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"
20 #include "parse-events.h"
21 #include <subcmd/parse-options.h>
25 #include <linux/bitops.h>
26 #include <linux/hash.h>
27 #include <linux/log2.h>
28 #include <linux/err.h>
30 static void perf_evlist__mmap_put(struct perf_evlist
*evlist
, int idx
);
31 static void __perf_evlist__munmap(struct perf_evlist
*evlist
, int idx
);
33 #define FD(e, x, y) (*(int *)xyarray__entry(e->fd, x, y))
34 #define SID(e, x, y) xyarray__entry(e->sample_id, x, y)
36 void perf_evlist__init(struct perf_evlist
*evlist
, struct cpu_map
*cpus
,
37 struct thread_map
*threads
)
41 for (i
= 0; i
< PERF_EVLIST__HLIST_SIZE
; ++i
)
42 INIT_HLIST_HEAD(&evlist
->heads
[i
]);
43 INIT_LIST_HEAD(&evlist
->entries
);
44 perf_evlist__set_maps(evlist
, cpus
, threads
);
45 fdarray__init(&evlist
->pollfd
, 64);
46 evlist
->workload
.pid
= -1;
47 evlist
->backward
= false;
50 struct perf_evlist
*perf_evlist__new(void)
52 struct perf_evlist
*evlist
= zalloc(sizeof(*evlist
));
55 perf_evlist__init(evlist
, NULL
, NULL
);
60 struct perf_evlist
*perf_evlist__new_default(void)
62 struct perf_evlist
*evlist
= perf_evlist__new();
64 if (evlist
&& perf_evlist__add_default(evlist
)) {
65 perf_evlist__delete(evlist
);
72 struct perf_evlist
*perf_evlist__new_dummy(void)
74 struct perf_evlist
*evlist
= perf_evlist__new();
76 if (evlist
&& perf_evlist__add_dummy(evlist
)) {
77 perf_evlist__delete(evlist
);
85 * perf_evlist__set_id_pos - set the positions of event ids.
86 * @evlist: selected event list
88 * Events with compatible sample types all have the same id_pos
89 * and is_pos. For convenience, put a copy on evlist.
91 void perf_evlist__set_id_pos(struct perf_evlist
*evlist
)
93 struct perf_evsel
*first
= perf_evlist__first(evlist
);
95 evlist
->id_pos
= first
->id_pos
;
96 evlist
->is_pos
= first
->is_pos
;
99 static void perf_evlist__update_id_pos(struct perf_evlist
*evlist
)
101 struct perf_evsel
*evsel
;
103 evlist__for_each_entry(evlist
, evsel
)
104 perf_evsel__calc_id_pos(evsel
);
106 perf_evlist__set_id_pos(evlist
);
109 static void perf_evlist__purge(struct perf_evlist
*evlist
)
111 struct perf_evsel
*pos
, *n
;
113 evlist__for_each_entry_safe(evlist
, n
, pos
) {
114 list_del_init(&pos
->node
);
116 perf_evsel__delete(pos
);
119 evlist
->nr_entries
= 0;
122 void perf_evlist__exit(struct perf_evlist
*evlist
)
124 zfree(&evlist
->mmap
);
125 fdarray__exit(&evlist
->pollfd
);
128 void perf_evlist__delete(struct perf_evlist
*evlist
)
133 perf_evlist__munmap(evlist
);
134 perf_evlist__close(evlist
);
135 cpu_map__put(evlist
->cpus
);
136 thread_map__put(evlist
->threads
);
138 evlist
->threads
= NULL
;
139 perf_evlist__purge(evlist
);
140 perf_evlist__exit(evlist
);
144 static void __perf_evlist__propagate_maps(struct perf_evlist
*evlist
,
145 struct perf_evsel
*evsel
)
148 * We already have cpus for evsel (via PMU sysfs) so
149 * keep it, if there's no target cpu list defined.
151 if (!evsel
->own_cpus
|| evlist
->has_user_cpus
) {
152 cpu_map__put(evsel
->cpus
);
153 evsel
->cpus
= cpu_map__get(evlist
->cpus
);
154 } else if (evsel
->cpus
!= evsel
->own_cpus
) {
155 cpu_map__put(evsel
->cpus
);
156 evsel
->cpus
= cpu_map__get(evsel
->own_cpus
);
159 thread_map__put(evsel
->threads
);
160 evsel
->threads
= thread_map__get(evlist
->threads
);
163 static void perf_evlist__propagate_maps(struct perf_evlist
*evlist
)
165 struct perf_evsel
*evsel
;
167 evlist__for_each_entry(evlist
, evsel
)
168 __perf_evlist__propagate_maps(evlist
, evsel
);
171 void perf_evlist__add(struct perf_evlist
*evlist
, struct perf_evsel
*entry
)
173 entry
->evlist
= evlist
;
174 list_add_tail(&entry
->node
, &evlist
->entries
);
175 entry
->idx
= evlist
->nr_entries
;
176 entry
->tracking
= !entry
->idx
;
178 if (!evlist
->nr_entries
++)
179 perf_evlist__set_id_pos(evlist
);
181 __perf_evlist__propagate_maps(evlist
, entry
);
184 void perf_evlist__remove(struct perf_evlist
*evlist
, struct perf_evsel
*evsel
)
186 evsel
->evlist
= NULL
;
187 list_del_init(&evsel
->node
);
188 evlist
->nr_entries
-= 1;
191 void perf_evlist__splice_list_tail(struct perf_evlist
*evlist
,
192 struct list_head
*list
)
194 struct perf_evsel
*evsel
, *temp
;
196 __evlist__for_each_entry_safe(list
, temp
, evsel
) {
197 list_del_init(&evsel
->node
);
198 perf_evlist__add(evlist
, evsel
);
202 void __perf_evlist__set_leader(struct list_head
*list
)
204 struct perf_evsel
*evsel
, *leader
;
206 leader
= list_entry(list
->next
, struct perf_evsel
, node
);
207 evsel
= list_entry(list
->prev
, struct perf_evsel
, node
);
209 leader
->nr_members
= evsel
->idx
- leader
->idx
+ 1;
211 __evlist__for_each_entry(list
, evsel
) {
212 evsel
->leader
= leader
;
216 void perf_evlist__set_leader(struct perf_evlist
*evlist
)
218 if (evlist
->nr_entries
) {
219 evlist
->nr_groups
= evlist
->nr_entries
> 1 ? 1 : 0;
220 __perf_evlist__set_leader(&evlist
->entries
);
224 void perf_event_attr__set_max_precise_ip(struct perf_event_attr
*attr
)
226 attr
->precise_ip
= 3;
228 while (attr
->precise_ip
!= 0) {
229 int fd
= sys_perf_event_open(attr
, 0, -1, -1, 0);
238 int perf_evlist__add_default(struct perf_evlist
*evlist
)
240 struct perf_event_attr attr
= {
241 .type
= PERF_TYPE_HARDWARE
,
242 .config
= PERF_COUNT_HW_CPU_CYCLES
,
244 struct perf_evsel
*evsel
;
246 event_attr_init(&attr
);
248 perf_event_attr__set_max_precise_ip(&attr
);
250 evsel
= perf_evsel__new(&attr
);
254 /* use asprintf() because free(evsel) assumes name is allocated */
255 if (asprintf(&evsel
->name
, "cycles%.*s",
256 attr
.precise_ip
? attr
.precise_ip
+ 1 : 0, ":ppp") < 0)
259 perf_evlist__add(evlist
, evsel
);
262 perf_evsel__delete(evsel
);
267 int perf_evlist__add_dummy(struct perf_evlist
*evlist
)
269 struct perf_event_attr attr
= {
270 .type
= PERF_TYPE_SOFTWARE
,
271 .config
= PERF_COUNT_SW_DUMMY
,
272 .size
= sizeof(attr
), /* to capture ABI version */
274 struct perf_evsel
*evsel
= perf_evsel__new(&attr
);
279 perf_evlist__add(evlist
, evsel
);
283 static int perf_evlist__add_attrs(struct perf_evlist
*evlist
,
284 struct perf_event_attr
*attrs
, size_t nr_attrs
)
286 struct perf_evsel
*evsel
, *n
;
290 for (i
= 0; i
< nr_attrs
; i
++) {
291 evsel
= perf_evsel__new_idx(attrs
+ i
, evlist
->nr_entries
+ i
);
293 goto out_delete_partial_list
;
294 list_add_tail(&evsel
->node
, &head
);
297 perf_evlist__splice_list_tail(evlist
, &head
);
301 out_delete_partial_list
:
302 __evlist__for_each_entry_safe(&head
, n
, evsel
)
303 perf_evsel__delete(evsel
);
307 int __perf_evlist__add_default_attrs(struct perf_evlist
*evlist
,
308 struct perf_event_attr
*attrs
, size_t nr_attrs
)
312 for (i
= 0; i
< nr_attrs
; i
++)
313 event_attr_init(attrs
+ i
);
315 return perf_evlist__add_attrs(evlist
, attrs
, nr_attrs
);
319 perf_evlist__find_tracepoint_by_id(struct perf_evlist
*evlist
, int id
)
321 struct perf_evsel
*evsel
;
323 evlist__for_each_entry(evlist
, evsel
) {
324 if (evsel
->attr
.type
== PERF_TYPE_TRACEPOINT
&&
325 (int)evsel
->attr
.config
== id
)
333 perf_evlist__find_tracepoint_by_name(struct perf_evlist
*evlist
,
336 struct perf_evsel
*evsel
;
338 evlist__for_each_entry(evlist
, evsel
) {
339 if ((evsel
->attr
.type
== PERF_TYPE_TRACEPOINT
) &&
340 (strcmp(evsel
->name
, name
) == 0))
347 int perf_evlist__add_newtp(struct perf_evlist
*evlist
,
348 const char *sys
, const char *name
, void *handler
)
350 struct perf_evsel
*evsel
= perf_evsel__newtp(sys
, name
);
355 evsel
->handler
= handler
;
356 perf_evlist__add(evlist
, evsel
);
360 static int perf_evlist__nr_threads(struct perf_evlist
*evlist
,
361 struct perf_evsel
*evsel
)
363 if (evsel
->system_wide
)
366 return thread_map__nr(evlist
->threads
);
369 void perf_evlist__disable(struct perf_evlist
*evlist
)
371 struct perf_evsel
*pos
;
373 evlist__for_each_entry(evlist
, pos
) {
374 if (!perf_evsel__is_group_leader(pos
) || !pos
->fd
)
376 perf_evsel__disable(pos
);
379 evlist
->enabled
= false;
382 void perf_evlist__enable(struct perf_evlist
*evlist
)
384 struct perf_evsel
*pos
;
386 evlist__for_each_entry(evlist
, pos
) {
387 if (!perf_evsel__is_group_leader(pos
) || !pos
->fd
)
389 perf_evsel__enable(pos
);
392 evlist
->enabled
= true;
395 void perf_evlist__toggle_enable(struct perf_evlist
*evlist
)
397 (evlist
->enabled
? perf_evlist__disable
: perf_evlist__enable
)(evlist
);
400 static int perf_evlist__enable_event_cpu(struct perf_evlist
*evlist
,
401 struct perf_evsel
*evsel
, int cpu
)
404 int nr_threads
= perf_evlist__nr_threads(evlist
, evsel
);
409 for (thread
= 0; thread
< nr_threads
; thread
++) {
410 err
= ioctl(FD(evsel
, cpu
, thread
),
411 PERF_EVENT_IOC_ENABLE
, 0);
418 static int perf_evlist__enable_event_thread(struct perf_evlist
*evlist
,
419 struct perf_evsel
*evsel
,
423 int nr_cpus
= cpu_map__nr(evlist
->cpus
);
428 for (cpu
= 0; cpu
< nr_cpus
; cpu
++) {
429 err
= ioctl(FD(evsel
, cpu
, thread
), PERF_EVENT_IOC_ENABLE
, 0);
436 int perf_evlist__enable_event_idx(struct perf_evlist
*evlist
,
437 struct perf_evsel
*evsel
, int idx
)
439 bool per_cpu_mmaps
= !cpu_map__empty(evlist
->cpus
);
442 return perf_evlist__enable_event_cpu(evlist
, evsel
, idx
);
444 return perf_evlist__enable_event_thread(evlist
, evsel
, idx
);
447 int perf_evlist__alloc_pollfd(struct perf_evlist
*evlist
)
449 int nr_cpus
= cpu_map__nr(evlist
->cpus
);
450 int nr_threads
= thread_map__nr(evlist
->threads
);
452 struct perf_evsel
*evsel
;
454 evlist__for_each_entry(evlist
, evsel
) {
455 if (evsel
->system_wide
)
458 nfds
+= nr_cpus
* nr_threads
;
461 if (fdarray__available_entries(&evlist
->pollfd
) < nfds
&&
462 fdarray__grow(&evlist
->pollfd
, nfds
) < 0)
468 static int __perf_evlist__add_pollfd(struct perf_evlist
*evlist
, int fd
, int idx
, short revent
)
470 int pos
= fdarray__add(&evlist
->pollfd
, fd
, revent
| POLLERR
| POLLHUP
);
472 * Save the idx so that when we filter out fds POLLHUP'ed we can
473 * close the associated evlist->mmap[] entry.
476 evlist
->pollfd
.priv
[pos
].idx
= idx
;
478 fcntl(fd
, F_SETFL
, O_NONBLOCK
);
484 int perf_evlist__add_pollfd(struct perf_evlist
*evlist
, int fd
)
486 return __perf_evlist__add_pollfd(evlist
, fd
, -1, POLLIN
);
489 static void perf_evlist__munmap_filtered(struct fdarray
*fda
, int fd
,
490 void *arg __maybe_unused
)
492 struct perf_evlist
*evlist
= container_of(fda
, struct perf_evlist
, pollfd
);
494 perf_evlist__mmap_put(evlist
, fda
->priv
[fd
].idx
);
497 int perf_evlist__filter_pollfd(struct perf_evlist
*evlist
, short revents_and_mask
)
499 return fdarray__filter(&evlist
->pollfd
, revents_and_mask
,
500 perf_evlist__munmap_filtered
, NULL
);
503 int perf_evlist__poll(struct perf_evlist
*evlist
, int timeout
)
505 return fdarray__poll(&evlist
->pollfd
, timeout
);
508 static void perf_evlist__id_hash(struct perf_evlist
*evlist
,
509 struct perf_evsel
*evsel
,
510 int cpu
, int thread
, u64 id
)
513 struct perf_sample_id
*sid
= SID(evsel
, cpu
, thread
);
517 hash
= hash_64(sid
->id
, PERF_EVLIST__HLIST_BITS
);
518 hlist_add_head(&sid
->node
, &evlist
->heads
[hash
]);
521 void perf_evlist__id_add(struct perf_evlist
*evlist
, struct perf_evsel
*evsel
,
522 int cpu
, int thread
, u64 id
)
524 perf_evlist__id_hash(evlist
, evsel
, cpu
, thread
, id
);
525 evsel
->id
[evsel
->ids
++] = id
;
528 int perf_evlist__id_add_fd(struct perf_evlist
*evlist
,
529 struct perf_evsel
*evsel
,
530 int cpu
, int thread
, int fd
)
532 u64 read_data
[4] = { 0, };
533 int id_idx
= 1; /* The first entry is the counter value */
537 ret
= ioctl(fd
, PERF_EVENT_IOC_ID
, &id
);
544 /* Legacy way to get event id.. All hail to old kernels! */
547 * This way does not work with group format read, so bail
550 if (perf_evlist__read_format(evlist
) & PERF_FORMAT_GROUP
)
553 if (!(evsel
->attr
.read_format
& PERF_FORMAT_ID
) ||
554 read(fd
, &read_data
, sizeof(read_data
)) == -1)
557 if (evsel
->attr
.read_format
& PERF_FORMAT_TOTAL_TIME_ENABLED
)
559 if (evsel
->attr
.read_format
& PERF_FORMAT_TOTAL_TIME_RUNNING
)
562 id
= read_data
[id_idx
];
565 perf_evlist__id_add(evlist
, evsel
, cpu
, thread
, id
);
569 static void perf_evlist__set_sid_idx(struct perf_evlist
*evlist
,
570 struct perf_evsel
*evsel
, int idx
, int cpu
,
573 struct perf_sample_id
*sid
= SID(evsel
, cpu
, thread
);
575 if (evlist
->cpus
&& cpu
>= 0)
576 sid
->cpu
= evlist
->cpus
->map
[cpu
];
579 if (!evsel
->system_wide
&& evlist
->threads
&& thread
>= 0)
580 sid
->tid
= thread_map__pid(evlist
->threads
, thread
);
585 struct perf_sample_id
*perf_evlist__id2sid(struct perf_evlist
*evlist
, u64 id
)
587 struct hlist_head
*head
;
588 struct perf_sample_id
*sid
;
591 hash
= hash_64(id
, PERF_EVLIST__HLIST_BITS
);
592 head
= &evlist
->heads
[hash
];
594 hlist_for_each_entry(sid
, head
, node
)
601 struct perf_evsel
*perf_evlist__id2evsel(struct perf_evlist
*evlist
, u64 id
)
603 struct perf_sample_id
*sid
;
605 if (evlist
->nr_entries
== 1 || !id
)
606 return perf_evlist__first(evlist
);
608 sid
= perf_evlist__id2sid(evlist
, id
);
612 if (!perf_evlist__sample_id_all(evlist
))
613 return perf_evlist__first(evlist
);
618 struct perf_evsel
*perf_evlist__id2evsel_strict(struct perf_evlist
*evlist
,
621 struct perf_sample_id
*sid
;
626 sid
= perf_evlist__id2sid(evlist
, id
);
633 static int perf_evlist__event2id(struct perf_evlist
*evlist
,
634 union perf_event
*event
, u64
*id
)
636 const u64
*array
= event
->sample
.array
;
639 n
= (event
->header
.size
- sizeof(event
->header
)) >> 3;
641 if (event
->header
.type
== PERF_RECORD_SAMPLE
) {
642 if (evlist
->id_pos
>= n
)
644 *id
= array
[evlist
->id_pos
];
646 if (evlist
->is_pos
> n
)
654 struct perf_evsel
*perf_evlist__event2evsel(struct perf_evlist
*evlist
,
655 union perf_event
*event
)
657 struct perf_evsel
*first
= perf_evlist__first(evlist
);
658 struct hlist_head
*head
;
659 struct perf_sample_id
*sid
;
663 if (evlist
->nr_entries
== 1)
666 if (!first
->attr
.sample_id_all
&&
667 event
->header
.type
!= PERF_RECORD_SAMPLE
)
670 if (perf_evlist__event2id(evlist
, event
, &id
))
673 /* Synthesized events have an id of zero */
677 hash
= hash_64(id
, PERF_EVLIST__HLIST_BITS
);
678 head
= &evlist
->heads
[hash
];
680 hlist_for_each_entry(sid
, head
, node
) {
687 static int perf_evlist__set_paused(struct perf_evlist
*evlist
, bool value
)
691 for (i
= 0; i
< evlist
->nr_mmaps
; i
++) {
692 int fd
= evlist
->mmap
[i
].fd
;
697 err
= ioctl(fd
, PERF_EVENT_IOC_PAUSE_OUTPUT
, value
? 1 : 0);
704 int perf_evlist__pause(struct perf_evlist
*evlist
)
706 return perf_evlist__set_paused(evlist
, true);
709 int perf_evlist__resume(struct perf_evlist
*evlist
)
711 return perf_evlist__set_paused(evlist
, false);
714 /* When check_messup is true, 'end' must points to a good entry */
715 static union perf_event
*
716 perf_mmap__read(struct perf_mmap
*md
, bool check_messup
, u64 start
,
719 unsigned char *data
= md
->base
+ page_size
;
720 union perf_event
*event
= NULL
;
721 int diff
= end
- start
;
725 * If we're further behind than half the buffer, there's a chance
726 * the writer will bite our tail and mess up the samples under us.
728 * If we somehow ended up ahead of the 'end', we got messed up.
730 * In either case, truncate and restart at 'end'.
732 if (diff
> md
->mask
/ 2 || diff
< 0) {
733 fprintf(stderr
, "WARNING: failed to keep up with mmap data.\n");
736 * 'end' points to a known good entry, start there.
743 if (diff
>= (int)sizeof(event
->header
)) {
746 event
= (union perf_event
*)&data
[start
& md
->mask
];
747 size
= event
->header
.size
;
749 if (size
< sizeof(event
->header
) || diff
< (int)size
) {
755 * Event straddles the mmap boundary -- header should always
756 * be inside due to u64 alignment of output.
758 if ((start
& md
->mask
) + size
!= ((start
+ size
) & md
->mask
)) {
759 unsigned int offset
= start
;
760 unsigned int len
= min(sizeof(*event
), size
), cpy
;
761 void *dst
= md
->event_copy
;
764 cpy
= min(md
->mask
+ 1 - (offset
& md
->mask
), len
);
765 memcpy(dst
, &data
[offset
& md
->mask
], cpy
);
771 event
= (union perf_event
*) md
->event_copy
;
784 union perf_event
*perf_evlist__mmap_read_forward(struct perf_evlist
*evlist
, int idx
)
786 struct perf_mmap
*md
= &evlist
->mmap
[idx
];
791 * Check if event was unmapped due to a POLLHUP/POLLERR.
793 if (!atomic_read(&md
->refcnt
))
796 head
= perf_mmap__read_head(md
);
798 return perf_mmap__read(md
, evlist
->overwrite
, old
, head
, &md
->prev
);
802 perf_evlist__mmap_read_backward(struct perf_evlist
*evlist
, int idx
)
804 struct perf_mmap
*md
= &evlist
->mmap
[idx
];
806 u64 start
= md
->prev
;
809 * Check if event was unmapped due to a POLLHUP/POLLERR.
811 if (!atomic_read(&md
->refcnt
))
814 head
= perf_mmap__read_head(md
);
819 * 'head' pointer starts from 0. Kernel minus sizeof(record) form
820 * it each time when kernel writes to it, so in fact 'head' is
821 * negative. 'end' pointer is made manually by adding the size of
822 * the ring buffer to 'head' pointer, means the validate data can
823 * read is the whole ring buffer. If 'end' is positive, the ring
824 * buffer has not fully filled, so we must adjust 'end' to 0.
826 * However, since both 'head' and 'end' is unsigned, we can't
827 * simply compare 'end' against 0. Here we compare '-head' and
828 * the size of the ring buffer, where -head is the number of bytes
829 * kernel write to the ring buffer.
831 if (-head
< (u64
)(md
->mask
+ 1))
834 end
= head
+ md
->mask
+ 1;
836 return perf_mmap__read(md
, false, start
, end
, &md
->prev
);
839 union perf_event
*perf_evlist__mmap_read(struct perf_evlist
*evlist
, int idx
)
841 if (!evlist
->backward
)
842 return perf_evlist__mmap_read_forward(evlist
, idx
);
843 return perf_evlist__mmap_read_backward(evlist
, idx
);
846 void perf_evlist__mmap_read_catchup(struct perf_evlist
*evlist
, int idx
)
848 struct perf_mmap
*md
= &evlist
->mmap
[idx
];
851 if (!atomic_read(&md
->refcnt
))
854 head
= perf_mmap__read_head(md
);
858 static bool perf_mmap__empty(struct perf_mmap
*md
)
860 return perf_mmap__read_head(md
) == md
->prev
&& !md
->auxtrace_mmap
.base
;
863 static void perf_evlist__mmap_get(struct perf_evlist
*evlist
, int idx
)
865 atomic_inc(&evlist
->mmap
[idx
].refcnt
);
868 static void perf_evlist__mmap_put(struct perf_evlist
*evlist
, int idx
)
870 struct perf_mmap
*md
= &evlist
->mmap
[idx
];
872 BUG_ON(md
->base
&& atomic_read(&md
->refcnt
) == 0);
874 if (atomic_dec_and_test(&md
->refcnt
))
875 __perf_evlist__munmap(evlist
, idx
);
878 void perf_evlist__mmap_consume(struct perf_evlist
*evlist
, int idx
)
880 struct perf_mmap
*md
= &evlist
->mmap
[idx
];
882 if (!evlist
->overwrite
) {
885 perf_mmap__write_tail(md
, old
);
888 if (atomic_read(&md
->refcnt
) == 1 && perf_mmap__empty(md
))
889 perf_evlist__mmap_put(evlist
, idx
);
892 int __weak
auxtrace_mmap__mmap(struct auxtrace_mmap
*mm __maybe_unused
,
893 struct auxtrace_mmap_params
*mp __maybe_unused
,
894 void *userpg __maybe_unused
,
895 int fd __maybe_unused
)
900 void __weak
auxtrace_mmap__munmap(struct auxtrace_mmap
*mm __maybe_unused
)
904 void __weak
auxtrace_mmap_params__init(
905 struct auxtrace_mmap_params
*mp __maybe_unused
,
906 off_t auxtrace_offset __maybe_unused
,
907 unsigned int auxtrace_pages __maybe_unused
,
908 bool auxtrace_overwrite __maybe_unused
)
912 void __weak
auxtrace_mmap_params__set_idx(
913 struct auxtrace_mmap_params
*mp __maybe_unused
,
914 struct perf_evlist
*evlist __maybe_unused
,
915 int idx __maybe_unused
,
916 bool per_cpu __maybe_unused
)
920 static void __perf_evlist__munmap(struct perf_evlist
*evlist
, int idx
)
922 if (evlist
->mmap
[idx
].base
!= NULL
) {
923 munmap(evlist
->mmap
[idx
].base
, evlist
->mmap_len
);
924 evlist
->mmap
[idx
].base
= NULL
;
925 evlist
->mmap
[idx
].fd
= -1;
926 atomic_set(&evlist
->mmap
[idx
].refcnt
, 0);
928 auxtrace_mmap__munmap(&evlist
->mmap
[idx
].auxtrace_mmap
);
931 void perf_evlist__munmap(struct perf_evlist
*evlist
)
935 if (evlist
->mmap
== NULL
)
938 for (i
= 0; i
< evlist
->nr_mmaps
; i
++)
939 __perf_evlist__munmap(evlist
, i
);
941 zfree(&evlist
->mmap
);
944 static int perf_evlist__alloc_mmap(struct perf_evlist
*evlist
)
948 evlist
->nr_mmaps
= cpu_map__nr(evlist
->cpus
);
949 if (cpu_map__empty(evlist
->cpus
))
950 evlist
->nr_mmaps
= thread_map__nr(evlist
->threads
);
951 evlist
->mmap
= zalloc(evlist
->nr_mmaps
* sizeof(struct perf_mmap
));
955 for (i
= 0; i
< evlist
->nr_mmaps
; i
++)
956 evlist
->mmap
[i
].fd
= -1;
963 struct auxtrace_mmap_params auxtrace_mp
;
966 static int __perf_evlist__mmap(struct perf_evlist
*evlist
, int idx
,
967 struct mmap_params
*mp
, int fd
)
970 * The last one will be done at perf_evlist__mmap_consume(), so that we
971 * make sure we don't prevent tools from consuming every last event in
974 * I.e. we can get the POLLHUP meaning that the fd doesn't exist
975 * anymore, but the last events for it are still in the ring buffer,
976 * waiting to be consumed.
978 * Tools can chose to ignore this at their own discretion, but the
979 * evlist layer can't just drop it when filtering events in
980 * perf_evlist__filter_pollfd().
982 atomic_set(&evlist
->mmap
[idx
].refcnt
, 2);
983 evlist
->mmap
[idx
].prev
= 0;
984 evlist
->mmap
[idx
].mask
= mp
->mask
;
985 evlist
->mmap
[idx
].base
= mmap(NULL
, evlist
->mmap_len
, mp
->prot
,
987 if (evlist
->mmap
[idx
].base
== MAP_FAILED
) {
988 pr_debug2("failed to mmap perf event ring buffer, error %d\n",
990 evlist
->mmap
[idx
].base
= NULL
;
993 evlist
->mmap
[idx
].fd
= fd
;
995 if (auxtrace_mmap__mmap(&evlist
->mmap
[idx
].auxtrace_mmap
,
996 &mp
->auxtrace_mp
, evlist
->mmap
[idx
].base
, fd
))
1003 perf_evlist__should_poll(struct perf_evlist
*evlist __maybe_unused
,
1004 struct perf_evsel
*evsel
)
1006 if (evsel
->attr
.write_backward
)
1011 static int perf_evlist__mmap_per_evsel(struct perf_evlist
*evlist
, int idx
,
1012 struct mmap_params
*mp
, int cpu
,
1013 int thread
, int *output
)
1015 struct perf_evsel
*evsel
;
1018 evlist__for_each_entry(evlist
, evsel
) {
1021 if (!!evsel
->attr
.write_backward
!= (evlist
->overwrite
&& evlist
->backward
))
1024 if (evsel
->system_wide
&& thread
)
1027 fd
= FD(evsel
, cpu
, thread
);
1029 if (*output
== -1) {
1031 if (__perf_evlist__mmap(evlist
, idx
, mp
, *output
) < 0)
1034 if (ioctl(fd
, PERF_EVENT_IOC_SET_OUTPUT
, *output
) != 0)
1037 perf_evlist__mmap_get(evlist
, idx
);
1040 revent
= perf_evlist__should_poll(evlist
, evsel
) ? POLLIN
: 0;
1043 * The system_wide flag causes a selected event to be opened
1044 * always without a pid. Consequently it will never get a
1045 * POLLHUP, but it is used for tracking in combination with
1046 * other events, so it should not need to be polled anyway.
1047 * Therefore don't add it for polling.
1049 if (!evsel
->system_wide
&&
1050 __perf_evlist__add_pollfd(evlist
, fd
, idx
, revent
) < 0) {
1051 perf_evlist__mmap_put(evlist
, idx
);
1055 if (evsel
->attr
.read_format
& PERF_FORMAT_ID
) {
1056 if (perf_evlist__id_add_fd(evlist
, evsel
, cpu
, thread
,
1059 perf_evlist__set_sid_idx(evlist
, evsel
, idx
, cpu
,
1067 static int perf_evlist__mmap_per_cpu(struct perf_evlist
*evlist
,
1068 struct mmap_params
*mp
)
1071 int nr_cpus
= cpu_map__nr(evlist
->cpus
);
1072 int nr_threads
= thread_map__nr(evlist
->threads
);
1074 pr_debug2("perf event ring buffer mmapped per cpu\n");
1075 for (cpu
= 0; cpu
< nr_cpus
; cpu
++) {
1078 auxtrace_mmap_params__set_idx(&mp
->auxtrace_mp
, evlist
, cpu
,
1081 for (thread
= 0; thread
< nr_threads
; thread
++) {
1082 if (perf_evlist__mmap_per_evsel(evlist
, cpu
, mp
, cpu
,
1091 for (cpu
= 0; cpu
< nr_cpus
; cpu
++)
1092 __perf_evlist__munmap(evlist
, cpu
);
1096 static int perf_evlist__mmap_per_thread(struct perf_evlist
*evlist
,
1097 struct mmap_params
*mp
)
1100 int nr_threads
= thread_map__nr(evlist
->threads
);
1102 pr_debug2("perf event ring buffer mmapped per thread\n");
1103 for (thread
= 0; thread
< nr_threads
; thread
++) {
1106 auxtrace_mmap_params__set_idx(&mp
->auxtrace_mp
, evlist
, thread
,
1109 if (perf_evlist__mmap_per_evsel(evlist
, thread
, mp
, 0, thread
,
1117 for (thread
= 0; thread
< nr_threads
; thread
++)
1118 __perf_evlist__munmap(evlist
, thread
);
1122 unsigned long perf_event_mlock_kb_in_pages(void)
1124 unsigned long pages
;
1127 if (sysctl__read_int("kernel/perf_event_mlock_kb", &max
) < 0) {
1129 * Pick a once upon a time good value, i.e. things look
1130 * strange since we can't read a sysctl value, but lets not
1135 max
-= (page_size
/ 1024);
1138 pages
= (max
* 1024) / page_size
;
1139 if (!is_power_of_2(pages
))
1140 pages
= rounddown_pow_of_two(pages
);
1145 static size_t perf_evlist__mmap_size(unsigned long pages
)
1147 if (pages
== UINT_MAX
)
1148 pages
= perf_event_mlock_kb_in_pages();
1149 else if (!is_power_of_2(pages
))
1152 return (pages
+ 1) * page_size
;
1155 static long parse_pages_arg(const char *str
, unsigned long min
,
1158 unsigned long pages
, val
;
1159 static struct parse_tag tags
[] = {
1160 { .tag
= 'B', .mult
= 1 },
1161 { .tag
= 'K', .mult
= 1 << 10 },
1162 { .tag
= 'M', .mult
= 1 << 20 },
1163 { .tag
= 'G', .mult
= 1 << 30 },
1170 val
= parse_tag_value(str
, tags
);
1171 if (val
!= (unsigned long) -1) {
1172 /* we got file size value */
1173 pages
= PERF_ALIGN(val
, page_size
) / page_size
;
1175 /* we got pages count value */
1177 pages
= strtoul(str
, &eptr
, 10);
1182 if (pages
== 0 && min
== 0) {
1183 /* leave number of pages at 0 */
1184 } else if (!is_power_of_2(pages
)) {
1185 /* round pages up to next power of 2 */
1186 pages
= roundup_pow_of_two(pages
);
1189 pr_info("rounding mmap pages size to %lu bytes (%lu pages)\n",
1190 pages
* page_size
, pages
);
1199 int __perf_evlist__parse_mmap_pages(unsigned int *mmap_pages
, const char *str
)
1201 unsigned long max
= UINT_MAX
;
1204 if (max
> SIZE_MAX
/ page_size
)
1205 max
= SIZE_MAX
/ page_size
;
1207 pages
= parse_pages_arg(str
, 1, max
);
1209 pr_err("Invalid argument for --mmap_pages/-m\n");
1213 *mmap_pages
= pages
;
1217 int perf_evlist__parse_mmap_pages(const struct option
*opt
, const char *str
,
1218 int unset __maybe_unused
)
1220 return __perf_evlist__parse_mmap_pages(opt
->value
, str
);
1224 * perf_evlist__mmap_ex - Create mmaps to receive events.
1225 * @evlist: list of events
1226 * @pages: map length in pages
1227 * @overwrite: overwrite older events?
1228 * @auxtrace_pages - auxtrace map length in pages
1229 * @auxtrace_overwrite - overwrite older auxtrace data?
1231 * If @overwrite is %false the user needs to signal event consumption using
1232 * perf_mmap__write_tail(). Using perf_evlist__mmap_read() does this
1235 * Similarly, if @auxtrace_overwrite is %false the user needs to signal data
1236 * consumption using auxtrace_mmap__write_tail().
1238 * Return: %0 on success, negative error code otherwise.
1240 int perf_evlist__mmap_ex(struct perf_evlist
*evlist
, unsigned int pages
,
1241 bool overwrite
, unsigned int auxtrace_pages
,
1242 bool auxtrace_overwrite
)
1244 struct perf_evsel
*evsel
;
1245 const struct cpu_map
*cpus
= evlist
->cpus
;
1246 const struct thread_map
*threads
= evlist
->threads
;
1247 struct mmap_params mp
= {
1248 .prot
= PROT_READ
| (overwrite
? 0 : PROT_WRITE
),
1251 if (evlist
->mmap
== NULL
&& perf_evlist__alloc_mmap(evlist
) < 0)
1254 if (evlist
->pollfd
.entries
== NULL
&& perf_evlist__alloc_pollfd(evlist
) < 0)
1257 evlist
->overwrite
= overwrite
;
1258 evlist
->mmap_len
= perf_evlist__mmap_size(pages
);
1259 pr_debug("mmap size %zuB\n", evlist
->mmap_len
);
1260 mp
.mask
= evlist
->mmap_len
- page_size
- 1;
1262 auxtrace_mmap_params__init(&mp
.auxtrace_mp
, evlist
->mmap_len
,
1263 auxtrace_pages
, auxtrace_overwrite
);
1265 evlist__for_each_entry(evlist
, evsel
) {
1266 if ((evsel
->attr
.read_format
& PERF_FORMAT_ID
) &&
1267 evsel
->sample_id
== NULL
&&
1268 perf_evsel__alloc_id(evsel
, cpu_map__nr(cpus
), threads
->nr
) < 0)
1272 if (cpu_map__empty(cpus
))
1273 return perf_evlist__mmap_per_thread(evlist
, &mp
);
1275 return perf_evlist__mmap_per_cpu(evlist
, &mp
);
1278 int perf_evlist__mmap(struct perf_evlist
*evlist
, unsigned int pages
,
1281 return perf_evlist__mmap_ex(evlist
, pages
, overwrite
, 0, false);
1284 int perf_evlist__create_maps(struct perf_evlist
*evlist
, struct target
*target
)
1286 struct cpu_map
*cpus
;
1287 struct thread_map
*threads
;
1289 threads
= thread_map__new_str(target
->pid
, target
->tid
, target
->uid
);
1294 if (target__uses_dummy_map(target
))
1295 cpus
= cpu_map__dummy_new();
1297 cpus
= cpu_map__new(target
->cpu_list
);
1300 goto out_delete_threads
;
1302 evlist
->has_user_cpus
= !!target
->cpu_list
;
1304 perf_evlist__set_maps(evlist
, cpus
, threads
);
1309 thread_map__put(threads
);
1313 void perf_evlist__set_maps(struct perf_evlist
*evlist
, struct cpu_map
*cpus
,
1314 struct thread_map
*threads
)
1317 * Allow for the possibility that one or another of the maps isn't being
1318 * changed i.e. don't put it. Note we are assuming the maps that are
1319 * being applied are brand new and evlist is taking ownership of the
1320 * original reference count of 1. If that is not the case it is up to
1321 * the caller to increase the reference count.
1323 if (cpus
!= evlist
->cpus
) {
1324 cpu_map__put(evlist
->cpus
);
1325 evlist
->cpus
= cpu_map__get(cpus
);
1328 if (threads
!= evlist
->threads
) {
1329 thread_map__put(evlist
->threads
);
1330 evlist
->threads
= thread_map__get(threads
);
1333 perf_evlist__propagate_maps(evlist
);
1336 void __perf_evlist__set_sample_bit(struct perf_evlist
*evlist
,
1337 enum perf_event_sample_format bit
)
1339 struct perf_evsel
*evsel
;
1341 evlist__for_each_entry(evlist
, evsel
)
1342 __perf_evsel__set_sample_bit(evsel
, bit
);
1345 void __perf_evlist__reset_sample_bit(struct perf_evlist
*evlist
,
1346 enum perf_event_sample_format bit
)
1348 struct perf_evsel
*evsel
;
1350 evlist__for_each_entry(evlist
, evsel
)
1351 __perf_evsel__reset_sample_bit(evsel
, bit
);
1354 int perf_evlist__apply_filters(struct perf_evlist
*evlist
, struct perf_evsel
**err_evsel
)
1356 struct perf_evsel
*evsel
;
1358 const int ncpus
= cpu_map__nr(evlist
->cpus
),
1359 nthreads
= thread_map__nr(evlist
->threads
);
1361 evlist__for_each_entry(evlist
, evsel
) {
1362 if (evsel
->filter
== NULL
)
1366 * filters only work for tracepoint event, which doesn't have cpu limit.
1367 * So evlist and evsel should always be same.
1369 err
= perf_evsel__apply_filter(evsel
, ncpus
, nthreads
, evsel
->filter
);
1379 int perf_evlist__set_filter(struct perf_evlist
*evlist
, const char *filter
)
1381 struct perf_evsel
*evsel
;
1384 evlist__for_each_entry(evlist
, evsel
) {
1385 if (evsel
->attr
.type
!= PERF_TYPE_TRACEPOINT
)
1388 err
= perf_evsel__set_filter(evsel
, filter
);
1396 int perf_evlist__set_filter_pids(struct perf_evlist
*evlist
, size_t npids
, pid_t
*pids
)
1402 for (i
= 0; i
< npids
; ++i
) {
1404 if (asprintf(&filter
, "common_pid != %d", pids
[i
]) < 0)
1409 if (asprintf(&tmp
, "%s && common_pid != %d", filter
, pids
[i
]) < 0)
1417 ret
= perf_evlist__set_filter(evlist
, filter
);
1423 int perf_evlist__set_filter_pid(struct perf_evlist
*evlist
, pid_t pid
)
1425 return perf_evlist__set_filter_pids(evlist
, 1, &pid
);
1428 bool perf_evlist__valid_sample_type(struct perf_evlist
*evlist
)
1430 struct perf_evsel
*pos
;
1432 if (evlist
->nr_entries
== 1)
1435 if (evlist
->id_pos
< 0 || evlist
->is_pos
< 0)
1438 evlist__for_each_entry(evlist
, pos
) {
1439 if (pos
->id_pos
!= evlist
->id_pos
||
1440 pos
->is_pos
!= evlist
->is_pos
)
1447 u64
__perf_evlist__combined_sample_type(struct perf_evlist
*evlist
)
1449 struct perf_evsel
*evsel
;
1451 if (evlist
->combined_sample_type
)
1452 return evlist
->combined_sample_type
;
1454 evlist__for_each_entry(evlist
, evsel
)
1455 evlist
->combined_sample_type
|= evsel
->attr
.sample_type
;
1457 return evlist
->combined_sample_type
;
1460 u64
perf_evlist__combined_sample_type(struct perf_evlist
*evlist
)
1462 evlist
->combined_sample_type
= 0;
1463 return __perf_evlist__combined_sample_type(evlist
);
1466 u64
perf_evlist__combined_branch_type(struct perf_evlist
*evlist
)
1468 struct perf_evsel
*evsel
;
1469 u64 branch_type
= 0;
1471 evlist__for_each_entry(evlist
, evsel
)
1472 branch_type
|= evsel
->attr
.branch_sample_type
;
1476 bool perf_evlist__valid_read_format(struct perf_evlist
*evlist
)
1478 struct perf_evsel
*first
= perf_evlist__first(evlist
), *pos
= first
;
1479 u64 read_format
= first
->attr
.read_format
;
1480 u64 sample_type
= first
->attr
.sample_type
;
1482 evlist__for_each_entry(evlist
, pos
) {
1483 if (read_format
!= pos
->attr
.read_format
)
1487 /* PERF_SAMPLE_READ imples PERF_FORMAT_ID. */
1488 if ((sample_type
& PERF_SAMPLE_READ
) &&
1489 !(read_format
& PERF_FORMAT_ID
)) {
1496 u64
perf_evlist__read_format(struct perf_evlist
*evlist
)
1498 struct perf_evsel
*first
= perf_evlist__first(evlist
);
1499 return first
->attr
.read_format
;
1502 u16
perf_evlist__id_hdr_size(struct perf_evlist
*evlist
)
1504 struct perf_evsel
*first
= perf_evlist__first(evlist
);
1505 struct perf_sample
*data
;
1509 if (!first
->attr
.sample_id_all
)
1512 sample_type
= first
->attr
.sample_type
;
1514 if (sample_type
& PERF_SAMPLE_TID
)
1515 size
+= sizeof(data
->tid
) * 2;
1517 if (sample_type
& PERF_SAMPLE_TIME
)
1518 size
+= sizeof(data
->time
);
1520 if (sample_type
& PERF_SAMPLE_ID
)
1521 size
+= sizeof(data
->id
);
1523 if (sample_type
& PERF_SAMPLE_STREAM_ID
)
1524 size
+= sizeof(data
->stream_id
);
1526 if (sample_type
& PERF_SAMPLE_CPU
)
1527 size
+= sizeof(data
->cpu
) * 2;
1529 if (sample_type
& PERF_SAMPLE_IDENTIFIER
)
1530 size
+= sizeof(data
->id
);
1535 bool perf_evlist__valid_sample_id_all(struct perf_evlist
*evlist
)
1537 struct perf_evsel
*first
= perf_evlist__first(evlist
), *pos
= first
;
1539 evlist__for_each_entry_continue(evlist
, pos
) {
1540 if (first
->attr
.sample_id_all
!= pos
->attr
.sample_id_all
)
1547 bool perf_evlist__sample_id_all(struct perf_evlist
*evlist
)
1549 struct perf_evsel
*first
= perf_evlist__first(evlist
);
1550 return first
->attr
.sample_id_all
;
1553 void perf_evlist__set_selected(struct perf_evlist
*evlist
,
1554 struct perf_evsel
*evsel
)
1556 evlist
->selected
= evsel
;
1559 void perf_evlist__close(struct perf_evlist
*evlist
)
1561 struct perf_evsel
*evsel
;
1562 int ncpus
= cpu_map__nr(evlist
->cpus
);
1563 int nthreads
= thread_map__nr(evlist
->threads
);
1566 evlist__for_each_entry_reverse(evlist
, evsel
) {
1567 n
= evsel
->cpus
? evsel
->cpus
->nr
: ncpus
;
1568 perf_evsel__close(evsel
, n
, nthreads
);
1572 static int perf_evlist__create_syswide_maps(struct perf_evlist
*evlist
)
1574 struct cpu_map
*cpus
;
1575 struct thread_map
*threads
;
1579 * Try reading /sys/devices/system/cpu/online to get
1582 * FIXME: -ENOMEM is the best we can do here, the cpu_map
1583 * code needs an overhaul to properly forward the
1584 * error, and we may not want to do that fallback to a
1585 * default cpu identity map :-\
1587 cpus
= cpu_map__new(NULL
);
1591 threads
= thread_map__new_dummy();
1595 perf_evlist__set_maps(evlist
, cpus
, threads
);
1603 int perf_evlist__open(struct perf_evlist
*evlist
)
1605 struct perf_evsel
*evsel
;
1609 * Default: one fd per CPU, all threads, aka systemwide
1610 * as sys_perf_event_open(cpu = -1, thread = -1) is EINVAL
1612 if (evlist
->threads
== NULL
&& evlist
->cpus
== NULL
) {
1613 err
= perf_evlist__create_syswide_maps(evlist
);
1618 perf_evlist__update_id_pos(evlist
);
1620 evlist__for_each_entry(evlist
, evsel
) {
1621 err
= perf_evsel__open(evsel
, evsel
->cpus
, evsel
->threads
);
1628 perf_evlist__close(evlist
);
1633 int perf_evlist__prepare_workload(struct perf_evlist
*evlist
, struct target
*target
,
1634 const char *argv
[], bool pipe_output
,
1635 void (*exec_error
)(int signo
, siginfo_t
*info
, void *ucontext
))
1637 int child_ready_pipe
[2], go_pipe
[2];
1640 if (pipe(child_ready_pipe
) < 0) {
1641 perror("failed to create 'ready' pipe");
1645 if (pipe(go_pipe
) < 0) {
1646 perror("failed to create 'go' pipe");
1647 goto out_close_ready_pipe
;
1650 evlist
->workload
.pid
= fork();
1651 if (evlist
->workload
.pid
< 0) {
1652 perror("failed to fork");
1653 goto out_close_pipes
;
1656 if (!evlist
->workload
.pid
) {
1662 signal(SIGTERM
, SIG_DFL
);
1664 close(child_ready_pipe
[0]);
1666 fcntl(go_pipe
[0], F_SETFD
, FD_CLOEXEC
);
1669 * Tell the parent we're ready to go
1671 close(child_ready_pipe
[1]);
1674 * Wait until the parent tells us to go.
1676 ret
= read(go_pipe
[0], &bf
, 1);
1678 * The parent will ask for the execvp() to be performed by
1679 * writing exactly one byte, in workload.cork_fd, usually via
1680 * perf_evlist__start_workload().
1682 * For cancelling the workload without actually running it,
1683 * the parent will just close workload.cork_fd, without writing
1684 * anything, i.e. read will return zero and we just exit()
1689 perror("unable to read pipe");
1693 execvp(argv
[0], (char **)argv
);
1698 val
.sival_int
= errno
;
1699 if (sigqueue(getppid(), SIGUSR1
, val
))
1707 struct sigaction act
= {
1708 .sa_flags
= SA_SIGINFO
,
1709 .sa_sigaction
= exec_error
,
1711 sigaction(SIGUSR1
, &act
, NULL
);
1714 if (target__none(target
)) {
1715 if (evlist
->threads
== NULL
) {
1716 fprintf(stderr
, "FATAL: evlist->threads need to be set at this point (%s:%d).\n",
1717 __func__
, __LINE__
);
1718 goto out_close_pipes
;
1720 thread_map__set_pid(evlist
->threads
, 0, evlist
->workload
.pid
);
1723 close(child_ready_pipe
[1]);
1726 * wait for child to settle
1728 if (read(child_ready_pipe
[0], &bf
, 1) == -1) {
1729 perror("unable to read pipe");
1730 goto out_close_pipes
;
1733 fcntl(go_pipe
[1], F_SETFD
, FD_CLOEXEC
);
1734 evlist
->workload
.cork_fd
= go_pipe
[1];
1735 close(child_ready_pipe
[0]);
1741 out_close_ready_pipe
:
1742 close(child_ready_pipe
[0]);
1743 close(child_ready_pipe
[1]);
1747 int perf_evlist__start_workload(struct perf_evlist
*evlist
)
1749 if (evlist
->workload
.cork_fd
> 0) {
1753 * Remove the cork, let it rip!
1755 ret
= write(evlist
->workload
.cork_fd
, &bf
, 1);
1757 perror("enable to write to pipe");
1759 close(evlist
->workload
.cork_fd
);
1766 int perf_evlist__parse_sample(struct perf_evlist
*evlist
, union perf_event
*event
,
1767 struct perf_sample
*sample
)
1769 struct perf_evsel
*evsel
= perf_evlist__event2evsel(evlist
, event
);
1773 return perf_evsel__parse_sample(evsel
, event
, sample
);
1776 size_t perf_evlist__fprintf(struct perf_evlist
*evlist
, FILE *fp
)
1778 struct perf_evsel
*evsel
;
1781 evlist__for_each_entry(evlist
, evsel
) {
1782 printed
+= fprintf(fp
, "%s%s", evsel
->idx
? ", " : "",
1783 perf_evsel__name(evsel
));
1786 return printed
+ fprintf(fp
, "\n");
1789 int perf_evlist__strerror_open(struct perf_evlist
*evlist
,
1790 int err
, char *buf
, size_t size
)
1793 char sbuf
[STRERR_BUFSIZE
], *emsg
= str_error_r(err
, sbuf
, sizeof(sbuf
));
1798 printed
= scnprintf(buf
, size
,
1800 "Hint:\tCheck /proc/sys/kernel/perf_event_paranoid setting.", emsg
);
1802 value
= perf_event_paranoid();
1804 printed
+= scnprintf(buf
+ printed
, size
- printed
, "\nHint:\t");
1807 printed
+= scnprintf(buf
+ printed
, size
- printed
,
1808 "For your workloads it needs to be <= 1\nHint:\t");
1810 printed
+= scnprintf(buf
+ printed
, size
- printed
,
1811 "For system wide tracing it needs to be set to -1.\n");
1813 printed
+= scnprintf(buf
+ printed
, size
- printed
,
1814 "Hint:\tTry: 'sudo sh -c \"echo -1 > /proc/sys/kernel/perf_event_paranoid\"'\n"
1815 "Hint:\tThe current value is %d.", value
);
1818 struct perf_evsel
*first
= perf_evlist__first(evlist
);
1821 if (sysctl__read_int("kernel/perf_event_max_sample_rate", &max_freq
) < 0)
1824 if (first
->attr
.sample_freq
< (u64
)max_freq
)
1827 printed
= scnprintf(buf
, size
,
1829 "Hint:\tCheck /proc/sys/kernel/perf_event_max_sample_rate.\n"
1830 "Hint:\tThe current value is %d and %" PRIu64
" is being requested.",
1831 emsg
, max_freq
, first
->attr
.sample_freq
);
1836 scnprintf(buf
, size
, "%s", emsg
);
1843 int perf_evlist__strerror_mmap(struct perf_evlist
*evlist
, int err
, char *buf
, size_t size
)
1845 char sbuf
[STRERR_BUFSIZE
], *emsg
= str_error_r(err
, sbuf
, sizeof(sbuf
));
1846 int pages_attempted
= evlist
->mmap_len
/ 1024, pages_max_per_user
, printed
= 0;
1850 sysctl__read_int("kernel/perf_event_mlock_kb", &pages_max_per_user
);
1851 printed
+= scnprintf(buf
+ printed
, size
- printed
,
1853 "Hint:\tCheck /proc/sys/kernel/perf_event_mlock_kb (%d kB) setting.\n"
1854 "Hint:\tTried using %zd kB.\n",
1855 emsg
, pages_max_per_user
, pages_attempted
);
1857 if (pages_attempted
>= pages_max_per_user
) {
1858 printed
+= scnprintf(buf
+ printed
, size
- printed
,
1859 "Hint:\tTry 'sudo sh -c \"echo %d > /proc/sys/kernel/perf_event_mlock_kb\"', or\n",
1860 pages_max_per_user
+ pages_attempted
);
1863 printed
+= scnprintf(buf
+ printed
, size
- printed
,
1864 "Hint:\tTry using a smaller -m/--mmap-pages value.");
1867 scnprintf(buf
, size
, "%s", emsg
);
1874 void perf_evlist__to_front(struct perf_evlist
*evlist
,
1875 struct perf_evsel
*move_evsel
)
1877 struct perf_evsel
*evsel
, *n
;
1880 if (move_evsel
== perf_evlist__first(evlist
))
1883 evlist__for_each_entry_safe(evlist
, n
, evsel
) {
1884 if (evsel
->leader
== move_evsel
->leader
)
1885 list_move_tail(&evsel
->node
, &move
);
1888 list_splice(&move
, &evlist
->entries
);
1891 void perf_evlist__set_tracking_event(struct perf_evlist
*evlist
,
1892 struct perf_evsel
*tracking_evsel
)
1894 struct perf_evsel
*evsel
;
1896 if (tracking_evsel
->tracking
)
1899 evlist__for_each_entry(evlist
, evsel
) {
1900 if (evsel
!= tracking_evsel
)
1901 evsel
->tracking
= false;
1904 tracking_evsel
->tracking
= true;
1908 perf_evlist__find_evsel_by_str(struct perf_evlist
*evlist
,
1911 struct perf_evsel
*evsel
;
1913 evlist__for_each_entry(evlist
, evsel
) {
1916 if (strcmp(str
, evsel
->name
) == 0)