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 <api/fs/fs.h>
13 #include "thread_map.h"
21 #include "parse-events.h"
22 #include <subcmd/parse-options.h>
26 #include <linux/bitops.h>
27 #include <linux/hash.h>
28 #include <linux/log2.h>
29 #include <linux/err.h>
31 static void perf_mmap__munmap(struct perf_mmap *map);
32 static void perf_mmap__put(struct perf_mmap *map);
34 #define FD(e, x, y) (*(int *)xyarray__entry(e->fd, x, y))
35 #define SID(e, x, y) xyarray__entry(e->sample_id, x, y)
37 void perf_evlist__init(struct perf_evlist *evlist, struct cpu_map *cpus,
38 struct thread_map *threads)
42 for (i = 0; i < PERF_EVLIST__HLIST_SIZE; ++i)
43 INIT_HLIST_HEAD(&evlist->heads[i]);
44 INIT_LIST_HEAD(&evlist->entries);
45 perf_evlist__set_maps(evlist, cpus, threads);
46 fdarray__init(&evlist->pollfd, 64);
47 evlist->workload.pid = -1;
48 evlist->bkw_mmap_state = BKW_MMAP_NOTREADY;
51 struct perf_evlist *perf_evlist__new(void)
53 struct perf_evlist *evlist = zalloc(sizeof(*evlist));
56 perf_evlist__init(evlist, NULL, NULL);
61 struct perf_evlist *perf_evlist__new_default(void)
63 struct perf_evlist *evlist = perf_evlist__new();
65 if (evlist && perf_evlist__add_default(evlist)) {
66 perf_evlist__delete(evlist);
73 struct perf_evlist *perf_evlist__new_dummy(void)
75 struct perf_evlist *evlist = perf_evlist__new();
77 if (evlist && perf_evlist__add_dummy(evlist)) {
78 perf_evlist__delete(evlist);
86 * perf_evlist__set_id_pos - set the positions of event ids.
87 * @evlist: selected event list
89 * Events with compatible sample types all have the same id_pos
90 * and is_pos. For convenience, put a copy on evlist.
92 void perf_evlist__set_id_pos(struct perf_evlist *evlist)
94 struct perf_evsel *first = perf_evlist__first(evlist);
96 evlist->id_pos = first->id_pos;
97 evlist->is_pos = first->is_pos;
100 static void perf_evlist__update_id_pos(struct perf_evlist *evlist)
102 struct perf_evsel *evsel;
104 evlist__for_each_entry(evlist, evsel)
105 perf_evsel__calc_id_pos(evsel);
107 perf_evlist__set_id_pos(evlist);
110 static void perf_evlist__purge(struct perf_evlist *evlist)
112 struct perf_evsel *pos, *n;
114 evlist__for_each_entry_safe(evlist, n, pos) {
115 list_del_init(&pos->node);
117 perf_evsel__delete(pos);
120 evlist->nr_entries = 0;
123 void perf_evlist__exit(struct perf_evlist *evlist)
125 zfree(&evlist->mmap);
126 zfree(&evlist->backward_mmap);
127 fdarray__exit(&evlist->pollfd);
130 void perf_evlist__delete(struct perf_evlist *evlist)
135 perf_evlist__munmap(evlist);
136 perf_evlist__close(evlist);
137 cpu_map__put(evlist->cpus);
138 thread_map__put(evlist->threads);
140 evlist->threads = NULL;
141 perf_evlist__purge(evlist);
142 perf_evlist__exit(evlist);
146 static void __perf_evlist__propagate_maps(struct perf_evlist *evlist,
147 struct perf_evsel *evsel)
150 * We already have cpus for evsel (via PMU sysfs) so
151 * keep it, if there's no target cpu list defined.
153 if (!evsel->own_cpus || evlist->has_user_cpus) {
154 cpu_map__put(evsel->cpus);
155 evsel->cpus = cpu_map__get(evlist->cpus);
156 } else if (evsel->cpus != evsel->own_cpus) {
157 cpu_map__put(evsel->cpus);
158 evsel->cpus = cpu_map__get(evsel->own_cpus);
161 thread_map__put(evsel->threads);
162 evsel->threads = thread_map__get(evlist->threads);
165 static void perf_evlist__propagate_maps(struct perf_evlist *evlist)
167 struct perf_evsel *evsel;
169 evlist__for_each_entry(evlist, evsel)
170 __perf_evlist__propagate_maps(evlist, evsel);
173 void perf_evlist__add(struct perf_evlist *evlist, struct perf_evsel *entry)
175 entry->evlist = evlist;
176 list_add_tail(&entry->node, &evlist->entries);
177 entry->idx = evlist->nr_entries;
178 entry->tracking = !entry->idx;
180 if (!evlist->nr_entries++)
181 perf_evlist__set_id_pos(evlist);
183 __perf_evlist__propagate_maps(evlist, entry);
186 void perf_evlist__remove(struct perf_evlist *evlist, struct perf_evsel *evsel)
188 evsel->evlist = NULL;
189 list_del_init(&evsel->node);
190 evlist->nr_entries -= 1;
193 void perf_evlist__splice_list_tail(struct perf_evlist *evlist,
194 struct list_head *list)
196 struct perf_evsel *evsel, *temp;
198 __evlist__for_each_entry_safe(list, temp, evsel) {
199 list_del_init(&evsel->node);
200 perf_evlist__add(evlist, evsel);
204 void __perf_evlist__set_leader(struct list_head *list)
206 struct perf_evsel *evsel, *leader;
208 leader = list_entry(list->next, struct perf_evsel, node);
209 evsel = list_entry(list->prev, struct perf_evsel, node);
211 leader->nr_members = evsel->idx - leader->idx + 1;
213 __evlist__for_each_entry(list, evsel) {
214 evsel->leader = leader;
218 void perf_evlist__set_leader(struct perf_evlist *evlist)
220 if (evlist->nr_entries) {
221 evlist->nr_groups = evlist->nr_entries > 1 ? 1 : 0;
222 __perf_evlist__set_leader(&evlist->entries);
226 void perf_event_attr__set_max_precise_ip(struct perf_event_attr *attr)
228 attr->precise_ip = 3;
230 while (attr->precise_ip != 0) {
231 int fd = sys_perf_event_open(attr, 0, -1, -1, 0);
240 int perf_evlist__add_default(struct perf_evlist *evlist)
242 struct perf_evsel *evsel = perf_evsel__new_cycles();
247 perf_evlist__add(evlist, evsel);
251 int perf_evlist__add_dummy(struct perf_evlist *evlist)
253 struct perf_event_attr attr = {
254 .type = PERF_TYPE_SOFTWARE,
255 .config = PERF_COUNT_SW_DUMMY,
256 .size = sizeof(attr), /* to capture ABI version */
258 struct perf_evsel *evsel = perf_evsel__new(&attr);
263 perf_evlist__add(evlist, evsel);
267 static int perf_evlist__add_attrs(struct perf_evlist *evlist,
268 struct perf_event_attr *attrs, size_t nr_attrs)
270 struct perf_evsel *evsel, *n;
274 for (i = 0; i < nr_attrs; i++) {
275 evsel = perf_evsel__new_idx(attrs + i, evlist->nr_entries + i);
277 goto out_delete_partial_list;
278 list_add_tail(&evsel->node, &head);
281 perf_evlist__splice_list_tail(evlist, &head);
285 out_delete_partial_list:
286 __evlist__for_each_entry_safe(&head, n, evsel)
287 perf_evsel__delete(evsel);
291 int __perf_evlist__add_default_attrs(struct perf_evlist *evlist,
292 struct perf_event_attr *attrs, size_t nr_attrs)
296 for (i = 0; i < nr_attrs; i++)
297 event_attr_init(attrs + i);
299 return perf_evlist__add_attrs(evlist, attrs, nr_attrs);
303 perf_evlist__find_tracepoint_by_id(struct perf_evlist *evlist, int id)
305 struct perf_evsel *evsel;
307 evlist__for_each_entry(evlist, evsel) {
308 if (evsel->attr.type == PERF_TYPE_TRACEPOINT &&
309 (int)evsel->attr.config == id)
317 perf_evlist__find_tracepoint_by_name(struct perf_evlist *evlist,
320 struct perf_evsel *evsel;
322 evlist__for_each_entry(evlist, evsel) {
323 if ((evsel->attr.type == PERF_TYPE_TRACEPOINT) &&
324 (strcmp(evsel->name, name) == 0))
331 int perf_evlist__add_newtp(struct perf_evlist *evlist,
332 const char *sys, const char *name, void *handler)
334 struct perf_evsel *evsel = perf_evsel__newtp(sys, name);
339 evsel->handler = handler;
340 perf_evlist__add(evlist, evsel);
344 static int perf_evlist__nr_threads(struct perf_evlist *evlist,
345 struct perf_evsel *evsel)
347 if (evsel->system_wide)
350 return thread_map__nr(evlist->threads);
353 void perf_evlist__disable(struct perf_evlist *evlist)
355 struct perf_evsel *pos;
357 evlist__for_each_entry(evlist, pos) {
358 if (!perf_evsel__is_group_leader(pos) || !pos->fd)
360 perf_evsel__disable(pos);
363 evlist->enabled = false;
366 void perf_evlist__enable(struct perf_evlist *evlist)
368 struct perf_evsel *pos;
370 evlist__for_each_entry(evlist, pos) {
371 if (!perf_evsel__is_group_leader(pos) || !pos->fd)
373 perf_evsel__enable(pos);
376 evlist->enabled = true;
379 void perf_evlist__toggle_enable(struct perf_evlist *evlist)
381 (evlist->enabled ? perf_evlist__disable : perf_evlist__enable)(evlist);
384 static int perf_evlist__enable_event_cpu(struct perf_evlist *evlist,
385 struct perf_evsel *evsel, int cpu)
388 int nr_threads = perf_evlist__nr_threads(evlist, evsel);
393 for (thread = 0; thread < nr_threads; thread++) {
394 err = ioctl(FD(evsel, cpu, thread),
395 PERF_EVENT_IOC_ENABLE, 0);
402 static int perf_evlist__enable_event_thread(struct perf_evlist *evlist,
403 struct perf_evsel *evsel,
407 int nr_cpus = cpu_map__nr(evlist->cpus);
412 for (cpu = 0; cpu < nr_cpus; cpu++) {
413 err = ioctl(FD(evsel, cpu, thread), PERF_EVENT_IOC_ENABLE, 0);
420 int perf_evlist__enable_event_idx(struct perf_evlist *evlist,
421 struct perf_evsel *evsel, int idx)
423 bool per_cpu_mmaps = !cpu_map__empty(evlist->cpus);
426 return perf_evlist__enable_event_cpu(evlist, evsel, idx);
428 return perf_evlist__enable_event_thread(evlist, evsel, idx);
431 int perf_evlist__alloc_pollfd(struct perf_evlist *evlist)
433 int nr_cpus = cpu_map__nr(evlist->cpus);
434 int nr_threads = thread_map__nr(evlist->threads);
436 struct perf_evsel *evsel;
438 evlist__for_each_entry(evlist, evsel) {
439 if (evsel->system_wide)
442 nfds += nr_cpus * nr_threads;
445 if (fdarray__available_entries(&evlist->pollfd) < nfds &&
446 fdarray__grow(&evlist->pollfd, nfds) < 0)
452 static int __perf_evlist__add_pollfd(struct perf_evlist *evlist, int fd,
453 struct perf_mmap *map, short revent)
455 int pos = fdarray__add(&evlist->pollfd, fd, revent | POLLERR | POLLHUP);
457 * Save the idx so that when we filter out fds POLLHUP'ed we can
458 * close the associated evlist->mmap[] entry.
461 evlist->pollfd.priv[pos].ptr = map;
463 fcntl(fd, F_SETFL, O_NONBLOCK);
469 int perf_evlist__add_pollfd(struct perf_evlist *evlist, int fd)
471 return __perf_evlist__add_pollfd(evlist, fd, NULL, POLLIN);
474 static void perf_evlist__munmap_filtered(struct fdarray *fda, int fd,
475 void *arg __maybe_unused)
477 struct perf_mmap *map = fda->priv[fd].ptr;
483 int perf_evlist__filter_pollfd(struct perf_evlist *evlist, short revents_and_mask)
485 return fdarray__filter(&evlist->pollfd, revents_and_mask,
486 perf_evlist__munmap_filtered, NULL);
489 int perf_evlist__poll(struct perf_evlist *evlist, int timeout)
491 return fdarray__poll(&evlist->pollfd, timeout);
494 static void perf_evlist__id_hash(struct perf_evlist *evlist,
495 struct perf_evsel *evsel,
496 int cpu, int thread, u64 id)
499 struct perf_sample_id *sid = SID(evsel, cpu, thread);
503 hash = hash_64(sid->id, PERF_EVLIST__HLIST_BITS);
504 hlist_add_head(&sid->node, &evlist->heads[hash]);
507 void perf_evlist__id_add(struct perf_evlist *evlist, struct perf_evsel *evsel,
508 int cpu, int thread, u64 id)
510 perf_evlist__id_hash(evlist, evsel, cpu, thread, id);
511 evsel->id[evsel->ids++] = id;
514 int perf_evlist__id_add_fd(struct perf_evlist *evlist,
515 struct perf_evsel *evsel,
516 int cpu, int thread, int fd)
518 u64 read_data[4] = { 0, };
519 int id_idx = 1; /* The first entry is the counter value */
523 ret = ioctl(fd, PERF_EVENT_IOC_ID, &id);
530 /* Legacy way to get event id.. All hail to old kernels! */
533 * This way does not work with group format read, so bail
536 if (perf_evlist__read_format(evlist) & PERF_FORMAT_GROUP)
539 if (!(evsel->attr.read_format & PERF_FORMAT_ID) ||
540 read(fd, &read_data, sizeof(read_data)) == -1)
543 if (evsel->attr.read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
545 if (evsel->attr.read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
548 id = read_data[id_idx];
551 perf_evlist__id_add(evlist, evsel, cpu, thread, id);
555 static void perf_evlist__set_sid_idx(struct perf_evlist *evlist,
556 struct perf_evsel *evsel, int idx, int cpu,
559 struct perf_sample_id *sid = SID(evsel, cpu, thread);
561 if (evlist->cpus && cpu >= 0)
562 sid->cpu = evlist->cpus->map[cpu];
565 if (!evsel->system_wide && evlist->threads && thread >= 0)
566 sid->tid = thread_map__pid(evlist->threads, thread);
571 struct perf_sample_id *perf_evlist__id2sid(struct perf_evlist *evlist, u64 id)
573 struct hlist_head *head;
574 struct perf_sample_id *sid;
577 hash = hash_64(id, PERF_EVLIST__HLIST_BITS);
578 head = &evlist->heads[hash];
580 hlist_for_each_entry(sid, head, node)
587 struct perf_evsel *perf_evlist__id2evsel(struct perf_evlist *evlist, u64 id)
589 struct perf_sample_id *sid;
591 if (evlist->nr_entries == 1 || !id)
592 return perf_evlist__first(evlist);
594 sid = perf_evlist__id2sid(evlist, id);
598 if (!perf_evlist__sample_id_all(evlist))
599 return perf_evlist__first(evlist);
604 struct perf_evsel *perf_evlist__id2evsel_strict(struct perf_evlist *evlist,
607 struct perf_sample_id *sid;
612 sid = perf_evlist__id2sid(evlist, id);
619 static int perf_evlist__event2id(struct perf_evlist *evlist,
620 union perf_event *event, u64 *id)
622 const u64 *array = event->sample.array;
625 n = (event->header.size - sizeof(event->header)) >> 3;
627 if (event->header.type == PERF_RECORD_SAMPLE) {
628 if (evlist->id_pos >= n)
630 *id = array[evlist->id_pos];
632 if (evlist->is_pos > n)
640 struct perf_evsel *perf_evlist__event2evsel(struct perf_evlist *evlist,
641 union perf_event *event)
643 struct perf_evsel *first = perf_evlist__first(evlist);
644 struct hlist_head *head;
645 struct perf_sample_id *sid;
649 if (evlist->nr_entries == 1)
652 if (!first->attr.sample_id_all &&
653 event->header.type != PERF_RECORD_SAMPLE)
656 if (perf_evlist__event2id(evlist, event, &id))
659 /* Synthesized events have an id of zero */
663 hash = hash_64(id, PERF_EVLIST__HLIST_BITS);
664 head = &evlist->heads[hash];
666 hlist_for_each_entry(sid, head, node) {
673 static int perf_evlist__set_paused(struct perf_evlist *evlist, bool value)
677 if (!evlist->backward_mmap)
680 for (i = 0; i < evlist->nr_mmaps; i++) {
681 int fd = evlist->backward_mmap[i].fd;
686 err = ioctl(fd, PERF_EVENT_IOC_PAUSE_OUTPUT, value ? 1 : 0);
693 static int perf_evlist__pause(struct perf_evlist *evlist)
695 return perf_evlist__set_paused(evlist, true);
698 static int perf_evlist__resume(struct perf_evlist *evlist)
700 return perf_evlist__set_paused(evlist, false);
703 /* When check_messup is true, 'end' must points to a good entry */
704 static union perf_event *
705 perf_mmap__read(struct perf_mmap *md, bool check_messup, u64 start,
708 unsigned char *data = md->base + page_size;
709 union perf_event *event = NULL;
710 int diff = end - start;
714 * If we're further behind than half the buffer, there's a chance
715 * the writer will bite our tail and mess up the samples under us.
717 * If we somehow ended up ahead of the 'end', we got messed up.
719 * In either case, truncate and restart at 'end'.
721 if (diff > md->mask / 2 || diff < 0) {
722 fprintf(stderr, "WARNING: failed to keep up with mmap data.\n");
725 * 'end' points to a known good entry, start there.
732 if (diff >= (int)sizeof(event->header)) {
735 event = (union perf_event *)&data[start & md->mask];
736 size = event->header.size;
738 if (size < sizeof(event->header) || diff < (int)size) {
744 * Event straddles the mmap boundary -- header should always
745 * be inside due to u64 alignment of output.
747 if ((start & md->mask) + size != ((start + size) & md->mask)) {
748 unsigned int offset = start;
749 unsigned int len = min(sizeof(*event), size), cpy;
750 void *dst = md->event_copy;
753 cpy = min(md->mask + 1 - (offset & md->mask), len);
754 memcpy(dst, &data[offset & md->mask], cpy);
760 event = (union perf_event *) md->event_copy;
773 union perf_event *perf_mmap__read_forward(struct perf_mmap *md, bool check_messup)
779 * Check if event was unmapped due to a POLLHUP/POLLERR.
781 if (!atomic_read(&md->refcnt))
784 head = perf_mmap__read_head(md);
786 return perf_mmap__read(md, check_messup, old, head, &md->prev);
790 perf_mmap__read_backward(struct perf_mmap *md)
793 u64 start = md->prev;
796 * Check if event was unmapped due to a POLLHUP/POLLERR.
798 if (!atomic_read(&md->refcnt))
801 head = perf_mmap__read_head(md);
806 * 'head' pointer starts from 0. Kernel minus sizeof(record) form
807 * it each time when kernel writes to it, so in fact 'head' is
808 * negative. 'end' pointer is made manually by adding the size of
809 * the ring buffer to 'head' pointer, means the validate data can
810 * read is the whole ring buffer. If 'end' is positive, the ring
811 * buffer has not fully filled, so we must adjust 'end' to 0.
813 * However, since both 'head' and 'end' is unsigned, we can't
814 * simply compare 'end' against 0. Here we compare '-head' and
815 * the size of the ring buffer, where -head is the number of bytes
816 * kernel write to the ring buffer.
818 if (-head < (u64)(md->mask + 1))
821 end = head + md->mask + 1;
823 return perf_mmap__read(md, false, start, end, &md->prev);
826 union perf_event *perf_evlist__mmap_read_forward(struct perf_evlist *evlist, int idx)
828 struct perf_mmap *md = &evlist->mmap[idx];
831 * Check messup is required for forward overwritable ring buffer:
832 * memory pointed by md->prev can be overwritten in this case.
833 * No need for read-write ring buffer: kernel stop outputting when
834 * it hit md->prev (perf_mmap__consume()).
836 return perf_mmap__read_forward(md, evlist->overwrite);
839 union perf_event *perf_evlist__mmap_read_backward(struct perf_evlist *evlist, int idx)
841 struct perf_mmap *md = &evlist->mmap[idx];
844 * No need to check messup for backward ring buffer:
845 * We can always read arbitrary long data from a backward
846 * ring buffer unless we forget to pause it before reading.
848 return perf_mmap__read_backward(md);
851 union perf_event *perf_evlist__mmap_read(struct perf_evlist *evlist, int idx)
853 return perf_evlist__mmap_read_forward(evlist, idx);
856 void perf_mmap__read_catchup(struct perf_mmap *md)
860 if (!atomic_read(&md->refcnt))
863 head = perf_mmap__read_head(md);
867 void perf_evlist__mmap_read_catchup(struct perf_evlist *evlist, int idx)
869 perf_mmap__read_catchup(&evlist->mmap[idx]);
872 static bool perf_mmap__empty(struct perf_mmap *md)
874 return perf_mmap__read_head(md) == md->prev && !md->auxtrace_mmap.base;
877 static void perf_mmap__get(struct perf_mmap *map)
879 atomic_inc(&map->refcnt);
882 static void perf_mmap__put(struct perf_mmap *md)
884 BUG_ON(md->base && atomic_read(&md->refcnt) == 0);
886 if (atomic_dec_and_test(&md->refcnt))
887 perf_mmap__munmap(md);
890 void perf_mmap__consume(struct perf_mmap *md, bool overwrite)
895 perf_mmap__write_tail(md, old);
898 if (atomic_read(&md->refcnt) == 1 && perf_mmap__empty(md))
902 void perf_evlist__mmap_consume(struct perf_evlist *evlist, int idx)
904 perf_mmap__consume(&evlist->mmap[idx], evlist->overwrite);
907 int __weak auxtrace_mmap__mmap(struct auxtrace_mmap *mm __maybe_unused,
908 struct auxtrace_mmap_params *mp __maybe_unused,
909 void *userpg __maybe_unused,
910 int fd __maybe_unused)
915 void __weak auxtrace_mmap__munmap(struct auxtrace_mmap *mm __maybe_unused)
919 void __weak auxtrace_mmap_params__init(
920 struct auxtrace_mmap_params *mp __maybe_unused,
921 off_t auxtrace_offset __maybe_unused,
922 unsigned int auxtrace_pages __maybe_unused,
923 bool auxtrace_overwrite __maybe_unused)
927 void __weak auxtrace_mmap_params__set_idx(
928 struct auxtrace_mmap_params *mp __maybe_unused,
929 struct perf_evlist *evlist __maybe_unused,
930 int idx __maybe_unused,
931 bool per_cpu __maybe_unused)
935 static void perf_mmap__munmap(struct perf_mmap *map)
937 if (map->base != NULL) {
938 munmap(map->base, perf_mmap__mmap_len(map));
941 atomic_set(&map->refcnt, 0);
943 auxtrace_mmap__munmap(&map->auxtrace_mmap);
946 static void perf_evlist__munmap_nofree(struct perf_evlist *evlist)
951 for (i = 0; i < evlist->nr_mmaps; i++)
952 perf_mmap__munmap(&evlist->mmap[i]);
954 if (evlist->backward_mmap)
955 for (i = 0; i < evlist->nr_mmaps; i++)
956 perf_mmap__munmap(&evlist->backward_mmap[i]);
959 void perf_evlist__munmap(struct perf_evlist *evlist)
961 perf_evlist__munmap_nofree(evlist);
962 zfree(&evlist->mmap);
963 zfree(&evlist->backward_mmap);
966 static struct perf_mmap *perf_evlist__alloc_mmap(struct perf_evlist *evlist)
969 struct perf_mmap *map;
971 evlist->nr_mmaps = cpu_map__nr(evlist->cpus);
972 if (cpu_map__empty(evlist->cpus))
973 evlist->nr_mmaps = thread_map__nr(evlist->threads);
974 map = zalloc(evlist->nr_mmaps * sizeof(struct perf_mmap));
978 for (i = 0; i < evlist->nr_mmaps; i++)
986 struct auxtrace_mmap_params auxtrace_mp;
989 static int perf_mmap__mmap(struct perf_mmap *map,
990 struct mmap_params *mp, int fd)
993 * The last one will be done at perf_evlist__mmap_consume(), so that we
994 * make sure we don't prevent tools from consuming every last event in
997 * I.e. we can get the POLLHUP meaning that the fd doesn't exist
998 * anymore, but the last events for it are still in the ring buffer,
999 * waiting to be consumed.
1001 * Tools can chose to ignore this at their own discretion, but the
1002 * evlist layer can't just drop it when filtering events in
1003 * perf_evlist__filter_pollfd().
1005 atomic_set(&map->refcnt, 2);
1007 map->mask = mp->mask;
1008 map->base = mmap(NULL, perf_mmap__mmap_len(map), mp->prot,
1010 if (map->base == MAP_FAILED) {
1011 pr_debug2("failed to mmap perf event ring buffer, error %d\n",
1018 if (auxtrace_mmap__mmap(&map->auxtrace_mmap,
1019 &mp->auxtrace_mp, map->base, fd))
1026 perf_evlist__should_poll(struct perf_evlist *evlist __maybe_unused,
1027 struct perf_evsel *evsel)
1029 if (evsel->attr.write_backward)
1034 static int perf_evlist__mmap_per_evsel(struct perf_evlist *evlist, int idx,
1035 struct mmap_params *mp, int cpu,
1036 int thread, int *_output, int *_output_backward)
1038 struct perf_evsel *evsel;
1041 evlist__for_each_entry(evlist, evsel) {
1042 struct perf_mmap *maps = evlist->mmap;
1043 int *output = _output;
1046 if (evsel->attr.write_backward) {
1047 output = _output_backward;
1048 maps = evlist->backward_mmap;
1051 maps = perf_evlist__alloc_mmap(evlist);
1054 evlist->backward_mmap = maps;
1055 if (evlist->bkw_mmap_state == BKW_MMAP_NOTREADY)
1056 perf_evlist__toggle_bkw_mmap(evlist, BKW_MMAP_RUNNING);
1060 if (evsel->system_wide && thread)
1063 fd = FD(evsel, cpu, thread);
1065 if (*output == -1) {
1068 if (perf_mmap__mmap(&maps[idx], mp, *output) < 0)
1071 if (ioctl(fd, PERF_EVENT_IOC_SET_OUTPUT, *output) != 0)
1074 perf_mmap__get(&maps[idx]);
1077 revent = perf_evlist__should_poll(evlist, evsel) ? POLLIN : 0;
1080 * The system_wide flag causes a selected event to be opened
1081 * always without a pid. Consequently it will never get a
1082 * POLLHUP, but it is used for tracking in combination with
1083 * other events, so it should not need to be polled anyway.
1084 * Therefore don't add it for polling.
1086 if (!evsel->system_wide &&
1087 __perf_evlist__add_pollfd(evlist, fd, &maps[idx], revent) < 0) {
1088 perf_mmap__put(&maps[idx]);
1092 if (evsel->attr.read_format & PERF_FORMAT_ID) {
1093 if (perf_evlist__id_add_fd(evlist, evsel, cpu, thread,
1096 perf_evlist__set_sid_idx(evlist, evsel, idx, cpu,
1104 static int perf_evlist__mmap_per_cpu(struct perf_evlist *evlist,
1105 struct mmap_params *mp)
1108 int nr_cpus = cpu_map__nr(evlist->cpus);
1109 int nr_threads = thread_map__nr(evlist->threads);
1111 pr_debug2("perf event ring buffer mmapped per cpu\n");
1112 for (cpu = 0; cpu < nr_cpus; cpu++) {
1114 int output_backward = -1;
1116 auxtrace_mmap_params__set_idx(&mp->auxtrace_mp, evlist, cpu,
1119 for (thread = 0; thread < nr_threads; thread++) {
1120 if (perf_evlist__mmap_per_evsel(evlist, cpu, mp, cpu,
1121 thread, &output, &output_backward))
1129 perf_evlist__munmap_nofree(evlist);
1133 static int perf_evlist__mmap_per_thread(struct perf_evlist *evlist,
1134 struct mmap_params *mp)
1137 int nr_threads = thread_map__nr(evlist->threads);
1139 pr_debug2("perf event ring buffer mmapped per thread\n");
1140 for (thread = 0; thread < nr_threads; thread++) {
1142 int output_backward = -1;
1144 auxtrace_mmap_params__set_idx(&mp->auxtrace_mp, evlist, thread,
1147 if (perf_evlist__mmap_per_evsel(evlist, thread, mp, 0, thread,
1148 &output, &output_backward))
1155 perf_evlist__munmap_nofree(evlist);
1159 unsigned long perf_event_mlock_kb_in_pages(void)
1161 unsigned long pages;
1164 if (sysctl__read_int("kernel/perf_event_mlock_kb", &max) < 0) {
1166 * Pick a once upon a time good value, i.e. things look
1167 * strange since we can't read a sysctl value, but lets not
1172 max -= (page_size / 1024);
1175 pages = (max * 1024) / page_size;
1176 if (!is_power_of_2(pages))
1177 pages = rounddown_pow_of_two(pages);
1182 static size_t perf_evlist__mmap_size(unsigned long pages)
1184 if (pages == UINT_MAX)
1185 pages = perf_event_mlock_kb_in_pages();
1186 else if (!is_power_of_2(pages))
1189 return (pages + 1) * page_size;
1192 static long parse_pages_arg(const char *str, unsigned long min,
1195 unsigned long pages, val;
1196 static struct parse_tag tags[] = {
1197 { .tag = 'B', .mult = 1 },
1198 { .tag = 'K', .mult = 1 << 10 },
1199 { .tag = 'M', .mult = 1 << 20 },
1200 { .tag = 'G', .mult = 1 << 30 },
1207 val = parse_tag_value(str, tags);
1208 if (val != (unsigned long) -1) {
1209 /* we got file size value */
1210 pages = PERF_ALIGN(val, page_size) / page_size;
1212 /* we got pages count value */
1214 pages = strtoul(str, &eptr, 10);
1219 if (pages == 0 && min == 0) {
1220 /* leave number of pages at 0 */
1221 } else if (!is_power_of_2(pages)) {
1222 /* round pages up to next power of 2 */
1223 pages = roundup_pow_of_two(pages);
1226 pr_info("rounding mmap pages size to %lu bytes (%lu pages)\n",
1227 pages * page_size, pages);
1236 int __perf_evlist__parse_mmap_pages(unsigned int *mmap_pages, const char *str)
1238 unsigned long max = UINT_MAX;
1241 if (max > SIZE_MAX / page_size)
1242 max = SIZE_MAX / page_size;
1244 pages = parse_pages_arg(str, 1, max);
1246 pr_err("Invalid argument for --mmap_pages/-m\n");
1250 *mmap_pages = pages;
1254 int perf_evlist__parse_mmap_pages(const struct option *opt, const char *str,
1255 int unset __maybe_unused)
1257 return __perf_evlist__parse_mmap_pages(opt->value, str);
1261 * perf_evlist__mmap_ex - Create mmaps to receive events.
1262 * @evlist: list of events
1263 * @pages: map length in pages
1264 * @overwrite: overwrite older events?
1265 * @auxtrace_pages - auxtrace map length in pages
1266 * @auxtrace_overwrite - overwrite older auxtrace data?
1268 * If @overwrite is %false the user needs to signal event consumption using
1269 * perf_mmap__write_tail(). Using perf_evlist__mmap_read() does this
1272 * Similarly, if @auxtrace_overwrite is %false the user needs to signal data
1273 * consumption using auxtrace_mmap__write_tail().
1275 * Return: %0 on success, negative error code otherwise.
1277 int perf_evlist__mmap_ex(struct perf_evlist *evlist, unsigned int pages,
1278 bool overwrite, unsigned int auxtrace_pages,
1279 bool auxtrace_overwrite)
1281 struct perf_evsel *evsel;
1282 const struct cpu_map *cpus = evlist->cpus;
1283 const struct thread_map *threads = evlist->threads;
1284 struct mmap_params mp = {
1285 .prot = PROT_READ | (overwrite ? 0 : PROT_WRITE),
1289 evlist->mmap = perf_evlist__alloc_mmap(evlist);
1293 if (evlist->pollfd.entries == NULL && perf_evlist__alloc_pollfd(evlist) < 0)
1296 evlist->overwrite = overwrite;
1297 evlist->mmap_len = perf_evlist__mmap_size(pages);
1298 pr_debug("mmap size %zuB\n", evlist->mmap_len);
1299 mp.mask = evlist->mmap_len - page_size - 1;
1301 auxtrace_mmap_params__init(&mp.auxtrace_mp, evlist->mmap_len,
1302 auxtrace_pages, auxtrace_overwrite);
1304 evlist__for_each_entry(evlist, evsel) {
1305 if ((evsel->attr.read_format & PERF_FORMAT_ID) &&
1306 evsel->sample_id == NULL &&
1307 perf_evsel__alloc_id(evsel, cpu_map__nr(cpus), threads->nr) < 0)
1311 if (cpu_map__empty(cpus))
1312 return perf_evlist__mmap_per_thread(evlist, &mp);
1314 return perf_evlist__mmap_per_cpu(evlist, &mp);
1317 int perf_evlist__mmap(struct perf_evlist *evlist, unsigned int pages,
1320 return perf_evlist__mmap_ex(evlist, pages, overwrite, 0, false);
1323 int perf_evlist__create_maps(struct perf_evlist *evlist, struct target *target)
1325 struct cpu_map *cpus;
1326 struct thread_map *threads;
1328 threads = thread_map__new_str(target->pid, target->tid, target->uid);
1333 if (target__uses_dummy_map(target))
1334 cpus = cpu_map__dummy_new();
1336 cpus = cpu_map__new(target->cpu_list);
1339 goto out_delete_threads;
1341 evlist->has_user_cpus = !!target->cpu_list;
1343 perf_evlist__set_maps(evlist, cpus, threads);
1348 thread_map__put(threads);
1352 void perf_evlist__set_maps(struct perf_evlist *evlist, struct cpu_map *cpus,
1353 struct thread_map *threads)
1356 * Allow for the possibility that one or another of the maps isn't being
1357 * changed i.e. don't put it. Note we are assuming the maps that are
1358 * being applied are brand new and evlist is taking ownership of the
1359 * original reference count of 1. If that is not the case it is up to
1360 * the caller to increase the reference count.
1362 if (cpus != evlist->cpus) {
1363 cpu_map__put(evlist->cpus);
1364 evlist->cpus = cpu_map__get(cpus);
1367 if (threads != evlist->threads) {
1368 thread_map__put(evlist->threads);
1369 evlist->threads = thread_map__get(threads);
1372 perf_evlist__propagate_maps(evlist);
1375 void __perf_evlist__set_sample_bit(struct perf_evlist *evlist,
1376 enum perf_event_sample_format bit)
1378 struct perf_evsel *evsel;
1380 evlist__for_each_entry(evlist, evsel)
1381 __perf_evsel__set_sample_bit(evsel, bit);
1384 void __perf_evlist__reset_sample_bit(struct perf_evlist *evlist,
1385 enum perf_event_sample_format bit)
1387 struct perf_evsel *evsel;
1389 evlist__for_each_entry(evlist, evsel)
1390 __perf_evsel__reset_sample_bit(evsel, bit);
1393 int perf_evlist__apply_filters(struct perf_evlist *evlist, struct perf_evsel **err_evsel)
1395 struct perf_evsel *evsel;
1397 const int ncpus = cpu_map__nr(evlist->cpus),
1398 nthreads = thread_map__nr(evlist->threads);
1400 evlist__for_each_entry(evlist, evsel) {
1401 if (evsel->filter == NULL)
1405 * filters only work for tracepoint event, which doesn't have cpu limit.
1406 * So evlist and evsel should always be same.
1408 err = perf_evsel__apply_filter(evsel, ncpus, nthreads, evsel->filter);
1418 int perf_evlist__set_filter(struct perf_evlist *evlist, const char *filter)
1420 struct perf_evsel *evsel;
1423 evlist__for_each_entry(evlist, evsel) {
1424 if (evsel->attr.type != PERF_TYPE_TRACEPOINT)
1427 err = perf_evsel__set_filter(evsel, filter);
1435 int perf_evlist__set_filter_pids(struct perf_evlist *evlist, size_t npids, pid_t *pids)
1441 for (i = 0; i < npids; ++i) {
1443 if (asprintf(&filter, "common_pid != %d", pids[i]) < 0)
1448 if (asprintf(&tmp, "%s && common_pid != %d", filter, pids[i]) < 0)
1456 ret = perf_evlist__set_filter(evlist, filter);
1462 int perf_evlist__set_filter_pid(struct perf_evlist *evlist, pid_t pid)
1464 return perf_evlist__set_filter_pids(evlist, 1, &pid);
1467 bool perf_evlist__valid_sample_type(struct perf_evlist *evlist)
1469 struct perf_evsel *pos;
1471 if (evlist->nr_entries == 1)
1474 if (evlist->id_pos < 0 || evlist->is_pos < 0)
1477 evlist__for_each_entry(evlist, pos) {
1478 if (pos->id_pos != evlist->id_pos ||
1479 pos->is_pos != evlist->is_pos)
1486 u64 __perf_evlist__combined_sample_type(struct perf_evlist *evlist)
1488 struct perf_evsel *evsel;
1490 if (evlist->combined_sample_type)
1491 return evlist->combined_sample_type;
1493 evlist__for_each_entry(evlist, evsel)
1494 evlist->combined_sample_type |= evsel->attr.sample_type;
1496 return evlist->combined_sample_type;
1499 u64 perf_evlist__combined_sample_type(struct perf_evlist *evlist)
1501 evlist->combined_sample_type = 0;
1502 return __perf_evlist__combined_sample_type(evlist);
1505 u64 perf_evlist__combined_branch_type(struct perf_evlist *evlist)
1507 struct perf_evsel *evsel;
1508 u64 branch_type = 0;
1510 evlist__for_each_entry(evlist, evsel)
1511 branch_type |= evsel->attr.branch_sample_type;
1515 bool perf_evlist__valid_read_format(struct perf_evlist *evlist)
1517 struct perf_evsel *first = perf_evlist__first(evlist), *pos = first;
1518 u64 read_format = first->attr.read_format;
1519 u64 sample_type = first->attr.sample_type;
1521 evlist__for_each_entry(evlist, pos) {
1522 if (read_format != pos->attr.read_format)
1526 /* PERF_SAMPLE_READ imples PERF_FORMAT_ID. */
1527 if ((sample_type & PERF_SAMPLE_READ) &&
1528 !(read_format & PERF_FORMAT_ID)) {
1535 u64 perf_evlist__read_format(struct perf_evlist *evlist)
1537 struct perf_evsel *first = perf_evlist__first(evlist);
1538 return first->attr.read_format;
1541 u16 perf_evlist__id_hdr_size(struct perf_evlist *evlist)
1543 struct perf_evsel *first = perf_evlist__first(evlist);
1544 struct perf_sample *data;
1548 if (!first->attr.sample_id_all)
1551 sample_type = first->attr.sample_type;
1553 if (sample_type & PERF_SAMPLE_TID)
1554 size += sizeof(data->tid) * 2;
1556 if (sample_type & PERF_SAMPLE_TIME)
1557 size += sizeof(data->time);
1559 if (sample_type & PERF_SAMPLE_ID)
1560 size += sizeof(data->id);
1562 if (sample_type & PERF_SAMPLE_STREAM_ID)
1563 size += sizeof(data->stream_id);
1565 if (sample_type & PERF_SAMPLE_CPU)
1566 size += sizeof(data->cpu) * 2;
1568 if (sample_type & PERF_SAMPLE_IDENTIFIER)
1569 size += sizeof(data->id);
1574 bool perf_evlist__valid_sample_id_all(struct perf_evlist *evlist)
1576 struct perf_evsel *first = perf_evlist__first(evlist), *pos = first;
1578 evlist__for_each_entry_continue(evlist, pos) {
1579 if (first->attr.sample_id_all != pos->attr.sample_id_all)
1586 bool perf_evlist__sample_id_all(struct perf_evlist *evlist)
1588 struct perf_evsel *first = perf_evlist__first(evlist);
1589 return first->attr.sample_id_all;
1592 void perf_evlist__set_selected(struct perf_evlist *evlist,
1593 struct perf_evsel *evsel)
1595 evlist->selected = evsel;
1598 void perf_evlist__close(struct perf_evlist *evlist)
1600 struct perf_evsel *evsel;
1601 int ncpus = cpu_map__nr(evlist->cpus);
1602 int nthreads = thread_map__nr(evlist->threads);
1605 evlist__for_each_entry_reverse(evlist, evsel) {
1606 n = evsel->cpus ? evsel->cpus->nr : ncpus;
1607 perf_evsel__close(evsel, n, nthreads);
1611 static int perf_evlist__create_syswide_maps(struct perf_evlist *evlist)
1613 struct cpu_map *cpus;
1614 struct thread_map *threads;
1618 * Try reading /sys/devices/system/cpu/online to get
1621 * FIXME: -ENOMEM is the best we can do here, the cpu_map
1622 * code needs an overhaul to properly forward the
1623 * error, and we may not want to do that fallback to a
1624 * default cpu identity map :-\
1626 cpus = cpu_map__new(NULL);
1630 threads = thread_map__new_dummy();
1634 perf_evlist__set_maps(evlist, cpus, threads);
1642 int perf_evlist__open(struct perf_evlist *evlist)
1644 struct perf_evsel *evsel;
1648 * Default: one fd per CPU, all threads, aka systemwide
1649 * as sys_perf_event_open(cpu = -1, thread = -1) is EINVAL
1651 if (evlist->threads == NULL && evlist->cpus == NULL) {
1652 err = perf_evlist__create_syswide_maps(evlist);
1657 perf_evlist__update_id_pos(evlist);
1659 evlist__for_each_entry(evlist, evsel) {
1660 err = perf_evsel__open(evsel, evsel->cpus, evsel->threads);
1667 perf_evlist__close(evlist);
1672 int perf_evlist__prepare_workload(struct perf_evlist *evlist, struct target *target,
1673 const char *argv[], bool pipe_output,
1674 void (*exec_error)(int signo, siginfo_t *info, void *ucontext))
1676 int child_ready_pipe[2], go_pipe[2];
1679 if (pipe(child_ready_pipe) < 0) {
1680 perror("failed to create 'ready' pipe");
1684 if (pipe(go_pipe) < 0) {
1685 perror("failed to create 'go' pipe");
1686 goto out_close_ready_pipe;
1689 evlist->workload.pid = fork();
1690 if (evlist->workload.pid < 0) {
1691 perror("failed to fork");
1692 goto out_close_pipes;
1695 if (!evlist->workload.pid) {
1701 signal(SIGTERM, SIG_DFL);
1703 close(child_ready_pipe[0]);
1705 fcntl(go_pipe[0], F_SETFD, FD_CLOEXEC);
1708 * Tell the parent we're ready to go
1710 close(child_ready_pipe[1]);
1713 * Wait until the parent tells us to go.
1715 ret = read(go_pipe[0], &bf, 1);
1717 * The parent will ask for the execvp() to be performed by
1718 * writing exactly one byte, in workload.cork_fd, usually via
1719 * perf_evlist__start_workload().
1721 * For cancelling the workload without actually running it,
1722 * the parent will just close workload.cork_fd, without writing
1723 * anything, i.e. read will return zero and we just exit()
1728 perror("unable to read pipe");
1732 execvp(argv[0], (char **)argv);
1737 val.sival_int = errno;
1738 if (sigqueue(getppid(), SIGUSR1, val))
1746 struct sigaction act = {
1747 .sa_flags = SA_SIGINFO,
1748 .sa_sigaction = exec_error,
1750 sigaction(SIGUSR1, &act, NULL);
1753 if (target__none(target)) {
1754 if (evlist->threads == NULL) {
1755 fprintf(stderr, "FATAL: evlist->threads need to be set at this point (%s:%d).\n",
1756 __func__, __LINE__);
1757 goto out_close_pipes;
1759 thread_map__set_pid(evlist->threads, 0, evlist->workload.pid);
1762 close(child_ready_pipe[1]);
1765 * wait for child to settle
1767 if (read(child_ready_pipe[0], &bf, 1) == -1) {
1768 perror("unable to read pipe");
1769 goto out_close_pipes;
1772 fcntl(go_pipe[1], F_SETFD, FD_CLOEXEC);
1773 evlist->workload.cork_fd = go_pipe[1];
1774 close(child_ready_pipe[0]);
1780 out_close_ready_pipe:
1781 close(child_ready_pipe[0]);
1782 close(child_ready_pipe[1]);
1786 int perf_evlist__start_workload(struct perf_evlist *evlist)
1788 if (evlist->workload.cork_fd > 0) {
1792 * Remove the cork, let it rip!
1794 ret = write(evlist->workload.cork_fd, &bf, 1);
1796 perror("enable to write to pipe");
1798 close(evlist->workload.cork_fd);
1805 int perf_evlist__parse_sample(struct perf_evlist *evlist, union perf_event *event,
1806 struct perf_sample *sample)
1808 struct perf_evsel *evsel = perf_evlist__event2evsel(evlist, event);
1812 return perf_evsel__parse_sample(evsel, event, sample);
1815 size_t perf_evlist__fprintf(struct perf_evlist *evlist, FILE *fp)
1817 struct perf_evsel *evsel;
1820 evlist__for_each_entry(evlist, evsel) {
1821 printed += fprintf(fp, "%s%s", evsel->idx ? ", " : "",
1822 perf_evsel__name(evsel));
1825 return printed + fprintf(fp, "\n");
1828 int perf_evlist__strerror_open(struct perf_evlist *evlist,
1829 int err, char *buf, size_t size)
1832 char sbuf[STRERR_BUFSIZE], *emsg = str_error_r(err, sbuf, sizeof(sbuf));
1837 printed = scnprintf(buf, size,
1839 "Hint:\tCheck /proc/sys/kernel/perf_event_paranoid setting.", emsg);
1841 value = perf_event_paranoid();
1843 printed += scnprintf(buf + printed, size - printed, "\nHint:\t");
1846 printed += scnprintf(buf + printed, size - printed,
1847 "For your workloads it needs to be <= 1\nHint:\t");
1849 printed += scnprintf(buf + printed, size - printed,
1850 "For system wide tracing it needs to be set to -1.\n");
1852 printed += scnprintf(buf + printed, size - printed,
1853 "Hint:\tTry: 'sudo sh -c \"echo -1 > /proc/sys/kernel/perf_event_paranoid\"'\n"
1854 "Hint:\tThe current value is %d.", value);
1857 struct perf_evsel *first = perf_evlist__first(evlist);
1860 if (sysctl__read_int("kernel/perf_event_max_sample_rate", &max_freq) < 0)
1863 if (first->attr.sample_freq < (u64)max_freq)
1866 printed = scnprintf(buf, size,
1868 "Hint:\tCheck /proc/sys/kernel/perf_event_max_sample_rate.\n"
1869 "Hint:\tThe current value is %d and %" PRIu64 " is being requested.",
1870 emsg, max_freq, first->attr.sample_freq);
1875 scnprintf(buf, size, "%s", emsg);
1882 int perf_evlist__strerror_mmap(struct perf_evlist *evlist, int err, char *buf, size_t size)
1884 char sbuf[STRERR_BUFSIZE], *emsg = str_error_r(err, sbuf, sizeof(sbuf));
1885 int pages_attempted = evlist->mmap_len / 1024, pages_max_per_user, printed = 0;
1889 sysctl__read_int("kernel/perf_event_mlock_kb", &pages_max_per_user);
1890 printed += scnprintf(buf + printed, size - printed,
1892 "Hint:\tCheck /proc/sys/kernel/perf_event_mlock_kb (%d kB) setting.\n"
1893 "Hint:\tTried using %zd kB.\n",
1894 emsg, pages_max_per_user, pages_attempted);
1896 if (pages_attempted >= pages_max_per_user) {
1897 printed += scnprintf(buf + printed, size - printed,
1898 "Hint:\tTry 'sudo sh -c \"echo %d > /proc/sys/kernel/perf_event_mlock_kb\"', or\n",
1899 pages_max_per_user + pages_attempted);
1902 printed += scnprintf(buf + printed, size - printed,
1903 "Hint:\tTry using a smaller -m/--mmap-pages value.");
1906 scnprintf(buf, size, "%s", emsg);
1913 void perf_evlist__to_front(struct perf_evlist *evlist,
1914 struct perf_evsel *move_evsel)
1916 struct perf_evsel *evsel, *n;
1919 if (move_evsel == perf_evlist__first(evlist))
1922 evlist__for_each_entry_safe(evlist, n, evsel) {
1923 if (evsel->leader == move_evsel->leader)
1924 list_move_tail(&evsel->node, &move);
1927 list_splice(&move, &evlist->entries);
1930 void perf_evlist__set_tracking_event(struct perf_evlist *evlist,
1931 struct perf_evsel *tracking_evsel)
1933 struct perf_evsel *evsel;
1935 if (tracking_evsel->tracking)
1938 evlist__for_each_entry(evlist, evsel) {
1939 if (evsel != tracking_evsel)
1940 evsel->tracking = false;
1943 tracking_evsel->tracking = true;
1947 perf_evlist__find_evsel_by_str(struct perf_evlist *evlist,
1950 struct perf_evsel *evsel;
1952 evlist__for_each_entry(evlist, evsel) {
1955 if (strcmp(str, evsel->name) == 0)
1962 void perf_evlist__toggle_bkw_mmap(struct perf_evlist *evlist,
1963 enum bkw_mmap_state state)
1965 enum bkw_mmap_state old_state = evlist->bkw_mmap_state;
1972 if (!evlist->backward_mmap)
1975 switch (old_state) {
1976 case BKW_MMAP_NOTREADY: {
1977 if (state != BKW_MMAP_RUNNING)
1981 case BKW_MMAP_RUNNING: {
1982 if (state != BKW_MMAP_DATA_PENDING)
1987 case BKW_MMAP_DATA_PENDING: {
1988 if (state != BKW_MMAP_EMPTY)
1992 case BKW_MMAP_EMPTY: {
1993 if (state != BKW_MMAP_RUNNING)
1999 WARN_ONCE(1, "Shouldn't get there\n");
2002 evlist->bkw_mmap_state = state;
2006 perf_evlist__pause(evlist);
2009 perf_evlist__resume(evlist);