Commit | Line | Data |
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f8a95309 ACM |
1 | /* |
2 | * Copyright (C) 2011, Red Hat Inc, Arnaldo Carvalho de Melo <acme@redhat.com> | |
3 | * | |
4 | * Parts came from builtin-{top,stat,record}.c, see those files for further | |
5 | * copyright notes. | |
6 | * | |
7 | * Released under the GPL v2. (and only v2, not any later version) | |
8 | */ | |
5c581041 | 9 | #include <poll.h> |
f8a95309 ACM |
10 | #include "cpumap.h" |
11 | #include "thread_map.h" | |
361c99a6 ACM |
12 | #include "evlist.h" |
13 | #include "evsel.h" | |
14 | #include "util.h" | |
15 | ||
f8a95309 ACM |
16 | #include <sys/mman.h> |
17 | ||
70db7533 ACM |
18 | #include <linux/bitops.h> |
19 | #include <linux/hash.h> | |
20 | ||
f8a95309 | 21 | #define FD(e, x, y) (*(int *)xyarray__entry(e->fd, x, y)) |
a91e5431 | 22 | #define SID(e, x, y) xyarray__entry(e->sample_id, x, y) |
f8a95309 | 23 | |
7e2ed097 ACM |
24 | void perf_evlist__init(struct perf_evlist *evlist, struct cpu_map *cpus, |
25 | struct thread_map *threads) | |
ef1d1af2 ACM |
26 | { |
27 | int i; | |
28 | ||
29 | for (i = 0; i < PERF_EVLIST__HLIST_SIZE; ++i) | |
30 | INIT_HLIST_HEAD(&evlist->heads[i]); | |
31 | INIT_LIST_HEAD(&evlist->entries); | |
7e2ed097 | 32 | perf_evlist__set_maps(evlist, cpus, threads); |
ef1d1af2 ACM |
33 | } |
34 | ||
7e2ed097 ACM |
35 | struct perf_evlist *perf_evlist__new(struct cpu_map *cpus, |
36 | struct thread_map *threads) | |
361c99a6 ACM |
37 | { |
38 | struct perf_evlist *evlist = zalloc(sizeof(*evlist)); | |
39 | ||
ef1d1af2 | 40 | if (evlist != NULL) |
7e2ed097 | 41 | perf_evlist__init(evlist, cpus, threads); |
361c99a6 ACM |
42 | |
43 | return evlist; | |
44 | } | |
45 | ||
46 | static void perf_evlist__purge(struct perf_evlist *evlist) | |
47 | { | |
48 | struct perf_evsel *pos, *n; | |
49 | ||
50 | list_for_each_entry_safe(pos, n, &evlist->entries, node) { | |
51 | list_del_init(&pos->node); | |
52 | perf_evsel__delete(pos); | |
53 | } | |
54 | ||
55 | evlist->nr_entries = 0; | |
56 | } | |
57 | ||
ef1d1af2 | 58 | void perf_evlist__exit(struct perf_evlist *evlist) |
361c99a6 | 59 | { |
70db7533 | 60 | free(evlist->mmap); |
5c581041 | 61 | free(evlist->pollfd); |
ef1d1af2 ACM |
62 | evlist->mmap = NULL; |
63 | evlist->pollfd = NULL; | |
64 | } | |
65 | ||
66 | void perf_evlist__delete(struct perf_evlist *evlist) | |
67 | { | |
68 | perf_evlist__purge(evlist); | |
69 | perf_evlist__exit(evlist); | |
361c99a6 ACM |
70 | free(evlist); |
71 | } | |
72 | ||
73 | void perf_evlist__add(struct perf_evlist *evlist, struct perf_evsel *entry) | |
74 | { | |
75 | list_add_tail(&entry->node, &evlist->entries); | |
76 | ++evlist->nr_entries; | |
77 | } | |
78 | ||
79 | int perf_evlist__add_default(struct perf_evlist *evlist) | |
80 | { | |
81 | struct perf_event_attr attr = { | |
82 | .type = PERF_TYPE_HARDWARE, | |
83 | .config = PERF_COUNT_HW_CPU_CYCLES, | |
84 | }; | |
85 | struct perf_evsel *evsel = perf_evsel__new(&attr, 0); | |
86 | ||
87 | if (evsel == NULL) | |
cc2d86b0 SE |
88 | goto error; |
89 | ||
90 | /* use strdup() because free(evsel) assumes name is allocated */ | |
91 | evsel->name = strdup("cycles"); | |
92 | if (!evsel->name) | |
93 | goto error_free; | |
361c99a6 ACM |
94 | |
95 | perf_evlist__add(evlist, evsel); | |
96 | return 0; | |
cc2d86b0 SE |
97 | error_free: |
98 | perf_evsel__delete(evsel); | |
99 | error: | |
100 | return -ENOMEM; | |
361c99a6 | 101 | } |
5c581041 | 102 | |
4152ab37 ACM |
103 | void perf_evlist__disable(struct perf_evlist *evlist) |
104 | { | |
105 | int cpu, thread; | |
106 | struct perf_evsel *pos; | |
107 | ||
108 | for (cpu = 0; cpu < evlist->cpus->nr; cpu++) { | |
109 | list_for_each_entry(pos, &evlist->entries, node) { | |
110 | for (thread = 0; thread < evlist->threads->nr; thread++) | |
111 | ioctl(FD(pos, cpu, thread), PERF_EVENT_IOC_DISABLE); | |
112 | } | |
113 | } | |
114 | } | |
115 | ||
764e16a3 DA |
116 | void perf_evlist__enable(struct perf_evlist *evlist) |
117 | { | |
118 | int cpu, thread; | |
119 | struct perf_evsel *pos; | |
120 | ||
121 | for (cpu = 0; cpu < evlist->cpus->nr; cpu++) { | |
122 | list_for_each_entry(pos, &evlist->entries, node) { | |
123 | for (thread = 0; thread < evlist->threads->nr; thread++) | |
124 | ioctl(FD(pos, cpu, thread), PERF_EVENT_IOC_ENABLE); | |
125 | } | |
126 | } | |
127 | } | |
128 | ||
7e2ed097 | 129 | int perf_evlist__alloc_pollfd(struct perf_evlist *evlist) |
5c581041 | 130 | { |
7e2ed097 | 131 | int nfds = evlist->cpus->nr * evlist->threads->nr * evlist->nr_entries; |
5c581041 ACM |
132 | evlist->pollfd = malloc(sizeof(struct pollfd) * nfds); |
133 | return evlist->pollfd != NULL ? 0 : -ENOMEM; | |
134 | } | |
70082dd9 ACM |
135 | |
136 | void perf_evlist__add_pollfd(struct perf_evlist *evlist, int fd) | |
137 | { | |
138 | fcntl(fd, F_SETFL, O_NONBLOCK); | |
139 | evlist->pollfd[evlist->nr_fds].fd = fd; | |
140 | evlist->pollfd[evlist->nr_fds].events = POLLIN; | |
141 | evlist->nr_fds++; | |
142 | } | |
70db7533 | 143 | |
a91e5431 ACM |
144 | static void perf_evlist__id_hash(struct perf_evlist *evlist, |
145 | struct perf_evsel *evsel, | |
146 | int cpu, int thread, u64 id) | |
3d3b5e95 ACM |
147 | { |
148 | int hash; | |
149 | struct perf_sample_id *sid = SID(evsel, cpu, thread); | |
150 | ||
151 | sid->id = id; | |
152 | sid->evsel = evsel; | |
153 | hash = hash_64(sid->id, PERF_EVLIST__HLIST_BITS); | |
154 | hlist_add_head(&sid->node, &evlist->heads[hash]); | |
155 | } | |
156 | ||
a91e5431 ACM |
157 | void perf_evlist__id_add(struct perf_evlist *evlist, struct perf_evsel *evsel, |
158 | int cpu, int thread, u64 id) | |
159 | { | |
160 | perf_evlist__id_hash(evlist, evsel, cpu, thread, id); | |
161 | evsel->id[evsel->ids++] = id; | |
162 | } | |
163 | ||
164 | static int perf_evlist__id_add_fd(struct perf_evlist *evlist, | |
165 | struct perf_evsel *evsel, | |
166 | int cpu, int thread, int fd) | |
f8a95309 | 167 | { |
f8a95309 | 168 | u64 read_data[4] = { 0, }; |
3d3b5e95 | 169 | int id_idx = 1; /* The first entry is the counter value */ |
f8a95309 ACM |
170 | |
171 | if (!(evsel->attr.read_format & PERF_FORMAT_ID) || | |
172 | read(fd, &read_data, sizeof(read_data)) == -1) | |
173 | return -1; | |
174 | ||
175 | if (evsel->attr.read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) | |
176 | ++id_idx; | |
177 | if (evsel->attr.read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) | |
178 | ++id_idx; | |
179 | ||
a91e5431 | 180 | perf_evlist__id_add(evlist, evsel, cpu, thread, read_data[id_idx]); |
f8a95309 ACM |
181 | return 0; |
182 | } | |
183 | ||
70db7533 ACM |
184 | struct perf_evsel *perf_evlist__id2evsel(struct perf_evlist *evlist, u64 id) |
185 | { | |
186 | struct hlist_head *head; | |
187 | struct hlist_node *pos; | |
188 | struct perf_sample_id *sid; | |
189 | int hash; | |
190 | ||
191 | if (evlist->nr_entries == 1) | |
192 | return list_entry(evlist->entries.next, struct perf_evsel, node); | |
193 | ||
194 | hash = hash_64(id, PERF_EVLIST__HLIST_BITS); | |
195 | head = &evlist->heads[hash]; | |
196 | ||
197 | hlist_for_each_entry(sid, pos, head, node) | |
198 | if (sid->id == id) | |
199 | return sid->evsel; | |
200 | return NULL; | |
201 | } | |
04391deb | 202 | |
aece948f | 203 | union perf_event *perf_evlist__mmap_read(struct perf_evlist *evlist, int idx) |
04391deb ACM |
204 | { |
205 | /* XXX Move this to perf.c, making it generally available */ | |
206 | unsigned int page_size = sysconf(_SC_PAGE_SIZE); | |
aece948f | 207 | struct perf_mmap *md = &evlist->mmap[idx]; |
04391deb ACM |
208 | unsigned int head = perf_mmap__read_head(md); |
209 | unsigned int old = md->prev; | |
210 | unsigned char *data = md->base + page_size; | |
8115d60c | 211 | union perf_event *event = NULL; |
04391deb | 212 | |
7bb41152 | 213 | if (evlist->overwrite) { |
04391deb | 214 | /* |
7bb41152 ACM |
215 | * If we're further behind than half the buffer, there's a chance |
216 | * the writer will bite our tail and mess up the samples under us. | |
217 | * | |
218 | * If we somehow ended up ahead of the head, we got messed up. | |
219 | * | |
220 | * In either case, truncate and restart at head. | |
04391deb | 221 | */ |
7bb41152 ACM |
222 | int diff = head - old; |
223 | if (diff > md->mask / 2 || diff < 0) { | |
224 | fprintf(stderr, "WARNING: failed to keep up with mmap data.\n"); | |
225 | ||
226 | /* | |
227 | * head points to a known good entry, start there. | |
228 | */ | |
229 | old = head; | |
230 | } | |
04391deb ACM |
231 | } |
232 | ||
233 | if (old != head) { | |
234 | size_t size; | |
235 | ||
8115d60c | 236 | event = (union perf_event *)&data[old & md->mask]; |
04391deb ACM |
237 | size = event->header.size; |
238 | ||
239 | /* | |
240 | * Event straddles the mmap boundary -- header should always | |
241 | * be inside due to u64 alignment of output. | |
242 | */ | |
243 | if ((old & md->mask) + size != ((old + size) & md->mask)) { | |
244 | unsigned int offset = old; | |
245 | unsigned int len = min(sizeof(*event), size), cpy; | |
246 | void *dst = &evlist->event_copy; | |
247 | ||
248 | do { | |
249 | cpy = min(md->mask + 1 - (offset & md->mask), len); | |
250 | memcpy(dst, &data[offset & md->mask], cpy); | |
251 | offset += cpy; | |
252 | dst += cpy; | |
253 | len -= cpy; | |
254 | } while (len); | |
255 | ||
256 | event = &evlist->event_copy; | |
257 | } | |
258 | ||
259 | old += size; | |
260 | } | |
261 | ||
262 | md->prev = old; | |
7bb41152 ACM |
263 | |
264 | if (!evlist->overwrite) | |
265 | perf_mmap__write_tail(md, old); | |
266 | ||
04391deb ACM |
267 | return event; |
268 | } | |
f8a95309 | 269 | |
7e2ed097 | 270 | void perf_evlist__munmap(struct perf_evlist *evlist) |
f8a95309 | 271 | { |
aece948f | 272 | int i; |
f8a95309 | 273 | |
aece948f ACM |
274 | for (i = 0; i < evlist->nr_mmaps; i++) { |
275 | if (evlist->mmap[i].base != NULL) { | |
276 | munmap(evlist->mmap[i].base, evlist->mmap_len); | |
277 | evlist->mmap[i].base = NULL; | |
f8a95309 ACM |
278 | } |
279 | } | |
aece948f ACM |
280 | |
281 | free(evlist->mmap); | |
282 | evlist->mmap = NULL; | |
f8a95309 ACM |
283 | } |
284 | ||
7e2ed097 | 285 | int perf_evlist__alloc_mmap(struct perf_evlist *evlist) |
f8a95309 | 286 | { |
aece948f ACM |
287 | evlist->nr_mmaps = evlist->cpus->nr; |
288 | if (evlist->cpus->map[0] == -1) | |
289 | evlist->nr_mmaps = evlist->threads->nr; | |
290 | evlist->mmap = zalloc(evlist->nr_mmaps * sizeof(struct perf_mmap)); | |
f8a95309 ACM |
291 | return evlist->mmap != NULL ? 0 : -ENOMEM; |
292 | } | |
293 | ||
bccdaba0 | 294 | static int __perf_evlist__mmap(struct perf_evlist *evlist, |
aece948f | 295 | int idx, int prot, int mask, int fd) |
f8a95309 | 296 | { |
aece948f ACM |
297 | evlist->mmap[idx].prev = 0; |
298 | evlist->mmap[idx].mask = mask; | |
299 | evlist->mmap[idx].base = mmap(NULL, evlist->mmap_len, prot, | |
f8a95309 | 300 | MAP_SHARED, fd, 0); |
bccdaba0 | 301 | if (evlist->mmap[idx].base == MAP_FAILED) |
f8a95309 ACM |
302 | return -1; |
303 | ||
304 | perf_evlist__add_pollfd(evlist, fd); | |
305 | return 0; | |
306 | } | |
307 | ||
aece948f ACM |
308 | static int perf_evlist__mmap_per_cpu(struct perf_evlist *evlist, int prot, int mask) |
309 | { | |
310 | struct perf_evsel *evsel; | |
311 | int cpu, thread; | |
312 | ||
313 | for (cpu = 0; cpu < evlist->cpus->nr; cpu++) { | |
314 | int output = -1; | |
315 | ||
316 | for (thread = 0; thread < evlist->threads->nr; thread++) { | |
317 | list_for_each_entry(evsel, &evlist->entries, node) { | |
318 | int fd = FD(evsel, cpu, thread); | |
319 | ||
320 | if (output == -1) { | |
321 | output = fd; | |
bccdaba0 | 322 | if (__perf_evlist__mmap(evlist, cpu, |
aece948f ACM |
323 | prot, mask, output) < 0) |
324 | goto out_unmap; | |
325 | } else { | |
326 | if (ioctl(fd, PERF_EVENT_IOC_SET_OUTPUT, output) != 0) | |
327 | goto out_unmap; | |
328 | } | |
329 | ||
330 | if ((evsel->attr.read_format & PERF_FORMAT_ID) && | |
331 | perf_evlist__id_add_fd(evlist, evsel, cpu, thread, fd) < 0) | |
332 | goto out_unmap; | |
333 | } | |
334 | } | |
335 | } | |
336 | ||
337 | return 0; | |
338 | ||
339 | out_unmap: | |
340 | for (cpu = 0; cpu < evlist->cpus->nr; cpu++) { | |
341 | if (evlist->mmap[cpu].base != NULL) { | |
342 | munmap(evlist->mmap[cpu].base, evlist->mmap_len); | |
343 | evlist->mmap[cpu].base = NULL; | |
344 | } | |
345 | } | |
346 | return -1; | |
347 | } | |
348 | ||
349 | static int perf_evlist__mmap_per_thread(struct perf_evlist *evlist, int prot, int mask) | |
350 | { | |
351 | struct perf_evsel *evsel; | |
352 | int thread; | |
353 | ||
354 | for (thread = 0; thread < evlist->threads->nr; thread++) { | |
355 | int output = -1; | |
356 | ||
357 | list_for_each_entry(evsel, &evlist->entries, node) { | |
358 | int fd = FD(evsel, 0, thread); | |
359 | ||
360 | if (output == -1) { | |
361 | output = fd; | |
bccdaba0 | 362 | if (__perf_evlist__mmap(evlist, thread, |
aece948f ACM |
363 | prot, mask, output) < 0) |
364 | goto out_unmap; | |
365 | } else { | |
366 | if (ioctl(fd, PERF_EVENT_IOC_SET_OUTPUT, output) != 0) | |
367 | goto out_unmap; | |
368 | } | |
369 | ||
370 | if ((evsel->attr.read_format & PERF_FORMAT_ID) && | |
371 | perf_evlist__id_add_fd(evlist, evsel, 0, thread, fd) < 0) | |
372 | goto out_unmap; | |
373 | } | |
374 | } | |
375 | ||
376 | return 0; | |
377 | ||
378 | out_unmap: | |
379 | for (thread = 0; thread < evlist->threads->nr; thread++) { | |
380 | if (evlist->mmap[thread].base != NULL) { | |
381 | munmap(evlist->mmap[thread].base, evlist->mmap_len); | |
382 | evlist->mmap[thread].base = NULL; | |
383 | } | |
384 | } | |
385 | return -1; | |
386 | } | |
387 | ||
f8a95309 ACM |
388 | /** perf_evlist__mmap - Create per cpu maps to receive events |
389 | * | |
390 | * @evlist - list of events | |
f8a95309 ACM |
391 | * @pages - map length in pages |
392 | * @overwrite - overwrite older events? | |
393 | * | |
394 | * If overwrite is false the user needs to signal event consuption using: | |
395 | * | |
396 | * struct perf_mmap *m = &evlist->mmap[cpu]; | |
397 | * unsigned int head = perf_mmap__read_head(m); | |
398 | * | |
399 | * perf_mmap__write_tail(m, head) | |
7e2ed097 ACM |
400 | * |
401 | * Using perf_evlist__read_on_cpu does this automatically. | |
f8a95309 | 402 | */ |
7e2ed097 | 403 | int perf_evlist__mmap(struct perf_evlist *evlist, int pages, bool overwrite) |
f8a95309 ACM |
404 | { |
405 | unsigned int page_size = sysconf(_SC_PAGE_SIZE); | |
aece948f ACM |
406 | int mask = pages * page_size - 1; |
407 | struct perf_evsel *evsel; | |
7e2ed097 ACM |
408 | const struct cpu_map *cpus = evlist->cpus; |
409 | const struct thread_map *threads = evlist->threads; | |
aece948f | 410 | int prot = PROT_READ | (overwrite ? 0 : PROT_WRITE); |
f8a95309 | 411 | |
7e2ed097 | 412 | if (evlist->mmap == NULL && perf_evlist__alloc_mmap(evlist) < 0) |
f8a95309 ACM |
413 | return -ENOMEM; |
414 | ||
7e2ed097 | 415 | if (evlist->pollfd == NULL && perf_evlist__alloc_pollfd(evlist) < 0) |
f8a95309 ACM |
416 | return -ENOMEM; |
417 | ||
418 | evlist->overwrite = overwrite; | |
419 | evlist->mmap_len = (pages + 1) * page_size; | |
f8a95309 ACM |
420 | |
421 | list_for_each_entry(evsel, &evlist->entries, node) { | |
422 | if ((evsel->attr.read_format & PERF_FORMAT_ID) && | |
a91e5431 | 423 | evsel->sample_id == NULL && |
f8a95309 ACM |
424 | perf_evsel__alloc_id(evsel, cpus->nr, threads->nr) < 0) |
425 | return -ENOMEM; | |
f8a95309 ACM |
426 | } |
427 | ||
aece948f ACM |
428 | if (evlist->cpus->map[0] == -1) |
429 | return perf_evlist__mmap_per_thread(evlist, prot, mask); | |
f8a95309 | 430 | |
aece948f | 431 | return perf_evlist__mmap_per_cpu(evlist, prot, mask); |
f8a95309 | 432 | } |
7e2ed097 ACM |
433 | |
434 | int perf_evlist__create_maps(struct perf_evlist *evlist, pid_t target_pid, | |
435 | pid_t target_tid, const char *cpu_list) | |
436 | { | |
437 | evlist->threads = thread_map__new(target_pid, target_tid); | |
438 | ||
439 | if (evlist->threads == NULL) | |
440 | return -1; | |
441 | ||
b9019418 | 442 | if (cpu_list == NULL && target_tid != -1) |
7e2ed097 ACM |
443 | evlist->cpus = cpu_map__dummy_new(); |
444 | else | |
445 | evlist->cpus = cpu_map__new(cpu_list); | |
446 | ||
447 | if (evlist->cpus == NULL) | |
448 | goto out_delete_threads; | |
449 | ||
450 | return 0; | |
451 | ||
452 | out_delete_threads: | |
453 | thread_map__delete(evlist->threads); | |
454 | return -1; | |
455 | } | |
456 | ||
457 | void perf_evlist__delete_maps(struct perf_evlist *evlist) | |
458 | { | |
459 | cpu_map__delete(evlist->cpus); | |
460 | thread_map__delete(evlist->threads); | |
461 | evlist->cpus = NULL; | |
462 | evlist->threads = NULL; | |
463 | } | |
0a102479 FW |
464 | |
465 | int perf_evlist__set_filters(struct perf_evlist *evlist) | |
466 | { | |
467 | const struct thread_map *threads = evlist->threads; | |
468 | const struct cpu_map *cpus = evlist->cpus; | |
469 | struct perf_evsel *evsel; | |
470 | char *filter; | |
471 | int thread; | |
472 | int cpu; | |
473 | int err; | |
474 | int fd; | |
475 | ||
476 | list_for_each_entry(evsel, &evlist->entries, node) { | |
477 | filter = evsel->filter; | |
478 | if (!filter) | |
479 | continue; | |
480 | for (cpu = 0; cpu < cpus->nr; cpu++) { | |
481 | for (thread = 0; thread < threads->nr; thread++) { | |
482 | fd = FD(evsel, cpu, thread); | |
483 | err = ioctl(fd, PERF_EVENT_IOC_SET_FILTER, filter); | |
484 | if (err) | |
485 | return err; | |
486 | } | |
487 | } | |
488 | } | |
489 | ||
490 | return 0; | |
491 | } | |
74429964 | 492 | |
c2a70653 | 493 | bool perf_evlist__valid_sample_type(const struct perf_evlist *evlist) |
74429964 | 494 | { |
c2a70653 ACM |
495 | struct perf_evsel *pos, *first; |
496 | ||
497 | pos = first = list_entry(evlist->entries.next, struct perf_evsel, node); | |
498 | ||
499 | list_for_each_entry_continue(pos, &evlist->entries, node) { | |
500 | if (first->attr.sample_type != pos->attr.sample_type) | |
501 | return false; | |
74429964 FW |
502 | } |
503 | ||
c2a70653 | 504 | return true; |
74429964 FW |
505 | } |
506 | ||
c2a70653 ACM |
507 | u64 perf_evlist__sample_type(const struct perf_evlist *evlist) |
508 | { | |
509 | struct perf_evsel *first; | |
510 | ||
511 | first = list_entry(evlist->entries.next, struct perf_evsel, node); | |
512 | return first->attr.sample_type; | |
513 | } | |
514 | ||
515 | bool perf_evlist__valid_sample_id_all(const struct perf_evlist *evlist) | |
74429964 | 516 | { |
c2a70653 ACM |
517 | struct perf_evsel *pos, *first; |
518 | ||
519 | pos = first = list_entry(evlist->entries.next, struct perf_evsel, node); | |
520 | ||
521 | list_for_each_entry_continue(pos, &evlist->entries, node) { | |
522 | if (first->attr.sample_id_all != pos->attr.sample_id_all) | |
523 | return false; | |
74429964 FW |
524 | } |
525 | ||
c2a70653 ACM |
526 | return true; |
527 | } | |
528 | ||
529 | bool perf_evlist__sample_id_all(const struct perf_evlist *evlist) | |
530 | { | |
531 | struct perf_evsel *first; | |
532 | ||
533 | first = list_entry(evlist->entries.next, struct perf_evsel, node); | |
534 | return first->attr.sample_id_all; | |
74429964 | 535 | } |
81cce8de ACM |
536 | |
537 | void perf_evlist__set_selected(struct perf_evlist *evlist, | |
538 | struct perf_evsel *evsel) | |
539 | { | |
540 | evlist->selected = evsel; | |
541 | } |