catch VDSO */
309 if (execname == NULL)
310 execname = strstr(bf, "[vdso]");
311
Johannes Weiner76c64c52009-06-24 21:08:36 +0200312 if (execname == NULL)
Arnaldo Carvalho de Melo1a853e32009-05-14 22:50:46 -0300313 continue;
314
Arnaldo Carvalho de Melo1a853e32009-05-14 22:50:46 -0300315 size = strlen(execname);
316 execname[size - 1] = '\0'; /* Remove \n */
317 memcpy(mmap_ev.filename, execname, size);
Paul Mackerras9cffa8d2009-06-19 22:21:42 +1000318 size = ALIGN(size, sizeof(u64));
Arnaldo Carvalho de Melo1a853e32009-05-14 22:50:46 -0300319 mmap_ev.len -= mmap_ev.start;
320 mmap_ev.header.size = (sizeof(mmap_ev) -
321 (sizeof(mmap_ev.filename) - size));
Arnaldo Carvalho de Melo2a8083f2009-08-11 16:22:00 -0300322 mmap_ev.pid = tgid;
Arnaldo Carvalho de Melo1a853e32009-05-14 22:50:46 -0300323 mmap_ev.tid = pid;
324
Peter Zijlstraf5970552009-06-18 23:22:55 +0200325 write_output(&mmap_ev, mmap_ev.header.size);
Arnaldo Carvalho de Melo1a853e32009-05-14 22:50:46 -0300326 }
327 }
328
329 fclose(fp);
330}
331
Peter Zijlstra7c6a1c62009-06-25 17:05:54 +0200332static void synthesize_all(void)
Peter Zijlstraf70e87d2009-06-02 14:13:24 +0200333{
334 DIR *proc;
335 struct dirent dirent, *next;
336
337 proc = opendir("/proc");
338
339 while (!readdir_r(proc, &dirent, &next) && next) {
340 char *end;
Arnaldo Carvalho de Melo2a8083f2009-08-11 16:22:00 -0300341 pid_t pid, tgid;
Peter Zijlstraf70e87d2009-06-02 14:13:24 +0200342
343 pid = strtol(dirent.d_name, &end, 10);
344 if (*end) /* only interested in proper numerical dirents */
345 continue;
346
Arnaldo Carvalho de Melo2a8083f2009-08-11 16:22:00 -0300347 tgid = pid_synthesize_comm_event(pid, 1);
348 pid_synthesize_mmap_samples(pid, tgid);
Peter Zijlstraf70e87d2009-06-02 14:13:24 +0200349 }
350
351 closedir(proc);
352}
353
Ingo Molnarf250c0302009-06-05 13:18:41 +0200354static int group_fd;
355
Peter Zijlstra7c6a1c62009-06-25 17:05:54 +0200356static struct perf_header_attr *get_header_attr(struct perf_counter_attr *a, int nr)
357{
358 struct perf_header_attr *h_attr;
359
360 if (nr < header->attrs) {
361 h_attr = header->attr[nr];
362 } else {
363 h_attr = perf_header_attr__new(a);
364 perf_header__add_attr(header, h_attr);
365 }
366
367 return h_attr;
368}
369
Ingo Molnarf250c0302009-06-05 13:18:41 +0200370static void create_counter(int counter, int cpu, pid_t pid)
Peter Zijlstrade9ac072009-04-08 15:01:31 +0200371{
Ingo Molnara21ca2c2009-06-06 09:58:57 +0200372 struct perf_counter_attr *attr = attrs + counter;
Peter Zijlstra7c6a1c62009-06-25 17:05:54 +0200373 struct perf_header_attr *h_attr;
374 int track = !counter; /* only the first counter needs these */
375 struct {
376 u64 count;
377 u64 time_enabled;
378 u64 time_running;
379 u64 id;
380 } read_data;
381
382 attr->read_format = PERF_FORMAT_TOTAL_TIME_ENABLED |
383 PERF_FORMAT_TOTAL_TIME_RUNNING |
384 PERF_FORMAT_ID;
Peter Zijlstra16c8a102009-05-05 17:50:27 +0200385
Frederic Weisbecker3a9f1312009-08-13 10:27:18 +0200386 attr->sample_type |= PERF_SAMPLE_IP | PERF_SAMPLE_TID;
Ingo Molnar3efa1cc92009-06-14 15:04:15 +0200387
Ingo Molnar1dba15e2009-06-05 18:37:22 +0200388 if (freq) {
Peter Zijlstraea1900e2009-06-10 21:45:22 +0200389 attr->sample_type |= PERF_SAMPLE_PERIOD;
Ingo Molnara21ca2c2009-06-06 09:58:57 +0200390 attr->freq = 1;
391 attr->sample_freq = freq;
Ingo Molnar1dba15e2009-06-05 18:37:22 +0200392 }
Ingo Molnar3efa1cc92009-06-14 15:04:15 +0200393
Peter Zijlstra649c48a2009-06-24 21:12:48 +0200394 if (no_samples)
395 attr->sample_freq = 0;
396
397 if (inherit_stat)
398 attr->inherit_stat = 1;
399
Anton Blanchard4bba8282009-07-16 15:44:29 +0200400 if (sample_address)
401 attr->sample_type |= PERF_SAMPLE_ADDR;
402
Ingo Molnar3efa1cc92009-06-14 15:04:15 +0200403 if (call_graph)
404 attr->sample_type |= PERF_SAMPLE_CALLCHAIN;
405
Ingo Molnarcd6feee2009-09-02 20:20:38 +0200406 if (raw_samples) {
Frederic Weisbeckerdaac07b2009-08-13 10:27:19 +0200407 attr->sample_type |= PERF_SAMPLE_RAW;
Ingo Molnarcd6feee2009-09-02 20:20:38 +0200408 attr->sample_type |= PERF_SAMPLE_CPU;
409 }
Frederic Weisbeckerf413cdb2009-08-07 01:25:54 +0200410
Ingo Molnara21ca2c2009-06-06 09:58:57 +0200411 attr->mmap = track;
412 attr->comm = track;
413 attr->inherit = (cpu < 0) && inherit;
Peter Zijlstra4502d772009-06-10 15:03:06 +0200414 attr->disabled = 1;
Ingo Molnarf250c0302009-06-05 13:18:41 +0200415
Ingo Molnar3da297a2009-06-07 17:39:02 +0200416try_again:
Ingo Molnara21ca2c2009-06-06 09:58:57 +0200417 fd[nr_cpu][counter] = sys_perf_counter_open(attr, pid, cpu, group_fd, 0);
Ingo Molnarf250c0302009-06-05 13:18:41 +0200418
419 if (fd[nr_cpu][counter] < 0) {
420 int err = errno;
421
Ingo Molnarf250c0302009-06-05 13:18:41 +0200422 if (err == EPERM)
Ingo Molnar3da297a2009-06-07 17:39:02 +0200423 die("Permission error - are you root?\n");
Jens Axboe0a5ac842009-08-12 11:18:01 +0200424 else if (err == ENODEV && profile_cpu != -1)
425 die("No such device - did you specify an out-of-range profile CPU?\n");
Ingo Molnar3da297a2009-06-07 17:39:02 +0200426
427 /*
428 * If it's cycles then fall back to hrtimer
429 * based cpu-clock-tick sw counter, which
430 * is always available even if no PMU support:
431 */
432 if (attr->type == PERF_TYPE_HARDWARE
Peter Zijlstraf4dbfa82009-06-11 14:06:28 +0200433 && attr->config == PERF_COUNT_HW_CPU_CYCLES) {
Ingo Molnar3da297a2009-06-07 17:39:02 +0200434
435 if (verbose)
436 warning(" ... trying to fall back to cpu-clock-ticks\n");
437 attr->type = PERF_TYPE_SOFTWARE;
Peter Zijlstraf4dbfa82009-06-11 14:06:28 +0200438 attr->config = PERF_COUNT_SW_CPU_CLOCK;
Ingo Molnar3da297a2009-06-07 17:39:02 +0200439 goto try_again;
440 }
Ingo Molnar30c806a2009-06-07 17:46:24 +0200441 printf("\n");
442 error("perfcounter syscall returned with %d (%s)\n",
443 fd[nr_cpu][counter], strerror(err));
444 die("No CONFIG_PERF_COUNTERS=y kernel support configured?\n");
Ingo Molnarf250c0302009-06-05 13:18:41 +0200445 exit(-1);
446 }
Ingo Molnar3da297a2009-06-07 17:39:02 +0200447
Peter Zijlstra7c6a1c62009-06-25 17:05:54 +0200448 h_attr = get_header_attr(attr, counter);
449
450 if (!file_new) {
451 if (memcmp(&h_attr->attr, attr, sizeof(*attr))) {
452 fprintf(stderr, "incompatible append\n");
453 exit(-1);
454 }
455 }
456
Frederic Weisbecker3928ddb2009-06-25 22:21:27 +0200457 if (read(fd[nr_cpu][counter], &read_data, sizeof(read_data)) == -1) {
458 perror("Unable to read perf file descriptor\n");
459 exit(-1);
460 }
Peter Zijlstra7c6a1c62009-06-25 17:05:54 +0200461
462 perf_header_attr__add_id(h_attr, read_data.id);
463
Ingo Molnarf250c0302009-06-05 13:18:41 +0200464 assert(fd[nr_cpu][counter] >= 0);
465 fcntl(fd[nr_cpu][counter], F_SETFL, O_NONBLOCK);
466
467 /*
468 * First counter acts as the group leader:
469 */
470 if (group && group_fd == -1)
471 group_fd = fd[nr_cpu][counter];
472
473 event_array[nr_poll].fd = fd[nr_cpu][counter];
474 event_array[nr_poll].events = POLLIN;
475 nr_poll++;
476
477 mmap_array[nr_cpu][counter].counter = counter;
478 mmap_array[nr_cpu][counter].prev = 0;
479 mmap_array[nr_cpu][counter].mask = mmap_pages*page_size - 1;
480 mmap_array[nr_cpu][counter].base = mmap(NULL, (mmap_pages+1)*page_size,
Peter Zijlstra9d91a6f2009-06-18 11:40:28 +0200481 PROT_READ|PROT_WRITE, MAP_SHARED, fd[nr_cpu][counter], 0);
Ingo Molnarf250c0302009-06-05 13:18:41 +0200482 if (mmap_array[nr_cpu][counter].base == MAP_FAILED) {
483 error("failed to mmap with %d (%s)\n", errno, strerror(errno));
484 exit(-1);
485 }
Peter Zijlstra4502d772009-06-10 15:03:06 +0200486
487 ioctl(fd[nr_cpu][counter], PERF_COUNTER_IOC_ENABLE);
Ingo Molnarf250c0302009-06-05 13:18:41 +0200488}
489
490static void open_counters(int cpu, pid_t pid)
491{
492 int counter;
493
Peter Zijlstra16c8a102009-05-05 17:50:27 +0200494 group_fd = -1;
Ingo Molnarf250c0302009-06-05 13:18:41 +0200495 for (counter = 0; counter < nr_counters; counter++)
496 create_counter(counter, cpu, pid);
Peter Zijlstra16c8a102009-05-05 17:50:27 +0200497
Peter Zijlstra16c8a102009-05-05 17:50:27 +0200498 nr_cpu++;
499}
500
Peter Zijlstraf5970552009-06-18 23:22:55 +0200501static void atexit_header(void)
502{
Peter Zijlstra7c6a1c62009-06-25 17:05:54 +0200503 header->data_size += bytes_written;
Peter Zijlstraf5970552009-06-18 23:22:55 +0200504
Peter Zijlstra7c6a1c62009-06-25 17:05:54 +0200505 perf_header__write(header, output);
Peter Zijlstraf5970552009-06-18 23:22:55 +0200506}
507
Ingo Molnar0e9b20b2009-05-26 09:17:18 +0200508static int __cmd_record(int argc, const char **argv)
Peter Zijlstra16c8a102009-05-05 17:50:27 +0200509{
510 int i, counter;
Peter Zijlstra97124d52009-06-02 15:52:24 +0200511 struct stat st;
Peter Zijlstra7c6a1c62009-06-25 17:05:54 +0200512 pid_t pid = 0;
Ingo Molnarabaff322009-06-02 22:59:57 +0200513 int flags;
514 int ret;
Peter Zijlstrade9ac072009-04-08 15:01:31 +0200515
516 page_size = sysconf(_SC_PAGE_SIZE);
Peter Zijlstrade9ac072009-04-08 15:01:31 +0200517 nr_cpus = sysconf(_SC_NPROCESSORS_ONLN);
518 assert(nr_cpus <= MAX_NR_CPUS);
519 assert(nr_cpus >= 0);
520
Peter Zijlstraf5970552009-06-18 23:22:55 +0200521 atexit(sig_atexit);
522 signal(SIGCHLD, sig_handler);
523 signal(SIGINT, sig_handler);
524
Pierre Habouzit266e0e22009-08-07 14:16:01 +0200525 if (!stat(output_name, &st) && st.st_size) {
526 if (!force && !append_file) {
527 fprintf(stderr, "Error, output file %s exists, use -A to append or -f to overwrite.\n",
528 output_name);
529 exit(-1);
530 }
531 } else {
532 append_file = 0;
Peter Zijlstra97124d52009-06-02 15:52:24 +0200533 }
534
Ingo Molnarabaff322009-06-02 22:59:57 +0200535 flags = O_CREAT|O_RDWR;
536 if (append_file)
Peter Zijlstraf5970552009-06-18 23:22:55 +0200537 file_new = 0;
Ingo Molnarabaff322009-06-02 22:59:57 +0200538 else
539 flags |= O_TRUNC;
540
541 output = open(output_name, flags, S_IRUSR|S_IWUSR);
Peter Zijlstrade9ac072009-04-08 15:01:31 +0200542 if (output < 0) {
543 perror("failed to create output file");
544 exit(-1);
545 }
546
Peter Zijlstra7c6a1c62009-06-25 17:05:54 +0200547 if (!file_new)
548 header = perf_header__read(output);
549 else
550 header = perf_header__new();
Peter Zijlstraf5970552009-06-18 23:22:55 +0200551
Frederic Weisbecker9df37dd2009-08-17 23:07:50 +0200552
553 if (raw_samples) {
Frederic Weisbecker1ef2ed12009-08-28 03:09:58 +0200554 read_tracing_data(attrs, nr_counters);
Frederic Weisbecker9df37dd2009-08-17 23:07:50 +0200555 } else {
556 for (i = 0; i < nr_counters; i++) {
557 if (attrs[i].sample_type & PERF_SAMPLE_RAW) {
Frederic Weisbecker1ef2ed12009-08-28 03:09:58 +0200558 read_tracing_data(attrs, nr_counters);
Frederic Weisbecker9df37dd2009-08-17 23:07:50 +0200559 break;
560 }
561 }
562 }
Peter Zijlstraf5970552009-06-18 23:22:55 +0200563 atexit(atexit_header);
564
Arnaldo Carvalho de Melo1a853e32009-05-14 22:50:46 -0300565 if (!system_wide) {
Peter Zijlstra7c6a1c62009-06-25 17:05:54 +0200566 pid = target_pid;
567 if (pid == -1)
568 pid = getpid();
569
Jens Axboe0a5ac842009-08-12 11:18:01 +0200570 open_counters(profile_cpu, pid);
571 } else {
572 if (profile_cpu != -1) {
573 open_counters(profile_cpu, target_pid);
574 } else {
575 for (i = 0; i < nr_cpus; i++)
576 open_counters(i, target_pid);
577 }
578 }
Peter Zijlstrade9ac072009-04-08 15:01:31 +0200579
Peter Zijlstra7c6a1c62009-06-25 17:05:54 +0200580 if (file_new)
581 perf_header__write(header, output);
582
583 if (!system_wide) {
Arnaldo Carvalho de Melo2a8083f2009-08-11 16:22:00 -0300584 pid_t tgid = pid_synthesize_comm_event(pid, 0);
585 pid_synthesize_mmap_samples(pid, tgid);
Peter Zijlstra7c6a1c62009-06-25 17:05:54 +0200586 } else
587 synthesize_all();
588
Mike Galbraithef65b2a2009-05-27 10:10:51 +0200589 if (target_pid == -1 && argc) {
Arnaldo Carvalho de Melo1a853e32009-05-14 22:50:46 -0300590 pid = fork();
591 if (pid < 0)
592 perror("failed to fork");
Peter Zijlstrade9ac072009-04-08 15:01:31 +0200593
Arnaldo Carvalho de Melo1a853e32009-05-14 22:50:46 -0300594 if (!pid) {
Ingo Molnar0e9b20b2009-05-26 09:17:18 +0200595 if (execvp(argv[0], (char **)argv)) {
Arnaldo Carvalho de Melo1a853e32009-05-14 22:50:46 -0300596 perror(argv[0]);
597 exit(-1);
598 }
Peter Zijlstrade9ac072009-04-08 15:01:31 +0200599 }
600 }
601
602 if (realtime_prio) {
603 struct sched_param param;
604
605 param.sched_priority = realtime_prio;
606 if (sched_setscheduler(0, SCHED_FIFO, &param)) {
607 printf("Could not set realtime priority.\n");
608 exit(-1);
609 }
610 }
611
Peter Zijlstra649c48a2009-06-24 21:12:48 +0200612 for (;;) {
Ingo Molnar2debbc82009-06-05 14:29:10 +0200613 int hits = samples;
Peter Zijlstrade9ac072009-04-08 15:01:31 +0200614
Peter Zijlstra16c8a102009-05-05 17:50:27 +0200615 for (i = 0; i < nr_cpu; i++) {
Peter Zijlstrade9ac072009-04-08 15:01:31 +0200616 for (counter = 0; counter < nr_counters; counter++)
617 mmap_read(&mmap_array[i][counter]);
618 }
619
Peter Zijlstra649c48a2009-06-24 21:12:48 +0200620 if (hits == samples) {
621 if (done)
622 break;
Peter Zijlstrade9ac072009-04-08 15:01:31 +0200623 ret = poll(event_array, nr_poll, 100);
Peter Zijlstra649c48a2009-06-24 21:12:48 +0200624 }
Peter Zijlstrade9ac072009-04-08 15:01:31 +0200625 }
626
Ingo Molnar021e9f42009-06-03 19:27:19 +0200627 /*
628 * Approximate RIP event size: 24 bytes.
629 */
630 fprintf(stderr,
Ingo Molnar2debbc82009-06-05 14:29:10 +0200631 "[ perf record: Captured and wrote %.3f MB %s (~%lld samples) ]\n",
Ingo Molnar021e9f42009-06-03 19:27:19 +0200632 (double)bytes_written / 1024.0 / 1024.0,
633 output_name,
634 bytes_written / 24);
Ingo Molnaraddc2782009-06-02 23:43:11 +0200635
Peter Zijlstrade9ac072009-04-08 15:01:31 +0200636 return 0;
637}
Ingo Molnar0e9b20b2009-05-26 09:17:18 +0200638
Ingo Molnar0e9b20b2009-05-26 09:17:18 +0200639static const char * const record_usage[] = {
Mike Galbraith9e0967532009-05-28 16:25:34 +0200640 "perf record [<options>] [<command>]",
641 "perf record [<options>] -- <command> [<options>]",
Ingo Molnar0e9b20b2009-05-26 09:17:18 +0200642 NULL
643};
644
Ingo Molnar52425192009-05-26 09:17:18 +0200645static const struct option options[] = {
Ingo Molnar0e9b20b2009-05-26 09:17:18 +0200646 OPT_CALLBACK('e', "event", NULL, "event",
Thomas Gleixner86847b62009-06-06 12:24:17 +0200647 "event selector. use 'perf list' to list available events",
648 parse_events),
Ingo Molnar0e9b20b2009-05-26 09:17:18 +0200649 OPT_INTEGER('p', "pid", &target_pid,
650 "record events on existing pid"),
651 OPT_INTEGER('r', "realtime", &realtime_prio,
652 "collect data with this RT SCHED_FIFO priority"),
Frederic Weisbeckerdaac07b2009-08-13 10:27:19 +0200653 OPT_BOOLEAN('R', "raw-samples", &raw_samples,
654 "collect raw sample records from all opened counters"),
Ingo Molnar0e9b20b2009-05-26 09:17:18 +0200655 OPT_BOOLEAN('a', "all-cpus", &system_wide,
656 "system-wide collection from all CPUs"),
Ingo Molnarabaff322009-06-02 22:59:57 +0200657 OPT_BOOLEAN('A', "append", &append_file,
658 "append to the output file to do incremental profiling"),
Jens Axboe0a5ac842009-08-12 11:18:01 +0200659 OPT_INTEGER('C', "profile_cpu", &profile_cpu,
660 "CPU to profile on"),
Peter Zijlstra97124d52009-06-02 15:52:24 +0200661 OPT_BOOLEAN('f', "force", &force,
662 "overwrite existing data file"),
Peter Zijlstrae61078a2009-06-03 11:24:33 +0200663 OPT_LONG('c', "count", &default_interval,
Ingo Molnarabaff322009-06-02 22:59:57 +0200664 "event period to sample"),
665 OPT_STRING('o', "output", &output_name, "file",
666 "output file name"),
667 OPT_BOOLEAN('i', "inherit", &inherit,
668 "child tasks inherit counters"),
Ingo Molnarcf1f4572009-06-05 13:27:02 +0200669 OPT_INTEGER('F', "freq", &freq,
670 "profile at this frequency"),
Ingo Molnarabaff322009-06-02 22:59:57 +0200671 OPT_INTEGER('m', "mmap-pages", &mmap_pages,
672 "number of mmap data pages"),
Ingo Molnar3efa1cc92009-06-14 15:04:15 +0200673 OPT_BOOLEAN('g', "call-graph", &call_graph,
674 "do call-graph (stack chain/backtrace) recording"),
Ingo Molnar3da297a2009-06-07 17:39:02 +0200675 OPT_BOOLEAN('v', "verbose", &verbose,
676 "be more verbose (show counter open errors, etc)"),
Peter Zijlstra649c48a2009-06-24 21:12:48 +0200677 OPT_BOOLEAN('s', "stat", &inherit_stat,
678 "per thread counts"),
Anton Blanchard4bba8282009-07-16 15:44:29 +0200679 OPT_BOOLEAN('d', "data", &sample_address,
680 "Sample addresses"),
Peter Zijlstra649c48a2009-06-24 21:12:48 +0200681 OPT_BOOLEAN('n', "no-samples", &no_samples,
682 "don't sample"),
Ingo Molnar0e9b20b2009-05-26 09:17:18 +0200683 OPT_END()
684};
685
Ingo Molnarf37a2912009-07-01 12:37:06 +0200686int cmd_record(int argc, const char **argv, const char *prefix __used)
Ingo Molnar0e9b20b2009-05-26 09:17:18 +0200687{
688 int counter;
689
Anton Blancharda0541232009-07-22 23:04:12 +1000690 argc = parse_options(argc, argv, options, record_usage,
691 PARSE_OPT_STOP_AT_NON_OPTION);
Mike Galbraithef65b2a2009-05-27 10:10:51 +0200692 if (!argc && target_pid == -1 && !system_wide)
Ingo Molnar0e9b20b2009-05-26 09:17:18 +0200693 usage_with_options(record_usage, options);
694
Peter Zijlstrabbd36e52009-06-11 23:11:50 +0200695 if (!nr_counters) {
696 nr_counters = 1;
697 attrs[0].type = PERF_TYPE_HARDWARE;
698 attrs[0].config = PERF_COUNT_HW_CPU_CYCLES;
699 }
Ingo Molnar0e9b20b2009-05-26 09:17:18 +0200700
701 for (counter = 0; counter < nr_counters; counter++) {
Ingo Molnara21ca2c2009-06-06 09:58:57 +0200702 if (attrs[counter].sample_period)
Ingo Molnar0e9b20b2009-05-26 09:17:18 +0200703 continue;
704
Ingo Molnara21ca2c2009-06-06 09:58:57 +0200705 attrs[counter].sample_period = default_interval;
Ingo Molnar0e9b20b2009-05-26 09:17:18 +0200706 }
707
708 return __cmd_record(argc, argv);
709}