2 * Copyright (C) 2011, Red Hat Inc, Arnaldo Carvalho de Melo <acme@redhat.com>
4 * Parts came from builtin-{top,stat,record}.c, see those files for further
7 * Released under the GPL v2. (and only v2, not any later version)
10 #include <lk/debugfs.h>
13 #include "thread_map.h"
20 #include "parse-events.h"
24 #include <linux/bitops.h>
25 #include <linux/hash.h>
27 #define FD(e, x, y) (*(int *)xyarray__entry(e->fd, x, y))
28 #define SID(e, x, y) xyarray__entry(e->sample_id, x, y)
30 void perf_evlist__init(struct perf_evlist *evlist, struct cpu_map *cpus,
31 struct thread_map *threads)
35 for (i = 0; i < PERF_EVLIST__HLIST_SIZE; ++i)
36 INIT_HLIST_HEAD(&evlist->heads[i]);
37 INIT_LIST_HEAD(&evlist->entries);
38 perf_evlist__set_maps(evlist, cpus, threads);
39 evlist->workload.pid = -1;
42 struct perf_evlist *perf_evlist__new(void)
44 struct perf_evlist *evlist = zalloc(sizeof(*evlist));
47 perf_evlist__init(evlist, NULL, NULL);
53 * perf_evlist__set_id_pos - set the positions of event ids.
54 * @evlist: selected event list
56 * Events with compatible sample types all have the same id_pos
57 * and is_pos. For convenience, put a copy on evlist.
59 void perf_evlist__set_id_pos(struct perf_evlist *evlist)
61 struct perf_evsel *first = perf_evlist__first(evlist);
63 evlist->id_pos = first->id_pos;
64 evlist->is_pos = first->is_pos;
67 static void perf_evlist__update_id_pos(struct perf_evlist *evlist)
69 struct perf_evsel *evsel;
71 list_for_each_entry(evsel, &evlist->entries, node)
72 perf_evsel__calc_id_pos(evsel);
74 perf_evlist__set_id_pos(evlist);
77 static void perf_evlist__purge(struct perf_evlist *evlist)
79 struct perf_evsel *pos, *n;
81 list_for_each_entry_safe(pos, n, &evlist->entries, node) {
82 list_del_init(&pos->node);
83 perf_evsel__delete(pos);
86 evlist->nr_entries = 0;
89 void perf_evlist__exit(struct perf_evlist *evlist)
94 evlist->pollfd = NULL;
97 void perf_evlist__delete(struct perf_evlist *evlist)
99 perf_evlist__purge(evlist);
100 perf_evlist__exit(evlist);
104 void perf_evlist__add(struct perf_evlist *evlist, struct perf_evsel *entry)
106 list_add_tail(&entry->node, &evlist->entries);
107 if (!evlist->nr_entries++)
108 perf_evlist__set_id_pos(evlist);
111 void perf_evlist__splice_list_tail(struct perf_evlist *evlist,
112 struct list_head *list,
115 bool set_id_pos = !evlist->nr_entries;
117 list_splice_tail(list, &evlist->entries);
118 evlist->nr_entries += nr_entries;
120 perf_evlist__set_id_pos(evlist);
123 void __perf_evlist__set_leader(struct list_head *list)
125 struct perf_evsel *evsel, *leader;
127 leader = list_entry(list->next, struct perf_evsel, node);
128 evsel = list_entry(list->prev, struct perf_evsel, node);
130 leader->nr_members = evsel->idx - leader->idx + 1;
132 list_for_each_entry(evsel, list, node) {
133 evsel->leader = leader;
137 void perf_evlist__set_leader(struct perf_evlist *evlist)
139 if (evlist->nr_entries) {
140 evlist->nr_groups = evlist->nr_entries > 1 ? 1 : 0;
141 __perf_evlist__set_leader(&evlist->entries);
145 int perf_evlist__add_default(struct perf_evlist *evlist)
147 struct perf_event_attr attr = {
148 .type = PERF_TYPE_HARDWARE,
149 .config = PERF_COUNT_HW_CPU_CYCLES,
151 struct perf_evsel *evsel;
153 event_attr_init(&attr);
155 evsel = perf_evsel__new(&attr, 0);
159 /* use strdup() because free(evsel) assumes name is allocated */
160 evsel->name = strdup("cycles");
164 perf_evlist__add(evlist, evsel);
167 perf_evsel__delete(evsel);
172 static int perf_evlist__add_attrs(struct perf_evlist *evlist,
173 struct perf_event_attr *attrs, size_t nr_attrs)
175 struct perf_evsel *evsel, *n;
179 for (i = 0; i < nr_attrs; i++) {
180 evsel = perf_evsel__new(attrs + i, evlist->nr_entries + i);
182 goto out_delete_partial_list;
183 list_add_tail(&evsel->node, &head);
186 perf_evlist__splice_list_tail(evlist, &head, nr_attrs);
190 out_delete_partial_list:
191 list_for_each_entry_safe(evsel, n, &head, node)
192 perf_evsel__delete(evsel);
196 int __perf_evlist__add_default_attrs(struct perf_evlist *evlist,
197 struct perf_event_attr *attrs, size_t nr_attrs)
201 for (i = 0; i < nr_attrs; i++)
202 event_attr_init(attrs + i);
204 return perf_evlist__add_attrs(evlist, attrs, nr_attrs);
208 perf_evlist__find_tracepoint_by_id(struct perf_evlist *evlist, int id)
210 struct perf_evsel *evsel;
212 list_for_each_entry(evsel, &evlist->entries, node) {
213 if (evsel->attr.type == PERF_TYPE_TRACEPOINT &&
214 (int)evsel->attr.config == id)
222 perf_evlist__find_tracepoint_by_name(struct perf_evlist *evlist,
225 struct perf_evsel *evsel;
227 list_for_each_entry(evsel, &evlist->entries, node) {
228 if ((evsel->attr.type == PERF_TYPE_TRACEPOINT) &&
229 (strcmp(evsel->name, name) == 0))
236 int perf_evlist__add_newtp(struct perf_evlist *evlist,
237 const char *sys, const char *name, void *handler)
239 struct perf_evsel *evsel;
241 evsel = perf_evsel__newtp(sys, name, evlist->nr_entries);
245 evsel->handler.func = handler;
246 perf_evlist__add(evlist, evsel);
250 void perf_evlist__disable(struct perf_evlist *evlist)
253 struct perf_evsel *pos;
254 int nr_cpus = cpu_map__nr(evlist->cpus);
255 int nr_threads = thread_map__nr(evlist->threads);
257 for (cpu = 0; cpu < nr_cpus; cpu++) {
258 list_for_each_entry(pos, &evlist->entries, node) {
259 if (!perf_evsel__is_group_leader(pos) || !pos->fd)
261 for (thread = 0; thread < nr_threads; thread++)
262 ioctl(FD(pos, cpu, thread),
263 PERF_EVENT_IOC_DISABLE, 0);
268 void perf_evlist__enable(struct perf_evlist *evlist)
271 struct perf_evsel *pos;
272 int nr_cpus = cpu_map__nr(evlist->cpus);
273 int nr_threads = thread_map__nr(evlist->threads);
275 for (cpu = 0; cpu < nr_cpus; cpu++) {
276 list_for_each_entry(pos, &evlist->entries, node) {
277 if (!perf_evsel__is_group_leader(pos) || !pos->fd)
279 for (thread = 0; thread < nr_threads; thread++)
280 ioctl(FD(pos, cpu, thread),
281 PERF_EVENT_IOC_ENABLE, 0);
286 int perf_evlist__disable_event(struct perf_evlist *evlist,
287 struct perf_evsel *evsel)
289 int cpu, thread, err;
294 for (cpu = 0; cpu < evlist->cpus->nr; cpu++) {
295 for (thread = 0; thread < evlist->threads->nr; thread++) {
296 err = ioctl(FD(evsel, cpu, thread),
297 PERF_EVENT_IOC_DISABLE, 0);
305 int perf_evlist__enable_event(struct perf_evlist *evlist,
306 struct perf_evsel *evsel)
308 int cpu, thread, err;
313 for (cpu = 0; cpu < evlist->cpus->nr; cpu++) {
314 for (thread = 0; thread < evlist->threads->nr; thread++) {
315 err = ioctl(FD(evsel, cpu, thread),
316 PERF_EVENT_IOC_ENABLE, 0);
324 static int perf_evlist__alloc_pollfd(struct perf_evlist *evlist)
326 int nr_cpus = cpu_map__nr(evlist->cpus);
327 int nr_threads = thread_map__nr(evlist->threads);
328 int nfds = nr_cpus * nr_threads * evlist->nr_entries;
329 evlist->pollfd = malloc(sizeof(struct pollfd) * nfds);
330 return evlist->pollfd != NULL ? 0 : -ENOMEM;
333 void perf_evlist__add_pollfd(struct perf_evlist *evlist, int fd)
335 fcntl(fd, F_SETFL, O_NONBLOCK);
336 evlist->pollfd[evlist->nr_fds].fd = fd;
337 evlist->pollfd[evlist->nr_fds].events = POLLIN;
341 static void perf_evlist__id_hash(struct perf_evlist *evlist,
342 struct perf_evsel *evsel,
343 int cpu, int thread, u64 id)
346 struct perf_sample_id *sid = SID(evsel, cpu, thread);
350 hash = hash_64(sid->id, PERF_EVLIST__HLIST_BITS);
351 hlist_add_head(&sid->node, &evlist->heads[hash]);
354 void perf_evlist__id_add(struct perf_evlist *evlist, struct perf_evsel *evsel,
355 int cpu, int thread, u64 id)
357 perf_evlist__id_hash(evlist, evsel, cpu, thread, id);
358 evsel->id[evsel->ids++] = id;
361 static int perf_evlist__id_add_fd(struct perf_evlist *evlist,
362 struct perf_evsel *evsel,
363 int cpu, int thread, int fd)
365 u64 read_data[4] = { 0, };
366 int id_idx = 1; /* The first entry is the counter value */
370 ret = ioctl(fd, PERF_EVENT_IOC_ID, &id);
377 /* Legacy way to get event id.. All hail to old kernels! */
380 * This way does not work with group format read, so bail
383 if (perf_evlist__read_format(evlist) & PERF_FORMAT_GROUP)
386 if (!(evsel->attr.read_format & PERF_FORMAT_ID) ||
387 read(fd, &read_data, sizeof(read_data)) == -1)
390 if (evsel->attr.read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
392 if (evsel->attr.read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
395 id = read_data[id_idx];
398 perf_evlist__id_add(evlist, evsel, cpu, thread, id);
402 struct perf_sample_id *perf_evlist__id2sid(struct perf_evlist *evlist, u64 id)
404 struct hlist_head *head;
405 struct perf_sample_id *sid;
408 hash = hash_64(id, PERF_EVLIST__HLIST_BITS);
409 head = &evlist->heads[hash];
411 hlist_for_each_entry(sid, head, node)
418 struct perf_evsel *perf_evlist__id2evsel(struct perf_evlist *evlist, u64 id)
420 struct perf_sample_id *sid;
422 if (evlist->nr_entries == 1)
423 return perf_evlist__first(evlist);
425 sid = perf_evlist__id2sid(evlist, id);
429 if (!perf_evlist__sample_id_all(evlist))
430 return perf_evlist__first(evlist);
435 static int perf_evlist__event2id(struct perf_evlist *evlist,
436 union perf_event *event, u64 *id)
438 const u64 *array = event->sample.array;
441 n = (event->header.size - sizeof(event->header)) >> 3;
443 if (event->header.type == PERF_RECORD_SAMPLE) {
444 if (evlist->id_pos >= n)
446 *id = array[evlist->id_pos];
448 if (evlist->is_pos > n)
456 static struct perf_evsel *perf_evlist__event2evsel(struct perf_evlist *evlist,
457 union perf_event *event)
459 struct perf_evsel *first = perf_evlist__first(evlist);
460 struct hlist_head *head;
461 struct perf_sample_id *sid;
465 if (evlist->nr_entries == 1)
468 if (!first->attr.sample_id_all &&
469 event->header.type != PERF_RECORD_SAMPLE)
472 if (perf_evlist__event2id(evlist, event, &id))
475 /* Synthesized events have an id of zero */
479 hash = hash_64(id, PERF_EVLIST__HLIST_BITS);
480 head = &evlist->heads[hash];
482 hlist_for_each_entry(sid, head, node) {
489 union perf_event *perf_evlist__mmap_read(struct perf_evlist *evlist, int idx)
491 struct perf_mmap *md = &evlist->mmap[idx];
492 unsigned int head = perf_mmap__read_head(md);
493 unsigned int old = md->prev;
494 unsigned char *data = md->base + page_size;
495 union perf_event *event = NULL;
497 if (evlist->overwrite) {
499 * If we're further behind than half the buffer, there's a chance
500 * the writer will bite our tail and mess up the samples under us.
502 * If we somehow ended up ahead of the head, we got messed up.
504 * In either case, truncate and restart at head.
506 int diff = head - old;
507 if (diff > md->mask / 2 || diff < 0) {
508 fprintf(stderr, "WARNING: failed to keep up with mmap data.\n");
511 * head points to a known good entry, start there.
520 event = (union perf_event *)&data[old & md->mask];
521 size = event->header.size;
524 * Event straddles the mmap boundary -- header should always
525 * be inside due to u64 alignment of output.
527 if ((old & md->mask) + size != ((old + size) & md->mask)) {
528 unsigned int offset = old;
529 unsigned int len = min(sizeof(*event), size), cpy;
530 void *dst = &md->event_copy;
533 cpy = min(md->mask + 1 - (offset & md->mask), len);
534 memcpy(dst, &data[offset & md->mask], cpy);
540 event = &md->event_copy;
551 void perf_evlist__mmap_consume(struct perf_evlist *evlist, int idx)
553 if (!evlist->overwrite) {
554 struct perf_mmap *md = &evlist->mmap[idx];
555 unsigned int old = md->prev;
557 perf_mmap__write_tail(md, old);
561 static void __perf_evlist__munmap(struct perf_evlist *evlist, int idx)
563 if (evlist->mmap[idx].base != NULL) {
564 munmap(evlist->mmap[idx].base, evlist->mmap_len);
565 evlist->mmap[idx].base = NULL;
569 void perf_evlist__munmap(struct perf_evlist *evlist)
573 for (i = 0; i < evlist->nr_mmaps; i++)
574 __perf_evlist__munmap(evlist, i);
580 static int perf_evlist__alloc_mmap(struct perf_evlist *evlist)
582 evlist->nr_mmaps = cpu_map__nr(evlist->cpus);
583 if (cpu_map__empty(evlist->cpus))
584 evlist->nr_mmaps = thread_map__nr(evlist->threads);
585 evlist->mmap = zalloc(evlist->nr_mmaps * sizeof(struct perf_mmap));
586 return evlist->mmap != NULL ? 0 : -ENOMEM;
589 static int __perf_evlist__mmap(struct perf_evlist *evlist,
590 int idx, int prot, int mask, int fd)
592 evlist->mmap[idx].prev = 0;
593 evlist->mmap[idx].mask = mask;
594 evlist->mmap[idx].base = mmap(NULL, evlist->mmap_len, prot,
596 if (evlist->mmap[idx].base == MAP_FAILED) {
597 evlist->mmap[idx].base = NULL;
601 perf_evlist__add_pollfd(evlist, fd);
605 static int perf_evlist__mmap_per_cpu(struct perf_evlist *evlist, int prot, int mask)
607 struct perf_evsel *evsel;
609 int nr_cpus = cpu_map__nr(evlist->cpus);
610 int nr_threads = thread_map__nr(evlist->threads);
612 pr_debug2("perf event ring buffer mmapped per cpu\n");
613 for (cpu = 0; cpu < nr_cpus; cpu++) {
616 for (thread = 0; thread < nr_threads; thread++) {
617 list_for_each_entry(evsel, &evlist->entries, node) {
618 int fd = FD(evsel, cpu, thread);
622 if (__perf_evlist__mmap(evlist, cpu,
623 prot, mask, output) < 0)
626 if (ioctl(fd, PERF_EVENT_IOC_SET_OUTPUT, output) != 0)
630 if ((evsel->attr.read_format & PERF_FORMAT_ID) &&
631 perf_evlist__id_add_fd(evlist, evsel, cpu, thread, fd) < 0)
640 for (cpu = 0; cpu < nr_cpus; cpu++)
641 __perf_evlist__munmap(evlist, cpu);
645 static int perf_evlist__mmap_per_thread(struct perf_evlist *evlist, int prot, int mask)
647 struct perf_evsel *evsel;
649 int nr_threads = thread_map__nr(evlist->threads);
651 pr_debug2("perf event ring buffer mmapped per thread\n");
652 for (thread = 0; thread < nr_threads; thread++) {
655 list_for_each_entry(evsel, &evlist->entries, node) {
656 int fd = FD(evsel, 0, thread);
660 if (__perf_evlist__mmap(evlist, thread,
661 prot, mask, output) < 0)
664 if (ioctl(fd, PERF_EVENT_IOC_SET_OUTPUT, output) != 0)
668 if ((evsel->attr.read_format & PERF_FORMAT_ID) &&
669 perf_evlist__id_add_fd(evlist, evsel, 0, thread, fd) < 0)
677 for (thread = 0; thread < nr_threads; thread++)
678 __perf_evlist__munmap(evlist, thread);
682 /** perf_evlist__mmap - Create per cpu maps to receive events
684 * @evlist - list of events
685 * @pages - map length in pages
686 * @overwrite - overwrite older events?
688 * If overwrite is false the user needs to signal event consuption using:
690 * struct perf_mmap *m = &evlist->mmap[cpu];
691 * unsigned int head = perf_mmap__read_head(m);
693 * perf_mmap__write_tail(m, head)
695 * Using perf_evlist__read_on_cpu does this automatically.
697 int perf_evlist__mmap(struct perf_evlist *evlist, unsigned int pages,
700 struct perf_evsel *evsel;
701 const struct cpu_map *cpus = evlist->cpus;
702 const struct thread_map *threads = evlist->threads;
703 int prot = PROT_READ | (overwrite ? 0 : PROT_WRITE), mask;
705 /* 512 kiB: default amount of unprivileged mlocked memory */
706 if (pages == UINT_MAX)
707 pages = (512 * 1024) / page_size;
708 else if (!is_power_of_2(pages))
711 mask = pages * page_size - 1;
713 if (evlist->mmap == NULL && perf_evlist__alloc_mmap(evlist) < 0)
716 if (evlist->pollfd == NULL && perf_evlist__alloc_pollfd(evlist) < 0)
719 evlist->overwrite = overwrite;
720 evlist->mmap_len = (pages + 1) * page_size;
722 list_for_each_entry(evsel, &evlist->entries, node) {
723 if ((evsel->attr.read_format & PERF_FORMAT_ID) &&
724 evsel->sample_id == NULL &&
725 perf_evsel__alloc_id(evsel, cpu_map__nr(cpus), threads->nr) < 0)
729 if (cpu_map__empty(cpus))
730 return perf_evlist__mmap_per_thread(evlist, prot, mask);
732 return perf_evlist__mmap_per_cpu(evlist, prot, mask);
735 int perf_evlist__create_maps(struct perf_evlist *evlist,
736 struct perf_target *target)
738 evlist->threads = thread_map__new_str(target->pid, target->tid,
741 if (evlist->threads == NULL)
744 if (perf_target__has_task(target))
745 evlist->cpus = cpu_map__dummy_new();
746 else if (!perf_target__has_cpu(target) && !target->uses_mmap)
747 evlist->cpus = cpu_map__dummy_new();
749 evlist->cpus = cpu_map__new(target->cpu_list);
751 if (evlist->cpus == NULL)
752 goto out_delete_threads;
757 thread_map__delete(evlist->threads);
761 void perf_evlist__delete_maps(struct perf_evlist *evlist)
763 cpu_map__delete(evlist->cpus);
764 thread_map__delete(evlist->threads);
766 evlist->threads = NULL;
769 int perf_evlist__apply_filters(struct perf_evlist *evlist)
771 struct perf_evsel *evsel;
773 const int ncpus = cpu_map__nr(evlist->cpus),
774 nthreads = thread_map__nr(evlist->threads);
776 list_for_each_entry(evsel, &evlist->entries, node) {
777 if (evsel->filter == NULL)
780 err = perf_evsel__set_filter(evsel, ncpus, nthreads, evsel->filter);
788 int perf_evlist__set_filter(struct perf_evlist *evlist, const char *filter)
790 struct perf_evsel *evsel;
792 const int ncpus = cpu_map__nr(evlist->cpus),
793 nthreads = thread_map__nr(evlist->threads);
795 list_for_each_entry(evsel, &evlist->entries, node) {
796 err = perf_evsel__set_filter(evsel, ncpus, nthreads, filter);
804 bool perf_evlist__valid_sample_type(struct perf_evlist *evlist)
806 struct perf_evsel *pos;
808 if (evlist->nr_entries == 1)
811 if (evlist->id_pos < 0 || evlist->is_pos < 0)
814 list_for_each_entry(pos, &evlist->entries, node) {
815 if (pos->id_pos != evlist->id_pos ||
816 pos->is_pos != evlist->is_pos)
823 u64 __perf_evlist__combined_sample_type(struct perf_evlist *evlist)
825 struct perf_evsel *evsel;
827 if (evlist->combined_sample_type)
828 return evlist->combined_sample_type;
830 list_for_each_entry(evsel, &evlist->entries, node)
831 evlist->combined_sample_type |= evsel->attr.sample_type;
833 return evlist->combined_sample_type;
836 u64 perf_evlist__combined_sample_type(struct perf_evlist *evlist)
838 evlist->combined_sample_type = 0;
839 return __perf_evlist__combined_sample_type(evlist);
842 bool perf_evlist__valid_read_format(struct perf_evlist *evlist)
844 struct perf_evsel *first = perf_evlist__first(evlist), *pos = first;
845 u64 read_format = first->attr.read_format;
846 u64 sample_type = first->attr.sample_type;
848 list_for_each_entry_continue(pos, &evlist->entries, node) {
849 if (read_format != pos->attr.read_format)
853 /* PERF_SAMPLE_READ imples PERF_FORMAT_ID. */
854 if ((sample_type & PERF_SAMPLE_READ) &&
855 !(read_format & PERF_FORMAT_ID)) {
862 u64 perf_evlist__read_format(struct perf_evlist *evlist)
864 struct perf_evsel *first = perf_evlist__first(evlist);
865 return first->attr.read_format;
868 u16 perf_evlist__id_hdr_size(struct perf_evlist *evlist)
870 struct perf_evsel *first = perf_evlist__first(evlist);
871 struct perf_sample *data;
875 if (!first->attr.sample_id_all)
878 sample_type = first->attr.sample_type;
880 if (sample_type & PERF_SAMPLE_TID)
881 size += sizeof(data->tid) * 2;
883 if (sample_type & PERF_SAMPLE_TIME)
884 size += sizeof(data->time);
886 if (sample_type & PERF_SAMPLE_ID)
887 size += sizeof(data->id);
889 if (sample_type & PERF_SAMPLE_STREAM_ID)
890 size += sizeof(data->stream_id);
892 if (sample_type & PERF_SAMPLE_CPU)
893 size += sizeof(data->cpu) * 2;
895 if (sample_type & PERF_SAMPLE_IDENTIFIER)
896 size += sizeof(data->id);
901 bool perf_evlist__valid_sample_id_all(struct perf_evlist *evlist)
903 struct perf_evsel *first = perf_evlist__first(evlist), *pos = first;
905 list_for_each_entry_continue(pos, &evlist->entries, node) {
906 if (first->attr.sample_id_all != pos->attr.sample_id_all)
913 bool perf_evlist__sample_id_all(struct perf_evlist *evlist)
915 struct perf_evsel *first = perf_evlist__first(evlist);
916 return first->attr.sample_id_all;
919 void perf_evlist__set_selected(struct perf_evlist *evlist,
920 struct perf_evsel *evsel)
922 evlist->selected = evsel;
925 void perf_evlist__close(struct perf_evlist *evlist)
927 struct perf_evsel *evsel;
928 int ncpus = cpu_map__nr(evlist->cpus);
929 int nthreads = thread_map__nr(evlist->threads);
931 list_for_each_entry_reverse(evsel, &evlist->entries, node)
932 perf_evsel__close(evsel, ncpus, nthreads);
935 int perf_evlist__open(struct perf_evlist *evlist)
937 struct perf_evsel *evsel;
940 perf_evlist__update_id_pos(evlist);
942 list_for_each_entry(evsel, &evlist->entries, node) {
943 err = perf_evsel__open(evsel, evlist->cpus, evlist->threads);
950 perf_evlist__close(evlist);
955 int perf_evlist__prepare_workload(struct perf_evlist *evlist,
956 struct perf_target *target,
957 const char *argv[], bool pipe_output,
960 int child_ready_pipe[2], go_pipe[2];
963 if (pipe(child_ready_pipe) < 0) {
964 perror("failed to create 'ready' pipe");
968 if (pipe(go_pipe) < 0) {
969 perror("failed to create 'go' pipe");
970 goto out_close_ready_pipe;
973 evlist->workload.pid = fork();
974 if (evlist->workload.pid < 0) {
975 perror("failed to fork");
976 goto out_close_pipes;
979 if (!evlist->workload.pid) {
983 signal(SIGTERM, SIG_DFL);
985 close(child_ready_pipe[0]);
987 fcntl(go_pipe[0], F_SETFD, FD_CLOEXEC);
990 * Tell the parent we're ready to go
992 close(child_ready_pipe[1]);
995 * Wait until the parent tells us to go.
997 if (read(go_pipe[0], &bf, 1) == -1)
998 perror("unable to read pipe");
1000 execvp(argv[0], (char **)argv);
1004 kill(getppid(), SIGUSR1);
1008 if (perf_target__none(target))
1009 evlist->threads->map[0] = evlist->workload.pid;
1011 close(child_ready_pipe[1]);
1014 * wait for child to settle
1016 if (read(child_ready_pipe[0], &bf, 1) == -1) {
1017 perror("unable to read pipe");
1018 goto out_close_pipes;
1021 fcntl(go_pipe[1], F_SETFD, FD_CLOEXEC);
1022 evlist->workload.cork_fd = go_pipe[1];
1023 close(child_ready_pipe[0]);
1029 out_close_ready_pipe:
1030 close(child_ready_pipe[0]);
1031 close(child_ready_pipe[1]);
1035 int perf_evlist__start_workload(struct perf_evlist *evlist)
1037 if (evlist->workload.cork_fd > 0) {
1041 * Remove the cork, let it rip!
1043 ret = write(evlist->workload.cork_fd, &bf, 1);
1045 perror("enable to write to pipe");
1047 close(evlist->workload.cork_fd);
1054 int perf_evlist__parse_sample(struct perf_evlist *evlist, union perf_event *event,
1055 struct perf_sample *sample)
1057 struct perf_evsel *evsel = perf_evlist__event2evsel(evlist, event);
1061 return perf_evsel__parse_sample(evsel, event, sample);
1064 size_t perf_evlist__fprintf(struct perf_evlist *evlist, FILE *fp)
1066 struct perf_evsel *evsel;
1069 list_for_each_entry(evsel, &evlist->entries, node) {
1070 printed += fprintf(fp, "%s%s", evsel->idx ? ", " : "",
1071 perf_evsel__name(evsel));
1074 return printed + fprintf(fp, "\n");;