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 entry->idx = evlist->nr_entries;
122 if (!evlist->nr_entries++)
123 perf_evlist__set_id_pos(evlist);
126 void perf_evlist__splice_list_tail(struct perf_evlist *evlist,
127 struct list_head *list,
130 bool set_id_pos = !evlist->nr_entries;
132 list_splice_tail(list, &evlist->entries);
133 evlist->nr_entries += nr_entries;
135 perf_evlist__set_id_pos(evlist);
138 void __perf_evlist__set_leader(struct list_head *list)
140 struct perf_evsel *evsel, *leader;
142 leader = list_entry(list->next, struct perf_evsel, node);
143 evsel = list_entry(list->prev, struct perf_evsel, node);
145 leader->nr_members = evsel->idx - leader->idx + 1;
147 list_for_each_entry(evsel, list, node) {
148 evsel->leader = leader;
152 void perf_evlist__set_leader(struct perf_evlist *evlist)
154 if (evlist->nr_entries) {
155 evlist->nr_groups = evlist->nr_entries > 1 ? 1 : 0;
156 __perf_evlist__set_leader(&evlist->entries);
160 int perf_evlist__add_default(struct perf_evlist *evlist)
162 struct perf_event_attr attr = {
163 .type = PERF_TYPE_HARDWARE,
164 .config = PERF_COUNT_HW_CPU_CYCLES,
166 struct perf_evsel *evsel;
168 event_attr_init(&attr);
170 evsel = perf_evsel__new(&attr);
174 /* use strdup() because free(evsel) assumes name is allocated */
175 evsel->name = strdup("cycles");
179 perf_evlist__add(evlist, evsel);
182 perf_evsel__delete(evsel);
187 static int perf_evlist__add_attrs(struct perf_evlist *evlist,
188 struct perf_event_attr *attrs, size_t nr_attrs)
190 struct perf_evsel *evsel, *n;
194 for (i = 0; i < nr_attrs; i++) {
195 evsel = perf_evsel__new_idx(attrs + i, evlist->nr_entries + i);
197 goto out_delete_partial_list;
198 list_add_tail(&evsel->node, &head);
201 perf_evlist__splice_list_tail(evlist, &head, nr_attrs);
205 out_delete_partial_list:
206 list_for_each_entry_safe(evsel, n, &head, node)
207 perf_evsel__delete(evsel);
211 int __perf_evlist__add_default_attrs(struct perf_evlist *evlist,
212 struct perf_event_attr *attrs, size_t nr_attrs)
216 for (i = 0; i < nr_attrs; i++)
217 event_attr_init(attrs + i);
219 return perf_evlist__add_attrs(evlist, attrs, nr_attrs);
223 perf_evlist__find_tracepoint_by_id(struct perf_evlist *evlist, int id)
225 struct perf_evsel *evsel;
227 list_for_each_entry(evsel, &evlist->entries, node) {
228 if (evsel->attr.type == PERF_TYPE_TRACEPOINT &&
229 (int)evsel->attr.config == id)
237 perf_evlist__find_tracepoint_by_name(struct perf_evlist *evlist,
240 struct perf_evsel *evsel;
242 list_for_each_entry(evsel, &evlist->entries, node) {
243 if ((evsel->attr.type == PERF_TYPE_TRACEPOINT) &&
244 (strcmp(evsel->name, name) == 0))
251 int perf_evlist__add_newtp(struct perf_evlist *evlist,
252 const char *sys, const char *name, void *handler)
254 struct perf_evsel *evsel = perf_evsel__newtp(sys, name);
259 evsel->handler = handler;
260 perf_evlist__add(evlist, evsel);
264 void perf_evlist__disable(struct perf_evlist *evlist)
267 struct perf_evsel *pos;
268 int nr_cpus = cpu_map__nr(evlist->cpus);
269 int nr_threads = thread_map__nr(evlist->threads);
271 for (cpu = 0; cpu < nr_cpus; cpu++) {
272 list_for_each_entry(pos, &evlist->entries, node) {
273 if (!perf_evsel__is_group_leader(pos) || !pos->fd)
275 for (thread = 0; thread < nr_threads; thread++)
276 ioctl(FD(pos, cpu, thread),
277 PERF_EVENT_IOC_DISABLE, 0);
282 void perf_evlist__enable(struct perf_evlist *evlist)
285 struct perf_evsel *pos;
286 int nr_cpus = cpu_map__nr(evlist->cpus);
287 int nr_threads = thread_map__nr(evlist->threads);
289 for (cpu = 0; cpu < nr_cpus; cpu++) {
290 list_for_each_entry(pos, &evlist->entries, node) {
291 if (!perf_evsel__is_group_leader(pos) || !pos->fd)
293 for (thread = 0; thread < nr_threads; thread++)
294 ioctl(FD(pos, cpu, thread),
295 PERF_EVENT_IOC_ENABLE, 0);
300 int perf_evlist__disable_event(struct perf_evlist *evlist,
301 struct perf_evsel *evsel)
303 int cpu, thread, err;
308 for (cpu = 0; cpu < evlist->cpus->nr; cpu++) {
309 for (thread = 0; thread < evlist->threads->nr; thread++) {
310 err = ioctl(FD(evsel, cpu, thread),
311 PERF_EVENT_IOC_DISABLE, 0);
319 int perf_evlist__enable_event(struct perf_evlist *evlist,
320 struct perf_evsel *evsel)
322 int cpu, thread, err;
327 for (cpu = 0; cpu < evlist->cpus->nr; cpu++) {
328 for (thread = 0; thread < evlist->threads->nr; thread++) {
329 err = ioctl(FD(evsel, cpu, thread),
330 PERF_EVENT_IOC_ENABLE, 0);
338 static int perf_evlist__alloc_pollfd(struct perf_evlist *evlist)
340 int nr_cpus = cpu_map__nr(evlist->cpus);
341 int nr_threads = thread_map__nr(evlist->threads);
342 int nfds = nr_cpus * nr_threads * evlist->nr_entries;
343 evlist->pollfd = malloc(sizeof(struct pollfd) * nfds);
344 return evlist->pollfd != NULL ? 0 : -ENOMEM;
347 void perf_evlist__add_pollfd(struct perf_evlist *evlist, int fd)
349 fcntl(fd, F_SETFL, O_NONBLOCK);
350 evlist->pollfd[evlist->nr_fds].fd = fd;
351 evlist->pollfd[evlist->nr_fds].events = POLLIN;
355 static void perf_evlist__id_hash(struct perf_evlist *evlist,
356 struct perf_evsel *evsel,
357 int cpu, int thread, u64 id)
360 struct perf_sample_id *sid = SID(evsel, cpu, thread);
364 hash = hash_64(sid->id, PERF_EVLIST__HLIST_BITS);
365 hlist_add_head(&sid->node, &evlist->heads[hash]);
368 void perf_evlist__id_add(struct perf_evlist *evlist, struct perf_evsel *evsel,
369 int cpu, int thread, u64 id)
371 perf_evlist__id_hash(evlist, evsel, cpu, thread, id);
372 evsel->id[evsel->ids++] = id;
375 static int perf_evlist__id_add_fd(struct perf_evlist *evlist,
376 struct perf_evsel *evsel,
377 int cpu, int thread, int fd)
379 u64 read_data[4] = { 0, };
380 int id_idx = 1; /* The first entry is the counter value */
384 ret = ioctl(fd, PERF_EVENT_IOC_ID, &id);
391 /* Legacy way to get event id.. All hail to old kernels! */
394 * This way does not work with group format read, so bail
397 if (perf_evlist__read_format(evlist) & PERF_FORMAT_GROUP)
400 if (!(evsel->attr.read_format & PERF_FORMAT_ID) ||
401 read(fd, &read_data, sizeof(read_data)) == -1)
404 if (evsel->attr.read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
406 if (evsel->attr.read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
409 id = read_data[id_idx];
412 perf_evlist__id_add(evlist, evsel, cpu, thread, id);
416 struct perf_sample_id *perf_evlist__id2sid(struct perf_evlist *evlist, u64 id)
418 struct hlist_head *head;
419 struct perf_sample_id *sid;
422 hash = hash_64(id, PERF_EVLIST__HLIST_BITS);
423 head = &evlist->heads[hash];
425 hlist_for_each_entry(sid, head, node)
432 struct perf_evsel *perf_evlist__id2evsel(struct perf_evlist *evlist, u64 id)
434 struct perf_sample_id *sid;
436 if (evlist->nr_entries == 1)
437 return perf_evlist__first(evlist);
439 sid = perf_evlist__id2sid(evlist, id);
443 if (!perf_evlist__sample_id_all(evlist))
444 return perf_evlist__first(evlist);
449 static int perf_evlist__event2id(struct perf_evlist *evlist,
450 union perf_event *event, u64 *id)
452 const u64 *array = event->sample.array;
455 n = (event->header.size - sizeof(event->header)) >> 3;
457 if (event->header.type == PERF_RECORD_SAMPLE) {
458 if (evlist->id_pos >= n)
460 *id = array[evlist->id_pos];
462 if (evlist->is_pos > n)
470 static struct perf_evsel *perf_evlist__event2evsel(struct perf_evlist *evlist,
471 union perf_event *event)
473 struct perf_evsel *first = perf_evlist__first(evlist);
474 struct hlist_head *head;
475 struct perf_sample_id *sid;
479 if (evlist->nr_entries == 1)
482 if (!first->attr.sample_id_all &&
483 event->header.type != PERF_RECORD_SAMPLE)
486 if (perf_evlist__event2id(evlist, event, &id))
489 /* Synthesized events have an id of zero */
493 hash = hash_64(id, PERF_EVLIST__HLIST_BITS);
494 head = &evlist->heads[hash];
496 hlist_for_each_entry(sid, head, node) {
503 union perf_event *perf_evlist__mmap_read(struct perf_evlist *evlist, int idx)
505 struct perf_mmap *md = &evlist->mmap[idx];
506 unsigned int head = perf_mmap__read_head(md);
507 unsigned int old = md->prev;
508 unsigned char *data = md->base + page_size;
509 union perf_event *event = NULL;
511 if (evlist->overwrite) {
513 * If we're further behind than half the buffer, there's a chance
514 * the writer will bite our tail and mess up the samples under us.
516 * If we somehow ended up ahead of the head, we got messed up.
518 * In either case, truncate and restart at head.
520 int diff = head - old;
521 if (diff > md->mask / 2 || diff < 0) {
522 fprintf(stderr, "WARNING: failed to keep up with mmap data.\n");
525 * head points to a known good entry, start there.
534 event = (union perf_event *)&data[old & md->mask];
535 size = event->header.size;
538 * Event straddles the mmap boundary -- header should always
539 * be inside due to u64 alignment of output.
541 if ((old & md->mask) + size != ((old + size) & md->mask)) {
542 unsigned int offset = old;
543 unsigned int len = min(sizeof(*event), size), cpy;
544 void *dst = md->event_copy;
547 cpy = min(md->mask + 1 - (offset & md->mask), len);
548 memcpy(dst, &data[offset & md->mask], cpy);
554 event = (union perf_event *) md->event_copy;
565 void perf_evlist__mmap_consume(struct perf_evlist *evlist, int idx)
567 if (!evlist->overwrite) {
568 struct perf_mmap *md = &evlist->mmap[idx];
569 unsigned int old = md->prev;
571 perf_mmap__write_tail(md, old);
575 static void __perf_evlist__munmap(struct perf_evlist *evlist, int idx)
577 if (evlist->mmap[idx].base != NULL) {
578 munmap(evlist->mmap[idx].base, evlist->mmap_len);
579 evlist->mmap[idx].base = NULL;
583 void perf_evlist__munmap(struct perf_evlist *evlist)
587 for (i = 0; i < evlist->nr_mmaps; i++)
588 __perf_evlist__munmap(evlist, i);
594 static int perf_evlist__alloc_mmap(struct perf_evlist *evlist)
596 evlist->nr_mmaps = cpu_map__nr(evlist->cpus);
597 if (cpu_map__empty(evlist->cpus))
598 evlist->nr_mmaps = thread_map__nr(evlist->threads);
599 evlist->mmap = zalloc(evlist->nr_mmaps * sizeof(struct perf_mmap));
600 return evlist->mmap != NULL ? 0 : -ENOMEM;
603 static int __perf_evlist__mmap(struct perf_evlist *evlist,
604 int idx, int prot, int mask, int fd)
606 evlist->mmap[idx].prev = 0;
607 evlist->mmap[idx].mask = mask;
608 evlist->mmap[idx].base = mmap(NULL, evlist->mmap_len, prot,
610 if (evlist->mmap[idx].base == MAP_FAILED) {
611 pr_debug2("failed to mmap perf event ring buffer, error %d\n",
613 evlist->mmap[idx].base = NULL;
617 perf_evlist__add_pollfd(evlist, fd);
621 static int perf_evlist__mmap_per_evsel(struct perf_evlist *evlist, int idx,
622 int prot, int mask, int cpu, int thread,
625 struct perf_evsel *evsel;
627 list_for_each_entry(evsel, &evlist->entries, node) {
628 int fd = FD(evsel, cpu, thread);
632 if (__perf_evlist__mmap(evlist, idx, prot, mask,
636 if (ioctl(fd, PERF_EVENT_IOC_SET_OUTPUT, *output) != 0)
640 if ((evsel->attr.read_format & PERF_FORMAT_ID) &&
641 perf_evlist__id_add_fd(evlist, evsel, cpu, thread, fd) < 0)
648 static int perf_evlist__mmap_per_cpu(struct perf_evlist *evlist, int prot,
652 int nr_cpus = cpu_map__nr(evlist->cpus);
653 int nr_threads = thread_map__nr(evlist->threads);
655 pr_debug2("perf event ring buffer mmapped per cpu\n");
656 for (cpu = 0; cpu < nr_cpus; cpu++) {
659 for (thread = 0; thread < nr_threads; thread++) {
660 if (perf_evlist__mmap_per_evsel(evlist, cpu, prot, mask,
661 cpu, thread, &output))
669 for (cpu = 0; cpu < nr_cpus; cpu++)
670 __perf_evlist__munmap(evlist, cpu);
674 static int perf_evlist__mmap_per_thread(struct perf_evlist *evlist, int prot,
678 int nr_threads = thread_map__nr(evlist->threads);
680 pr_debug2("perf event ring buffer mmapped per thread\n");
681 for (thread = 0; thread < nr_threads; thread++) {
684 if (perf_evlist__mmap_per_evsel(evlist, thread, prot, mask, 0,
692 for (thread = 0; thread < nr_threads; thread++)
693 __perf_evlist__munmap(evlist, thread);
697 static size_t perf_evlist__mmap_size(unsigned long pages)
699 /* 512 kiB: default amount of unprivileged mlocked memory */
700 if (pages == UINT_MAX)
701 pages = (512 * 1024) / page_size;
702 else if (!is_power_of_2(pages))
705 return (pages + 1) * page_size;
708 static long parse_pages_arg(const char *str, unsigned long min,
711 unsigned long pages, val;
712 static struct parse_tag tags[] = {
713 { .tag = 'B', .mult = 1 },
714 { .tag = 'K', .mult = 1 << 10 },
715 { .tag = 'M', .mult = 1 << 20 },
716 { .tag = 'G', .mult = 1 << 30 },
723 val = parse_tag_value(str, tags);
724 if (val != (unsigned long) -1) {
725 /* we got file size value */
726 pages = PERF_ALIGN(val, page_size) / page_size;
728 /* we got pages count value */
730 pages = strtoul(str, &eptr, 10);
735 if ((pages == 0) && (min == 0)) {
736 /* leave number of pages at 0 */
737 } else if (pages < (1UL << 31) && !is_power_of_2(pages)) {
738 /* round pages up to next power of 2 */
739 pages = next_pow2(pages);
740 pr_info("rounding mmap pages size to %lu bytes (%lu pages)\n",
741 pages * page_size, pages);
750 int perf_evlist__parse_mmap_pages(const struct option *opt, const char *str,
751 int unset __maybe_unused)
753 unsigned int *mmap_pages = opt->value;
754 unsigned long max = UINT_MAX;
757 if (max < SIZE_MAX / page_size)
758 max = SIZE_MAX / page_size;
760 pages = parse_pages_arg(str, 1, max);
762 pr_err("Invalid argument for --mmap_pages/-m\n");
771 * perf_evlist__mmap - Create mmaps to receive events.
772 * @evlist: list of events
773 * @pages: map length in pages
774 * @overwrite: overwrite older events?
776 * If @overwrite is %false the user needs to signal event consumption using
777 * perf_mmap__write_tail(). Using perf_evlist__mmap_read() does this
780 * Return: %0 on success, negative error code otherwise.
782 int perf_evlist__mmap(struct perf_evlist *evlist, unsigned int pages,
785 struct perf_evsel *evsel;
786 const struct cpu_map *cpus = evlist->cpus;
787 const struct thread_map *threads = evlist->threads;
788 int prot = PROT_READ | (overwrite ? 0 : PROT_WRITE), mask;
790 if (evlist->mmap == NULL && perf_evlist__alloc_mmap(evlist) < 0)
793 if (evlist->pollfd == NULL && perf_evlist__alloc_pollfd(evlist) < 0)
796 evlist->overwrite = overwrite;
797 evlist->mmap_len = perf_evlist__mmap_size(pages);
798 pr_debug("mmap size %zuB\n", evlist->mmap_len);
799 mask = evlist->mmap_len - page_size - 1;
801 list_for_each_entry(evsel, &evlist->entries, node) {
802 if ((evsel->attr.read_format & PERF_FORMAT_ID) &&
803 evsel->sample_id == NULL &&
804 perf_evsel__alloc_id(evsel, cpu_map__nr(cpus), threads->nr) < 0)
808 if (cpu_map__empty(cpus))
809 return perf_evlist__mmap_per_thread(evlist, prot, mask);
811 return perf_evlist__mmap_per_cpu(evlist, prot, mask);
814 int perf_evlist__create_maps(struct perf_evlist *evlist, struct target *target)
816 evlist->threads = thread_map__new_str(target->pid, target->tid,
819 if (evlist->threads == NULL)
822 if (target__uses_dummy_map(target))
823 evlist->cpus = cpu_map__dummy_new();
825 evlist->cpus = cpu_map__new(target->cpu_list);
827 if (evlist->cpus == NULL)
828 goto out_delete_threads;
833 thread_map__delete(evlist->threads);
837 void perf_evlist__delete_maps(struct perf_evlist *evlist)
839 cpu_map__delete(evlist->cpus);
840 thread_map__delete(evlist->threads);
842 evlist->threads = NULL;
845 int perf_evlist__apply_filters(struct perf_evlist *evlist)
847 struct perf_evsel *evsel;
849 const int ncpus = cpu_map__nr(evlist->cpus),
850 nthreads = thread_map__nr(evlist->threads);
852 list_for_each_entry(evsel, &evlist->entries, node) {
853 if (evsel->filter == NULL)
856 err = perf_evsel__set_filter(evsel, ncpus, nthreads, evsel->filter);
864 int perf_evlist__set_filter(struct perf_evlist *evlist, const char *filter)
866 struct perf_evsel *evsel;
868 const int ncpus = cpu_map__nr(evlist->cpus),
869 nthreads = thread_map__nr(evlist->threads);
871 list_for_each_entry(evsel, &evlist->entries, node) {
872 err = perf_evsel__set_filter(evsel, ncpus, nthreads, filter);
880 bool perf_evlist__valid_sample_type(struct perf_evlist *evlist)
882 struct perf_evsel *pos;
884 if (evlist->nr_entries == 1)
887 if (evlist->id_pos < 0 || evlist->is_pos < 0)
890 list_for_each_entry(pos, &evlist->entries, node) {
891 if (pos->id_pos != evlist->id_pos ||
892 pos->is_pos != evlist->is_pos)
899 u64 __perf_evlist__combined_sample_type(struct perf_evlist *evlist)
901 struct perf_evsel *evsel;
903 if (evlist->combined_sample_type)
904 return evlist->combined_sample_type;
906 list_for_each_entry(evsel, &evlist->entries, node)
907 evlist->combined_sample_type |= evsel->attr.sample_type;
909 return evlist->combined_sample_type;
912 u64 perf_evlist__combined_sample_type(struct perf_evlist *evlist)
914 evlist->combined_sample_type = 0;
915 return __perf_evlist__combined_sample_type(evlist);
918 bool perf_evlist__valid_read_format(struct perf_evlist *evlist)
920 struct perf_evsel *first = perf_evlist__first(evlist), *pos = first;
921 u64 read_format = first->attr.read_format;
922 u64 sample_type = first->attr.sample_type;
924 list_for_each_entry_continue(pos, &evlist->entries, node) {
925 if (read_format != pos->attr.read_format)
929 /* PERF_SAMPLE_READ imples PERF_FORMAT_ID. */
930 if ((sample_type & PERF_SAMPLE_READ) &&
931 !(read_format & PERF_FORMAT_ID)) {
938 u64 perf_evlist__read_format(struct perf_evlist *evlist)
940 struct perf_evsel *first = perf_evlist__first(evlist);
941 return first->attr.read_format;
944 u16 perf_evlist__id_hdr_size(struct perf_evlist *evlist)
946 struct perf_evsel *first = perf_evlist__first(evlist);
947 struct perf_sample *data;
951 if (!first->attr.sample_id_all)
954 sample_type = first->attr.sample_type;
956 if (sample_type & PERF_SAMPLE_TID)
957 size += sizeof(data->tid) * 2;
959 if (sample_type & PERF_SAMPLE_TIME)
960 size += sizeof(data->time);
962 if (sample_type & PERF_SAMPLE_ID)
963 size += sizeof(data->id);
965 if (sample_type & PERF_SAMPLE_STREAM_ID)
966 size += sizeof(data->stream_id);
968 if (sample_type & PERF_SAMPLE_CPU)
969 size += sizeof(data->cpu) * 2;
971 if (sample_type & PERF_SAMPLE_IDENTIFIER)
972 size += sizeof(data->id);
977 bool perf_evlist__valid_sample_id_all(struct perf_evlist *evlist)
979 struct perf_evsel *first = perf_evlist__first(evlist), *pos = first;
981 list_for_each_entry_continue(pos, &evlist->entries, node) {
982 if (first->attr.sample_id_all != pos->attr.sample_id_all)
989 bool perf_evlist__sample_id_all(struct perf_evlist *evlist)
991 struct perf_evsel *first = perf_evlist__first(evlist);
992 return first->attr.sample_id_all;
995 void perf_evlist__set_selected(struct perf_evlist *evlist,
996 struct perf_evsel *evsel)
998 evlist->selected = evsel;
1001 void perf_evlist__close(struct perf_evlist *evlist)
1003 struct perf_evsel *evsel;
1004 int ncpus = cpu_map__nr(evlist->cpus);
1005 int nthreads = thread_map__nr(evlist->threads);
1007 list_for_each_entry_reverse(evsel, &evlist->entries, node)
1008 perf_evsel__close(evsel, ncpus, nthreads);
1011 int perf_evlist__open(struct perf_evlist *evlist)
1013 struct perf_evsel *evsel;
1016 perf_evlist__update_id_pos(evlist);
1018 list_for_each_entry(evsel, &evlist->entries, node) {
1019 err = perf_evsel__open(evsel, evlist->cpus, evlist->threads);
1026 perf_evlist__close(evlist);
1031 int perf_evlist__prepare_workload(struct perf_evlist *evlist, struct target *target,
1032 const char *argv[], bool pipe_output,
1035 int child_ready_pipe[2], go_pipe[2];
1038 if (pipe(child_ready_pipe) < 0) {
1039 perror("failed to create 'ready' pipe");
1043 if (pipe(go_pipe) < 0) {
1044 perror("failed to create 'go' pipe");
1045 goto out_close_ready_pipe;
1048 evlist->workload.pid = fork();
1049 if (evlist->workload.pid < 0) {
1050 perror("failed to fork");
1051 goto out_close_pipes;
1054 if (!evlist->workload.pid) {
1058 signal(SIGTERM, SIG_DFL);
1060 close(child_ready_pipe[0]);
1062 fcntl(go_pipe[0], F_SETFD, FD_CLOEXEC);
1065 * Tell the parent we're ready to go
1067 close(child_ready_pipe[1]);
1070 * Wait until the parent tells us to go.
1072 if (read(go_pipe[0], &bf, 1) == -1)
1073 perror("unable to read pipe");
1075 execvp(argv[0], (char **)argv);
1079 kill(getppid(), SIGUSR1);
1083 if (target__none(target))
1084 evlist->threads->map[0] = evlist->workload.pid;
1086 close(child_ready_pipe[1]);
1089 * wait for child to settle
1091 if (read(child_ready_pipe[0], &bf, 1) == -1) {
1092 perror("unable to read pipe");
1093 goto out_close_pipes;
1096 fcntl(go_pipe[1], F_SETFD, FD_CLOEXEC);
1097 evlist->workload.cork_fd = go_pipe[1];
1098 close(child_ready_pipe[0]);
1104 out_close_ready_pipe:
1105 close(child_ready_pipe[0]);
1106 close(child_ready_pipe[1]);
1110 int perf_evlist__start_workload(struct perf_evlist *evlist)
1112 if (evlist->workload.cork_fd > 0) {
1116 * Remove the cork, let it rip!
1118 ret = write(evlist->workload.cork_fd, &bf, 1);
1120 perror("enable to write to pipe");
1122 close(evlist->workload.cork_fd);
1129 int perf_evlist__parse_sample(struct perf_evlist *evlist, union perf_event *event,
1130 struct perf_sample *sample)
1132 struct perf_evsel *evsel = perf_evlist__event2evsel(evlist, event);
1136 return perf_evsel__parse_sample(evsel, event, sample);
1139 size_t perf_evlist__fprintf(struct perf_evlist *evlist, FILE *fp)
1141 struct perf_evsel *evsel;
1144 list_for_each_entry(evsel, &evlist->entries, node) {
1145 printed += fprintf(fp, "%s%s", evsel->idx ? ", " : "",
1146 perf_evsel__name(evsel));
1149 return printed + fprintf(fp, "\n");
1152 int perf_evlist__strerror_tp(struct perf_evlist *evlist __maybe_unused,
1153 int err, char *buf, size_t size)
1159 scnprintf(buf, size, "%s",
1160 "Error:\tUnable to find debugfs\n"
1161 "Hint:\tWas your kernel was compiled with debugfs support?\n"
1162 "Hint:\tIs the debugfs filesystem mounted?\n"
1163 "Hint:\tTry 'sudo mount -t debugfs nodev /sys/kernel/debug'");
1166 scnprintf(buf, size,
1167 "Error:\tNo permissions to read %s/tracing/events/raw_syscalls\n"
1168 "Hint:\tTry 'sudo mount -o remount,mode=755 %s'\n",
1169 debugfs_mountpoint, debugfs_mountpoint);
1172 scnprintf(buf, size, "%s", strerror_r(err, sbuf, sizeof(sbuf)));
1179 int perf_evlist__strerror_open(struct perf_evlist *evlist __maybe_unused,
1180 int err, char *buf, size_t size)
1183 char sbuf[128], *emsg = strerror_r(err, sbuf, sizeof(sbuf));
1188 printed = scnprintf(buf, size,
1190 "Hint:\tCheck /proc/sys/kernel/perf_event_paranoid setting.", emsg);
1192 if (filename__read_int("/proc/sys/kernel/perf_event_paranoid", &value))
1195 printed += scnprintf(buf + printed, size - printed, "\nHint:\t");
1198 printed += scnprintf(buf + printed, size - printed,
1199 "For your workloads it needs to be <= 1\nHint:\t");
1201 printed += scnprintf(buf + printed, size - printed,
1202 "For system wide tracing it needs to be set to -1");
1204 printed += scnprintf(buf + printed, size - printed,
1205 ".\nHint:\tThe current value is %d.", value);
1208 scnprintf(buf, size, "%s", emsg);