blob: 0f5771f615dae24cd9a4073eb9b5ee95419f1124 [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 Zijlstra97124d52009-06-02 15:52:24 +020017#include <unistd.h>
Peter Zijlstrade9ac072009-04-08 15:01:31 +020018#include <sched.h>
Peter Zijlstrade9ac072009-04-08 15:01:31 +020019
Ingo Molnar0e9b20b2009-05-26 09:17:18 +020020#define ALIGN(x, a) __ALIGN_MASK(x, (typeof(x))(a)-1)
21#define __ALIGN_MASK(x, mask) (((x)+(mask))&~(mask))
Arnaldo Carvalho de Melo1a853e32009-05-14 22:50:46 -030022
Peter Zijlstrade9ac072009-04-08 15:01:31 +020023static int fd[MAX_NR_CPUS][MAX_COUNTERS];
Ingo Molnara21ca2c2009-06-06 09:58:57 +020024
25static long default_interval = 100000;
26
Ingo Molnar3cf165f2009-06-02 23:02:59 +020027static int nr_cpus = 0;
Peter Zijlstrade9ac072009-04-08 15:01:31 +020028static unsigned int page_size;
Ingo Molnar3cf165f2009-06-02 23:02:59 +020029static unsigned int mmap_pages = 128;
Ingo Molnarcf1f4572009-06-05 13:27:02 +020030static int freq = 0;
Peter Zijlstrade9ac072009-04-08 15:01:31 +020031static int output;
Ingo Molnar23ac9cb2009-05-27 09:33:18 +020032static const char *output_name = "perf.data";
Peter Zijlstrade9ac072009-04-08 15:01:31 +020033static int group = 0;
Peter Zijlstra16c8a102009-05-05 17:50:27 +020034static unsigned int realtime_prio = 0;
35static int system_wide = 0;
Arnaldo Carvalho de Melo1a853e32009-05-14 22:50:46 -030036static pid_t target_pid = -1;
Peter Zijlstra16c8a102009-05-05 17:50:27 +020037static int inherit = 1;
Peter Zijlstra97124d52009-06-02 15:52:24 +020038static int force = 0;
Ingo Molnarabaff322009-06-02 22:59:57 +020039static int append_file = 0;
Ingo Molnar3da297a2009-06-07 17:39:02 +020040static int verbose = 0;
Peter Zijlstrade9ac072009-04-08 15:01:31 +020041
Ingo Molnara21ca2c2009-06-06 09:58:57 +020042static long samples;
43static struct timeval last_read;
44static struct timeval this_read;
45
46static __u64 bytes_written;
47
48static struct pollfd event_array[MAX_NR_CPUS * MAX_COUNTERS];
49
50static int nr_poll;
51static int nr_cpu;
52
53struct mmap_event {
54 struct perf_event_header header;
55 __u32 pid;
56 __u32 tid;
57 __u64 start;
58 __u64 len;
59 __u64 pgoff;
60 char filename[PATH_MAX];
Peter Zijlstrade9ac072009-04-08 15:01:31 +020061};
62
Ingo Molnara21ca2c2009-06-06 09:58:57 +020063struct comm_event {
64 struct perf_event_header header;
65 __u32 pid;
66 __u32 tid;
67 char comm[16];
Peter Zijlstrade9ac072009-04-08 15:01:31 +020068};
69
Ingo Molnara21ca2c2009-06-06 09:58:57 +020070
71struct mmap_data {
72 int counter;
73 void *base;
74 unsigned int mask;
75 unsigned int prev;
76};
77
78static struct mmap_data mmap_array[MAX_NR_CPUS][MAX_COUNTERS];
79
Peter Zijlstrade9ac072009-04-08 15:01:31 +020080static unsigned int mmap_read_head(struct mmap_data *md)
81{
82 struct perf_counter_mmap_page *pc = md->base;
83 int head;
84
85 head = pc->data_head;
86 rmb();
87
88 return head;
89}
90
Peter Zijlstrade9ac072009-04-08 15:01:31 +020091static void mmap_read(struct mmap_data *md)
92{
93 unsigned int head = mmap_read_head(md);
94 unsigned int old = md->prev;
95 unsigned char *data = md->base + page_size;
96 unsigned long size;
97 void *buf;
98 int diff;
99
100 gettimeofday(&this_read, NULL);
101
102 /*
103 * If we're further behind than half the buffer, there's a chance
Ingo Molnar2debbc82009-06-05 14:29:10 +0200104 * the writer will bite our tail and mess up the samples under us.
Peter Zijlstrade9ac072009-04-08 15:01:31 +0200105 *
106 * If we somehow ended up ahead of the head, we got messed up.
107 *
108 * In either case, truncate and restart at head.
109 */
110 diff = head - old;
111 if (diff > md->mask / 2 || diff < 0) {
112 struct timeval iv;
113 unsigned long msecs;
114
115 timersub(&this_read, &last_read, &iv);
116 msecs = iv.tv_sec*1000 + iv.tv_usec/1000;
117
118 fprintf(stderr, "WARNING: failed to keep up with mmap data."
119 " Last read %lu msecs ago.\n", msecs);
120
121 /*
122 * head points to a known good entry, start there.
123 */
124 old = head;
125 }
126
127 last_read = this_read;
128
129 if (old != head)
Ingo Molnar2debbc82009-06-05 14:29:10 +0200130 samples++;
Peter Zijlstrade9ac072009-04-08 15:01:31 +0200131
132 size = head - old;
133
134 if ((old & md->mask) + size != (head & md->mask)) {
135 buf = &data[old & md->mask];
136 size = md->mask + 1 - (old & md->mask);
137 old += size;
Ingo Molnar021e9f42009-06-03 19:27:19 +0200138
Peter Zijlstrade9ac072009-04-08 15:01:31 +0200139 while (size) {
140 int ret = write(output, buf, size);
Ingo Molnar021e9f42009-06-03 19:27:19 +0200141
142 if (ret < 0)
143 die("failed to write");
144
Peter Zijlstrade9ac072009-04-08 15:01:31 +0200145 size -= ret;
146 buf += ret;
Ingo Molnar021e9f42009-06-03 19:27:19 +0200147
148 bytes_written += ret;
Peter Zijlstrade9ac072009-04-08 15:01:31 +0200149 }
150 }
151
152 buf = &data[old & md->mask];
153 size = head - old;
154 old += size;
Ingo Molnar021e9f42009-06-03 19:27:19 +0200155
Peter Zijlstrade9ac072009-04-08 15:01:31 +0200156 while (size) {
157 int ret = write(output, buf, size);
Ingo Molnar021e9f42009-06-03 19:27:19 +0200158
159 if (ret < 0)
160 die("failed to write");
161
Peter Zijlstrade9ac072009-04-08 15:01:31 +0200162 size -= ret;
163 buf += ret;
Ingo Molnar021e9f42009-06-03 19:27:19 +0200164
165 bytes_written += ret;
Peter Zijlstrade9ac072009-04-08 15:01:31 +0200166 }
167
168 md->prev = old;
169}
170
171static volatile int done = 0;
Peter Zijlstraf7b7c262009-06-10 15:55:59 +0200172static volatile int signr = -1;
Peter Zijlstrade9ac072009-04-08 15:01:31 +0200173
Peter Zijlstra16c8a102009-05-05 17:50:27 +0200174static void sig_handler(int sig)
Peter Zijlstrade9ac072009-04-08 15:01:31 +0200175{
Peter Zijlstra16c8a102009-05-05 17:50:27 +0200176 done = 1;
Peter Zijlstraf7b7c262009-06-10 15:55:59 +0200177 signr = sig;
178}
179
180static void sig_atexit(void)
181{
182 if (signr == -1)
183 return;
184
185 signal(signr, SIG_DFL);
186 kill(getpid(), signr);
Peter Zijlstrade9ac072009-04-08 15:01:31 +0200187}
188
Peter Zijlstraf70e87d2009-06-02 14:13:24 +0200189static void pid_synthesize_comm_event(pid_t pid, int full)
Arnaldo Carvalho de Melo1a853e32009-05-14 22:50:46 -0300190{
Arnaldo Carvalho de Melo1a853e32009-05-14 22:50:46 -0300191 struct comm_event comm_ev;
Ingo Molnar16f762a2009-05-27 09:10:38 +0200192 char filename[PATH_MAX];
Ingo Molnar16f762a2009-05-27 09:10:38 +0200193 char bf[BUFSIZ];
Arnaldo Carvalho de Meloa0055ae2009-06-01 17:50:19 -0300194 int fd, ret;
Arnaldo Carvalho de Melo1a853e32009-05-14 22:50:46 -0300195 size_t size;
Arnaldo Carvalho de Meloa0055ae2009-06-01 17:50:19 -0300196 char *field, *sep;
Peter Zijlstraf70e87d2009-06-02 14:13:24 +0200197 DIR *tasks;
198 struct dirent dirent, *next;
Arnaldo Carvalho de Melo1a853e32009-05-14 22:50:46 -0300199
200 snprintf(filename, sizeof(filename), "/proc/%d/stat", pid);
201
202 fd = open(filename, O_RDONLY);
203 if (fd < 0) {
204 fprintf(stderr, "couldn't open %s\n", filename);
205 exit(EXIT_FAILURE);
206 }
207 if (read(fd, bf, sizeof(bf)) < 0) {
208 fprintf(stderr, "couldn't read %s\n", filename);
209 exit(EXIT_FAILURE);
210 }
211 close(fd);
212
Arnaldo Carvalho de Meloa0055ae2009-06-01 17:50:19 -0300213 /* 9027 (cat) R 6747 9027 6747 34816 9027 ... */
Arnaldo Carvalho de Melo1a853e32009-05-14 22:50:46 -0300214 memset(&comm_ev, 0, sizeof(comm_ev));
Arnaldo Carvalho de Meloa0055ae2009-06-01 17:50:19 -0300215 field = strchr(bf, '(');
216 if (field == NULL)
217 goto out_failure;
218 sep = strchr(++field, ')');
219 if (sep == NULL)
220 goto out_failure;
221 size = sep - field;
222 memcpy(comm_ev.comm, field, size++);
Peter Zijlstraf70e87d2009-06-02 14:13:24 +0200223
224 comm_ev.pid = pid;
Arnaldo Carvalho de Melo1a853e32009-05-14 22:50:46 -0300225 comm_ev.header.type = PERF_EVENT_COMM;
Ingo Molnar729ff5e22009-06-11 14:16:15 +0200226 size = ALIGN(size, sizeof(__u64));
Arnaldo Carvalho de Melo1a853e32009-05-14 22:50:46 -0300227 comm_ev.header.size = sizeof(comm_ev) - (sizeof(comm_ev.comm) - size);
Ingo Molnar16f762a2009-05-27 09:10:38 +0200228
Peter Zijlstraf70e87d2009-06-02 14:13:24 +0200229 if (!full) {
230 comm_ev.tid = pid;
231
232 ret = write(output, &comm_ev, comm_ev.header.size);
233 if (ret < 0) {
234 perror("failed to write");
235 exit(-1);
236 }
237 return;
Arnaldo Carvalho de Melo1a853e32009-05-14 22:50:46 -0300238 }
Peter Zijlstraf70e87d2009-06-02 14:13:24 +0200239
240 snprintf(filename, sizeof(filename), "/proc/%d/task", pid);
241
242 tasks = opendir(filename);
243 while (!readdir_r(tasks, &dirent, &next) && next) {
244 char *end;
245 pid = strtol(dirent.d_name, &end, 10);
246 if (*end)
247 continue;
248
249 comm_ev.tid = pid;
250
251 ret = write(output, &comm_ev, comm_ev.header.size);
252 if (ret < 0) {
253 perror("failed to write");
254 exit(-1);
255 }
256 }
257 closedir(tasks);
258 return;
259
Arnaldo Carvalho de Meloa0055ae2009-06-01 17:50:19 -0300260out_failure:
261 fprintf(stderr, "couldn't get COMM and pgid, malformed %s\n",
262 filename);
263 exit(EXIT_FAILURE);
Arnaldo Carvalho de Melo1a853e32009-05-14 22:50:46 -0300264}
265
Ingo Molnar2debbc82009-06-05 14:29:10 +0200266static void pid_synthesize_mmap_samples(pid_t pid)
Arnaldo Carvalho de Melo1a853e32009-05-14 22:50:46 -0300267{
268 char filename[PATH_MAX];
269 FILE *fp;
270
271 snprintf(filename, sizeof(filename), "/proc/%d/maps", pid);
272
273 fp = fopen(filename, "r");
274 if (fp == NULL) {
275 fprintf(stderr, "couldn't open %s\n", filename);
276 exit(EXIT_FAILURE);
277 }
278 while (1) {
Arnaldo Carvalho de Meloa0055ae2009-06-01 17:50:19 -0300279 char bf[BUFSIZ], *pbf = bf;
Arnaldo Carvalho de Melo1a853e32009-05-14 22:50:46 -0300280 struct mmap_event mmap_ev = {
281 .header.type = PERF_EVENT_MMAP,
282 };
Arnaldo Carvalho de Meloa0055ae2009-06-01 17:50:19 -0300283 int n;
Arnaldo Carvalho de Melo1a853e32009-05-14 22:50:46 -0300284 size_t size;
285 if (fgets(bf, sizeof(bf), fp) == NULL)
286 break;
287
288 /* 00400000-0040c000 r-xp 00000000 fd:01 41038 /bin/cat */
Arnaldo Carvalho de Meloa0055ae2009-06-01 17:50:19 -0300289 n = hex2u64(pbf, &mmap_ev.start);
290 if (n < 0)
291 continue;
292 pbf += n + 1;
293 n = hex2u64(pbf, &mmap_ev.len);
294 if (n < 0)
295 continue;
296 pbf += n + 3;
297 if (*pbf == 'x') { /* vm_exec */
Arnaldo Carvalho de Melo1a853e32009-05-14 22:50:46 -0300298 char *execname = strrchr(bf, ' ');
299
300 if (execname == NULL || execname[1] != '/')
301 continue;
302
303 execname += 1;
304 size = strlen(execname);
305 execname[size - 1] = '\0'; /* Remove \n */
306 memcpy(mmap_ev.filename, execname, size);
Ingo Molnar729ff5e22009-06-11 14:16:15 +0200307 size = ALIGN(size, sizeof(__u64));
Arnaldo Carvalho de Melo1a853e32009-05-14 22:50:46 -0300308 mmap_ev.len -= mmap_ev.start;
309 mmap_ev.header.size = (sizeof(mmap_ev) -
310 (sizeof(mmap_ev.filename) - size));
Peter Zijlstraf70e87d2009-06-02 14:13:24 +0200311 mmap_ev.pid = pid;
Arnaldo Carvalho de Melo1a853e32009-05-14 22:50:46 -0300312 mmap_ev.tid = pid;
313
314 if (write(output, &mmap_ev, mmap_ev.header.size) < 0) {
315 perror("failed to write");
316 exit(-1);
317 }
318 }
319 }
320
321 fclose(fp);
322}
323
Ingo Molnar2debbc82009-06-05 14:29:10 +0200324static void synthesize_samples(void)
Peter Zijlstraf70e87d2009-06-02 14:13:24 +0200325{
326 DIR *proc;
327 struct dirent dirent, *next;
328
329 proc = opendir("/proc");
330
331 while (!readdir_r(proc, &dirent, &next) && next) {
332 char *end;
333 pid_t pid;
334
335 pid = strtol(dirent.d_name, &end, 10);
336 if (*end) /* only interested in proper numerical dirents */
337 continue;
338
339 pid_synthesize_comm_event(pid, 1);
Ingo Molnar2debbc82009-06-05 14:29:10 +0200340 pid_synthesize_mmap_samples(pid);
Peter Zijlstraf70e87d2009-06-02 14:13:24 +0200341 }
342
343 closedir(proc);
344}
345
Ingo Molnarf250c0302009-06-05 13:18:41 +0200346static int group_fd;
347
348static void create_counter(int counter, int cpu, pid_t pid)
Peter Zijlstrade9ac072009-04-08 15:01:31 +0200349{
Ingo Molnara21ca2c2009-06-06 09:58:57 +0200350 struct perf_counter_attr *attr = attrs + counter;
Peter Zijlstra16c8a102009-05-05 17:50:27 +0200351 int track = 1;
Peter Zijlstra16c8a102009-05-05 17:50:27 +0200352
Peter Zijlstraea1900e2009-06-10 21:45:22 +0200353 attr->sample_type = PERF_SAMPLE_IP | PERF_SAMPLE_TID;
Ingo Molnar1dba15e2009-06-05 18:37:22 +0200354 if (freq) {
Peter Zijlstraea1900e2009-06-10 21:45:22 +0200355 attr->sample_type |= PERF_SAMPLE_PERIOD;
Ingo Molnara21ca2c2009-06-06 09:58:57 +0200356 attr->freq = 1;
357 attr->sample_freq = freq;
Ingo Molnar1dba15e2009-06-05 18:37:22 +0200358 }
Ingo Molnara21ca2c2009-06-06 09:58:57 +0200359 attr->mmap = track;
360 attr->comm = track;
361 attr->inherit = (cpu < 0) && inherit;
Peter Zijlstra4502d772009-06-10 15:03:06 +0200362 attr->disabled = 1;
Ingo Molnarf250c0302009-06-05 13:18:41 +0200363
364 track = 0; /* only the first counter needs these */
365
Ingo Molnar3da297a2009-06-07 17:39:02 +0200366try_again:
Ingo Molnara21ca2c2009-06-06 09:58:57 +0200367 fd[nr_cpu][counter] = sys_perf_counter_open(attr, pid, cpu, group_fd, 0);
Ingo Molnarf250c0302009-06-05 13:18:41 +0200368
369 if (fd[nr_cpu][counter] < 0) {
370 int err = errno;
371
Ingo Molnarf250c0302009-06-05 13:18:41 +0200372 if (err == EPERM)
Ingo Molnar3da297a2009-06-07 17:39:02 +0200373 die("Permission error - are you root?\n");
374
375 /*
376 * If it's cycles then fall back to hrtimer
377 * based cpu-clock-tick sw counter, which
378 * is always available even if no PMU support:
379 */
380 if (attr->type == PERF_TYPE_HARDWARE
Peter Zijlstraf4dbfa82009-06-11 14:06:28 +0200381 && attr->config == PERF_COUNT_HW_CPU_CYCLES) {
Ingo Molnar3da297a2009-06-07 17:39:02 +0200382
383 if (verbose)
384 warning(" ... trying to fall back to cpu-clock-ticks\n");
385 attr->type = PERF_TYPE_SOFTWARE;
Peter Zijlstraf4dbfa82009-06-11 14:06:28 +0200386 attr->config = PERF_COUNT_SW_CPU_CLOCK;
Ingo Molnar3da297a2009-06-07 17:39:02 +0200387 goto try_again;
388 }
Ingo Molnar30c806a2009-06-07 17:46:24 +0200389 printf("\n");
390 error("perfcounter syscall returned with %d (%s)\n",
391 fd[nr_cpu][counter], strerror(err));
392 die("No CONFIG_PERF_COUNTERS=y kernel support configured?\n");
Ingo Molnarf250c0302009-06-05 13:18:41 +0200393 exit(-1);
394 }
Ingo Molnar3da297a2009-06-07 17:39:02 +0200395
Ingo Molnarf250c0302009-06-05 13:18:41 +0200396 assert(fd[nr_cpu][counter] >= 0);
397 fcntl(fd[nr_cpu][counter], F_SETFL, O_NONBLOCK);
398
399 /*
400 * First counter acts as the group leader:
401 */
402 if (group && group_fd == -1)
403 group_fd = fd[nr_cpu][counter];
404
405 event_array[nr_poll].fd = fd[nr_cpu][counter];
406 event_array[nr_poll].events = POLLIN;
407 nr_poll++;
408
409 mmap_array[nr_cpu][counter].counter = counter;
410 mmap_array[nr_cpu][counter].prev = 0;
411 mmap_array[nr_cpu][counter].mask = mmap_pages*page_size - 1;
412 mmap_array[nr_cpu][counter].base = mmap(NULL, (mmap_pages+1)*page_size,
413 PROT_READ, MAP_SHARED, fd[nr_cpu][counter], 0);
414 if (mmap_array[nr_cpu][counter].base == MAP_FAILED) {
415 error("failed to mmap with %d (%s)\n", errno, strerror(errno));
416 exit(-1);
417 }
Peter Zijlstra4502d772009-06-10 15:03:06 +0200418
419 ioctl(fd[nr_cpu][counter], PERF_COUNTER_IOC_ENABLE);
Ingo Molnarf250c0302009-06-05 13:18:41 +0200420}
421
422static void open_counters(int cpu, pid_t pid)
423{
424 int counter;
425
Arnaldo Carvalho de Melo1a853e32009-05-14 22:50:46 -0300426 if (pid > 0) {
Peter Zijlstraf70e87d2009-06-02 14:13:24 +0200427 pid_synthesize_comm_event(pid, 0);
Ingo Molnar2debbc82009-06-05 14:29:10 +0200428 pid_synthesize_mmap_samples(pid);
Arnaldo Carvalho de Melo1a853e32009-05-14 22:50:46 -0300429 }
Peter Zijlstra16c8a102009-05-05 17:50:27 +0200430
431 group_fd = -1;
Ingo Molnarf250c0302009-06-05 13:18:41 +0200432 for (counter = 0; counter < nr_counters; counter++)
433 create_counter(counter, cpu, pid);
Peter Zijlstra16c8a102009-05-05 17:50:27 +0200434
Peter Zijlstra16c8a102009-05-05 17:50:27 +0200435 nr_cpu++;
436}
437
Ingo Molnar0e9b20b2009-05-26 09:17:18 +0200438static int __cmd_record(int argc, const char **argv)
Peter Zijlstra16c8a102009-05-05 17:50:27 +0200439{
440 int i, counter;
Peter Zijlstra97124d52009-06-02 15:52:24 +0200441 struct stat st;
Ingo Molnarabaff322009-06-02 22:59:57 +0200442 pid_t pid;
443 int flags;
444 int ret;
Peter Zijlstrade9ac072009-04-08 15:01:31 +0200445
446 page_size = sysconf(_SC_PAGE_SIZE);
Peter Zijlstrade9ac072009-04-08 15:01:31 +0200447 nr_cpus = sysconf(_SC_NPROCESSORS_ONLN);
448 assert(nr_cpus <= MAX_NR_CPUS);
449 assert(nr_cpus >= 0);
450
Ingo Molnarabaff322009-06-02 22:59:57 +0200451 if (!stat(output_name, &st) && !force && !append_file) {
452 fprintf(stderr, "Error, output file %s exists, use -A to append or -f to overwrite.\n",
Peter Zijlstra97124d52009-06-02 15:52:24 +0200453 output_name);
454 exit(-1);
455 }
456
Ingo Molnarabaff322009-06-02 22:59:57 +0200457 flags = O_CREAT|O_RDWR;
458 if (append_file)
459 flags |= O_APPEND;
460 else
461 flags |= O_TRUNC;
462
463 output = open(output_name, flags, S_IRUSR|S_IWUSR);
Peter Zijlstrade9ac072009-04-08 15:01:31 +0200464 if (output < 0) {
465 perror("failed to create output file");
466 exit(-1);
467 }
468
Arnaldo Carvalho de Melo1a853e32009-05-14 22:50:46 -0300469 if (!system_wide) {
Ingo Molnardf979922009-06-04 13:41:22 +0200470 open_counters(-1, target_pid != -1 ? target_pid : getpid());
Arnaldo Carvalho de Melo1a853e32009-05-14 22:50:46 -0300471 } else for (i = 0; i < nr_cpus; i++)
472 open_counters(i, target_pid);
Peter Zijlstrade9ac072009-04-08 15:01:31 +0200473
Peter Zijlstraf7b7c262009-06-10 15:55:59 +0200474 atexit(sig_atexit);
Peter Zijlstra16c8a102009-05-05 17:50:27 +0200475 signal(SIGCHLD, sig_handler);
476 signal(SIGINT, sig_handler);
Peter Zijlstrade9ac072009-04-08 15:01:31 +0200477
Mike Galbraithef65b2a2009-05-27 10:10:51 +0200478 if (target_pid == -1 && argc) {
Arnaldo Carvalho de Melo1a853e32009-05-14 22:50:46 -0300479 pid = fork();
480 if (pid < 0)
481 perror("failed to fork");
Peter Zijlstrade9ac072009-04-08 15:01:31 +0200482
Arnaldo Carvalho de Melo1a853e32009-05-14 22:50:46 -0300483 if (!pid) {
Ingo Molnar0e9b20b2009-05-26 09:17:18 +0200484 if (execvp(argv[0], (char **)argv)) {
Arnaldo Carvalho de Melo1a853e32009-05-14 22:50:46 -0300485 perror(argv[0]);
486 exit(-1);
487 }
Peter Zijlstrade9ac072009-04-08 15:01:31 +0200488 }
489 }
490
491 if (realtime_prio) {
492 struct sched_param param;
493
494 param.sched_priority = realtime_prio;
495 if (sched_setscheduler(0, SCHED_FIFO, &param)) {
496 printf("Could not set realtime priority.\n");
497 exit(-1);
498 }
499 }
500
Peter Zijlstraf70e87d2009-06-02 14:13:24 +0200501 if (system_wide)
Ingo Molnar2debbc82009-06-05 14:29:10 +0200502 synthesize_samples();
Peter Zijlstrade9ac072009-04-08 15:01:31 +0200503
504 while (!done) {
Ingo Molnar2debbc82009-06-05 14:29:10 +0200505 int hits = samples;
Peter Zijlstrade9ac072009-04-08 15:01:31 +0200506
Peter Zijlstra16c8a102009-05-05 17:50:27 +0200507 for (i = 0; i < nr_cpu; i++) {
Peter Zijlstrade9ac072009-04-08 15:01:31 +0200508 for (counter = 0; counter < nr_counters; counter++)
509 mmap_read(&mmap_array[i][counter]);
510 }
511
Ingo Molnar2debbc82009-06-05 14:29:10 +0200512 if (hits == samples)
Peter Zijlstrade9ac072009-04-08 15:01:31 +0200513 ret = poll(event_array, nr_poll, 100);
514 }
515
Ingo Molnar021e9f42009-06-03 19:27:19 +0200516 /*
517 * Approximate RIP event size: 24 bytes.
518 */
519 fprintf(stderr,
Ingo Molnar2debbc82009-06-05 14:29:10 +0200520 "[ perf record: Captured and wrote %.3f MB %s (~%lld samples) ]\n",
Ingo Molnar021e9f42009-06-03 19:27:19 +0200521 (double)bytes_written / 1024.0 / 1024.0,
522 output_name,
523 bytes_written / 24);
Ingo Molnaraddc2782009-06-02 23:43:11 +0200524
Peter Zijlstrade9ac072009-04-08 15:01:31 +0200525 return 0;
526}
Ingo Molnar0e9b20b2009-05-26 09:17:18 +0200527
Ingo Molnar0e9b20b2009-05-26 09:17:18 +0200528static const char * const record_usage[] = {
Mike Galbraith9e0967532009-05-28 16:25:34 +0200529 "perf record [<options>] [<command>]",
530 "perf record [<options>] -- <command> [<options>]",
Ingo Molnar0e9b20b2009-05-26 09:17:18 +0200531 NULL
532};
533
Ingo Molnar52425192009-05-26 09:17:18 +0200534static const struct option options[] = {
Ingo Molnar0e9b20b2009-05-26 09:17:18 +0200535 OPT_CALLBACK('e', "event", NULL, "event",
Thomas Gleixner86847b62009-06-06 12:24:17 +0200536 "event selector. use 'perf list' to list available events",
537 parse_events),
Ingo Molnar0e9b20b2009-05-26 09:17:18 +0200538 OPT_INTEGER('p', "pid", &target_pid,
539 "record events on existing pid"),
540 OPT_INTEGER('r', "realtime", &realtime_prio,
541 "collect data with this RT SCHED_FIFO priority"),
542 OPT_BOOLEAN('a', "all-cpus", &system_wide,
543 "system-wide collection from all CPUs"),
Ingo Molnarabaff322009-06-02 22:59:57 +0200544 OPT_BOOLEAN('A', "append", &append_file,
545 "append to the output file to do incremental profiling"),
Peter Zijlstra97124d52009-06-02 15:52:24 +0200546 OPT_BOOLEAN('f', "force", &force,
547 "overwrite existing data file"),
Peter Zijlstrae61078a2009-06-03 11:24:33 +0200548 OPT_LONG('c', "count", &default_interval,
Ingo Molnarabaff322009-06-02 22:59:57 +0200549 "event period to sample"),
550 OPT_STRING('o', "output", &output_name, "file",
551 "output file name"),
552 OPT_BOOLEAN('i', "inherit", &inherit,
553 "child tasks inherit counters"),
Ingo Molnarcf1f4572009-06-05 13:27:02 +0200554 OPT_INTEGER('F', "freq", &freq,
555 "profile at this frequency"),
Ingo Molnarabaff322009-06-02 22:59:57 +0200556 OPT_INTEGER('m', "mmap-pages", &mmap_pages,
557 "number of mmap data pages"),
Ingo Molnar3da297a2009-06-07 17:39:02 +0200558 OPT_BOOLEAN('v', "verbose", &verbose,
559 "be more verbose (show counter open errors, etc)"),
Ingo Molnar0e9b20b2009-05-26 09:17:18 +0200560 OPT_END()
561};
562
563int cmd_record(int argc, const char **argv, const char *prefix)
564{
565 int counter;
566
Ingo Molnar0e9b20b2009-05-26 09:17:18 +0200567 argc = parse_options(argc, argv, options, record_usage, 0);
Mike Galbraithef65b2a2009-05-27 10:10:51 +0200568 if (!argc && target_pid == -1 && !system_wide)
Ingo Molnar0e9b20b2009-05-26 09:17:18 +0200569 usage_with_options(record_usage, options);
570
Peter Zijlstrabbd36e52009-06-11 23:11:50 +0200571 if (!nr_counters) {
572 nr_counters = 1;
573 attrs[0].type = PERF_TYPE_HARDWARE;
574 attrs[0].config = PERF_COUNT_HW_CPU_CYCLES;
575 }
Ingo Molnar0e9b20b2009-05-26 09:17:18 +0200576
577 for (counter = 0; counter < nr_counters; counter++) {
Ingo Molnara21ca2c2009-06-06 09:58:57 +0200578 if (attrs[counter].sample_period)
Ingo Molnar0e9b20b2009-05-26 09:17:18 +0200579 continue;
580
Ingo Molnara21ca2c2009-06-06 09:58:57 +0200581 attrs[counter].sample_period = default_interval;
Ingo Molnar0e9b20b2009-05-26 09:17:18 +0200582 }
583
584 return __cmd_record(argc, argv);
585}