blob: 65b4115e417d28547b9fa0b933f14010b3a052e6 [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"
Peter Zijlstra7c6a1c62009-06-25 17:05:54 +020019
Peter Zijlstra97124d52009-06-02 15:52:24 +020020#include <unistd.h>
Peter Zijlstrade9ac072009-04-08 15:01:31 +020021#include <sched.h>
Peter Zijlstrade9ac072009-04-08 15:01:31 +020022
Ingo Molnar0e9b20b2009-05-26 09:17:18 +020023#define ALIGN(x, a) __ALIGN_MASK(x, (typeof(x))(a)-1)
24#define __ALIGN_MASK(x, mask) (((x)+(mask))&~(mask))
Arnaldo Carvalho de Melo1a853e32009-05-14 22:50:46 -030025
Peter Zijlstrade9ac072009-04-08 15:01:31 +020026static int fd[MAX_NR_CPUS][MAX_COUNTERS];
Ingo Molnara21ca2c2009-06-06 09:58:57 +020027
28static long default_interval = 100000;
29
Ingo Molnar3cf165f2009-06-02 23:02:59 +020030static int nr_cpus = 0;
Peter Zijlstrade9ac072009-04-08 15:01:31 +020031static unsigned int page_size;
Ingo Molnar3cf165f2009-06-02 23:02:59 +020032static unsigned int mmap_pages = 128;
Ingo Molnarcf1f4572009-06-05 13:27:02 +020033static int freq = 0;
Peter Zijlstrade9ac072009-04-08 15:01:31 +020034static int output;
Ingo Molnar23ac9cb2009-05-27 09:33:18 +020035static const char *output_name = "perf.data";
Peter Zijlstrade9ac072009-04-08 15:01:31 +020036static int group = 0;
Peter Zijlstra16c8a102009-05-05 17:50:27 +020037static unsigned int realtime_prio = 0;
Frederic Weisbeckerdaac07b2009-08-13 10:27:19 +020038static int raw_samples = 0;
Peter Zijlstra16c8a102009-05-05 17:50:27 +020039static int system_wide = 0;
Jens Axboe0a5ac842009-08-12 11:18:01 +020040static int profile_cpu = -1;
Arnaldo Carvalho de Melo1a853e32009-05-14 22:50:46 -030041static pid_t target_pid = -1;
Peter Zijlstra16c8a102009-05-05 17:50:27 +020042static int inherit = 1;
Peter Zijlstra97124d52009-06-02 15:52:24 +020043static int force = 0;
Ingo Molnarabaff322009-06-02 22:59:57 +020044static int append_file = 0;
Ingo Molnar3efa1cc92009-06-14 15:04:15 +020045static int call_graph = 0;
Peter Zijlstra649c48a2009-06-24 21:12:48 +020046static int inherit_stat = 0;
47static int no_samples = 0;
Anton Blanchard4bba8282009-07-16 15:44:29 +020048static int sample_address = 0;
Peter Zijlstrade9ac072009-04-08 15:01:31 +020049
Ingo Molnara21ca2c2009-06-06 09:58:57 +020050static long samples;
51static struct timeval last_read;
52static struct timeval this_read;
53
Paul Mackerras9cffa8d2009-06-19 22:21:42 +100054static u64 bytes_written;
Ingo Molnara21ca2c2009-06-06 09:58:57 +020055
56static struct pollfd event_array[MAX_NR_CPUS * MAX_COUNTERS];
57
58static int nr_poll;
59static int nr_cpu;
60
Peter Zijlstraf5970552009-06-18 23:22:55 +020061static int file_new = 1;
Peter Zijlstra7c6a1c62009-06-25 17:05:54 +020062
63struct perf_header *header;
Peter Zijlstraf5970552009-06-18 23:22:55 +020064
Ingo Molnara21ca2c2009-06-06 09:58:57 +020065struct mmap_data {
66 int counter;
67 void *base;
68 unsigned int mask;
69 unsigned int prev;
70};
71
72static struct mmap_data mmap_array[MAX_NR_CPUS][MAX_COUNTERS];
73
Peter Zijlstra9d91a6f2009-06-18 11:40:28 +020074static unsigned long mmap_read_head(struct mmap_data *md)
Peter Zijlstrade9ac072009-04-08 15:01:31 +020075{
76 struct perf_counter_mmap_page *pc = md->base;
Peter Zijlstra9d91a6f2009-06-18 11:40:28 +020077 long head;
Peter Zijlstrade9ac072009-04-08 15:01:31 +020078
79 head = pc->data_head;
80 rmb();
81
82 return head;
83}
84
Peter Zijlstra9d91a6f2009-06-18 11:40:28 +020085static void mmap_write_tail(struct mmap_data *md, unsigned long tail)
86{
87 struct perf_counter_mmap_page *pc = md->base;
88
89 /*
90 * ensure all reads are done before we write the tail out.
91 */
92 /* mb(); */
93 pc->data_tail = tail;
94}
95
Peter Zijlstraf5970552009-06-18 23:22:55 +020096static void write_output(void *buf, size_t size)
97{
98 while (size) {
99 int ret = write(output, buf, size);
100
101 if (ret < 0)
102 die("failed to write");
103
104 size -= ret;
105 buf += ret;
106
107 bytes_written += ret;
108 }
109}
110
Peter Zijlstrade9ac072009-04-08 15:01:31 +0200111static void mmap_read(struct mmap_data *md)
112{
113 unsigned int head = mmap_read_head(md);
114 unsigned int old = md->prev;
115 unsigned char *data = md->base + page_size;
116 unsigned long size;
117 void *buf;
118 int diff;
119
120 gettimeofday(&this_read, NULL);
121
122 /*
123 * If we're further behind than half the buffer, there's a chance
Ingo Molnar2debbc82009-06-05 14:29:10 +0200124 * the writer will bite our tail and mess up the samples under us.
Peter Zijlstrade9ac072009-04-08 15:01:31 +0200125 *
126 * If we somehow ended up ahead of the head, we got messed up.
127 *
128 * In either case, truncate and restart at head.
129 */
130 diff = head - old;
Peter Zijlstra9d91a6f2009-06-18 11:40:28 +0200131 if (diff < 0) {
Peter Zijlstrade9ac072009-04-08 15:01:31 +0200132 struct timeval iv;
133 unsigned long msecs;
134
135 timersub(&this_read, &last_read, &iv);
136 msecs = iv.tv_sec*1000 + iv.tv_usec/1000;
137
138 fprintf(stderr, "WARNING: failed to keep up with mmap data."
139 " Last read %lu msecs ago.\n", msecs);
140
141 /*
142 * head points to a known good entry, start there.
143 */
144 old = head;
145 }
146
147 last_read = this_read;
148
149 if (old != head)
Ingo Molnar2debbc82009-06-05 14:29:10 +0200150 samples++;
Peter Zijlstrade9ac072009-04-08 15:01:31 +0200151
152 size = head - old;
153
154 if ((old & md->mask) + size != (head & md->mask)) {
155 buf = &data[old & md->mask];
156 size = md->mask + 1 - (old & md->mask);
157 old += size;
Ingo Molnar021e9f42009-06-03 19:27:19 +0200158
Peter Zijlstraf5970552009-06-18 23:22:55 +0200159 write_output(buf, size);
Peter Zijlstrade9ac072009-04-08 15:01:31 +0200160 }
161
162 buf = &data[old & md->mask];
163 size = head - old;
164 old += size;
Ingo Molnar021e9f42009-06-03 19:27:19 +0200165
Peter Zijlstraf5970552009-06-18 23:22:55 +0200166 write_output(buf, size);
Peter Zijlstrade9ac072009-04-08 15:01:31 +0200167
168 md->prev = old;
Peter Zijlstra9d91a6f2009-06-18 11:40:28 +0200169 mmap_write_tail(md, old);
Peter Zijlstrade9ac072009-04-08 15:01:31 +0200170}
171
172static volatile int done = 0;
Peter Zijlstraf7b7c262009-06-10 15:55:59 +0200173static volatile int signr = -1;
Peter Zijlstrade9ac072009-04-08 15:01:31 +0200174
Peter Zijlstra16c8a102009-05-05 17:50:27 +0200175static void sig_handler(int sig)
Peter Zijlstrade9ac072009-04-08 15:01:31 +0200176{
Peter Zijlstra16c8a102009-05-05 17:50:27 +0200177 done = 1;
Peter Zijlstraf7b7c262009-06-10 15:55:59 +0200178 signr = sig;
179}
180
181static void sig_atexit(void)
182{
183 if (signr == -1)
184 return;
185
186 signal(signr, SIG_DFL);
187 kill(getpid(), signr);
Peter Zijlstrade9ac072009-04-08 15:01:31 +0200188}
189
Arnaldo Carvalho de Melo2a8083f2009-08-11 16:22:00 -0300190static pid_t pid_synthesize_comm_event(pid_t pid, int full)
Arnaldo Carvalho de Melo1a853e32009-05-14 22:50:46 -0300191{
Arnaldo Carvalho de Melo1a853e32009-05-14 22:50:46 -0300192 struct comm_event comm_ev;
Ingo Molnar16f762a2009-05-27 09:10:38 +0200193 char filename[PATH_MAX];
Ingo Molnar16f762a2009-05-27 09:10:38 +0200194 char bf[BUFSIZ];
Arnaldo Carvalho de Melo2a8083f2009-08-11 16:22:00 -0300195 FILE *fp;
196 size_t size = 0;
Peter Zijlstraf70e87d2009-06-02 14:13:24 +0200197 DIR *tasks;
198 struct dirent dirent, *next;
Arnaldo Carvalho de Melo2a8083f2009-08-11 16:22:00 -0300199 pid_t tgid = 0;
Arnaldo Carvalho de Melo1a853e32009-05-14 22:50:46 -0300200
Arnaldo Carvalho de Melo2a8083f2009-08-11 16:22:00 -0300201 snprintf(filename, sizeof(filename), "/proc/%d/status", pid);
Arnaldo Carvalho de Melo1a853e32009-05-14 22:50:46 -0300202
Arnaldo Carvalho de Melo2a8083f2009-08-11 16:22:00 -0300203 fp = fopen(filename, "r");
Arnaldo Carvalho de Melo39e6dd72009-08-14 15:26:32 -0300204 if (fp == NULL) {
Ingo Molnar613d8602009-06-15 08:17:12 +0200205 /*
206 * We raced with a task exiting - just return:
207 */
208 if (verbose)
209 fprintf(stderr, "couldn't open %s\n", filename);
Arnaldo Carvalho de Melo2a8083f2009-08-11 16:22:00 -0300210 return 0;
Arnaldo Carvalho de Melo1a853e32009-05-14 22:50:46 -0300211 }
Arnaldo Carvalho de Melo1a853e32009-05-14 22:50:46 -0300212
Arnaldo Carvalho de Melo1a853e32009-05-14 22:50:46 -0300213 memset(&comm_ev, 0, sizeof(comm_ev));
Arnaldo Carvalho de Melo2a8083f2009-08-11 16:22:00 -0300214 while (!comm_ev.comm[0] || !comm_ev.pid) {
215 if (fgets(bf, sizeof(bf), fp) == NULL)
216 goto out_failure;
Peter Zijlstraf70e87d2009-06-02 14:13:24 +0200217
Arnaldo Carvalho de Melo2a8083f2009-08-11 16:22:00 -0300218 if (memcmp(bf, "Name:", 5) == 0) {
219 char *name = bf + 5;
220 while (*name && isspace(*name))
221 ++name;
222 size = strlen(name) - 1;
223 memcpy(comm_ev.comm, name, size++);
224 } else if (memcmp(bf, "Tgid:", 5) == 0) {
225 char *tgids = bf + 5;
226 while (*tgids && isspace(*tgids))
227 ++tgids;
228 tgid = comm_ev.pid = atoi(tgids);
229 }
230 }
231
Arnaldo Carvalho de Melo1a853e32009-05-14 22:50:46 -0300232 comm_ev.header.type = PERF_EVENT_COMM;
Paul Mackerras9cffa8d2009-06-19 22:21:42 +1000233 size = ALIGN(size, sizeof(u64));
Arnaldo Carvalho de Melo1a853e32009-05-14 22:50:46 -0300234 comm_ev.header.size = sizeof(comm_ev) - (sizeof(comm_ev.comm) - size);
Ingo Molnar16f762a2009-05-27 09:10:38 +0200235
Peter Zijlstraf70e87d2009-06-02 14:13:24 +0200236 if (!full) {
237 comm_ev.tid = pid;
238
Peter Zijlstraf5970552009-06-18 23:22:55 +0200239 write_output(&comm_ev, comm_ev.header.size);
Arnaldo Carvalho de Melo2a8083f2009-08-11 16:22:00 -0300240 goto out_fclose;
Arnaldo Carvalho de Melo1a853e32009-05-14 22:50:46 -0300241 }
Peter Zijlstraf70e87d2009-06-02 14:13:24 +0200242
243 snprintf(filename, sizeof(filename), "/proc/%d/task", pid);
244
245 tasks = opendir(filename);
246 while (!readdir_r(tasks, &dirent, &next) && next) {
247 char *end;
248 pid = strtol(dirent.d_name, &end, 10);
249 if (*end)
250 continue;
251
252 comm_ev.tid = pid;
253
Peter Zijlstraf5970552009-06-18 23:22:55 +0200254 write_output(&comm_ev, comm_ev.header.size);
Peter Zijlstraf70e87d2009-06-02 14:13:24 +0200255 }
256 closedir(tasks);
Arnaldo Carvalho de Melo2a8083f2009-08-11 16:22:00 -0300257
258out_fclose:
259 fclose(fp);
260 return tgid;
Peter Zijlstraf70e87d2009-06-02 14:13:24 +0200261
Arnaldo Carvalho de Meloa0055ae2009-06-01 17:50:19 -0300262out_failure:
263 fprintf(stderr, "couldn't get COMM and pgid, malformed %s\n",
264 filename);
265 exit(EXIT_FAILURE);
Arnaldo Carvalho de Melo1a853e32009-05-14 22:50:46 -0300266}
267
Arnaldo Carvalho de Melo2a8083f2009-08-11 16:22:00 -0300268static void pid_synthesize_mmap_samples(pid_t pid, pid_t tgid)
Arnaldo Carvalho de Melo1a853e32009-05-14 22:50:46 -0300269{
270 char filename[PATH_MAX];
271 FILE *fp;
272
273 snprintf(filename, sizeof(filename), "/proc/%d/maps", pid);
274
275 fp = fopen(filename, "r");
276 if (fp == NULL) {
Ingo Molnar613d8602009-06-15 08:17:12 +0200277 /*
278 * We raced with a task exiting - just return:
279 */
280 if (verbose)
281 fprintf(stderr, "couldn't open %s\n", filename);
282 return;
Arnaldo Carvalho de Melo1a853e32009-05-14 22:50:46 -0300283 }
284 while (1) {
Arnaldo Carvalho de Meloa0055ae2009-06-01 17:50:19 -0300285 char bf[BUFSIZ], *pbf = bf;
Arnaldo Carvalho de Melo1a853e32009-05-14 22:50:46 -0300286 struct mmap_event mmap_ev = {
Ingo Molnarf37a2912009-07-01 12:37:06 +0200287 .header = { .type = PERF_EVENT_MMAP },
Arnaldo Carvalho de Melo1a853e32009-05-14 22:50:46 -0300288 };
Arnaldo Carvalho de Meloa0055ae2009-06-01 17:50:19 -0300289 int n;
Arnaldo Carvalho de Melo1a853e32009-05-14 22:50:46 -0300290 size_t size;
291 if (fgets(bf, sizeof(bf), fp) == NULL)
292 break;
293
294 /* 00400000-0040c000 r-xp 00000000 fd:01 41038 /bin/cat */
Arnaldo Carvalho de Meloa0055ae2009-06-01 17:50:19 -0300295 n = hex2u64(pbf, &mmap_ev.start);
296 if (n < 0)
297 continue;
298 pbf += n + 1;
299 n = hex2u64(pbf, &mmap_ev.len);
300 if (n < 0)
301 continue;
302 pbf += n + 3;
303 if (*pbf == 'x') { /* vm_exec */
Johannes Weiner76c64c52009-06-24 21:08:36 +0200304 char *execname = strchr(bf, '/');
Arnaldo Carvalho de Melo1a853e32009-05-14 22:50:46 -0300305
Anton Blanchard11b5f812009-07-16 15:44:29 +0200306 /* Catch VDSO */
307 if (execname == NULL)
308 execname = strstr(bf, "[vdso]");
309
Johannes Weiner76c64c52009-06-24 21:08:36 +0200310 if (execname == NULL)
Arnaldo Carvalho de Melo1a853e32009-05-14 22:50:46 -0300311 continue;
312
Arnaldo Carvalho de Melo1a853e32009-05-14 22:50:46 -0300313 size = strlen(execname);
314 execname[size - 1] = '\0'; /* Remove \n */
315 memcpy(mmap_ev.filename, execname, size);
Paul Mackerras9cffa8d2009-06-19 22:21:42 +1000316 size = ALIGN(size, sizeof(u64));
Arnaldo Carvalho de Melo1a853e32009-05-14 22:50:46 -0300317 mmap_ev.len -= mmap_ev.start;
318 mmap_ev.header.size = (sizeof(mmap_ev) -
319 (sizeof(mmap_ev.filename) - size));
Arnaldo Carvalho de Melo2a8083f2009-08-11 16:22:00 -0300320 mmap_ev.pid = tgid;
Arnaldo Carvalho de Melo1a853e32009-05-14 22:50:46 -0300321 mmap_ev.tid = pid;
322
Peter Zijlstraf5970552009-06-18 23:22:55 +0200323 write_output(&mmap_ev, mmap_ev.header.size);
Arnaldo Carvalho de Melo1a853e32009-05-14 22:50:46 -0300324 }
325 }
326
327 fclose(fp);
328}
329
Peter Zijlstra7c6a1c62009-06-25 17:05:54 +0200330static void synthesize_all(void)
Peter Zijlstraf70e87d2009-06-02 14:13:24 +0200331{
332 DIR *proc;
333 struct dirent dirent, *next;
334
335 proc = opendir("/proc");
336
337 while (!readdir_r(proc, &dirent, &next) && next) {
338 char *end;
Arnaldo Carvalho de Melo2a8083f2009-08-11 16:22:00 -0300339 pid_t pid, tgid;
Peter Zijlstraf70e87d2009-06-02 14:13:24 +0200340
341 pid = strtol(dirent.d_name, &end, 10);
342 if (*end) /* only interested in proper numerical dirents */
343 continue;
344
Arnaldo Carvalho de Melo2a8083f2009-08-11 16:22:00 -0300345 tgid = pid_synthesize_comm_event(pid, 1);
346 pid_synthesize_mmap_samples(pid, tgid);
Peter Zijlstraf70e87d2009-06-02 14:13:24 +0200347 }
348
349 closedir(proc);
350}
351
Ingo Molnarf250c0302009-06-05 13:18:41 +0200352static int group_fd;
353
Peter Zijlstra7c6a1c62009-06-25 17:05:54 +0200354static struct perf_header_attr *get_header_attr(struct perf_counter_attr *a, int nr)
355{
356 struct perf_header_attr *h_attr;
357
358 if (nr < header->attrs) {
359 h_attr = header->attr[nr];
360 } else {
361 h_attr = perf_header_attr__new(a);
362 perf_header__add_attr(header, h_attr);
363 }
364
365 return h_attr;
366}
367
Ingo Molnarf250c0302009-06-05 13:18:41 +0200368static void create_counter(int counter, int cpu, pid_t pid)
Peter Zijlstrade9ac072009-04-08 15:01:31 +0200369{
Ingo Molnara21ca2c2009-06-06 09:58:57 +0200370 struct perf_counter_attr *attr = attrs + counter;
Peter Zijlstra7c6a1c62009-06-25 17:05:54 +0200371 struct perf_header_attr *h_attr;
372 int track = !counter; /* only the first counter needs these */
373 struct {
374 u64 count;
375 u64 time_enabled;
376 u64 time_running;
377 u64 id;
378 } read_data;
379
380 attr->read_format = PERF_FORMAT_TOTAL_TIME_ENABLED |
381 PERF_FORMAT_TOTAL_TIME_RUNNING |
382 PERF_FORMAT_ID;
Peter Zijlstra16c8a102009-05-05 17:50:27 +0200383
Frederic Weisbecker3a9f1312009-08-13 10:27:18 +0200384 attr->sample_type |= PERF_SAMPLE_IP | PERF_SAMPLE_TID;
Ingo Molnar3efa1cc92009-06-14 15:04:15 +0200385
Ingo Molnar1dba15e2009-06-05 18:37:22 +0200386 if (freq) {
Peter Zijlstraea1900e2009-06-10 21:45:22 +0200387 attr->sample_type |= PERF_SAMPLE_PERIOD;
Ingo Molnara21ca2c2009-06-06 09:58:57 +0200388 attr->freq = 1;
389 attr->sample_freq = freq;
Ingo Molnar1dba15e2009-06-05 18:37:22 +0200390 }
Ingo Molnar3efa1cc92009-06-14 15:04:15 +0200391
Peter Zijlstra649c48a2009-06-24 21:12:48 +0200392 if (no_samples)
393 attr->sample_freq = 0;
394
395 if (inherit_stat)
396 attr->inherit_stat = 1;
397
Anton Blanchard4bba8282009-07-16 15:44:29 +0200398 if (sample_address)
399 attr->sample_type |= PERF_SAMPLE_ADDR;
400
Ingo Molnar3efa1cc92009-06-14 15:04:15 +0200401 if (call_graph)
402 attr->sample_type |= PERF_SAMPLE_CALLCHAIN;
403
Frederic Weisbeckerdaac07b2009-08-13 10:27:19 +0200404 if (raw_samples)
405 attr->sample_type |= PERF_SAMPLE_RAW;
Frederic Weisbeckerf413cdb2009-08-07 01:25:54 +0200406
Ingo Molnara21ca2c2009-06-06 09:58:57 +0200407 attr->mmap = track;
408 attr->comm = track;
409 attr->inherit = (cpu < 0) && inherit;
Peter Zijlstra4502d772009-06-10 15:03:06 +0200410 attr->disabled = 1;
Ingo Molnarf250c0302009-06-05 13:18:41 +0200411
Ingo Molnar3da297a2009-06-07 17:39:02 +0200412try_again:
Ingo Molnara21ca2c2009-06-06 09:58:57 +0200413 fd[nr_cpu][counter] = sys_perf_counter_open(attr, pid, cpu, group_fd, 0);
Ingo Molnarf250c0302009-06-05 13:18:41 +0200414
415 if (fd[nr_cpu][counter] < 0) {
416 int err = errno;
417
Ingo Molnarf250c0302009-06-05 13:18:41 +0200418 if (err == EPERM)
Ingo Molnar3da297a2009-06-07 17:39:02 +0200419 die("Permission error - are you root?\n");
Jens Axboe0a5ac842009-08-12 11:18:01 +0200420 else if (err == ENODEV && profile_cpu != -1)
421 die("No such device - did you specify an out-of-range profile CPU?\n");
Ingo Molnar3da297a2009-06-07 17:39:02 +0200422
423 /*
424 * If it's cycles then fall back to hrtimer
425 * based cpu-clock-tick sw counter, which
426 * is always available even if no PMU support:
427 */
428 if (attr->type == PERF_TYPE_HARDWARE
Peter Zijlstraf4dbfa82009-06-11 14:06:28 +0200429 && attr->config == PERF_COUNT_HW_CPU_CYCLES) {
Ingo Molnar3da297a2009-06-07 17:39:02 +0200430
431 if (verbose)
432 warning(" ... trying to fall back to cpu-clock-ticks\n");
433 attr->type = PERF_TYPE_SOFTWARE;
Peter Zijlstraf4dbfa82009-06-11 14:06:28 +0200434 attr->config = PERF_COUNT_SW_CPU_CLOCK;
Ingo Molnar3da297a2009-06-07 17:39:02 +0200435 goto try_again;
436 }
Ingo Molnar30c806a2009-06-07 17:46:24 +0200437 printf("\n");
438 error("perfcounter syscall returned with %d (%s)\n",
439 fd[nr_cpu][counter], strerror(err));
440 die("No CONFIG_PERF_COUNTERS=y kernel support configured?\n");
Ingo Molnarf250c0302009-06-05 13:18:41 +0200441 exit(-1);
442 }
Ingo Molnar3da297a2009-06-07 17:39:02 +0200443
Peter Zijlstra7c6a1c62009-06-25 17:05:54 +0200444 h_attr = get_header_attr(attr, counter);
445
446 if (!file_new) {
447 if (memcmp(&h_attr->attr, attr, sizeof(*attr))) {
448 fprintf(stderr, "incompatible append\n");
449 exit(-1);
450 }
451 }
452
Frederic Weisbecker3928ddb2009-06-25 22:21:27 +0200453 if (read(fd[nr_cpu][counter], &read_data, sizeof(read_data)) == -1) {
454 perror("Unable to read perf file descriptor\n");
455 exit(-1);
456 }
Peter Zijlstra7c6a1c62009-06-25 17:05:54 +0200457
458 perf_header_attr__add_id(h_attr, read_data.id);
459
Ingo Molnarf250c0302009-06-05 13:18:41 +0200460 assert(fd[nr_cpu][counter] >= 0);
461 fcntl(fd[nr_cpu][counter], F_SETFL, O_NONBLOCK);
462
463 /*
464 * First counter acts as the group leader:
465 */
466 if (group && group_fd == -1)
467 group_fd = fd[nr_cpu][counter];
468
469 event_array[nr_poll].fd = fd[nr_cpu][counter];
470 event_array[nr_poll].events = POLLIN;
471 nr_poll++;
472
473 mmap_array[nr_cpu][counter].counter = counter;
474 mmap_array[nr_cpu][counter].prev = 0;
475 mmap_array[nr_cpu][counter].mask = mmap_pages*page_size - 1;
476 mmap_array[nr_cpu][counter].base = mmap(NULL, (mmap_pages+1)*page_size,
Peter Zijlstra9d91a6f2009-06-18 11:40:28 +0200477 PROT_READ|PROT_WRITE, MAP_SHARED, fd[nr_cpu][counter], 0);
Ingo Molnarf250c0302009-06-05 13:18:41 +0200478 if (mmap_array[nr_cpu][counter].base == MAP_FAILED) {
479 error("failed to mmap with %d (%s)\n", errno, strerror(errno));
480 exit(-1);
481 }
Peter Zijlstra4502d772009-06-10 15:03:06 +0200482
483 ioctl(fd[nr_cpu][counter], PERF_COUNTER_IOC_ENABLE);
Ingo Molnarf250c0302009-06-05 13:18:41 +0200484}
485
486static void open_counters(int cpu, pid_t pid)
487{
488 int counter;
489
Peter Zijlstra16c8a102009-05-05 17:50:27 +0200490 group_fd = -1;
Ingo Molnarf250c0302009-06-05 13:18:41 +0200491 for (counter = 0; counter < nr_counters; counter++)
492 create_counter(counter, cpu, pid);
Peter Zijlstra16c8a102009-05-05 17:50:27 +0200493
Peter Zijlstra16c8a102009-05-05 17:50:27 +0200494 nr_cpu++;
495}
496
Peter Zijlstraf5970552009-06-18 23:22:55 +0200497static void atexit_header(void)
498{
Peter Zijlstra7c6a1c62009-06-25 17:05:54 +0200499 header->data_size += bytes_written;
Peter Zijlstraf5970552009-06-18 23:22:55 +0200500
Peter Zijlstra7c6a1c62009-06-25 17:05:54 +0200501 perf_header__write(header, output);
Peter Zijlstraf5970552009-06-18 23:22:55 +0200502}
503
Ingo Molnar0e9b20b2009-05-26 09:17:18 +0200504static int __cmd_record(int argc, const char **argv)
Peter Zijlstra16c8a102009-05-05 17:50:27 +0200505{
506 int i, counter;
Peter Zijlstra97124d52009-06-02 15:52:24 +0200507 struct stat st;
Peter Zijlstra7c6a1c62009-06-25 17:05:54 +0200508 pid_t pid = 0;
Ingo Molnarabaff322009-06-02 22:59:57 +0200509 int flags;
510 int ret;
Peter Zijlstrade9ac072009-04-08 15:01:31 +0200511
512 page_size = sysconf(_SC_PAGE_SIZE);
Peter Zijlstrade9ac072009-04-08 15:01:31 +0200513 nr_cpus = sysconf(_SC_NPROCESSORS_ONLN);
514 assert(nr_cpus <= MAX_NR_CPUS);
515 assert(nr_cpus >= 0);
516
Peter Zijlstraf5970552009-06-18 23:22:55 +0200517 atexit(sig_atexit);
518 signal(SIGCHLD, sig_handler);
519 signal(SIGINT, sig_handler);
520
Pierre Habouzit266e0e22009-08-07 14:16:01 +0200521 if (!stat(output_name, &st) && st.st_size) {
522 if (!force && !append_file) {
523 fprintf(stderr, "Error, output file %s exists, use -A to append or -f to overwrite.\n",
524 output_name);
525 exit(-1);
526 }
527 } else {
528 append_file = 0;
Peter Zijlstra97124d52009-06-02 15:52:24 +0200529 }
530
Ingo Molnarabaff322009-06-02 22:59:57 +0200531 flags = O_CREAT|O_RDWR;
532 if (append_file)
Peter Zijlstraf5970552009-06-18 23:22:55 +0200533 file_new = 0;
Ingo Molnarabaff322009-06-02 22:59:57 +0200534 else
535 flags |= O_TRUNC;
536
537 output = open(output_name, flags, S_IRUSR|S_IWUSR);
Peter Zijlstrade9ac072009-04-08 15:01:31 +0200538 if (output < 0) {
539 perror("failed to create output file");
540 exit(-1);
541 }
542
Peter Zijlstra7c6a1c62009-06-25 17:05:54 +0200543 if (!file_new)
544 header = perf_header__read(output);
545 else
546 header = perf_header__new();
Peter Zijlstraf5970552009-06-18 23:22:55 +0200547
548 atexit(atexit_header);
549
Arnaldo Carvalho de Melo1a853e32009-05-14 22:50:46 -0300550 if (!system_wide) {
Peter Zijlstra7c6a1c62009-06-25 17:05:54 +0200551 pid = target_pid;
552 if (pid == -1)
553 pid = getpid();
554
Jens Axboe0a5ac842009-08-12 11:18:01 +0200555 open_counters(profile_cpu, pid);
556 } else {
557 if (profile_cpu != -1) {
558 open_counters(profile_cpu, target_pid);
559 } else {
560 for (i = 0; i < nr_cpus; i++)
561 open_counters(i, target_pid);
562 }
563 }
Peter Zijlstrade9ac072009-04-08 15:01:31 +0200564
Peter Zijlstra7c6a1c62009-06-25 17:05:54 +0200565 if (file_new)
566 perf_header__write(header, output);
567
568 if (!system_wide) {
Arnaldo Carvalho de Melo2a8083f2009-08-11 16:22:00 -0300569 pid_t tgid = pid_synthesize_comm_event(pid, 0);
570 pid_synthesize_mmap_samples(pid, tgid);
Peter Zijlstra7c6a1c62009-06-25 17:05:54 +0200571 } else
572 synthesize_all();
573
Mike Galbraithef65b2a2009-05-27 10:10:51 +0200574 if (target_pid == -1 && argc) {
Arnaldo Carvalho de Melo1a853e32009-05-14 22:50:46 -0300575 pid = fork();
576 if (pid < 0)
577 perror("failed to fork");
Peter Zijlstrade9ac072009-04-08 15:01:31 +0200578
Arnaldo Carvalho de Melo1a853e32009-05-14 22:50:46 -0300579 if (!pid) {
Ingo Molnar0e9b20b2009-05-26 09:17:18 +0200580 if (execvp(argv[0], (char **)argv)) {
Arnaldo Carvalho de Melo1a853e32009-05-14 22:50:46 -0300581 perror(argv[0]);
582 exit(-1);
583 }
Peter Zijlstrade9ac072009-04-08 15:01:31 +0200584 }
585 }
586
587 if (realtime_prio) {
588 struct sched_param param;
589
590 param.sched_priority = realtime_prio;
591 if (sched_setscheduler(0, SCHED_FIFO, &param)) {
592 printf("Could not set realtime priority.\n");
593 exit(-1);
594 }
595 }
596
Peter Zijlstra649c48a2009-06-24 21:12:48 +0200597 for (;;) {
Ingo Molnar2debbc82009-06-05 14:29:10 +0200598 int hits = samples;
Peter Zijlstrade9ac072009-04-08 15:01:31 +0200599
Peter Zijlstra16c8a102009-05-05 17:50:27 +0200600 for (i = 0; i < nr_cpu; i++) {
Peter Zijlstrade9ac072009-04-08 15:01:31 +0200601 for (counter = 0; counter < nr_counters; counter++)
602 mmap_read(&mmap_array[i][counter]);
603 }
604
Peter Zijlstra649c48a2009-06-24 21:12:48 +0200605 if (hits == samples) {
606 if (done)
607 break;
Peter Zijlstrade9ac072009-04-08 15:01:31 +0200608 ret = poll(event_array, nr_poll, 100);
Peter Zijlstra649c48a2009-06-24 21:12:48 +0200609 }
Peter Zijlstrade9ac072009-04-08 15:01:31 +0200610 }
611
Ingo Molnar021e9f42009-06-03 19:27:19 +0200612 /*
613 * Approximate RIP event size: 24 bytes.
614 */
615 fprintf(stderr,
Ingo Molnar2debbc82009-06-05 14:29:10 +0200616 "[ perf record: Captured and wrote %.3f MB %s (~%lld samples) ]\n",
Ingo Molnar021e9f42009-06-03 19:27:19 +0200617 (double)bytes_written / 1024.0 / 1024.0,
618 output_name,
619 bytes_written / 24);
Ingo Molnaraddc2782009-06-02 23:43:11 +0200620
Peter Zijlstrade9ac072009-04-08 15:01:31 +0200621 return 0;
622}
Ingo Molnar0e9b20b2009-05-26 09:17:18 +0200623
Ingo Molnar0e9b20b2009-05-26 09:17:18 +0200624static const char * const record_usage[] = {
Mike Galbraith9e0967532009-05-28 16:25:34 +0200625 "perf record [<options>] [<command>]",
626 "perf record [<options>] -- <command> [<options>]",
Ingo Molnar0e9b20b2009-05-26 09:17:18 +0200627 NULL
628};
629
Ingo Molnar52425192009-05-26 09:17:18 +0200630static const struct option options[] = {
Ingo Molnar0e9b20b2009-05-26 09:17:18 +0200631 OPT_CALLBACK('e', "event", NULL, "event",
Thomas Gleixner86847b62009-06-06 12:24:17 +0200632 "event selector. use 'perf list' to list available events",
633 parse_events),
Ingo Molnar0e9b20b2009-05-26 09:17:18 +0200634 OPT_INTEGER('p', "pid", &target_pid,
635 "record events on existing pid"),
636 OPT_INTEGER('r', "realtime", &realtime_prio,
637 "collect data with this RT SCHED_FIFO priority"),
Frederic Weisbeckerdaac07b2009-08-13 10:27:19 +0200638 OPT_BOOLEAN('R', "raw-samples", &raw_samples,
639 "collect raw sample records from all opened counters"),
Ingo Molnar0e9b20b2009-05-26 09:17:18 +0200640 OPT_BOOLEAN('a', "all-cpus", &system_wide,
641 "system-wide collection from all CPUs"),
Ingo Molnarabaff322009-06-02 22:59:57 +0200642 OPT_BOOLEAN('A', "append", &append_file,
643 "append to the output file to do incremental profiling"),
Jens Axboe0a5ac842009-08-12 11:18:01 +0200644 OPT_INTEGER('C', "profile_cpu", &profile_cpu,
645 "CPU to profile on"),
Peter Zijlstra97124d52009-06-02 15:52:24 +0200646 OPT_BOOLEAN('f', "force", &force,
647 "overwrite existing data file"),
Peter Zijlstrae61078a2009-06-03 11:24:33 +0200648 OPT_LONG('c', "count", &default_interval,
Ingo Molnarabaff322009-06-02 22:59:57 +0200649 "event period to sample"),
650 OPT_STRING('o', "output", &output_name, "file",
651 "output file name"),
652 OPT_BOOLEAN('i', "inherit", &inherit,
653 "child tasks inherit counters"),
Ingo Molnarcf1f4572009-06-05 13:27:02 +0200654 OPT_INTEGER('F', "freq", &freq,
655 "profile at this frequency"),
Ingo Molnarabaff322009-06-02 22:59:57 +0200656 OPT_INTEGER('m', "mmap-pages", &mmap_pages,
657 "number of mmap data pages"),
Ingo Molnar3efa1cc92009-06-14 15:04:15 +0200658 OPT_BOOLEAN('g', "call-graph", &call_graph,
659 "do call-graph (stack chain/backtrace) recording"),
Ingo Molnar3da297a2009-06-07 17:39:02 +0200660 OPT_BOOLEAN('v', "verbose", &verbose,
661 "be more verbose (show counter open errors, etc)"),
Peter Zijlstra649c48a2009-06-24 21:12:48 +0200662 OPT_BOOLEAN('s', "stat", &inherit_stat,
663 "per thread counts"),
Anton Blanchard4bba8282009-07-16 15:44:29 +0200664 OPT_BOOLEAN('d', "data", &sample_address,
665 "Sample addresses"),
Peter Zijlstra649c48a2009-06-24 21:12:48 +0200666 OPT_BOOLEAN('n', "no-samples", &no_samples,
667 "don't sample"),
Ingo Molnar0e9b20b2009-05-26 09:17:18 +0200668 OPT_END()
669};
670
Ingo Molnarf37a2912009-07-01 12:37:06 +0200671int cmd_record(int argc, const char **argv, const char *prefix __used)
Ingo Molnar0e9b20b2009-05-26 09:17:18 +0200672{
673 int counter;
674
Anton Blancharda0541232009-07-22 23:04:12 +1000675 argc = parse_options(argc, argv, options, record_usage,
676 PARSE_OPT_STOP_AT_NON_OPTION);
Mike Galbraithef65b2a2009-05-27 10:10:51 +0200677 if (!argc && target_pid == -1 && !system_wide)
Ingo Molnar0e9b20b2009-05-26 09:17:18 +0200678 usage_with_options(record_usage, options);
679
Peter Zijlstrabbd36e52009-06-11 23:11:50 +0200680 if (!nr_counters) {
681 nr_counters = 1;
682 attrs[0].type = PERF_TYPE_HARDWARE;
683 attrs[0].config = PERF_COUNT_HW_CPU_CYCLES;
684 }
Ingo Molnar0e9b20b2009-05-26 09:17:18 +0200685
686 for (counter = 0; counter < nr_counters; counter++) {
Ingo Molnara21ca2c2009-06-06 09:58:57 +0200687 if (attrs[counter].sample_period)
Ingo Molnar0e9b20b2009-05-26 09:17:18 +0200688 continue;
689
Ingo Molnara21ca2c2009-06-06 09:58:57 +0200690 attrs[counter].sample_period = default_interval;
Ingo Molnar0e9b20b2009-05-26 09:17:18 +0200691 }
692
693 return __cmd_record(argc, argv);
694}