1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (C) 2011, Red Hat Inc, Arnaldo Carvalho de Melo <acme@redhat.com>
5 * Parts came from builtin-{top,stat,record}.c, see those files for further
13 #include "util/mmap.h"
14 #include "thread_map.h"
20 #include <internal/lib.h> // page_size
23 #include "bpf-event.h"
24 #include "util/string2.h"
30 #include "parse-events.h"
31 #include <subcmd/parse-options.h>
34 #include <sys/ioctl.h>
37 #include <linux/bitops.h>
38 #include <linux/hash.h>
39 #include <linux/log2.h>
40 #include <linux/err.h>
41 #include <linux/string.h>
42 #include <linux/zalloc.h>
43 #include <perf/evlist.h>
44 #include <perf/evsel.h>
45 #include <perf/cpumap.h>
46 #include <perf/mmap.h>
48 #include <internal/xyarray.h>
50 #ifdef LACKS_SIGQUEUE_PROTOTYPE
51 int sigqueue(pid_t pid, int sig, const union sigval value);
54 #define FD(e, x, y) (*(int *)xyarray__entry(e->core.fd, x, y))
55 #define SID(e, x, y) xyarray__entry(e->core.sample_id, x, y)
57 void evlist__init(struct evlist *evlist, struct perf_cpu_map *cpus,
58 struct perf_thread_map *threads)
60 perf_evlist__init(&evlist->core);
61 perf_evlist__set_maps(&evlist->core, cpus, threads);
62 evlist->workload.pid = -1;
63 evlist->bkw_mmap_state = BKW_MMAP_NOTREADY;
66 struct evlist *evlist__new(void)
68 struct evlist *evlist = zalloc(sizeof(*evlist));
71 evlist__init(evlist, NULL, NULL);
76 struct evlist *perf_evlist__new_default(void)
78 struct evlist *evlist = evlist__new();
80 if (evlist && perf_evlist__add_default(evlist)) {
81 evlist__delete(evlist);
88 struct evlist *perf_evlist__new_dummy(void)
90 struct evlist *evlist = evlist__new();
92 if (evlist && perf_evlist__add_dummy(evlist)) {
93 evlist__delete(evlist);
101 * perf_evlist__set_id_pos - set the positions of event ids.
102 * @evlist: selected event list
104 * Events with compatible sample types all have the same id_pos
105 * and is_pos. For convenience, put a copy on evlist.
107 void perf_evlist__set_id_pos(struct evlist *evlist)
109 struct evsel *first = evlist__first(evlist);
111 evlist->id_pos = first->id_pos;
112 evlist->is_pos = first->is_pos;
115 static void perf_evlist__update_id_pos(struct evlist *evlist)
119 evlist__for_each_entry(evlist, evsel)
120 perf_evsel__calc_id_pos(evsel);
122 perf_evlist__set_id_pos(evlist);
125 static void evlist__purge(struct evlist *evlist)
127 struct evsel *pos, *n;
129 evlist__for_each_entry_safe(evlist, n, pos) {
130 list_del_init(&pos->core.node);
135 evlist->core.nr_entries = 0;
138 void evlist__exit(struct evlist *evlist)
140 zfree(&evlist->mmap);
141 zfree(&evlist->overwrite_mmap);
142 perf_evlist__exit(&evlist->core);
145 void evlist__delete(struct evlist *evlist)
150 evlist__munmap(evlist);
151 evlist__close(evlist);
152 evlist__purge(evlist);
153 evlist__exit(evlist);
157 void evlist__add(struct evlist *evlist, struct evsel *entry)
159 entry->evlist = evlist;
160 entry->idx = evlist->core.nr_entries;
161 entry->tracking = !entry->idx;
163 perf_evlist__add(&evlist->core, &entry->core);
165 if (evlist->core.nr_entries == 1)
166 perf_evlist__set_id_pos(evlist);
169 void evlist__remove(struct evlist *evlist, struct evsel *evsel)
171 evsel->evlist = NULL;
172 perf_evlist__remove(&evlist->core, &evsel->core);
175 void perf_evlist__splice_list_tail(struct evlist *evlist,
176 struct list_head *list)
178 struct evsel *evsel, *temp;
180 __evlist__for_each_entry_safe(list, temp, evsel) {
181 list_del_init(&evsel->core.node);
182 evlist__add(evlist, evsel);
186 int __evlist__set_tracepoints_handlers(struct evlist *evlist,
187 const struct evsel_str_handler *assocs, size_t nr_assocs)
193 for (i = 0; i < nr_assocs; i++) {
194 // Adding a handler for an event not in this evlist, just ignore it.
195 evsel = perf_evlist__find_tracepoint_by_name(evlist, assocs[i].name);
200 if (evsel->handler != NULL)
202 evsel->handler = assocs[i].handler;
210 void __perf_evlist__set_leader(struct list_head *list)
212 struct evsel *evsel, *leader;
214 leader = list_entry(list->next, struct evsel, core.node);
215 evsel = list_entry(list->prev, struct evsel, core.node);
217 leader->core.nr_members = evsel->idx - leader->idx + 1;
219 __evlist__for_each_entry(list, evsel) {
220 evsel->leader = leader;
224 void perf_evlist__set_leader(struct evlist *evlist)
226 if (evlist->core.nr_entries) {
227 evlist->nr_groups = evlist->core.nr_entries > 1 ? 1 : 0;
228 __perf_evlist__set_leader(&evlist->core.entries);
232 int __perf_evlist__add_default(struct evlist *evlist, bool precise)
234 struct evsel *evsel = perf_evsel__new_cycles(precise);
239 evlist__add(evlist, evsel);
243 int perf_evlist__add_dummy(struct evlist *evlist)
245 struct perf_event_attr attr = {
246 .type = PERF_TYPE_SOFTWARE,
247 .config = PERF_COUNT_SW_DUMMY,
248 .size = sizeof(attr), /* to capture ABI version */
250 struct evsel *evsel = perf_evsel__new_idx(&attr, evlist->core.nr_entries);
255 evlist__add(evlist, evsel);
259 static int evlist__add_attrs(struct evlist *evlist,
260 struct perf_event_attr *attrs, size_t nr_attrs)
262 struct evsel *evsel, *n;
266 for (i = 0; i < nr_attrs; i++) {
267 evsel = perf_evsel__new_idx(attrs + i, evlist->core.nr_entries + i);
269 goto out_delete_partial_list;
270 list_add_tail(&evsel->core.node, &head);
273 perf_evlist__splice_list_tail(evlist, &head);
277 out_delete_partial_list:
278 __evlist__for_each_entry_safe(&head, n, evsel)
279 evsel__delete(evsel);
283 int __perf_evlist__add_default_attrs(struct evlist *evlist,
284 struct perf_event_attr *attrs, size_t nr_attrs)
288 for (i = 0; i < nr_attrs; i++)
289 event_attr_init(attrs + i);
291 return evlist__add_attrs(evlist, attrs, nr_attrs);
295 perf_evlist__find_tracepoint_by_id(struct evlist *evlist, int id)
299 evlist__for_each_entry(evlist, evsel) {
300 if (evsel->core.attr.type == PERF_TYPE_TRACEPOINT &&
301 (int)evsel->core.attr.config == id)
309 perf_evlist__find_tracepoint_by_name(struct evlist *evlist,
314 evlist__for_each_entry(evlist, evsel) {
315 if ((evsel->core.attr.type == PERF_TYPE_TRACEPOINT) &&
316 (strcmp(evsel->name, name) == 0))
323 int perf_evlist__add_newtp(struct evlist *evlist,
324 const char *sys, const char *name, void *handler)
326 struct evsel *evsel = perf_evsel__newtp(sys, name);
331 evsel->handler = handler;
332 evlist__add(evlist, evsel);
336 static int perf_evlist__nr_threads(struct evlist *evlist,
339 if (evsel->core.system_wide)
342 return perf_thread_map__nr(evlist->core.threads);
345 void evlist__disable(struct evlist *evlist)
349 evlist__for_each_entry(evlist, pos) {
350 if (pos->disabled || !perf_evsel__is_group_leader(pos) || !pos->core.fd)
355 evlist->enabled = false;
358 void evlist__enable(struct evlist *evlist)
362 evlist__for_each_entry(evlist, pos) {
363 if (!perf_evsel__is_group_leader(pos) || !pos->core.fd)
368 evlist->enabled = true;
371 void perf_evlist__toggle_enable(struct evlist *evlist)
373 (evlist->enabled ? evlist__disable : evlist__enable)(evlist);
376 static int perf_evlist__enable_event_cpu(struct evlist *evlist,
377 struct evsel *evsel, int cpu)
380 int nr_threads = perf_evlist__nr_threads(evlist, evsel);
385 for (thread = 0; thread < nr_threads; thread++) {
386 int err = ioctl(FD(evsel, cpu, thread), PERF_EVENT_IOC_ENABLE, 0);
393 static int perf_evlist__enable_event_thread(struct evlist *evlist,
398 int nr_cpus = perf_cpu_map__nr(evlist->core.cpus);
403 for (cpu = 0; cpu < nr_cpus; cpu++) {
404 int err = ioctl(FD(evsel, cpu, thread), PERF_EVENT_IOC_ENABLE, 0);
411 int perf_evlist__enable_event_idx(struct evlist *evlist,
412 struct evsel *evsel, int idx)
414 bool per_cpu_mmaps = !perf_cpu_map__empty(evlist->core.cpus);
417 return perf_evlist__enable_event_cpu(evlist, evsel, idx);
419 return perf_evlist__enable_event_thread(evlist, evsel, idx);
422 int evlist__add_pollfd(struct evlist *evlist, int fd)
424 return perf_evlist__add_pollfd(&evlist->core, fd, NULL, POLLIN);
427 int evlist__filter_pollfd(struct evlist *evlist, short revents_and_mask)
429 return perf_evlist__filter_pollfd(&evlist->core, revents_and_mask);
432 int evlist__poll(struct evlist *evlist, int timeout)
434 return perf_evlist__poll(&evlist->core, timeout);
437 struct perf_sample_id *perf_evlist__id2sid(struct evlist *evlist, u64 id)
439 struct hlist_head *head;
440 struct perf_sample_id *sid;
443 hash = hash_64(id, PERF_EVLIST__HLIST_BITS);
444 head = &evlist->core.heads[hash];
446 hlist_for_each_entry(sid, head, node)
453 struct evsel *perf_evlist__id2evsel(struct evlist *evlist, u64 id)
455 struct perf_sample_id *sid;
457 if (evlist->core.nr_entries == 1 || !id)
458 return evlist__first(evlist);
460 sid = perf_evlist__id2sid(evlist, id);
462 return container_of(sid->evsel, struct evsel, core);
464 if (!perf_evlist__sample_id_all(evlist))
465 return evlist__first(evlist);
470 struct evsel *perf_evlist__id2evsel_strict(struct evlist *evlist,
473 struct perf_sample_id *sid;
478 sid = perf_evlist__id2sid(evlist, id);
480 return container_of(sid->evsel, struct evsel, core);
485 static int perf_evlist__event2id(struct evlist *evlist,
486 union perf_event *event, u64 *id)
488 const __u64 *array = event->sample.array;
491 n = (event->header.size - sizeof(event->header)) >> 3;
493 if (event->header.type == PERF_RECORD_SAMPLE) {
494 if (evlist->id_pos >= n)
496 *id = array[evlist->id_pos];
498 if (evlist->is_pos > n)
506 struct evsel *perf_evlist__event2evsel(struct evlist *evlist,
507 union perf_event *event)
509 struct evsel *first = evlist__first(evlist);
510 struct hlist_head *head;
511 struct perf_sample_id *sid;
515 if (evlist->core.nr_entries == 1)
518 if (!first->core.attr.sample_id_all &&
519 event->header.type != PERF_RECORD_SAMPLE)
522 if (perf_evlist__event2id(evlist, event, &id))
525 /* Synthesized events have an id of zero */
529 hash = hash_64(id, PERF_EVLIST__HLIST_BITS);
530 head = &evlist->core.heads[hash];
532 hlist_for_each_entry(sid, head, node) {
534 return container_of(sid->evsel, struct evsel, core);
539 static int perf_evlist__set_paused(struct evlist *evlist, bool value)
543 if (!evlist->overwrite_mmap)
546 for (i = 0; i < evlist->core.nr_mmaps; i++) {
547 int fd = evlist->overwrite_mmap[i].core.fd;
552 err = ioctl(fd, PERF_EVENT_IOC_PAUSE_OUTPUT, value ? 1 : 0);
559 static int perf_evlist__pause(struct evlist *evlist)
561 return perf_evlist__set_paused(evlist, true);
564 static int perf_evlist__resume(struct evlist *evlist)
566 return perf_evlist__set_paused(evlist, false);
569 static void evlist__munmap_nofree(struct evlist *evlist)
574 for (i = 0; i < evlist->core.nr_mmaps; i++)
575 perf_mmap__munmap(&evlist->mmap[i].core);
577 if (evlist->overwrite_mmap)
578 for (i = 0; i < evlist->core.nr_mmaps; i++)
579 perf_mmap__munmap(&evlist->overwrite_mmap[i].core);
582 void evlist__munmap(struct evlist *evlist)
584 evlist__munmap_nofree(evlist);
585 zfree(&evlist->mmap);
586 zfree(&evlist->overwrite_mmap);
589 static void perf_mmap__unmap_cb(struct perf_mmap *map)
591 struct mmap *m = container_of(map, struct mmap, core);
596 static struct mmap *evlist__alloc_mmap(struct evlist *evlist,
602 map = zalloc(evlist->core.nr_mmaps * sizeof(struct mmap));
606 for (i = 0; i < evlist->core.nr_mmaps; i++) {
607 struct perf_mmap *prev = i ? &map[i - 1].core : NULL;
610 * When the perf_mmap() call is made we grab one refcount, plus
611 * one extra to let perf_mmap__consume() get the last
612 * events after all real references (perf_mmap__get()) are
615 * Each PERF_EVENT_IOC_SET_OUTPUT points to this mmap and
616 * thus does perf_mmap__get() on it.
618 perf_mmap__init(&map[i].core, prev, overwrite, perf_mmap__unmap_cb);
625 perf_evlist__mmap_cb_idx(struct perf_evlist *_evlist,
626 struct perf_mmap_param *_mp,
627 int idx, bool per_cpu)
629 struct evlist *evlist = container_of(_evlist, struct evlist, core);
630 struct mmap_params *mp = container_of(_mp, struct mmap_params, core);
632 auxtrace_mmap_params__set_idx(&mp->auxtrace_mp, evlist, idx, per_cpu);
635 static struct perf_mmap*
636 perf_evlist__mmap_cb_get(struct perf_evlist *_evlist, bool overwrite, int idx)
638 struct evlist *evlist = container_of(_evlist, struct evlist, core);
641 maps = overwrite ? evlist->overwrite_mmap : evlist->mmap;
644 maps = evlist__alloc_mmap(evlist, overwrite);
649 evlist->overwrite_mmap = maps;
650 if (evlist->bkw_mmap_state == BKW_MMAP_NOTREADY)
651 perf_evlist__toggle_bkw_mmap(evlist, BKW_MMAP_RUNNING);
657 return &maps[idx].core;
661 perf_evlist__mmap_cb_mmap(struct perf_mmap *_map, struct perf_mmap_param *_mp,
664 struct mmap *map = container_of(_map, struct mmap, core);
665 struct mmap_params *mp = container_of(_mp, struct mmap_params, core);
667 return mmap__mmap(map, mp, output, cpu);
670 unsigned long perf_event_mlock_kb_in_pages(void)
675 if (sysctl__read_int("kernel/perf_event_mlock_kb", &max) < 0) {
677 * Pick a once upon a time good value, i.e. things look
678 * strange since we can't read a sysctl value, but lets not
683 max -= (page_size / 1024);
686 pages = (max * 1024) / page_size;
687 if (!is_power_of_2(pages))
688 pages = rounddown_pow_of_two(pages);
693 size_t evlist__mmap_size(unsigned long pages)
695 if (pages == UINT_MAX)
696 pages = perf_event_mlock_kb_in_pages();
697 else if (!is_power_of_2(pages))
700 return (pages + 1) * page_size;
703 static long parse_pages_arg(const char *str, unsigned long min,
706 unsigned long pages, val;
707 static struct parse_tag tags[] = {
708 { .tag = 'B', .mult = 1 },
709 { .tag = 'K', .mult = 1 << 10 },
710 { .tag = 'M', .mult = 1 << 20 },
711 { .tag = 'G', .mult = 1 << 30 },
718 val = parse_tag_value(str, tags);
719 if (val != (unsigned long) -1) {
720 /* we got file size value */
721 pages = PERF_ALIGN(val, page_size) / page_size;
723 /* we got pages count value */
725 pages = strtoul(str, &eptr, 10);
730 if (pages == 0 && min == 0) {
731 /* leave number of pages at 0 */
732 } else if (!is_power_of_2(pages)) {
735 /* round pages up to next power of 2 */
736 pages = roundup_pow_of_two(pages);
740 unit_number__scnprintf(buf, sizeof(buf), pages * page_size);
741 pr_info("rounding mmap pages size to %s (%lu pages)\n",
751 int __perf_evlist__parse_mmap_pages(unsigned int *mmap_pages, const char *str)
753 unsigned long max = UINT_MAX;
756 if (max > SIZE_MAX / page_size)
757 max = SIZE_MAX / page_size;
759 pages = parse_pages_arg(str, 1, max);
761 pr_err("Invalid argument for --mmap_pages/-m\n");
769 int perf_evlist__parse_mmap_pages(const struct option *opt, const char *str,
770 int unset __maybe_unused)
772 return __perf_evlist__parse_mmap_pages(opt->value, str);
776 * evlist__mmap_ex - Create mmaps to receive events.
777 * @evlist: list of events
778 * @pages: map length in pages
779 * @overwrite: overwrite older events?
780 * @auxtrace_pages - auxtrace map length in pages
781 * @auxtrace_overwrite - overwrite older auxtrace data?
783 * If @overwrite is %false the user needs to signal event consumption using
784 * perf_mmap__write_tail(). Using evlist__mmap_read() does this
787 * Similarly, if @auxtrace_overwrite is %false the user needs to signal data
788 * consumption using auxtrace_mmap__write_tail().
790 * Return: %0 on success, negative error code otherwise.
792 int evlist__mmap_ex(struct evlist *evlist, unsigned int pages,
793 unsigned int auxtrace_pages,
794 bool auxtrace_overwrite, int nr_cblocks, int affinity, int flush,
798 * Delay setting mp.prot: set it before calling perf_mmap__mmap.
799 * Its value is decided by evsel's write_backward.
800 * So &mp should not be passed through const pointer.
802 struct mmap_params mp = {
803 .nr_cblocks = nr_cblocks,
804 .affinity = affinity,
806 .comp_level = comp_level
808 struct perf_evlist_mmap_ops ops = {
809 .idx = perf_evlist__mmap_cb_idx,
810 .get = perf_evlist__mmap_cb_get,
811 .mmap = perf_evlist__mmap_cb_mmap,
814 evlist->core.mmap_len = evlist__mmap_size(pages);
815 pr_debug("mmap size %zuB\n", evlist->core.mmap_len);
817 auxtrace_mmap_params__init(&mp.auxtrace_mp, evlist->core.mmap_len,
818 auxtrace_pages, auxtrace_overwrite);
820 return perf_evlist__mmap_ops(&evlist->core, &ops, &mp.core);
823 int evlist__mmap(struct evlist *evlist, unsigned int pages)
825 return evlist__mmap_ex(evlist, pages, 0, false, 0, PERF_AFFINITY_SYS, 1, 0);
828 int perf_evlist__create_maps(struct evlist *evlist, struct target *target)
830 bool all_threads = (target->per_thread && target->system_wide);
831 struct perf_cpu_map *cpus;
832 struct perf_thread_map *threads;
835 * If specify '-a' and '--per-thread' to perf record, perf record
836 * will override '--per-thread'. target->per_thread = false and
837 * target->system_wide = true.
839 * If specify '--per-thread' only to perf record,
840 * target->per_thread = true and target->system_wide = false.
842 * So target->per_thread && target->system_wide is false.
843 * For perf record, thread_map__new_str doesn't call
844 * thread_map__new_all_cpus. That will keep perf record's
847 * For perf stat, it allows the case that target->per_thread and
848 * target->system_wide are all true. It means to collect system-wide
849 * per-thread data. thread_map__new_str will call
850 * thread_map__new_all_cpus to enumerate all threads.
852 threads = thread_map__new_str(target->pid, target->tid, target->uid,
858 if (target__uses_dummy_map(target))
859 cpus = perf_cpu_map__dummy_new();
861 cpus = perf_cpu_map__new(target->cpu_list);
864 goto out_delete_threads;
866 evlist->core.has_user_cpus = !!target->cpu_list;
868 perf_evlist__set_maps(&evlist->core, cpus, threads);
873 perf_thread_map__put(threads);
877 void __perf_evlist__set_sample_bit(struct evlist *evlist,
878 enum perf_event_sample_format bit)
882 evlist__for_each_entry(evlist, evsel)
883 __perf_evsel__set_sample_bit(evsel, bit);
886 void __perf_evlist__reset_sample_bit(struct evlist *evlist,
887 enum perf_event_sample_format bit)
891 evlist__for_each_entry(evlist, evsel)
892 __perf_evsel__reset_sample_bit(evsel, bit);
895 int perf_evlist__apply_filters(struct evlist *evlist, struct evsel **err_evsel)
900 evlist__for_each_entry(evlist, evsel) {
901 if (evsel->filter == NULL)
905 * filters only work for tracepoint event, which doesn't have cpu limit.
906 * So evlist and evsel should always be same.
908 err = perf_evsel__apply_filter(&evsel->core, evsel->filter);
918 int perf_evlist__set_tp_filter(struct evlist *evlist, const char *filter)
926 evlist__for_each_entry(evlist, evsel) {
927 if (evsel->core.attr.type != PERF_TYPE_TRACEPOINT)
930 err = perf_evsel__set_filter(evsel, filter);
938 int perf_evlist__append_tp_filter(struct evlist *evlist, const char *filter)
946 evlist__for_each_entry(evlist, evsel) {
947 if (evsel->core.attr.type != PERF_TYPE_TRACEPOINT)
950 err = perf_evsel__append_tp_filter(evsel, filter);
958 char *asprintf__tp_filter_pids(size_t npids, pid_t *pids)
963 for (i = 0; i < npids; ++i) {
965 if (asprintf(&filter, "common_pid != %d", pids[i]) < 0)
970 if (asprintf(&tmp, "%s && common_pid != %d", filter, pids[i]) < 0)
984 int perf_evlist__set_tp_filter_pids(struct evlist *evlist, size_t npids, pid_t *pids)
986 char *filter = asprintf__tp_filter_pids(npids, pids);
987 int ret = perf_evlist__set_tp_filter(evlist, filter);
993 int perf_evlist__set_tp_filter_pid(struct evlist *evlist, pid_t pid)
995 return perf_evlist__set_tp_filter_pids(evlist, 1, &pid);
998 int perf_evlist__append_tp_filter_pids(struct evlist *evlist, size_t npids, pid_t *pids)
1000 char *filter = asprintf__tp_filter_pids(npids, pids);
1001 int ret = perf_evlist__append_tp_filter(evlist, filter);
1007 int perf_evlist__append_tp_filter_pid(struct evlist *evlist, pid_t pid)
1009 return perf_evlist__append_tp_filter_pids(evlist, 1, &pid);
1012 bool perf_evlist__valid_sample_type(struct evlist *evlist)
1016 if (evlist->core.nr_entries == 1)
1019 if (evlist->id_pos < 0 || evlist->is_pos < 0)
1022 evlist__for_each_entry(evlist, pos) {
1023 if (pos->id_pos != evlist->id_pos ||
1024 pos->is_pos != evlist->is_pos)
1031 u64 __perf_evlist__combined_sample_type(struct evlist *evlist)
1033 struct evsel *evsel;
1035 if (evlist->combined_sample_type)
1036 return evlist->combined_sample_type;
1038 evlist__for_each_entry(evlist, evsel)
1039 evlist->combined_sample_type |= evsel->core.attr.sample_type;
1041 return evlist->combined_sample_type;
1044 u64 perf_evlist__combined_sample_type(struct evlist *evlist)
1046 evlist->combined_sample_type = 0;
1047 return __perf_evlist__combined_sample_type(evlist);
1050 u64 perf_evlist__combined_branch_type(struct evlist *evlist)
1052 struct evsel *evsel;
1053 u64 branch_type = 0;
1055 evlist__for_each_entry(evlist, evsel)
1056 branch_type |= evsel->core.attr.branch_sample_type;
1060 bool perf_evlist__valid_read_format(struct evlist *evlist)
1062 struct evsel *first = evlist__first(evlist), *pos = first;
1063 u64 read_format = first->core.attr.read_format;
1064 u64 sample_type = first->core.attr.sample_type;
1066 evlist__for_each_entry(evlist, pos) {
1067 if (read_format != pos->core.attr.read_format)
1071 /* PERF_SAMPLE_READ imples PERF_FORMAT_ID. */
1072 if ((sample_type & PERF_SAMPLE_READ) &&
1073 !(read_format & PERF_FORMAT_ID)) {
1080 u16 perf_evlist__id_hdr_size(struct evlist *evlist)
1082 struct evsel *first = evlist__first(evlist);
1083 struct perf_sample *data;
1087 if (!first->core.attr.sample_id_all)
1090 sample_type = first->core.attr.sample_type;
1092 if (sample_type & PERF_SAMPLE_TID)
1093 size += sizeof(data->tid) * 2;
1095 if (sample_type & PERF_SAMPLE_TIME)
1096 size += sizeof(data->time);
1098 if (sample_type & PERF_SAMPLE_ID)
1099 size += sizeof(data->id);
1101 if (sample_type & PERF_SAMPLE_STREAM_ID)
1102 size += sizeof(data->stream_id);
1104 if (sample_type & PERF_SAMPLE_CPU)
1105 size += sizeof(data->cpu) * 2;
1107 if (sample_type & PERF_SAMPLE_IDENTIFIER)
1108 size += sizeof(data->id);
1113 bool perf_evlist__valid_sample_id_all(struct evlist *evlist)
1115 struct evsel *first = evlist__first(evlist), *pos = first;
1117 evlist__for_each_entry_continue(evlist, pos) {
1118 if (first->core.attr.sample_id_all != pos->core.attr.sample_id_all)
1125 bool perf_evlist__sample_id_all(struct evlist *evlist)
1127 struct evsel *first = evlist__first(evlist);
1128 return first->core.attr.sample_id_all;
1131 void perf_evlist__set_selected(struct evlist *evlist,
1132 struct evsel *evsel)
1134 evlist->selected = evsel;
1137 void evlist__close(struct evlist *evlist)
1139 struct evsel *evsel;
1141 evlist__for_each_entry_reverse(evlist, evsel)
1142 evsel__close(evsel);
1145 static int perf_evlist__create_syswide_maps(struct evlist *evlist)
1147 struct perf_cpu_map *cpus;
1148 struct perf_thread_map *threads;
1152 * Try reading /sys/devices/system/cpu/online to get
1155 * FIXME: -ENOMEM is the best we can do here, the cpu_map
1156 * code needs an overhaul to properly forward the
1157 * error, and we may not want to do that fallback to a
1158 * default cpu identity map :-\
1160 cpus = perf_cpu_map__new(NULL);
1164 threads = perf_thread_map__new_dummy();
1168 perf_evlist__set_maps(&evlist->core, cpus, threads);
1172 perf_cpu_map__put(cpus);
1176 int evlist__open(struct evlist *evlist)
1178 struct evsel *evsel;
1182 * Default: one fd per CPU, all threads, aka systemwide
1183 * as sys_perf_event_open(cpu = -1, thread = -1) is EINVAL
1185 if (evlist->core.threads == NULL && evlist->core.cpus == NULL) {
1186 err = perf_evlist__create_syswide_maps(evlist);
1191 perf_evlist__update_id_pos(evlist);
1193 evlist__for_each_entry(evlist, evsel) {
1194 err = evsel__open(evsel, evsel->core.cpus, evsel->core.threads);
1201 evlist__close(evlist);
1206 int perf_evlist__prepare_workload(struct evlist *evlist, struct target *target,
1207 const char *argv[], bool pipe_output,
1208 void (*exec_error)(int signo, siginfo_t *info, void *ucontext))
1210 int child_ready_pipe[2], go_pipe[2];
1213 if (pipe(child_ready_pipe) < 0) {
1214 perror("failed to create 'ready' pipe");
1218 if (pipe(go_pipe) < 0) {
1219 perror("failed to create 'go' pipe");
1220 goto out_close_ready_pipe;
1223 evlist->workload.pid = fork();
1224 if (evlist->workload.pid < 0) {
1225 perror("failed to fork");
1226 goto out_close_pipes;
1229 if (!evlist->workload.pid) {
1235 signal(SIGTERM, SIG_DFL);
1237 close(child_ready_pipe[0]);
1239 fcntl(go_pipe[0], F_SETFD, FD_CLOEXEC);
1242 * Tell the parent we're ready to go
1244 close(child_ready_pipe[1]);
1247 * Wait until the parent tells us to go.
1249 ret = read(go_pipe[0], &bf, 1);
1251 * The parent will ask for the execvp() to be performed by
1252 * writing exactly one byte, in workload.cork_fd, usually via
1253 * perf_evlist__start_workload().
1255 * For cancelling the workload without actually running it,
1256 * the parent will just close workload.cork_fd, without writing
1257 * anything, i.e. read will return zero and we just exit()
1262 perror("unable to read pipe");
1266 execvp(argv[0], (char **)argv);
1271 val.sival_int = errno;
1272 if (sigqueue(getppid(), SIGUSR1, val))
1280 struct sigaction act = {
1281 .sa_flags = SA_SIGINFO,
1282 .sa_sigaction = exec_error,
1284 sigaction(SIGUSR1, &act, NULL);
1287 if (target__none(target)) {
1288 if (evlist->core.threads == NULL) {
1289 fprintf(stderr, "FATAL: evlist->threads need to be set at this point (%s:%d).\n",
1290 __func__, __LINE__);
1291 goto out_close_pipes;
1293 perf_thread_map__set_pid(evlist->core.threads, 0, evlist->workload.pid);
1296 close(child_ready_pipe[1]);
1299 * wait for child to settle
1301 if (read(child_ready_pipe[0], &bf, 1) == -1) {
1302 perror("unable to read pipe");
1303 goto out_close_pipes;
1306 fcntl(go_pipe[1], F_SETFD, FD_CLOEXEC);
1307 evlist->workload.cork_fd = go_pipe[1];
1308 close(child_ready_pipe[0]);
1314 out_close_ready_pipe:
1315 close(child_ready_pipe[0]);
1316 close(child_ready_pipe[1]);
1320 int perf_evlist__start_workload(struct evlist *evlist)
1322 if (evlist->workload.cork_fd > 0) {
1326 * Remove the cork, let it rip!
1328 ret = write(evlist->workload.cork_fd, &bf, 1);
1330 perror("unable to write to pipe");
1332 close(evlist->workload.cork_fd);
1339 int perf_evlist__parse_sample(struct evlist *evlist, union perf_event *event,
1340 struct perf_sample *sample)
1342 struct evsel *evsel = perf_evlist__event2evsel(evlist, event);
1346 return perf_evsel__parse_sample(evsel, event, sample);
1349 int perf_evlist__parse_sample_timestamp(struct evlist *evlist,
1350 union perf_event *event,
1353 struct evsel *evsel = perf_evlist__event2evsel(evlist, event);
1357 return perf_evsel__parse_sample_timestamp(evsel, event, timestamp);
1360 int perf_evlist__strerror_open(struct evlist *evlist,
1361 int err, char *buf, size_t size)
1364 char sbuf[STRERR_BUFSIZE], *emsg = str_error_r(err, sbuf, sizeof(sbuf));
1369 printed = scnprintf(buf, size,
1371 "Hint:\tCheck /proc/sys/kernel/perf_event_paranoid setting.", emsg);
1373 value = perf_event_paranoid();
1375 printed += scnprintf(buf + printed, size - printed, "\nHint:\t");
1378 printed += scnprintf(buf + printed, size - printed,
1379 "For your workloads it needs to be <= 1\nHint:\t");
1381 printed += scnprintf(buf + printed, size - printed,
1382 "For system wide tracing it needs to be set to -1.\n");
1384 printed += scnprintf(buf + printed, size - printed,
1385 "Hint:\tTry: 'sudo sh -c \"echo -1 > /proc/sys/kernel/perf_event_paranoid\"'\n"
1386 "Hint:\tThe current value is %d.", value);
1389 struct evsel *first = evlist__first(evlist);
1392 if (sysctl__read_int("kernel/perf_event_max_sample_rate", &max_freq) < 0)
1395 if (first->core.attr.sample_freq < (u64)max_freq)
1398 printed = scnprintf(buf, size,
1400 "Hint:\tCheck /proc/sys/kernel/perf_event_max_sample_rate.\n"
1401 "Hint:\tThe current value is %d and %" PRIu64 " is being requested.",
1402 emsg, max_freq, first->core.attr.sample_freq);
1407 scnprintf(buf, size, "%s", emsg);
1414 int perf_evlist__strerror_mmap(struct evlist *evlist, int err, char *buf, size_t size)
1416 char sbuf[STRERR_BUFSIZE], *emsg = str_error_r(err, sbuf, sizeof(sbuf));
1417 int pages_attempted = evlist->core.mmap_len / 1024, pages_max_per_user, printed = 0;
1421 sysctl__read_int("kernel/perf_event_mlock_kb", &pages_max_per_user);
1422 printed += scnprintf(buf + printed, size - printed,
1424 "Hint:\tCheck /proc/sys/kernel/perf_event_mlock_kb (%d kB) setting.\n"
1425 "Hint:\tTried using %zd kB.\n",
1426 emsg, pages_max_per_user, pages_attempted);
1428 if (pages_attempted >= pages_max_per_user) {
1429 printed += scnprintf(buf + printed, size - printed,
1430 "Hint:\tTry 'sudo sh -c \"echo %d > /proc/sys/kernel/perf_event_mlock_kb\"', or\n",
1431 pages_max_per_user + pages_attempted);
1434 printed += scnprintf(buf + printed, size - printed,
1435 "Hint:\tTry using a smaller -m/--mmap-pages value.");
1438 scnprintf(buf, size, "%s", emsg);
1445 void perf_evlist__to_front(struct evlist *evlist,
1446 struct evsel *move_evsel)
1448 struct evsel *evsel, *n;
1451 if (move_evsel == evlist__first(evlist))
1454 evlist__for_each_entry_safe(evlist, n, evsel) {
1455 if (evsel->leader == move_evsel->leader)
1456 list_move_tail(&evsel->core.node, &move);
1459 list_splice(&move, &evlist->core.entries);
1462 void perf_evlist__set_tracking_event(struct evlist *evlist,
1463 struct evsel *tracking_evsel)
1465 struct evsel *evsel;
1467 if (tracking_evsel->tracking)
1470 evlist__for_each_entry(evlist, evsel) {
1471 if (evsel != tracking_evsel)
1472 evsel->tracking = false;
1475 tracking_evsel->tracking = true;
1479 perf_evlist__find_evsel_by_str(struct evlist *evlist,
1482 struct evsel *evsel;
1484 evlist__for_each_entry(evlist, evsel) {
1487 if (strcmp(str, evsel->name) == 0)
1494 void perf_evlist__toggle_bkw_mmap(struct evlist *evlist,
1495 enum bkw_mmap_state state)
1497 enum bkw_mmap_state old_state = evlist->bkw_mmap_state;
1504 if (!evlist->overwrite_mmap)
1507 switch (old_state) {
1508 case BKW_MMAP_NOTREADY: {
1509 if (state != BKW_MMAP_RUNNING)
1513 case BKW_MMAP_RUNNING: {
1514 if (state != BKW_MMAP_DATA_PENDING)
1519 case BKW_MMAP_DATA_PENDING: {
1520 if (state != BKW_MMAP_EMPTY)
1524 case BKW_MMAP_EMPTY: {
1525 if (state != BKW_MMAP_RUNNING)
1531 WARN_ONCE(1, "Shouldn't get there\n");
1534 evlist->bkw_mmap_state = state;
1538 perf_evlist__pause(evlist);
1541 perf_evlist__resume(evlist);
1552 bool perf_evlist__exclude_kernel(struct evlist *evlist)
1554 struct evsel *evsel;
1556 evlist__for_each_entry(evlist, evsel) {
1557 if (!evsel->core.attr.exclude_kernel)
1565 * Events in data file are not collect in groups, but we still want
1566 * the group display. Set the artificial group and set the leader's
1567 * forced_leader flag to notify the display code.
1569 void perf_evlist__force_leader(struct evlist *evlist)
1571 if (!evlist->nr_groups) {
1572 struct evsel *leader = evlist__first(evlist);
1574 perf_evlist__set_leader(evlist);
1575 leader->forced_leader = true;
1579 struct evsel *perf_evlist__reset_weak_group(struct evlist *evsel_list,
1580 struct evsel *evsel)
1582 struct evsel *c2, *leader;
1583 bool is_open = true;
1585 leader = evsel->leader;
1586 pr_debug("Weak group for %s/%d failed\n",
1587 leader->name, leader->core.nr_members);
1590 * for_each_group_member doesn't work here because it doesn't
1591 * include the first entry.
1593 evlist__for_each_entry(evsel_list, c2) {
1596 if (c2->leader == leader) {
1598 perf_evsel__close(&c2->core);
1600 c2->core.nr_members = 0;
1606 int perf_evlist__add_sb_event(struct evlist **evlist,
1607 struct perf_event_attr *attr,
1608 perf_evsel__sb_cb_t cb,
1611 struct evsel *evsel;
1612 bool new_evlist = (*evlist) == NULL;
1614 if (*evlist == NULL)
1615 *evlist = evlist__new();
1616 if (*evlist == NULL)
1619 if (!attr->sample_id_all) {
1620 pr_warning("enabling sample_id_all for all side band events\n");
1621 attr->sample_id_all = 1;
1624 evsel = perf_evsel__new_idx(attr, (*evlist)->core.nr_entries);
1628 evsel->side_band.cb = cb;
1629 evsel->side_band.data = data;
1630 evlist__add(*evlist, evsel);
1635 evlist__delete(*evlist);
1641 static void *perf_evlist__poll_thread(void *arg)
1643 struct evlist *evlist = arg;
1644 bool draining = false;
1647 * In order to read symbols from other namespaces perf to needs to call
1648 * setns(2). This isn't permitted if the struct_fs has multiple users.
1649 * unshare(2) the fs so that we may continue to setns into namespaces
1650 * that we're observing when, for instance, reading the build-ids at
1651 * the end of a 'perf record' session.
1656 bool got_data = false;
1658 if (evlist->thread.done)
1662 evlist__poll(evlist, 1000);
1664 for (i = 0; i < evlist->core.nr_mmaps; i++) {
1665 struct mmap *map = &evlist->mmap[i];
1666 union perf_event *event;
1668 if (perf_mmap__read_init(&map->core))
1670 while ((event = perf_mmap__read_event(&map->core)) != NULL) {
1671 struct evsel *evsel = perf_evlist__event2evsel(evlist, event);
1673 if (evsel && evsel->side_band.cb)
1674 evsel->side_band.cb(event, evsel->side_band.data);
1676 pr_warning("cannot locate proper evsel for the side band event\n");
1678 perf_mmap__consume(&map->core);
1681 perf_mmap__read_done(&map->core);
1684 if (draining && !got_data)
1690 int perf_evlist__start_sb_thread(struct evlist *evlist,
1691 struct target *target)
1693 struct evsel *counter;
1698 if (perf_evlist__create_maps(evlist, target))
1699 goto out_delete_evlist;
1701 evlist__for_each_entry(evlist, counter) {
1702 if (evsel__open(counter, evlist->core.cpus,
1703 evlist->core.threads) < 0)
1704 goto out_delete_evlist;
1707 if (evlist__mmap(evlist, UINT_MAX))
1708 goto out_delete_evlist;
1710 evlist__for_each_entry(evlist, counter) {
1711 if (evsel__enable(counter))
1712 goto out_delete_evlist;
1715 evlist->thread.done = 0;
1716 if (pthread_create(&evlist->thread.th, NULL, perf_evlist__poll_thread, evlist))
1717 goto out_delete_evlist;
1722 evlist__delete(evlist);
1727 void perf_evlist__stop_sb_thread(struct evlist *evlist)
1731 evlist->thread.done = 1;
1732 pthread_join(evlist->thread.th, NULL);
1733 evlist__delete(evlist);