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"
21 #include "parse-options.h"
25 #include <linux/bitops.h>
26 #include <linux/hash.h>
28 #define FD(e, x, y) (*(int *)xyarray__entry(e->fd, x, y))
29 #define SID(e, x, y) xyarray__entry(e->sample_id, x, y)
31 void perf_evlist__init(struct perf_evlist *evlist, struct cpu_map *cpus,
32 struct thread_map *threads)
36 for (i = 0; i < PERF_EVLIST__HLIST_SIZE; ++i)
37 INIT_HLIST_HEAD(&evlist->heads[i]);
38 INIT_LIST_HEAD(&evlist->entries);
39 perf_evlist__set_maps(evlist, cpus, threads);
40 evlist->workload.pid = -1;
43 struct perf_evlist *perf_evlist__new(void)
45 struct perf_evlist *evlist = zalloc(sizeof(*evlist));
48 perf_evlist__init(evlist, NULL, NULL);
53 struct perf_evlist *perf_evlist__new_default(void)
55 struct perf_evlist *evlist = perf_evlist__new();
57 if (evlist && perf_evlist__add_default(evlist)) {
58 perf_evlist__delete(evlist);
66 * perf_evlist__set_id_pos - set the positions of event ids.
67 * @evlist: selected event list
69 * Events with compatible sample types all have the same id_pos
70 * and is_pos. For convenience, put a copy on evlist.
72 void perf_evlist__set_id_pos(struct perf_evlist *evlist)
74 struct perf_evsel *first = perf_evlist__first(evlist);
76 evlist->id_pos = first->id_pos;
77 evlist->is_pos = first->is_pos;
80 static void perf_evlist__update_id_pos(struct perf_evlist *evlist)
82 struct perf_evsel *evsel;
84 list_for_each_entry(evsel, &evlist->entries, node)
85 perf_evsel__calc_id_pos(evsel);
87 perf_evlist__set_id_pos(evlist);
90 static void perf_evlist__purge(struct perf_evlist *evlist)
92 struct perf_evsel *pos, *n;
94 list_for_each_entry_safe(pos, n, &evlist->entries, node) {
95 list_del_init(&pos->node);
96 perf_evsel__delete(pos);
99 evlist->nr_entries = 0;
102 void perf_evlist__exit(struct perf_evlist *evlist)
105 free(evlist->pollfd);
107 evlist->pollfd = NULL;
110 void perf_evlist__delete(struct perf_evlist *evlist)
112 perf_evlist__purge(evlist);
113 perf_evlist__exit(evlist);
117 void perf_evlist__add(struct perf_evlist *evlist, struct perf_evsel *entry)
119 list_add_tail(&entry->node, &evlist->entries);
120 if (!evlist->nr_entries++)
121 perf_evlist__set_id_pos(evlist);
124 void perf_evlist__splice_list_tail(struct perf_evlist *evlist,
125 struct list_head *list,
128 bool set_id_pos = !evlist->nr_entries;
130 list_splice_tail(list, &evlist->entries);
131 evlist->nr_entries += nr_entries;
133 perf_evlist__set_id_pos(evlist);
136 void __perf_evlist__set_leader(struct list_head *list)
138 struct perf_evsel *evsel, *leader;
140 leader = list_entry(list->next, struct perf_evsel, node);
141 evsel = list_entry(list->prev, struct perf_evsel, node);
143 leader->nr_members = evsel->idx - leader->idx + 1;
145 list_for_each_entry(evsel, list, node) {
146 evsel->leader = leader;
150 void perf_evlist__set_leader(struct perf_evlist *evlist)
152 if (evlist->nr_entries) {
153 evlist->nr_groups = evlist->nr_entries > 1 ? 1 : 0;
154 __perf_evlist__set_leader(&evlist->entries);
158 int perf_evlist__add_default(struct perf_evlist *evlist)
160 struct perf_event_attr attr = {
161 .type = PERF_TYPE_HARDWARE,
162 .config = PERF_COUNT_HW_CPU_CYCLES,
164 struct perf_evsel *evsel;
166 event_attr_init(&attr);
168 evsel = perf_evsel__new(&attr, 0);
172 /* use strdup() because free(evsel) assumes name is allocated */
173 evsel->name = strdup("cycles");
177 perf_evlist__add(evlist, evsel);
180 perf_evsel__delete(evsel);
185 static int perf_evlist__add_attrs(struct perf_evlist *evlist,
186 struct perf_event_attr *attrs, size_t nr_attrs)
188 struct perf_evsel *evsel, *n;
192 for (i = 0; i < nr_attrs; i++) {
193 evsel = perf_evsel__new(attrs + i, evlist->nr_entries + i);
195 goto out_delete_partial_list;
196 list_add_tail(&evsel->node, &head);
199 perf_evlist__splice_list_tail(evlist, &head, nr_attrs);
203 out_delete_partial_list:
204 list_for_each_entry_safe(evsel, n, &head, node)
205 perf_evsel__delete(evsel);
209 int __perf_evlist__add_default_attrs(struct perf_evlist *evlist,
210 struct perf_event_attr *attrs, size_t nr_attrs)
214 for (i = 0; i < nr_attrs; i++)
215 event_attr_init(attrs + i);
217 return perf_evlist__add_attrs(evlist, attrs, nr_attrs);
221 perf_evlist__find_tracepoint_by_id(struct perf_evlist *evlist, int id)
223 struct perf_evsel *evsel;
225 list_for_each_entry(evsel, &evlist->entries, node) {
226 if (evsel->attr.type == PERF_TYPE_TRACEPOINT &&
227 (int)evsel->attr.config == id)
235 perf_evlist__find_tracepoint_by_name(struct perf_evlist *evlist,
238 struct perf_evsel *evsel;
240 list_for_each_entry(evsel, &evlist->entries, node) {
241 if ((evsel->attr.type == PERF_TYPE_TRACEPOINT) &&
242 (strcmp(evsel->name, name) == 0))
249 int perf_evlist__add_newtp(struct perf_evlist *evlist,
250 const char *sys, const char *name, void *handler)
252 struct perf_evsel *evsel;
254 evsel = perf_evsel__newtp(sys, name, evlist->nr_entries);
258 evsel->handler = handler;
259 perf_evlist__add(evlist, evsel);
263 void perf_evlist__disable(struct perf_evlist *evlist)
266 struct perf_evsel *pos;
267 int nr_cpus = cpu_map__nr(evlist->cpus);
268 int nr_threads = thread_map__nr(evlist->threads);
270 for (cpu = 0; cpu < nr_cpus; cpu++) {
271 list_for_each_entry(pos, &evlist->entries, node) {
272 if (!perf_evsel__is_group_leader(pos) || !pos->fd)
274 for (thread = 0; thread < nr_threads; thread++)
275 ioctl(FD(pos, cpu, thread),
276 PERF_EVENT_IOC_DISABLE, 0);
281 void perf_evlist__enable(struct perf_evlist *evlist)
284 struct perf_evsel *pos;
285 int nr_cpus = cpu_map__nr(evlist->cpus);
286 int nr_threads = thread_map__nr(evlist->threads);
288 for (cpu = 0; cpu < nr_cpus; cpu++) {
289 list_for_each_entry(pos, &evlist->entries, node) {
290 if (!perf_evsel__is_group_leader(pos) || !pos->fd)
292 for (thread = 0; thread < nr_threads; thread++)
293 ioctl(FD(pos, cpu, thread),
294 PERF_EVENT_IOC_ENABLE, 0);
299 int perf_evlist__disable_event(struct perf_evlist *evlist,
300 struct perf_evsel *evsel)
302 int cpu, thread, err;
307 for (cpu = 0; cpu < evlist->cpus->nr; cpu++) {
308 for (thread = 0; thread < evlist->threads->nr; thread++) {
309 err = ioctl(FD(evsel, cpu, thread),
310 PERF_EVENT_IOC_DISABLE, 0);
318 int perf_evlist__enable_event(struct perf_evlist *evlist,
319 struct perf_evsel *evsel)
321 int cpu, thread, err;
326 for (cpu = 0; cpu < evlist->cpus->nr; cpu++) {
327 for (thread = 0; thread < evlist->threads->nr; thread++) {
328 err = ioctl(FD(evsel, cpu, thread),
329 PERF_EVENT_IOC_ENABLE, 0);
337 static int perf_evlist__alloc_pollfd(struct perf_evlist *evlist)
339 int nr_cpus = cpu_map__nr(evlist->cpus);
340 int nr_threads = thread_map__nr(evlist->threads);
341 int nfds = nr_cpus * nr_threads * evlist->nr_entries;
342 evlist->pollfd = malloc(sizeof(struct pollfd) * nfds);
343 return evlist->pollfd != NULL ? 0 : -ENOMEM;
346 void perf_evlist__add_pollfd(struct perf_evlist *evlist, int fd)
348 fcntl(fd, F_SETFL, O_NONBLOCK);
349 evlist->pollfd[evlist->nr_fds].fd = fd;
350 evlist->pollfd[evlist->nr_fds].events = POLLIN;
354 static void perf_evlist__id_hash(struct perf_evlist *evlist,
355 struct perf_evsel *evsel,
356 int cpu, int thread, u64 id)
359 struct perf_sample_id *sid = SID(evsel, cpu, thread);
363 hash = hash_64(sid->id, PERF_EVLIST__HLIST_BITS);
364 hlist_add_head(&sid->node, &evlist->heads[hash]);
367 void perf_evlist__id_add(struct perf_evlist *evlist, struct perf_evsel *evsel,
368 int cpu, int thread, u64 id)
370 perf_evlist__id_hash(evlist, evsel, cpu, thread, id);
371 evsel->id[evsel->ids++] = id;
374 static int perf_evlist__id_add_fd(struct perf_evlist *evlist,
375 struct perf_evsel *evsel,
376 int cpu, int thread, int fd)
378 u64 read_data[4] = { 0, };
379 int id_idx = 1; /* The first entry is the counter value */
383 ret = ioctl(fd, PERF_EVENT_IOC_ID, &id);
390 /* Legacy way to get event id.. All hail to old kernels! */
393 * This way does not work with group format read, so bail
396 if (perf_evlist__read_format(evlist) & PERF_FORMAT_GROUP)
399 if (!(evsel->attr.read_format & PERF_FORMAT_ID) ||
400 read(fd, &read_data, sizeof(read_data)) == -1)
403 if (evsel->attr.read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
405 if (evsel->attr.read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
408 id = read_data[id_idx];
411 perf_evlist__id_add(evlist, evsel, cpu, thread, id);
415 struct perf_sample_id *perf_evlist__id2sid(struct perf_evlist *evlist, u64 id)
417 struct hlist_head *head;
418 struct perf_sample_id *sid;
421 hash = hash_64(id, PERF_EVLIST__HLIST_BITS);
422 head = &evlist->heads[hash];
424 hlist_for_each_entry(sid, head, node)
431 struct perf_evsel *perf_evlist__id2evsel(struct perf_evlist *evlist, u64 id)
433 struct perf_sample_id *sid;
435 if (evlist->nr_entries == 1)
436 return perf_evlist__first(evlist);
438 sid = perf_evlist__id2sid(evlist, id);
442 if (!perf_evlist__sample_id_all(evlist))
443 return perf_evlist__first(evlist);
448 static int perf_evlist__event2id(struct perf_evlist *evlist,
449 union perf_event *event, u64 *id)
451 const u64 *array = event->sample.array;
454 n = (event->header.size - sizeof(event->header)) >> 3;
456 if (event->header.type == PERF_RECORD_SAMPLE) {
457 if (evlist->id_pos >= n)
459 *id = array[evlist->id_pos];
461 if (evlist->is_pos > n)
469 static struct perf_evsel *perf_evlist__event2evsel(struct perf_evlist *evlist,
470 union perf_event *event)
472 struct perf_evsel *first = perf_evlist__first(evlist);
473 struct hlist_head *head;
474 struct perf_sample_id *sid;
478 if (evlist->nr_entries == 1)
481 if (!first->attr.sample_id_all &&
482 event->header.type != PERF_RECORD_SAMPLE)
485 if (perf_evlist__event2id(evlist, event, &id))
488 /* Synthesized events have an id of zero */
492 hash = hash_64(id, PERF_EVLIST__HLIST_BITS);
493 head = &evlist->heads[hash];
495 hlist_for_each_entry(sid, head, node) {
502 union perf_event *perf_evlist__mmap_read(struct perf_evlist *evlist, int idx)
504 struct perf_mmap *md = &evlist->mmap[idx];
505 unsigned int head = perf_mmap__read_head(md);
506 unsigned int old = md->prev;
507 unsigned char *data = md->base + page_size;
508 union perf_event *event = NULL;
510 if (evlist->overwrite) {
512 * If we're further behind than half the buffer, there's a chance
513 * the writer will bite our tail and mess up the samples under us.
515 * If we somehow ended up ahead of the head, we got messed up.
517 * In either case, truncate and restart at head.
519 int diff = head - old;
520 if (diff > md->mask / 2 || diff < 0) {
521 fprintf(stderr, "WARNING: failed to keep up with mmap data.\n");
524 * head points to a known good entry, start there.
533 event = (union perf_event *)&data[old & md->mask];
534 size = event->header.size;
537 * Event straddles the mmap boundary -- header should always
538 * be inside due to u64 alignment of output.
540 if ((old & md->mask) + size != ((old + size) & md->mask)) {
541 unsigned int offset = old;
542 unsigned int len = min(sizeof(*event), size), cpy;
543 void *dst = md->event_copy;
546 cpy = min(md->mask + 1 - (offset & md->mask), len);
547 memcpy(dst, &data[offset & md->mask], cpy);
553 event = (union perf_event *) md->event_copy;
564 void perf_evlist__mmap_consume(struct perf_evlist *evlist, int idx)
566 if (!evlist->overwrite) {
567 struct perf_mmap *md = &evlist->mmap[idx];
568 unsigned int old = md->prev;
570 perf_mmap__write_tail(md, old);
574 static void __perf_evlist__munmap(struct perf_evlist *evlist, int idx)
576 if (evlist->mmap[idx].base != NULL) {
577 munmap(evlist->mmap[idx].base, evlist->mmap_len);
578 evlist->mmap[idx].base = NULL;
582 void perf_evlist__munmap(struct perf_evlist *evlist)
586 for (i = 0; i < evlist->nr_mmaps; i++)
587 __perf_evlist__munmap(evlist, i);
593 static int perf_evlist__alloc_mmap(struct perf_evlist *evlist)
595 evlist->nr_mmaps = cpu_map__nr(evlist->cpus);
596 if (cpu_map__empty(evlist->cpus))
597 evlist->nr_mmaps = thread_map__nr(evlist->threads);
598 evlist->mmap = zalloc(evlist->nr_mmaps * sizeof(struct perf_mmap));
599 return evlist->mmap != NULL ? 0 : -ENOMEM;
602 static int __perf_evlist__mmap(struct perf_evlist *evlist,
603 int idx, int prot, int mask, int fd)
605 evlist->mmap[idx].prev = 0;
606 evlist->mmap[idx].mask = mask;
607 evlist->mmap[idx].base = mmap(NULL, evlist->mmap_len, prot,
609 if (evlist->mmap[idx].base == MAP_FAILED) {
610 pr_debug2("failed to mmap perf event ring buffer, error %d\n",
612 evlist->mmap[idx].base = NULL;
616 perf_evlist__add_pollfd(evlist, fd);
620 static int perf_evlist__mmap_per_evsel(struct perf_evlist *evlist, int idx,
621 int prot, int mask, int cpu, int thread,
624 struct perf_evsel *evsel;
626 list_for_each_entry(evsel, &evlist->entries, node) {
627 int fd = FD(evsel, cpu, thread);
631 if (__perf_evlist__mmap(evlist, idx, prot, mask,
635 if (ioctl(fd, PERF_EVENT_IOC_SET_OUTPUT, *output) != 0)
639 if ((evsel->attr.read_format & PERF_FORMAT_ID) &&
640 perf_evlist__id_add_fd(evlist, evsel, cpu, thread, fd) < 0)
647 static int perf_evlist__mmap_per_cpu(struct perf_evlist *evlist, int prot,
651 int nr_cpus = cpu_map__nr(evlist->cpus);
652 int nr_threads = thread_map__nr(evlist->threads);
654 pr_debug2("perf event ring buffer mmapped per cpu\n");
655 for (cpu = 0; cpu < nr_cpus; cpu++) {
658 for (thread = 0; thread < nr_threads; thread++) {
659 if (perf_evlist__mmap_per_evsel(evlist, cpu, prot, mask,
660 cpu, thread, &output))
668 for (cpu = 0; cpu < nr_cpus; cpu++)
669 __perf_evlist__munmap(evlist, cpu);
673 static int perf_evlist__mmap_per_thread(struct perf_evlist *evlist, int prot,
677 int nr_threads = thread_map__nr(evlist->threads);
679 pr_debug2("perf event ring buffer mmapped per thread\n");
680 for (thread = 0; thread < nr_threads; thread++) {
683 if (perf_evlist__mmap_per_evsel(evlist, thread, prot, mask, 0,
691 for (thread = 0; thread < nr_threads; thread++)
692 __perf_evlist__munmap(evlist, thread);
696 static size_t perf_evlist__mmap_size(unsigned long pages)
698 /* 512 kiB: default amount of unprivileged mlocked memory */
699 if (pages == UINT_MAX)
700 pages = (512 * 1024) / page_size;
701 else if (!is_power_of_2(pages))
704 return (pages + 1) * page_size;
707 int perf_evlist__parse_mmap_pages(const struct option *opt, const char *str,
708 int unset __maybe_unused)
710 unsigned int *mmap_pages = opt->value;
711 unsigned long pages, val;
713 static struct parse_tag tags[] = {
714 { .tag = 'B', .mult = 1 },
715 { .tag = 'K', .mult = 1 << 10 },
716 { .tag = 'M', .mult = 1 << 20 },
717 { .tag = 'G', .mult = 1 << 30 },
721 val = parse_tag_value(str, tags);
722 if (val != (unsigned long) -1) {
723 /* we got file size value */
724 pages = PERF_ALIGN(val, page_size) / page_size;
725 if (pages < (1UL << 31) && !is_power_of_2(pages)) {
726 pages = next_pow2(pages);
727 pr_info("rounding mmap pages size to %lu (%lu pages)\n",
728 pages * page_size, pages);
731 /* we got pages count value */
733 pages = strtoul(str, &eptr, 10);
735 pr_err("failed to parse --mmap_pages/-m value\n");
740 if (pages > UINT_MAX || pages > SIZE_MAX / page_size) {
741 pr_err("--mmap_pages/-m value too big\n");
745 size = perf_evlist__mmap_size(pages);
747 pr_err("--mmap_pages/-m value must be a power of two.");
756 * perf_evlist__mmap - Create mmaps to receive events.
757 * @evlist: list of events
758 * @pages: map length in pages
759 * @overwrite: overwrite older events?
761 * If @overwrite is %false the user needs to signal event consumption using
762 * perf_mmap__write_tail(). Using perf_evlist__mmap_read() does this
765 * Return: %0 on success, negative error code otherwise.
767 int perf_evlist__mmap(struct perf_evlist *evlist, unsigned int pages,
770 struct perf_evsel *evsel;
771 const struct cpu_map *cpus = evlist->cpus;
772 const struct thread_map *threads = evlist->threads;
773 int prot = PROT_READ | (overwrite ? 0 : PROT_WRITE), mask;
775 if (evlist->mmap == NULL && perf_evlist__alloc_mmap(evlist) < 0)
778 if (evlist->pollfd == NULL && perf_evlist__alloc_pollfd(evlist) < 0)
781 evlist->overwrite = overwrite;
782 evlist->mmap_len = perf_evlist__mmap_size(pages);
783 pr_debug("mmap size %zuB\n", evlist->mmap_len);
784 mask = evlist->mmap_len - page_size - 1;
786 list_for_each_entry(evsel, &evlist->entries, node) {
787 if ((evsel->attr.read_format & PERF_FORMAT_ID) &&
788 evsel->sample_id == NULL &&
789 perf_evsel__alloc_id(evsel, cpu_map__nr(cpus), threads->nr) < 0)
793 if (cpu_map__empty(cpus))
794 return perf_evlist__mmap_per_thread(evlist, prot, mask);
796 return perf_evlist__mmap_per_cpu(evlist, prot, mask);
799 int perf_evlist__create_maps(struct perf_evlist *evlist,
800 struct perf_target *target)
802 evlist->threads = thread_map__new_str(target->pid, target->tid,
805 if (evlist->threads == NULL)
808 if (perf_target__has_task(target))
809 evlist->cpus = cpu_map__dummy_new();
810 else if (!perf_target__has_cpu(target) && !target->uses_mmap)
811 evlist->cpus = cpu_map__dummy_new();
813 evlist->cpus = cpu_map__new(target->cpu_list);
815 if (evlist->cpus == NULL)
816 goto out_delete_threads;
821 thread_map__delete(evlist->threads);
825 void perf_evlist__delete_maps(struct perf_evlist *evlist)
827 cpu_map__delete(evlist->cpus);
828 thread_map__delete(evlist->threads);
830 evlist->threads = NULL;
833 int perf_evlist__apply_filters(struct perf_evlist *evlist)
835 struct perf_evsel *evsel;
837 const int ncpus = cpu_map__nr(evlist->cpus),
838 nthreads = thread_map__nr(evlist->threads);
840 list_for_each_entry(evsel, &evlist->entries, node) {
841 if (evsel->filter == NULL)
844 err = perf_evsel__set_filter(evsel, ncpus, nthreads, evsel->filter);
852 int perf_evlist__set_filter(struct perf_evlist *evlist, const char *filter)
854 struct perf_evsel *evsel;
856 const int ncpus = cpu_map__nr(evlist->cpus),
857 nthreads = thread_map__nr(evlist->threads);
859 list_for_each_entry(evsel, &evlist->entries, node) {
860 err = perf_evsel__set_filter(evsel, ncpus, nthreads, filter);
868 bool perf_evlist__valid_sample_type(struct perf_evlist *evlist)
870 struct perf_evsel *pos;
872 if (evlist->nr_entries == 1)
875 if (evlist->id_pos < 0 || evlist->is_pos < 0)
878 list_for_each_entry(pos, &evlist->entries, node) {
879 if (pos->id_pos != evlist->id_pos ||
880 pos->is_pos != evlist->is_pos)
887 u64 __perf_evlist__combined_sample_type(struct perf_evlist *evlist)
889 struct perf_evsel *evsel;
891 if (evlist->combined_sample_type)
892 return evlist->combined_sample_type;
894 list_for_each_entry(evsel, &evlist->entries, node)
895 evlist->combined_sample_type |= evsel->attr.sample_type;
897 return evlist->combined_sample_type;
900 u64 perf_evlist__combined_sample_type(struct perf_evlist *evlist)
902 evlist->combined_sample_type = 0;
903 return __perf_evlist__combined_sample_type(evlist);
906 bool perf_evlist__valid_read_format(struct perf_evlist *evlist)
908 struct perf_evsel *first = perf_evlist__first(evlist), *pos = first;
909 u64 read_format = first->attr.read_format;
910 u64 sample_type = first->attr.sample_type;
912 list_for_each_entry_continue(pos, &evlist->entries, node) {
913 if (read_format != pos->attr.read_format)
917 /* PERF_SAMPLE_READ imples PERF_FORMAT_ID. */
918 if ((sample_type & PERF_SAMPLE_READ) &&
919 !(read_format & PERF_FORMAT_ID)) {
926 u64 perf_evlist__read_format(struct perf_evlist *evlist)
928 struct perf_evsel *first = perf_evlist__first(evlist);
929 return first->attr.read_format;
932 u16 perf_evlist__id_hdr_size(struct perf_evlist *evlist)
934 struct perf_evsel *first = perf_evlist__first(evlist);
935 struct perf_sample *data;
939 if (!first->attr.sample_id_all)
942 sample_type = first->attr.sample_type;
944 if (sample_type & PERF_SAMPLE_TID)
945 size += sizeof(data->tid) * 2;
947 if (sample_type & PERF_SAMPLE_TIME)
948 size += sizeof(data->time);
950 if (sample_type & PERF_SAMPLE_ID)
951 size += sizeof(data->id);
953 if (sample_type & PERF_SAMPLE_STREAM_ID)
954 size += sizeof(data->stream_id);
956 if (sample_type & PERF_SAMPLE_CPU)
957 size += sizeof(data->cpu) * 2;
959 if (sample_type & PERF_SAMPLE_IDENTIFIER)
960 size += sizeof(data->id);
965 bool perf_evlist__valid_sample_id_all(struct perf_evlist *evlist)
967 struct perf_evsel *first = perf_evlist__first(evlist), *pos = first;
969 list_for_each_entry_continue(pos, &evlist->entries, node) {
970 if (first->attr.sample_id_all != pos->attr.sample_id_all)
977 bool perf_evlist__sample_id_all(struct perf_evlist *evlist)
979 struct perf_evsel *first = perf_evlist__first(evlist);
980 return first->attr.sample_id_all;
983 void perf_evlist__set_selected(struct perf_evlist *evlist,
984 struct perf_evsel *evsel)
986 evlist->selected = evsel;
989 void perf_evlist__close(struct perf_evlist *evlist)
991 struct perf_evsel *evsel;
992 int ncpus = cpu_map__nr(evlist->cpus);
993 int nthreads = thread_map__nr(evlist->threads);
995 list_for_each_entry_reverse(evsel, &evlist->entries, node)
996 perf_evsel__close(evsel, ncpus, nthreads);
999 int perf_evlist__open(struct perf_evlist *evlist)
1001 struct perf_evsel *evsel;
1004 perf_evlist__update_id_pos(evlist);
1006 list_for_each_entry(evsel, &evlist->entries, node) {
1007 err = perf_evsel__open(evsel, evlist->cpus, evlist->threads);
1014 perf_evlist__close(evlist);
1019 int perf_evlist__prepare_workload(struct perf_evlist *evlist,
1020 struct perf_target *target,
1021 const char *argv[], bool pipe_output,
1024 int child_ready_pipe[2], go_pipe[2];
1027 if (pipe(child_ready_pipe) < 0) {
1028 perror("failed to create 'ready' pipe");
1032 if (pipe(go_pipe) < 0) {
1033 perror("failed to create 'go' pipe");
1034 goto out_close_ready_pipe;
1037 evlist->workload.pid = fork();
1038 if (evlist->workload.pid < 0) {
1039 perror("failed to fork");
1040 goto out_close_pipes;
1043 if (!evlist->workload.pid) {
1047 signal(SIGTERM, SIG_DFL);
1049 close(child_ready_pipe[0]);
1051 fcntl(go_pipe[0], F_SETFD, FD_CLOEXEC);
1054 * Tell the parent we're ready to go
1056 close(child_ready_pipe[1]);
1059 * Wait until the parent tells us to go.
1061 if (read(go_pipe[0], &bf, 1) == -1)
1062 perror("unable to read pipe");
1064 execvp(argv[0], (char **)argv);
1068 kill(getppid(), SIGUSR1);
1072 if (perf_target__none(target))
1073 evlist->threads->map[0] = evlist->workload.pid;
1075 close(child_ready_pipe[1]);
1078 * wait for child to settle
1080 if (read(child_ready_pipe[0], &bf, 1) == -1) {
1081 perror("unable to read pipe");
1082 goto out_close_pipes;
1085 fcntl(go_pipe[1], F_SETFD, FD_CLOEXEC);
1086 evlist->workload.cork_fd = go_pipe[1];
1087 close(child_ready_pipe[0]);
1093 out_close_ready_pipe:
1094 close(child_ready_pipe[0]);
1095 close(child_ready_pipe[1]);
1099 int perf_evlist__start_workload(struct perf_evlist *evlist)
1101 if (evlist->workload.cork_fd > 0) {
1105 * Remove the cork, let it rip!
1107 ret = write(evlist->workload.cork_fd, &bf, 1);
1109 perror("enable to write to pipe");
1111 close(evlist->workload.cork_fd);
1118 int perf_evlist__parse_sample(struct perf_evlist *evlist, union perf_event *event,
1119 struct perf_sample *sample)
1121 struct perf_evsel *evsel = perf_evlist__event2evsel(evlist, event);
1125 return perf_evsel__parse_sample(evsel, event, sample);
1128 size_t perf_evlist__fprintf(struct perf_evlist *evlist, FILE *fp)
1130 struct perf_evsel *evsel;
1133 list_for_each_entry(evsel, &evlist->entries, node) {
1134 printed += fprintf(fp, "%s%s", evsel->idx ? ", " : "",
1135 perf_evsel__name(evsel));
1138 return printed + fprintf(fp, "\n");;
1141 int perf_evlist__strerror_tp(struct perf_evlist *evlist __maybe_unused,
1142 int err, char *buf, size_t size)
1148 scnprintf(buf, size, "%s",
1149 "Error:\tUnable to find debugfs\n"
1150 "Hint:\tWas your kernel was compiled with debugfs support?\n"
1151 "Hint:\tIs the debugfs filesystem mounted?\n"
1152 "Hint:\tTry 'sudo mount -t debugfs nodev /sys/kernel/debug'");
1155 scnprintf(buf, size,
1156 "Error:\tNo permissions to read %s/tracing/events/raw_syscalls\n"
1157 "Hint:\tTry 'sudo mount -o remount,mode=755 %s'\n",
1158 debugfs_mountpoint, debugfs_mountpoint);
1161 scnprintf(buf, size, "%s", strerror_r(err, sbuf, sizeof(sbuf)));
1168 int perf_evlist__strerror_open(struct perf_evlist *evlist __maybe_unused,
1169 int err, char *buf, size_t size)
1172 char sbuf[128], *emsg = strerror_r(err, sbuf, sizeof(sbuf));
1177 printed = scnprintf(buf, size,
1179 "Hint:\tCheck /proc/sys/kernel/perf_event_paranoid setting.", emsg);
1181 if (filename__read_int("/proc/sys/kernel/perf_event_paranoid", &value))
1184 printed += scnprintf(buf + printed, size - printed, "\nHint:\t");
1187 printed += scnprintf(buf + printed, size - printed,
1188 "For your workloads it needs to be <= 1\nHint:\t");
1190 printed += scnprintf(buf + printed, size - printed,
1191 "For system wide tracing it needs to be set to -1");
1193 printed += scnprintf(buf + printed, size - printed,
1194 ".\nHint:\tThe current value is %d.", value);
1197 scnprintf(buf, size, "%s", emsg);