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/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 static void perf_evlist__mmap_put(struct perf_evlist *evlist, int idx);
29 static void __perf_evlist__munmap(struct perf_evlist *evlist, int idx);
31 #define FD(e, x, y) (*(int *)xyarray__entry(e->fd, x, y))
32 #define SID(e, x, y) xyarray__entry(e->sample_id, x, y)
34 void perf_evlist__init(struct perf_evlist *evlist, struct cpu_map *cpus,
35 struct thread_map *threads)
39 for (i = 0; i < PERF_EVLIST__HLIST_SIZE; ++i)
40 INIT_HLIST_HEAD(&evlist->heads[i]);
41 INIT_LIST_HEAD(&evlist->entries);
42 perf_evlist__set_maps(evlist, cpus, threads);
43 fdarray__init(&evlist->pollfd, 64);
44 evlist->workload.pid = -1;
47 struct perf_evlist *perf_evlist__new(void)
49 struct perf_evlist *evlist = zalloc(sizeof(*evlist));
52 perf_evlist__init(evlist, NULL, NULL);
57 struct perf_evlist *perf_evlist__new_default(void)
59 struct perf_evlist *evlist = perf_evlist__new();
61 if (evlist && perf_evlist__add_default(evlist)) {
62 perf_evlist__delete(evlist);
70 * perf_evlist__set_id_pos - set the positions of event ids.
71 * @evlist: selected event list
73 * Events with compatible sample types all have the same id_pos
74 * and is_pos. For convenience, put a copy on evlist.
76 void perf_evlist__set_id_pos(struct perf_evlist *evlist)
78 struct perf_evsel *first = perf_evlist__first(evlist);
80 evlist->id_pos = first->id_pos;
81 evlist->is_pos = first->is_pos;
84 static void perf_evlist__update_id_pos(struct perf_evlist *evlist)
86 struct perf_evsel *evsel;
88 evlist__for_each(evlist, evsel)
89 perf_evsel__calc_id_pos(evsel);
91 perf_evlist__set_id_pos(evlist);
94 static void perf_evlist__purge(struct perf_evlist *evlist)
96 struct perf_evsel *pos, *n;
98 evlist__for_each_safe(evlist, n, pos) {
99 list_del_init(&pos->node);
100 perf_evsel__delete(pos);
103 evlist->nr_entries = 0;
106 void perf_evlist__exit(struct perf_evlist *evlist)
108 zfree(&evlist->mmap);
109 fdarray__exit(&evlist->pollfd);
112 void perf_evlist__delete(struct perf_evlist *evlist)
114 perf_evlist__munmap(evlist);
115 perf_evlist__close(evlist);
116 cpu_map__delete(evlist->cpus);
117 thread_map__delete(evlist->threads);
119 evlist->threads = NULL;
120 perf_evlist__purge(evlist);
121 perf_evlist__exit(evlist);
125 void perf_evlist__add(struct perf_evlist *evlist, struct perf_evsel *entry)
127 list_add_tail(&entry->node, &evlist->entries);
128 entry->idx = evlist->nr_entries;
129 entry->tracking = !entry->idx;
131 if (!evlist->nr_entries++)
132 perf_evlist__set_id_pos(evlist);
135 void perf_evlist__splice_list_tail(struct perf_evlist *evlist,
136 struct list_head *list,
139 bool set_id_pos = !evlist->nr_entries;
141 list_splice_tail(list, &evlist->entries);
142 evlist->nr_entries += nr_entries;
144 perf_evlist__set_id_pos(evlist);
147 void __perf_evlist__set_leader(struct list_head *list)
149 struct perf_evsel *evsel, *leader;
151 leader = list_entry(list->next, struct perf_evsel, node);
152 evsel = list_entry(list->prev, struct perf_evsel, node);
154 leader->nr_members = evsel->idx - leader->idx + 1;
156 __evlist__for_each(list, evsel) {
157 evsel->leader = leader;
161 void perf_evlist__set_leader(struct perf_evlist *evlist)
163 if (evlist->nr_entries) {
164 evlist->nr_groups = evlist->nr_entries > 1 ? 1 : 0;
165 __perf_evlist__set_leader(&evlist->entries);
169 int perf_evlist__add_default(struct perf_evlist *evlist)
171 struct perf_event_attr attr = {
172 .type = PERF_TYPE_HARDWARE,
173 .config = PERF_COUNT_HW_CPU_CYCLES,
175 struct perf_evsel *evsel;
177 event_attr_init(&attr);
179 evsel = perf_evsel__new(&attr);
183 /* use strdup() because free(evsel) assumes name is allocated */
184 evsel->name = strdup("cycles");
188 perf_evlist__add(evlist, evsel);
191 perf_evsel__delete(evsel);
196 static int perf_evlist__add_attrs(struct perf_evlist *evlist,
197 struct perf_event_attr *attrs, size_t nr_attrs)
199 struct perf_evsel *evsel, *n;
203 for (i = 0; i < nr_attrs; i++) {
204 evsel = perf_evsel__new_idx(attrs + i, evlist->nr_entries + i);
206 goto out_delete_partial_list;
207 list_add_tail(&evsel->node, &head);
210 perf_evlist__splice_list_tail(evlist, &head, nr_attrs);
214 out_delete_partial_list:
215 __evlist__for_each_safe(&head, n, evsel)
216 perf_evsel__delete(evsel);
220 int __perf_evlist__add_default_attrs(struct perf_evlist *evlist,
221 struct perf_event_attr *attrs, size_t nr_attrs)
225 for (i = 0; i < nr_attrs; i++)
226 event_attr_init(attrs + i);
228 return perf_evlist__add_attrs(evlist, attrs, nr_attrs);
232 perf_evlist__find_tracepoint_by_id(struct perf_evlist *evlist, int id)
234 struct perf_evsel *evsel;
236 evlist__for_each(evlist, evsel) {
237 if (evsel->attr.type == PERF_TYPE_TRACEPOINT &&
238 (int)evsel->attr.config == id)
246 perf_evlist__find_tracepoint_by_name(struct perf_evlist *evlist,
249 struct perf_evsel *evsel;
251 evlist__for_each(evlist, evsel) {
252 if ((evsel->attr.type == PERF_TYPE_TRACEPOINT) &&
253 (strcmp(evsel->name, name) == 0))
260 int perf_evlist__add_newtp(struct perf_evlist *evlist,
261 const char *sys, const char *name, void *handler)
263 struct perf_evsel *evsel = perf_evsel__newtp(sys, name);
268 evsel->handler = handler;
269 perf_evlist__add(evlist, evsel);
273 static int perf_evlist__nr_threads(struct perf_evlist *evlist,
274 struct perf_evsel *evsel)
276 if (evsel->system_wide)
279 return thread_map__nr(evlist->threads);
282 void perf_evlist__disable(struct perf_evlist *evlist)
285 struct perf_evsel *pos;
286 int nr_cpus = cpu_map__nr(evlist->cpus);
289 for (cpu = 0; cpu < nr_cpus; cpu++) {
290 evlist__for_each(evlist, pos) {
291 if (!perf_evsel__is_group_leader(pos) || !pos->fd)
293 nr_threads = perf_evlist__nr_threads(evlist, pos);
294 for (thread = 0; thread < nr_threads; thread++)
295 ioctl(FD(pos, cpu, thread),
296 PERF_EVENT_IOC_DISABLE, 0);
301 void perf_evlist__enable(struct perf_evlist *evlist)
304 struct perf_evsel *pos;
305 int nr_cpus = cpu_map__nr(evlist->cpus);
308 for (cpu = 0; cpu < nr_cpus; cpu++) {
309 evlist__for_each(evlist, pos) {
310 if (!perf_evsel__is_group_leader(pos) || !pos->fd)
312 nr_threads = perf_evlist__nr_threads(evlist, pos);
313 for (thread = 0; thread < nr_threads; thread++)
314 ioctl(FD(pos, cpu, thread),
315 PERF_EVENT_IOC_ENABLE, 0);
320 int perf_evlist__disable_event(struct perf_evlist *evlist,
321 struct perf_evsel *evsel)
323 int cpu, thread, err;
324 int nr_cpus = cpu_map__nr(evlist->cpus);
325 int nr_threads = perf_evlist__nr_threads(evlist, evsel);
330 for (cpu = 0; cpu < nr_cpus; cpu++) {
331 for (thread = 0; thread < nr_threads; thread++) {
332 err = ioctl(FD(evsel, cpu, thread),
333 PERF_EVENT_IOC_DISABLE, 0);
341 int perf_evlist__enable_event(struct perf_evlist *evlist,
342 struct perf_evsel *evsel)
344 int cpu, thread, err;
345 int nr_cpus = cpu_map__nr(evlist->cpus);
346 int nr_threads = perf_evlist__nr_threads(evlist, evsel);
351 for (cpu = 0; cpu < nr_cpus; cpu++) {
352 for (thread = 0; thread < nr_threads; thread++) {
353 err = ioctl(FD(evsel, cpu, thread),
354 PERF_EVENT_IOC_ENABLE, 0);
362 static int perf_evlist__enable_event_cpu(struct perf_evlist *evlist,
363 struct perf_evsel *evsel, int cpu)
366 int nr_threads = perf_evlist__nr_threads(evlist, evsel);
371 for (thread = 0; thread < nr_threads; thread++) {
372 err = ioctl(FD(evsel, cpu, thread),
373 PERF_EVENT_IOC_ENABLE, 0);
380 static int perf_evlist__enable_event_thread(struct perf_evlist *evlist,
381 struct perf_evsel *evsel,
385 int nr_cpus = cpu_map__nr(evlist->cpus);
390 for (cpu = 0; cpu < nr_cpus; cpu++) {
391 err = ioctl(FD(evsel, cpu, thread), PERF_EVENT_IOC_ENABLE, 0);
398 int perf_evlist__enable_event_idx(struct perf_evlist *evlist,
399 struct perf_evsel *evsel, int idx)
401 bool per_cpu_mmaps = !cpu_map__empty(evlist->cpus);
404 return perf_evlist__enable_event_cpu(evlist, evsel, idx);
406 return perf_evlist__enable_event_thread(evlist, evsel, idx);
409 int perf_evlist__alloc_pollfd(struct perf_evlist *evlist)
411 int nr_cpus = cpu_map__nr(evlist->cpus);
412 int nr_threads = thread_map__nr(evlist->threads);
414 struct perf_evsel *evsel;
416 evlist__for_each(evlist, evsel) {
417 if (evsel->system_wide)
420 nfds += nr_cpus * nr_threads;
423 if (fdarray__available_entries(&evlist->pollfd) < nfds &&
424 fdarray__grow(&evlist->pollfd, nfds) < 0)
430 static int __perf_evlist__add_pollfd(struct perf_evlist *evlist, int fd, int idx)
432 int pos = fdarray__add(&evlist->pollfd, fd, POLLIN | POLLERR | POLLHUP);
434 * Save the idx so that when we filter out fds POLLHUP'ed we can
435 * close the associated evlist->mmap[] entry.
438 evlist->pollfd.priv[pos].idx = idx;
440 fcntl(fd, F_SETFL, O_NONBLOCK);
446 int perf_evlist__add_pollfd(struct perf_evlist *evlist, int fd)
448 return __perf_evlist__add_pollfd(evlist, fd, -1);
451 static void perf_evlist__munmap_filtered(struct fdarray *fda, int fd)
453 struct perf_evlist *evlist = container_of(fda, struct perf_evlist, pollfd);
455 perf_evlist__mmap_put(evlist, fda->priv[fd].idx);
458 int perf_evlist__filter_pollfd(struct perf_evlist *evlist, short revents_and_mask)
460 return fdarray__filter(&evlist->pollfd, revents_and_mask,
461 perf_evlist__munmap_filtered);
464 int perf_evlist__poll(struct perf_evlist *evlist, int timeout)
466 return fdarray__poll(&evlist->pollfd, timeout);
469 static void perf_evlist__id_hash(struct perf_evlist *evlist,
470 struct perf_evsel *evsel,
471 int cpu, int thread, u64 id)
474 struct perf_sample_id *sid = SID(evsel, cpu, thread);
478 hash = hash_64(sid->id, PERF_EVLIST__HLIST_BITS);
479 hlist_add_head(&sid->node, &evlist->heads[hash]);
482 void perf_evlist__id_add(struct perf_evlist *evlist, struct perf_evsel *evsel,
483 int cpu, int thread, u64 id)
485 perf_evlist__id_hash(evlist, evsel, cpu, thread, id);
486 evsel->id[evsel->ids++] = id;
489 static int perf_evlist__id_add_fd(struct perf_evlist *evlist,
490 struct perf_evsel *evsel,
491 int cpu, int thread, int fd)
493 u64 read_data[4] = { 0, };
494 int id_idx = 1; /* The first entry is the counter value */
498 ret = ioctl(fd, PERF_EVENT_IOC_ID, &id);
505 /* Legacy way to get event id.. All hail to old kernels! */
508 * This way does not work with group format read, so bail
511 if (perf_evlist__read_format(evlist) & PERF_FORMAT_GROUP)
514 if (!(evsel->attr.read_format & PERF_FORMAT_ID) ||
515 read(fd, &read_data, sizeof(read_data)) == -1)
518 if (evsel->attr.read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
520 if (evsel->attr.read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
523 id = read_data[id_idx];
526 perf_evlist__id_add(evlist, evsel, cpu, thread, id);
530 static void perf_evlist__set_sid_idx(struct perf_evlist *evlist,
531 struct perf_evsel *evsel, int idx, int cpu,
534 struct perf_sample_id *sid = SID(evsel, cpu, thread);
536 if (evlist->cpus && cpu >= 0)
537 sid->cpu = evlist->cpus->map[cpu];
540 if (!evsel->system_wide && evlist->threads && thread >= 0)
541 sid->tid = evlist->threads->map[thread];
546 struct perf_sample_id *perf_evlist__id2sid(struct perf_evlist *evlist, u64 id)
548 struct hlist_head *head;
549 struct perf_sample_id *sid;
552 hash = hash_64(id, PERF_EVLIST__HLIST_BITS);
553 head = &evlist->heads[hash];
555 hlist_for_each_entry(sid, head, node)
562 struct perf_evsel *perf_evlist__id2evsel(struct perf_evlist *evlist, u64 id)
564 struct perf_sample_id *sid;
566 if (evlist->nr_entries == 1)
567 return perf_evlist__first(evlist);
569 sid = perf_evlist__id2sid(evlist, id);
573 if (!perf_evlist__sample_id_all(evlist))
574 return perf_evlist__first(evlist);
579 static int perf_evlist__event2id(struct perf_evlist *evlist,
580 union perf_event *event, u64 *id)
582 const u64 *array = event->sample.array;
585 n = (event->header.size - sizeof(event->header)) >> 3;
587 if (event->header.type == PERF_RECORD_SAMPLE) {
588 if (evlist->id_pos >= n)
590 *id = array[evlist->id_pos];
592 if (evlist->is_pos > n)
600 static struct perf_evsel *perf_evlist__event2evsel(struct perf_evlist *evlist,
601 union perf_event *event)
603 struct perf_evsel *first = perf_evlist__first(evlist);
604 struct hlist_head *head;
605 struct perf_sample_id *sid;
609 if (evlist->nr_entries == 1)
612 if (!first->attr.sample_id_all &&
613 event->header.type != PERF_RECORD_SAMPLE)
616 if (perf_evlist__event2id(evlist, event, &id))
619 /* Synthesized events have an id of zero */
623 hash = hash_64(id, PERF_EVLIST__HLIST_BITS);
624 head = &evlist->heads[hash];
626 hlist_for_each_entry(sid, head, node) {
633 union perf_event *perf_evlist__mmap_read(struct perf_evlist *evlist, int idx)
635 struct perf_mmap *md = &evlist->mmap[idx];
636 unsigned int head = perf_mmap__read_head(md);
637 unsigned int old = md->prev;
638 unsigned char *data = md->base + page_size;
639 union perf_event *event = NULL;
641 if (evlist->overwrite) {
643 * If we're further behind than half the buffer, there's a chance
644 * the writer will bite our tail and mess up the samples under us.
646 * If we somehow ended up ahead of the head, we got messed up.
648 * In either case, truncate and restart at head.
650 int diff = head - old;
651 if (diff > md->mask / 2 || diff < 0) {
652 fprintf(stderr, "WARNING: failed to keep up with mmap data.\n");
655 * head points to a known good entry, start there.
664 event = (union perf_event *)&data[old & md->mask];
665 size = event->header.size;
668 * Event straddles the mmap boundary -- header should always
669 * be inside due to u64 alignment of output.
671 if ((old & md->mask) + size != ((old + size) & md->mask)) {
672 unsigned int offset = old;
673 unsigned int len = min(sizeof(*event), size), cpy;
674 void *dst = md->event_copy;
677 cpy = min(md->mask + 1 - (offset & md->mask), len);
678 memcpy(dst, &data[offset & md->mask], cpy);
684 event = (union perf_event *) md->event_copy;
695 static bool perf_mmap__empty(struct perf_mmap *md)
697 return perf_mmap__read_head(md) != md->prev;
700 static void perf_evlist__mmap_get(struct perf_evlist *evlist, int idx)
702 ++evlist->mmap[idx].refcnt;
705 static void perf_evlist__mmap_put(struct perf_evlist *evlist, int idx)
707 BUG_ON(evlist->mmap[idx].refcnt == 0);
709 if (--evlist->mmap[idx].refcnt == 0)
710 __perf_evlist__munmap(evlist, idx);
713 void perf_evlist__mmap_consume(struct perf_evlist *evlist, int idx)
715 struct perf_mmap *md = &evlist->mmap[idx];
717 if (!evlist->overwrite) {
718 unsigned int old = md->prev;
720 perf_mmap__write_tail(md, old);
723 if (md->refcnt == 1 && perf_mmap__empty(md))
724 perf_evlist__mmap_put(evlist, idx);
727 static void __perf_evlist__munmap(struct perf_evlist *evlist, int idx)
729 if (evlist->mmap[idx].base != NULL) {
730 munmap(evlist->mmap[idx].base, evlist->mmap_len);
731 evlist->mmap[idx].base = NULL;
732 evlist->mmap[idx].refcnt = 0;
736 void perf_evlist__munmap(struct perf_evlist *evlist)
740 if (evlist->mmap == NULL)
743 for (i = 0; i < evlist->nr_mmaps; i++)
744 __perf_evlist__munmap(evlist, i);
746 zfree(&evlist->mmap);
749 static int perf_evlist__alloc_mmap(struct perf_evlist *evlist)
751 evlist->nr_mmaps = cpu_map__nr(evlist->cpus);
752 if (cpu_map__empty(evlist->cpus))
753 evlist->nr_mmaps = thread_map__nr(evlist->threads);
754 evlist->mmap = zalloc(evlist->nr_mmaps * sizeof(struct perf_mmap));
755 return evlist->mmap != NULL ? 0 : -ENOMEM;
763 static int __perf_evlist__mmap(struct perf_evlist *evlist, int idx,
764 struct mmap_params *mp, int fd)
767 * The last one will be done at perf_evlist__mmap_consume(), so that we
768 * make sure we don't prevent tools from consuming every last event in
771 * I.e. we can get the POLLHUP meaning that the fd doesn't exist
772 * anymore, but the last events for it are still in the ring buffer,
773 * waiting to be consumed.
775 * Tools can chose to ignore this at their own discretion, but the
776 * evlist layer can't just drop it when filtering events in
777 * perf_evlist__filter_pollfd().
779 evlist->mmap[idx].refcnt = 2;
780 evlist->mmap[idx].prev = 0;
781 evlist->mmap[idx].mask = mp->mask;
782 evlist->mmap[idx].base = mmap(NULL, evlist->mmap_len, mp->prot,
784 if (evlist->mmap[idx].base == MAP_FAILED) {
785 pr_debug2("failed to mmap perf event ring buffer, error %d\n",
787 evlist->mmap[idx].base = NULL;
794 static int perf_evlist__mmap_per_evsel(struct perf_evlist *evlist, int idx,
795 struct mmap_params *mp, int cpu,
796 int thread, int *output)
798 struct perf_evsel *evsel;
800 evlist__for_each(evlist, evsel) {
803 if (evsel->system_wide && thread)
806 fd = FD(evsel, cpu, thread);
810 if (__perf_evlist__mmap(evlist, idx, mp, *output) < 0)
813 if (ioctl(fd, PERF_EVENT_IOC_SET_OUTPUT, *output) != 0)
816 perf_evlist__mmap_get(evlist, idx);
819 if (__perf_evlist__add_pollfd(evlist, fd, idx) < 0) {
820 perf_evlist__mmap_put(evlist, idx);
824 if (evsel->attr.read_format & PERF_FORMAT_ID) {
825 if (perf_evlist__id_add_fd(evlist, evsel, cpu, thread,
828 perf_evlist__set_sid_idx(evlist, evsel, idx, cpu,
836 static int perf_evlist__mmap_per_cpu(struct perf_evlist *evlist,
837 struct mmap_params *mp)
840 int nr_cpus = cpu_map__nr(evlist->cpus);
841 int nr_threads = thread_map__nr(evlist->threads);
843 pr_debug2("perf event ring buffer mmapped per cpu\n");
844 for (cpu = 0; cpu < nr_cpus; cpu++) {
847 for (thread = 0; thread < nr_threads; thread++) {
848 if (perf_evlist__mmap_per_evsel(evlist, cpu, mp, cpu,
857 for (cpu = 0; cpu < nr_cpus; cpu++)
858 __perf_evlist__munmap(evlist, cpu);
862 static int perf_evlist__mmap_per_thread(struct perf_evlist *evlist,
863 struct mmap_params *mp)
866 int nr_threads = thread_map__nr(evlist->threads);
868 pr_debug2("perf event ring buffer mmapped per thread\n");
869 for (thread = 0; thread < nr_threads; thread++) {
872 if (perf_evlist__mmap_per_evsel(evlist, thread, mp, 0, thread,
880 for (thread = 0; thread < nr_threads; thread++)
881 __perf_evlist__munmap(evlist, thread);
885 static size_t perf_evlist__mmap_size(unsigned long pages)
887 /* 512 kiB: default amount of unprivileged mlocked memory */
888 if (pages == UINT_MAX)
889 pages = (512 * 1024) / page_size;
890 else if (!is_power_of_2(pages))
893 return (pages + 1) * page_size;
896 static long parse_pages_arg(const char *str, unsigned long min,
899 unsigned long pages, val;
900 static struct parse_tag tags[] = {
901 { .tag = 'B', .mult = 1 },
902 { .tag = 'K', .mult = 1 << 10 },
903 { .tag = 'M', .mult = 1 << 20 },
904 { .tag = 'G', .mult = 1 << 30 },
911 val = parse_tag_value(str, tags);
912 if (val != (unsigned long) -1) {
913 /* we got file size value */
914 pages = PERF_ALIGN(val, page_size) / page_size;
916 /* we got pages count value */
918 pages = strtoul(str, &eptr, 10);
923 if (pages == 0 && min == 0) {
924 /* leave number of pages at 0 */
925 } else if (!is_power_of_2(pages)) {
926 /* round pages up to next power of 2 */
927 pages = next_pow2_l(pages);
930 pr_info("rounding mmap pages size to %lu bytes (%lu pages)\n",
931 pages * page_size, pages);
940 int perf_evlist__parse_mmap_pages(const struct option *opt, const char *str,
941 int unset __maybe_unused)
943 unsigned int *mmap_pages = opt->value;
944 unsigned long max = UINT_MAX;
947 if (max > SIZE_MAX / page_size)
948 max = SIZE_MAX / page_size;
950 pages = parse_pages_arg(str, 1, max);
952 pr_err("Invalid argument for --mmap_pages/-m\n");
961 * perf_evlist__mmap - Create mmaps to receive events.
962 * @evlist: list of events
963 * @pages: map length in pages
964 * @overwrite: overwrite older events?
966 * If @overwrite is %false the user needs to signal event consumption using
967 * perf_mmap__write_tail(). Using perf_evlist__mmap_read() does this
970 * Return: %0 on success, negative error code otherwise.
972 int perf_evlist__mmap(struct perf_evlist *evlist, unsigned int pages,
975 struct perf_evsel *evsel;
976 const struct cpu_map *cpus = evlist->cpus;
977 const struct thread_map *threads = evlist->threads;
978 struct mmap_params mp = {
979 .prot = PROT_READ | (overwrite ? 0 : PROT_WRITE),
982 if (evlist->mmap == NULL && perf_evlist__alloc_mmap(evlist) < 0)
985 if (evlist->pollfd.entries == NULL && perf_evlist__alloc_pollfd(evlist) < 0)
988 evlist->overwrite = overwrite;
989 evlist->mmap_len = perf_evlist__mmap_size(pages);
990 pr_debug("mmap size %zuB\n", evlist->mmap_len);
991 mp.mask = evlist->mmap_len - page_size - 1;
993 evlist__for_each(evlist, evsel) {
994 if ((evsel->attr.read_format & PERF_FORMAT_ID) &&
995 evsel->sample_id == NULL &&
996 perf_evsel__alloc_id(evsel, cpu_map__nr(cpus), threads->nr) < 0)
1000 if (cpu_map__empty(cpus))
1001 return perf_evlist__mmap_per_thread(evlist, &mp);
1003 return perf_evlist__mmap_per_cpu(evlist, &mp);
1006 int perf_evlist__create_maps(struct perf_evlist *evlist, struct target *target)
1008 evlist->threads = thread_map__new_str(target->pid, target->tid,
1011 if (evlist->threads == NULL)
1014 if (target__uses_dummy_map(target))
1015 evlist->cpus = cpu_map__dummy_new();
1017 evlist->cpus = cpu_map__new(target->cpu_list);
1019 if (evlist->cpus == NULL)
1020 goto out_delete_threads;
1025 thread_map__delete(evlist->threads);
1026 evlist->threads = NULL;
1030 int perf_evlist__apply_filters(struct perf_evlist *evlist)
1032 struct perf_evsel *evsel;
1034 const int ncpus = cpu_map__nr(evlist->cpus),
1035 nthreads = thread_map__nr(evlist->threads);
1037 evlist__for_each(evlist, evsel) {
1038 if (evsel->filter == NULL)
1041 err = perf_evsel__set_filter(evsel, ncpus, nthreads, evsel->filter);
1049 int perf_evlist__set_filter(struct perf_evlist *evlist, const char *filter)
1051 struct perf_evsel *evsel;
1053 const int ncpus = cpu_map__nr(evlist->cpus),
1054 nthreads = thread_map__nr(evlist->threads);
1056 evlist__for_each(evlist, evsel) {
1057 err = perf_evsel__set_filter(evsel, ncpus, nthreads, filter);
1065 bool perf_evlist__valid_sample_type(struct perf_evlist *evlist)
1067 struct perf_evsel *pos;
1069 if (evlist->nr_entries == 1)
1072 if (evlist->id_pos < 0 || evlist->is_pos < 0)
1075 evlist__for_each(evlist, pos) {
1076 if (pos->id_pos != evlist->id_pos ||
1077 pos->is_pos != evlist->is_pos)
1084 u64 __perf_evlist__combined_sample_type(struct perf_evlist *evlist)
1086 struct perf_evsel *evsel;
1088 if (evlist->combined_sample_type)
1089 return evlist->combined_sample_type;
1091 evlist__for_each(evlist, evsel)
1092 evlist->combined_sample_type |= evsel->attr.sample_type;
1094 return evlist->combined_sample_type;
1097 u64 perf_evlist__combined_sample_type(struct perf_evlist *evlist)
1099 evlist->combined_sample_type = 0;
1100 return __perf_evlist__combined_sample_type(evlist);
1103 bool perf_evlist__valid_read_format(struct perf_evlist *evlist)
1105 struct perf_evsel *first = perf_evlist__first(evlist), *pos = first;
1106 u64 read_format = first->attr.read_format;
1107 u64 sample_type = first->attr.sample_type;
1109 evlist__for_each(evlist, pos) {
1110 if (read_format != pos->attr.read_format)
1114 /* PERF_SAMPLE_READ imples PERF_FORMAT_ID. */
1115 if ((sample_type & PERF_SAMPLE_READ) &&
1116 !(read_format & PERF_FORMAT_ID)) {
1123 u64 perf_evlist__read_format(struct perf_evlist *evlist)
1125 struct perf_evsel *first = perf_evlist__first(evlist);
1126 return first->attr.read_format;
1129 u16 perf_evlist__id_hdr_size(struct perf_evlist *evlist)
1131 struct perf_evsel *first = perf_evlist__first(evlist);
1132 struct perf_sample *data;
1136 if (!first->attr.sample_id_all)
1139 sample_type = first->attr.sample_type;
1141 if (sample_type & PERF_SAMPLE_TID)
1142 size += sizeof(data->tid) * 2;
1144 if (sample_type & PERF_SAMPLE_TIME)
1145 size += sizeof(data->time);
1147 if (sample_type & PERF_SAMPLE_ID)
1148 size += sizeof(data->id);
1150 if (sample_type & PERF_SAMPLE_STREAM_ID)
1151 size += sizeof(data->stream_id);
1153 if (sample_type & PERF_SAMPLE_CPU)
1154 size += sizeof(data->cpu) * 2;
1156 if (sample_type & PERF_SAMPLE_IDENTIFIER)
1157 size += sizeof(data->id);
1162 bool perf_evlist__valid_sample_id_all(struct perf_evlist *evlist)
1164 struct perf_evsel *first = perf_evlist__first(evlist), *pos = first;
1166 evlist__for_each_continue(evlist, pos) {
1167 if (first->attr.sample_id_all != pos->attr.sample_id_all)
1174 bool perf_evlist__sample_id_all(struct perf_evlist *evlist)
1176 struct perf_evsel *first = perf_evlist__first(evlist);
1177 return first->attr.sample_id_all;
1180 void perf_evlist__set_selected(struct perf_evlist *evlist,
1181 struct perf_evsel *evsel)
1183 evlist->selected = evsel;
1186 void perf_evlist__close(struct perf_evlist *evlist)
1188 struct perf_evsel *evsel;
1189 int ncpus = cpu_map__nr(evlist->cpus);
1190 int nthreads = thread_map__nr(evlist->threads);
1193 evlist__for_each_reverse(evlist, evsel) {
1194 n = evsel->cpus ? evsel->cpus->nr : ncpus;
1195 perf_evsel__close(evsel, n, nthreads);
1199 static int perf_evlist__create_syswide_maps(struct perf_evlist *evlist)
1204 * Try reading /sys/devices/system/cpu/online to get
1207 * FIXME: -ENOMEM is the best we can do here, the cpu_map
1208 * code needs an overhaul to properly forward the
1209 * error, and we may not want to do that fallback to a
1210 * default cpu identity map :-\
1212 evlist->cpus = cpu_map__new(NULL);
1213 if (evlist->cpus == NULL)
1216 evlist->threads = thread_map__new_dummy();
1217 if (evlist->threads == NULL)
1224 cpu_map__delete(evlist->cpus);
1225 evlist->cpus = NULL;
1229 int perf_evlist__open(struct perf_evlist *evlist)
1231 struct perf_evsel *evsel;
1235 * Default: one fd per CPU, all threads, aka systemwide
1236 * as sys_perf_event_open(cpu = -1, thread = -1) is EINVAL
1238 if (evlist->threads == NULL && evlist->cpus == NULL) {
1239 err = perf_evlist__create_syswide_maps(evlist);
1244 perf_evlist__update_id_pos(evlist);
1246 evlist__for_each(evlist, evsel) {
1247 err = perf_evsel__open(evsel, evlist->cpus, evlist->threads);
1254 perf_evlist__close(evlist);
1259 int perf_evlist__prepare_workload(struct perf_evlist *evlist, struct target *target,
1260 const char *argv[], bool pipe_output,
1261 void (*exec_error)(int signo, siginfo_t *info, void *ucontext))
1263 int child_ready_pipe[2], go_pipe[2];
1266 if (pipe(child_ready_pipe) < 0) {
1267 perror("failed to create 'ready' pipe");
1271 if (pipe(go_pipe) < 0) {
1272 perror("failed to create 'go' pipe");
1273 goto out_close_ready_pipe;
1276 evlist->workload.pid = fork();
1277 if (evlist->workload.pid < 0) {
1278 perror("failed to fork");
1279 goto out_close_pipes;
1282 if (!evlist->workload.pid) {
1288 signal(SIGTERM, SIG_DFL);
1290 close(child_ready_pipe[0]);
1292 fcntl(go_pipe[0], F_SETFD, FD_CLOEXEC);
1295 * Tell the parent we're ready to go
1297 close(child_ready_pipe[1]);
1300 * Wait until the parent tells us to go.
1302 ret = read(go_pipe[0], &bf, 1);
1304 * The parent will ask for the execvp() to be performed by
1305 * writing exactly one byte, in workload.cork_fd, usually via
1306 * perf_evlist__start_workload().
1308 * For cancelling the workload without actuallin running it,
1309 * the parent will just close workload.cork_fd, without writing
1310 * anything, i.e. read will return zero and we just exit()
1315 perror("unable to read pipe");
1319 execvp(argv[0], (char **)argv);
1324 val.sival_int = errno;
1325 if (sigqueue(getppid(), SIGUSR1, val))
1333 struct sigaction act = {
1334 .sa_flags = SA_SIGINFO,
1335 .sa_sigaction = exec_error,
1337 sigaction(SIGUSR1, &act, NULL);
1340 if (target__none(target)) {
1341 if (evlist->threads == NULL) {
1342 fprintf(stderr, "FATAL: evlist->threads need to be set at this point (%s:%d).\n",
1343 __func__, __LINE__);
1344 goto out_close_pipes;
1346 evlist->threads->map[0] = evlist->workload.pid;
1349 close(child_ready_pipe[1]);
1352 * wait for child to settle
1354 if (read(child_ready_pipe[0], &bf, 1) == -1) {
1355 perror("unable to read pipe");
1356 goto out_close_pipes;
1359 fcntl(go_pipe[1], F_SETFD, FD_CLOEXEC);
1360 evlist->workload.cork_fd = go_pipe[1];
1361 close(child_ready_pipe[0]);
1367 out_close_ready_pipe:
1368 close(child_ready_pipe[0]);
1369 close(child_ready_pipe[1]);
1373 int perf_evlist__start_workload(struct perf_evlist *evlist)
1375 if (evlist->workload.cork_fd > 0) {
1379 * Remove the cork, let it rip!
1381 ret = write(evlist->workload.cork_fd, &bf, 1);
1383 perror("enable to write to pipe");
1385 close(evlist->workload.cork_fd);
1392 int perf_evlist__parse_sample(struct perf_evlist *evlist, union perf_event *event,
1393 struct perf_sample *sample)
1395 struct perf_evsel *evsel = perf_evlist__event2evsel(evlist, event);
1399 return perf_evsel__parse_sample(evsel, event, sample);
1402 size_t perf_evlist__fprintf(struct perf_evlist *evlist, FILE *fp)
1404 struct perf_evsel *evsel;
1407 evlist__for_each(evlist, evsel) {
1408 printed += fprintf(fp, "%s%s", evsel->idx ? ", " : "",
1409 perf_evsel__name(evsel));
1412 return printed + fprintf(fp, "\n");
1415 int perf_evlist__strerror_tp(struct perf_evlist *evlist __maybe_unused,
1416 int err, char *buf, size_t size)
1422 scnprintf(buf, size, "%s",
1423 "Error:\tUnable to find debugfs\n"
1424 "Hint:\tWas your kernel was compiled with debugfs support?\n"
1425 "Hint:\tIs the debugfs filesystem mounted?\n"
1426 "Hint:\tTry 'sudo mount -t debugfs nodev /sys/kernel/debug'");
1429 scnprintf(buf, size,
1430 "Error:\tNo permissions to read %s/tracing/events/raw_syscalls\n"
1431 "Hint:\tTry 'sudo mount -o remount,mode=755 %s'\n",
1432 debugfs_mountpoint, debugfs_mountpoint);
1435 scnprintf(buf, size, "%s", strerror_r(err, sbuf, sizeof(sbuf)));
1442 int perf_evlist__strerror_open(struct perf_evlist *evlist __maybe_unused,
1443 int err, char *buf, size_t size)
1446 char sbuf[STRERR_BUFSIZE], *emsg = strerror_r(err, sbuf, sizeof(sbuf));
1451 printed = scnprintf(buf, size,
1453 "Hint:\tCheck /proc/sys/kernel/perf_event_paranoid setting.", emsg);
1455 value = perf_event_paranoid();
1457 printed += scnprintf(buf + printed, size - printed, "\nHint:\t");
1460 printed += scnprintf(buf + printed, size - printed,
1461 "For your workloads it needs to be <= 1\nHint:\t");
1463 printed += scnprintf(buf + printed, size - printed,
1464 "For system wide tracing it needs to be set to -1.\n");
1466 printed += scnprintf(buf + printed, size - printed,
1467 "Hint:\tTry: 'sudo sh -c \"echo -1 > /proc/sys/kernel/perf_event_paranoid\"'\n"
1468 "Hint:\tThe current value is %d.", value);
1471 scnprintf(buf, size, "%s", emsg);
1478 void perf_evlist__to_front(struct perf_evlist *evlist,
1479 struct perf_evsel *move_evsel)
1481 struct perf_evsel *evsel, *n;
1484 if (move_evsel == perf_evlist__first(evlist))
1487 evlist__for_each_safe(evlist, n, evsel) {
1488 if (evsel->leader == move_evsel->leader)
1489 list_move_tail(&evsel->node, &move);
1492 list_splice(&move, &evlist->entries);
1495 void perf_evlist__set_tracking_event(struct perf_evlist *evlist,
1496 struct perf_evsel *tracking_evsel)
1498 struct perf_evsel *evsel;
1500 if (tracking_evsel->tracking)
1503 evlist__for_each(evlist, evsel) {
1504 if (evsel != tracking_evsel)
1505 evsel->tracking = false;
1508 tracking_evsel->tracking = true;