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;
49 struct perf_evlist
*perf_evlist__new(void)
51 struct perf_evlist
*evlist
= zalloc(sizeof(*evlist
));
54 perf_evlist__init(evlist
, NULL
, NULL
);
59 struct perf_evlist
*perf_evlist__new_default(void)
61 struct perf_evlist
*evlist
= perf_evlist__new();
63 if (evlist
&& perf_evlist__add_default(evlist
)) {
64 perf_evlist__delete(evlist
);
71 struct perf_evlist
*perf_evlist__new_dummy(void)
73 struct perf_evlist
*evlist
= perf_evlist__new();
75 if (evlist
&& perf_evlist__add_dummy(evlist
)) {
76 perf_evlist__delete(evlist
);
84 * perf_evlist__set_id_pos - set the positions of event ids.
85 * @evlist: selected event list
87 * Events with compatible sample types all have the same id_pos
88 * and is_pos. For convenience, put a copy on evlist.
90 void perf_evlist__set_id_pos(struct perf_evlist
*evlist
)
92 struct perf_evsel
*first
= perf_evlist__first(evlist
);
94 evlist
->id_pos
= first
->id_pos
;
95 evlist
->is_pos
= first
->is_pos
;
98 static void perf_evlist__update_id_pos(struct perf_evlist
*evlist
)
100 struct perf_evsel
*evsel
;
102 evlist__for_each(evlist
, evsel
)
103 perf_evsel__calc_id_pos(evsel
);
105 perf_evlist__set_id_pos(evlist
);
108 static void perf_evlist__purge(struct perf_evlist
*evlist
)
110 struct perf_evsel
*pos
, *n
;
112 evlist__for_each_safe(evlist
, n
, pos
) {
113 list_del_init(&pos
->node
);
115 perf_evsel__delete(pos
);
118 evlist
->nr_entries
= 0;
121 void perf_evlist__exit(struct perf_evlist
*evlist
)
123 zfree(&evlist
->mmap
);
124 fdarray__exit(&evlist
->pollfd
);
127 void perf_evlist__delete(struct perf_evlist
*evlist
)
129 perf_evlist__munmap(evlist
);
130 perf_evlist__close(evlist
);
131 cpu_map__put(evlist
->cpus
);
132 thread_map__put(evlist
->threads
);
134 evlist
->threads
= NULL
;
135 perf_evlist__purge(evlist
);
136 perf_evlist__exit(evlist
);
140 static void __perf_evlist__propagate_maps(struct perf_evlist
*evlist
,
141 struct perf_evsel
*evsel
)
144 * We already have cpus for evsel (via PMU sysfs) so
145 * keep it, if there's no target cpu list defined.
147 if (!evsel
->own_cpus
|| evlist
->has_user_cpus
) {
148 cpu_map__put(evsel
->cpus
);
149 evsel
->cpus
= cpu_map__get(evlist
->cpus
);
150 } else if (evsel
->cpus
!= evsel
->own_cpus
) {
151 cpu_map__put(evsel
->cpus
);
152 evsel
->cpus
= cpu_map__get(evsel
->own_cpus
);
155 thread_map__put(evsel
->threads
);
156 evsel
->threads
= thread_map__get(evlist
->threads
);
159 static void perf_evlist__propagate_maps(struct perf_evlist
*evlist
)
161 struct perf_evsel
*evsel
;
163 evlist__for_each(evlist
, evsel
)
164 __perf_evlist__propagate_maps(evlist
, evsel
);
167 void perf_evlist__add(struct perf_evlist
*evlist
, struct perf_evsel
*entry
)
169 entry
->evlist
= evlist
;
170 list_add_tail(&entry
->node
, &evlist
->entries
);
171 entry
->idx
= evlist
->nr_entries
;
172 entry
->tracking
= !entry
->idx
;
174 if (!evlist
->nr_entries
++)
175 perf_evlist__set_id_pos(evlist
);
177 __perf_evlist__propagate_maps(evlist
, entry
);
180 void perf_evlist__remove(struct perf_evlist
*evlist
, struct perf_evsel
*evsel
)
182 evsel
->evlist
= NULL
;
183 list_del_init(&evsel
->node
);
184 evlist
->nr_entries
-= 1;
187 void perf_evlist__splice_list_tail(struct perf_evlist
*evlist
,
188 struct list_head
*list
)
190 struct perf_evsel
*evsel
, *temp
;
192 __evlist__for_each_safe(list
, temp
, evsel
) {
193 list_del_init(&evsel
->node
);
194 perf_evlist__add(evlist
, evsel
);
198 void __perf_evlist__set_leader(struct list_head
*list
)
200 struct perf_evsel
*evsel
, *leader
;
202 leader
= list_entry(list
->next
, struct perf_evsel
, node
);
203 evsel
= list_entry(list
->prev
, struct perf_evsel
, node
);
205 leader
->nr_members
= evsel
->idx
- leader
->idx
+ 1;
207 __evlist__for_each(list
, evsel
) {
208 evsel
->leader
= leader
;
212 void perf_evlist__set_leader(struct perf_evlist
*evlist
)
214 if (evlist
->nr_entries
) {
215 evlist
->nr_groups
= evlist
->nr_entries
> 1 ? 1 : 0;
216 __perf_evlist__set_leader(&evlist
->entries
);
220 void perf_event_attr__set_max_precise_ip(struct perf_event_attr
*attr
)
222 attr
->precise_ip
= 3;
224 while (attr
->precise_ip
!= 0) {
225 int fd
= sys_perf_event_open(attr
, 0, -1, -1, 0);
234 int perf_evlist__add_default(struct perf_evlist
*evlist
)
236 struct perf_event_attr attr
= {
237 .type
= PERF_TYPE_HARDWARE
,
238 .config
= PERF_COUNT_HW_CPU_CYCLES
,
240 struct perf_evsel
*evsel
;
242 event_attr_init(&attr
);
244 perf_event_attr__set_max_precise_ip(&attr
);
246 evsel
= perf_evsel__new(&attr
);
250 /* use asprintf() because free(evsel) assumes name is allocated */
251 if (asprintf(&evsel
->name
, "cycles%.*s",
252 attr
.precise_ip
? attr
.precise_ip
+ 1 : 0, ":ppp") < 0)
255 perf_evlist__add(evlist
, evsel
);
258 perf_evsel__delete(evsel
);
263 int perf_evlist__add_dummy(struct perf_evlist
*evlist
)
265 struct perf_event_attr attr
= {
266 .type
= PERF_TYPE_SOFTWARE
,
267 .config
= PERF_COUNT_SW_DUMMY
,
268 .size
= sizeof(attr
), /* to capture ABI version */
270 struct perf_evsel
*evsel
= perf_evsel__new(&attr
);
275 perf_evlist__add(evlist
, evsel
);
279 static int perf_evlist__add_attrs(struct perf_evlist
*evlist
,
280 struct perf_event_attr
*attrs
, size_t nr_attrs
)
282 struct perf_evsel
*evsel
, *n
;
286 for (i
= 0; i
< nr_attrs
; i
++) {
287 evsel
= perf_evsel__new_idx(attrs
+ i
, evlist
->nr_entries
+ i
);
289 goto out_delete_partial_list
;
290 list_add_tail(&evsel
->node
, &head
);
293 perf_evlist__splice_list_tail(evlist
, &head
);
297 out_delete_partial_list
:
298 __evlist__for_each_safe(&head
, n
, evsel
)
299 perf_evsel__delete(evsel
);
303 int __perf_evlist__add_default_attrs(struct perf_evlist
*evlist
,
304 struct perf_event_attr
*attrs
, size_t nr_attrs
)
308 for (i
= 0; i
< nr_attrs
; i
++)
309 event_attr_init(attrs
+ i
);
311 return perf_evlist__add_attrs(evlist
, attrs
, nr_attrs
);
315 perf_evlist__find_tracepoint_by_id(struct perf_evlist
*evlist
, int id
)
317 struct perf_evsel
*evsel
;
319 evlist__for_each(evlist
, evsel
) {
320 if (evsel
->attr
.type
== PERF_TYPE_TRACEPOINT
&&
321 (int)evsel
->attr
.config
== id
)
329 perf_evlist__find_tracepoint_by_name(struct perf_evlist
*evlist
,
332 struct perf_evsel
*evsel
;
334 evlist__for_each(evlist
, evsel
) {
335 if ((evsel
->attr
.type
== PERF_TYPE_TRACEPOINT
) &&
336 (strcmp(evsel
->name
, name
) == 0))
343 int perf_evlist__add_newtp(struct perf_evlist
*evlist
,
344 const char *sys
, const char *name
, void *handler
)
346 struct perf_evsel
*evsel
= perf_evsel__newtp(sys
, name
);
351 evsel
->handler
= handler
;
352 perf_evlist__add(evlist
, evsel
);
356 static int perf_evlist__nr_threads(struct perf_evlist
*evlist
,
357 struct perf_evsel
*evsel
)
359 if (evsel
->system_wide
)
362 return thread_map__nr(evlist
->threads
);
365 void perf_evlist__disable(struct perf_evlist
*evlist
)
367 struct perf_evsel
*pos
;
369 evlist__for_each(evlist
, pos
) {
370 if (!perf_evsel__is_group_leader(pos
) || !pos
->fd
)
372 perf_evsel__disable(pos
);
375 evlist
->enabled
= false;
378 void perf_evlist__enable(struct perf_evlist
*evlist
)
380 struct perf_evsel
*pos
;
382 evlist__for_each(evlist
, pos
) {
383 if (!perf_evsel__is_group_leader(pos
) || !pos
->fd
)
385 perf_evsel__enable(pos
);
388 evlist
->enabled
= true;
391 void perf_evlist__toggle_enable(struct perf_evlist
*evlist
)
393 (evlist
->enabled
? perf_evlist__disable
: perf_evlist__enable
)(evlist
);
396 static int perf_evlist__enable_event_cpu(struct perf_evlist
*evlist
,
397 struct perf_evsel
*evsel
, int cpu
)
400 int nr_threads
= perf_evlist__nr_threads(evlist
, evsel
);
405 for (thread
= 0; thread
< nr_threads
; thread
++) {
406 err
= ioctl(FD(evsel
, cpu
, thread
),
407 PERF_EVENT_IOC_ENABLE
, 0);
414 static int perf_evlist__enable_event_thread(struct perf_evlist
*evlist
,
415 struct perf_evsel
*evsel
,
419 int nr_cpus
= cpu_map__nr(evlist
->cpus
);
424 for (cpu
= 0; cpu
< nr_cpus
; cpu
++) {
425 err
= ioctl(FD(evsel
, cpu
, thread
), PERF_EVENT_IOC_ENABLE
, 0);
432 int perf_evlist__enable_event_idx(struct perf_evlist
*evlist
,
433 struct perf_evsel
*evsel
, int idx
)
435 bool per_cpu_mmaps
= !cpu_map__empty(evlist
->cpus
);
438 return perf_evlist__enable_event_cpu(evlist
, evsel
, idx
);
440 return perf_evlist__enable_event_thread(evlist
, evsel
, idx
);
443 int perf_evlist__alloc_pollfd(struct perf_evlist
*evlist
)
445 int nr_cpus
= cpu_map__nr(evlist
->cpus
);
446 int nr_threads
= thread_map__nr(evlist
->threads
);
448 struct perf_evsel
*evsel
;
450 evlist__for_each(evlist
, evsel
) {
451 if (evsel
->system_wide
)
454 nfds
+= nr_cpus
* nr_threads
;
457 if (fdarray__available_entries(&evlist
->pollfd
) < nfds
&&
458 fdarray__grow(&evlist
->pollfd
, nfds
) < 0)
464 static int __perf_evlist__add_pollfd(struct perf_evlist
*evlist
, int fd
, int idx
)
466 int pos
= fdarray__add(&evlist
->pollfd
, fd
, POLLIN
| POLLERR
| POLLHUP
);
468 * Save the idx so that when we filter out fds POLLHUP'ed we can
469 * close the associated evlist->mmap[] entry.
472 evlist
->pollfd
.priv
[pos
].idx
= idx
;
474 fcntl(fd
, F_SETFL
, O_NONBLOCK
);
480 int perf_evlist__add_pollfd(struct perf_evlist
*evlist
, int fd
)
482 return __perf_evlist__add_pollfd(evlist
, fd
, -1);
485 static void perf_evlist__munmap_filtered(struct fdarray
*fda
, int fd
)
487 struct perf_evlist
*evlist
= container_of(fda
, struct perf_evlist
, pollfd
);
489 perf_evlist__mmap_put(evlist
, fda
->priv
[fd
].idx
);
492 int perf_evlist__filter_pollfd(struct perf_evlist
*evlist
, short revents_and_mask
)
494 return fdarray__filter(&evlist
->pollfd
, revents_and_mask
,
495 perf_evlist__munmap_filtered
);
498 int perf_evlist__poll(struct perf_evlist
*evlist
, int timeout
)
500 return fdarray__poll(&evlist
->pollfd
, timeout
);
503 static void perf_evlist__id_hash(struct perf_evlist
*evlist
,
504 struct perf_evsel
*evsel
,
505 int cpu
, int thread
, u64 id
)
508 struct perf_sample_id
*sid
= SID(evsel
, cpu
, thread
);
512 hash
= hash_64(sid
->id
, PERF_EVLIST__HLIST_BITS
);
513 hlist_add_head(&sid
->node
, &evlist
->heads
[hash
]);
516 void perf_evlist__id_add(struct perf_evlist
*evlist
, struct perf_evsel
*evsel
,
517 int cpu
, int thread
, u64 id
)
519 perf_evlist__id_hash(evlist
, evsel
, cpu
, thread
, id
);
520 evsel
->id
[evsel
->ids
++] = id
;
523 int perf_evlist__id_add_fd(struct perf_evlist
*evlist
,
524 struct perf_evsel
*evsel
,
525 int cpu
, int thread
, int fd
)
527 u64 read_data
[4] = { 0, };
528 int id_idx
= 1; /* The first entry is the counter value */
532 ret
= ioctl(fd
, PERF_EVENT_IOC_ID
, &id
);
539 /* Legacy way to get event id.. All hail to old kernels! */
542 * This way does not work with group format read, so bail
545 if (perf_evlist__read_format(evlist
) & PERF_FORMAT_GROUP
)
548 if (!(evsel
->attr
.read_format
& PERF_FORMAT_ID
) ||
549 read(fd
, &read_data
, sizeof(read_data
)) == -1)
552 if (evsel
->attr
.read_format
& PERF_FORMAT_TOTAL_TIME_ENABLED
)
554 if (evsel
->attr
.read_format
& PERF_FORMAT_TOTAL_TIME_RUNNING
)
557 id
= read_data
[id_idx
];
560 perf_evlist__id_add(evlist
, evsel
, cpu
, thread
, id
);
564 static void perf_evlist__set_sid_idx(struct perf_evlist
*evlist
,
565 struct perf_evsel
*evsel
, int idx
, int cpu
,
568 struct perf_sample_id
*sid
= SID(evsel
, cpu
, thread
);
570 if (evlist
->cpus
&& cpu
>= 0)
571 sid
->cpu
= evlist
->cpus
->map
[cpu
];
574 if (!evsel
->system_wide
&& evlist
->threads
&& thread
>= 0)
575 sid
->tid
= thread_map__pid(evlist
->threads
, thread
);
580 struct perf_sample_id
*perf_evlist__id2sid(struct perf_evlist
*evlist
, u64 id
)
582 struct hlist_head
*head
;
583 struct perf_sample_id
*sid
;
586 hash
= hash_64(id
, PERF_EVLIST__HLIST_BITS
);
587 head
= &evlist
->heads
[hash
];
589 hlist_for_each_entry(sid
, head
, node
)
596 struct perf_evsel
*perf_evlist__id2evsel(struct perf_evlist
*evlist
, u64 id
)
598 struct perf_sample_id
*sid
;
600 if (evlist
->nr_entries
== 1 || !id
)
601 return perf_evlist__first(evlist
);
603 sid
= perf_evlist__id2sid(evlist
, id
);
607 if (!perf_evlist__sample_id_all(evlist
))
608 return perf_evlist__first(evlist
);
613 struct perf_evsel
*perf_evlist__id2evsel_strict(struct perf_evlist
*evlist
,
616 struct perf_sample_id
*sid
;
621 sid
= perf_evlist__id2sid(evlist
, id
);
628 static int perf_evlist__event2id(struct perf_evlist
*evlist
,
629 union perf_event
*event
, u64
*id
)
631 const u64
*array
= event
->sample
.array
;
634 n
= (event
->header
.size
- sizeof(event
->header
)) >> 3;
636 if (event
->header
.type
== PERF_RECORD_SAMPLE
) {
637 if (evlist
->id_pos
>= n
)
639 *id
= array
[evlist
->id_pos
];
641 if (evlist
->is_pos
> n
)
649 static struct perf_evsel
*perf_evlist__event2evsel(struct perf_evlist
*evlist
,
650 union perf_event
*event
)
652 struct perf_evsel
*first
= perf_evlist__first(evlist
);
653 struct hlist_head
*head
;
654 struct perf_sample_id
*sid
;
658 if (evlist
->nr_entries
== 1)
661 if (!first
->attr
.sample_id_all
&&
662 event
->header
.type
!= PERF_RECORD_SAMPLE
)
665 if (perf_evlist__event2id(evlist
, event
, &id
))
668 /* Synthesized events have an id of zero */
672 hash
= hash_64(id
, PERF_EVLIST__HLIST_BITS
);
673 head
= &evlist
->heads
[hash
];
675 hlist_for_each_entry(sid
, head
, node
) {
682 /* When check_messup is true, 'end' must points to a good entry */
683 static union perf_event
*
684 perf_mmap__read(struct perf_mmap
*md
, bool check_messup
, u64 start
,
687 unsigned char *data
= md
->base
+ page_size
;
688 union perf_event
*event
= NULL
;
689 int diff
= end
- start
;
693 * If we're further behind than half the buffer, there's a chance
694 * the writer will bite our tail and mess up the samples under us.
696 * If we somehow ended up ahead of the 'end', we got messed up.
698 * In either case, truncate and restart at 'end'.
700 if (diff
> md
->mask
/ 2 || diff
< 0) {
701 fprintf(stderr
, "WARNING: failed to keep up with mmap data.\n");
704 * 'end' points to a known good entry, start there.
711 if (diff
>= (int)sizeof(event
->header
)) {
714 event
= (union perf_event
*)&data
[start
& md
->mask
];
715 size
= event
->header
.size
;
717 if (size
< sizeof(event
->header
) || diff
< (int)size
) {
723 * Event straddles the mmap boundary -- header should always
724 * be inside due to u64 alignment of output.
726 if ((start
& md
->mask
) + size
!= ((start
+ size
) & md
->mask
)) {
727 unsigned int offset
= start
;
728 unsigned int len
= min(sizeof(*event
), size
), cpy
;
729 void *dst
= md
->event_copy
;
732 cpy
= min(md
->mask
+ 1 - (offset
& md
->mask
), len
);
733 memcpy(dst
, &data
[offset
& md
->mask
], cpy
);
739 event
= (union perf_event
*) md
->event_copy
;
752 union perf_event
*perf_evlist__mmap_read(struct perf_evlist
*evlist
, int idx
)
754 struct perf_mmap
*md
= &evlist
->mmap
[idx
];
759 * Check if event was unmapped due to a POLLHUP/POLLERR.
761 if (!atomic_read(&md
->refcnt
))
764 head
= perf_mmap__read_head(md
);
766 return perf_mmap__read(md
, evlist
->overwrite
, old
, head
, &md
->prev
);
770 perf_evlist__mmap_read_backward(struct perf_evlist
*evlist
, int idx
)
772 struct perf_mmap
*md
= &evlist
->mmap
[idx
];
774 u64 start
= md
->prev
;
777 * Check if event was unmapped due to a POLLHUP/POLLERR.
779 if (!atomic_read(&md
->refcnt
))
782 head
= perf_mmap__read_head(md
);
787 * 'head' pointer starts from 0. Kernel minus sizeof(record) form
788 * it each time when kernel writes to it, so in fact 'head' is
789 * negative. 'end' pointer is made manually by adding the size of
790 * the ring buffer to 'head' pointer, means the validate data can
791 * read is the whole ring buffer. If 'end' is positive, the ring
792 * buffer has not fully filled, so we must adjust 'end' to 0.
794 * However, since both 'head' and 'end' is unsigned, we can't
795 * simply compare 'end' against 0. Here we compare '-head' and
796 * the size of the ring buffer, where -head is the number of bytes
797 * kernel write to the ring buffer.
799 if (-head
< (u64
)(md
->mask
+ 1))
802 end
= head
+ md
->mask
+ 1;
804 return perf_mmap__read(md
, false, start
, end
, &md
->prev
);
807 void perf_evlist__mmap_read_catchup(struct perf_evlist
*evlist
, int idx
)
809 struct perf_mmap
*md
= &evlist
->mmap
[idx
];
812 if (!atomic_read(&md
->refcnt
))
815 head
= perf_mmap__read_head(md
);
819 static bool perf_mmap__empty(struct perf_mmap
*md
)
821 return perf_mmap__read_head(md
) == md
->prev
&& !md
->auxtrace_mmap
.base
;
824 static void perf_evlist__mmap_get(struct perf_evlist
*evlist
, int idx
)
826 atomic_inc(&evlist
->mmap
[idx
].refcnt
);
829 static void perf_evlist__mmap_put(struct perf_evlist
*evlist
, int idx
)
831 BUG_ON(atomic_read(&evlist
->mmap
[idx
].refcnt
) == 0);
833 if (atomic_dec_and_test(&evlist
->mmap
[idx
].refcnt
))
834 __perf_evlist__munmap(evlist
, idx
);
837 void perf_evlist__mmap_consume(struct perf_evlist
*evlist
, int idx
)
839 struct perf_mmap
*md
= &evlist
->mmap
[idx
];
841 if (!evlist
->overwrite
) {
844 perf_mmap__write_tail(md
, old
);
847 if (atomic_read(&md
->refcnt
) == 1 && perf_mmap__empty(md
))
848 perf_evlist__mmap_put(evlist
, idx
);
851 int __weak
auxtrace_mmap__mmap(struct auxtrace_mmap
*mm __maybe_unused
,
852 struct auxtrace_mmap_params
*mp __maybe_unused
,
853 void *userpg __maybe_unused
,
854 int fd __maybe_unused
)
859 void __weak
auxtrace_mmap__munmap(struct auxtrace_mmap
*mm __maybe_unused
)
863 void __weak
auxtrace_mmap_params__init(
864 struct auxtrace_mmap_params
*mp __maybe_unused
,
865 off_t auxtrace_offset __maybe_unused
,
866 unsigned int auxtrace_pages __maybe_unused
,
867 bool auxtrace_overwrite __maybe_unused
)
871 void __weak
auxtrace_mmap_params__set_idx(
872 struct auxtrace_mmap_params
*mp __maybe_unused
,
873 struct perf_evlist
*evlist __maybe_unused
,
874 int idx __maybe_unused
,
875 bool per_cpu __maybe_unused
)
879 static void __perf_evlist__munmap(struct perf_evlist
*evlist
, int idx
)
881 if (evlist
->mmap
[idx
].base
!= NULL
) {
882 munmap(evlist
->mmap
[idx
].base
, evlist
->mmap_len
);
883 evlist
->mmap
[idx
].base
= NULL
;
884 atomic_set(&evlist
->mmap
[idx
].refcnt
, 0);
886 auxtrace_mmap__munmap(&evlist
->mmap
[idx
].auxtrace_mmap
);
889 void perf_evlist__munmap(struct perf_evlist
*evlist
)
893 if (evlist
->mmap
== NULL
)
896 for (i
= 0; i
< evlist
->nr_mmaps
; i
++)
897 __perf_evlist__munmap(evlist
, i
);
899 zfree(&evlist
->mmap
);
902 static int perf_evlist__alloc_mmap(struct perf_evlist
*evlist
)
904 evlist
->nr_mmaps
= cpu_map__nr(evlist
->cpus
);
905 if (cpu_map__empty(evlist
->cpus
))
906 evlist
->nr_mmaps
= thread_map__nr(evlist
->threads
);
907 evlist
->mmap
= zalloc(evlist
->nr_mmaps
* sizeof(struct perf_mmap
));
908 return evlist
->mmap
!= NULL
? 0 : -ENOMEM
;
914 struct auxtrace_mmap_params auxtrace_mp
;
917 static int __perf_evlist__mmap(struct perf_evlist
*evlist
, int idx
,
918 struct mmap_params
*mp
, int fd
)
921 * The last one will be done at perf_evlist__mmap_consume(), so that we
922 * make sure we don't prevent tools from consuming every last event in
925 * I.e. we can get the POLLHUP meaning that the fd doesn't exist
926 * anymore, but the last events for it are still in the ring buffer,
927 * waiting to be consumed.
929 * Tools can chose to ignore this at their own discretion, but the
930 * evlist layer can't just drop it when filtering events in
931 * perf_evlist__filter_pollfd().
933 atomic_set(&evlist
->mmap
[idx
].refcnt
, 2);
934 evlist
->mmap
[idx
].prev
= 0;
935 evlist
->mmap
[idx
].mask
= mp
->mask
;
936 evlist
->mmap
[idx
].base
= mmap(NULL
, evlist
->mmap_len
, mp
->prot
,
938 if (evlist
->mmap
[idx
].base
== MAP_FAILED
) {
939 pr_debug2("failed to mmap perf event ring buffer, error %d\n",
941 evlist
->mmap
[idx
].base
= NULL
;
945 if (auxtrace_mmap__mmap(&evlist
->mmap
[idx
].auxtrace_mmap
,
946 &mp
->auxtrace_mp
, evlist
->mmap
[idx
].base
, fd
))
952 static int perf_evlist__mmap_per_evsel(struct perf_evlist
*evlist
, int idx
,
953 struct mmap_params
*mp
, int cpu
,
954 int thread
, int *output
)
956 struct perf_evsel
*evsel
;
958 evlist__for_each(evlist
, evsel
) {
961 if (evsel
->system_wide
&& thread
)
964 fd
= FD(evsel
, cpu
, thread
);
968 if (__perf_evlist__mmap(evlist
, idx
, mp
, *output
) < 0)
971 if (ioctl(fd
, PERF_EVENT_IOC_SET_OUTPUT
, *output
) != 0)
974 perf_evlist__mmap_get(evlist
, idx
);
978 * The system_wide flag causes a selected event to be opened
979 * always without a pid. Consequently it will never get a
980 * POLLHUP, but it is used for tracking in combination with
981 * other events, so it should not need to be polled anyway.
982 * Therefore don't add it for polling.
984 if (!evsel
->system_wide
&&
985 __perf_evlist__add_pollfd(evlist
, fd
, idx
) < 0) {
986 perf_evlist__mmap_put(evlist
, idx
);
990 if (evsel
->attr
.read_format
& PERF_FORMAT_ID
) {
991 if (perf_evlist__id_add_fd(evlist
, evsel
, cpu
, thread
,
994 perf_evlist__set_sid_idx(evlist
, evsel
, idx
, cpu
,
1002 static int perf_evlist__mmap_per_cpu(struct perf_evlist
*evlist
,
1003 struct mmap_params
*mp
)
1006 int nr_cpus
= cpu_map__nr(evlist
->cpus
);
1007 int nr_threads
= thread_map__nr(evlist
->threads
);
1009 pr_debug2("perf event ring buffer mmapped per cpu\n");
1010 for (cpu
= 0; cpu
< nr_cpus
; cpu
++) {
1013 auxtrace_mmap_params__set_idx(&mp
->auxtrace_mp
, evlist
, cpu
,
1016 for (thread
= 0; thread
< nr_threads
; thread
++) {
1017 if (perf_evlist__mmap_per_evsel(evlist
, cpu
, mp
, cpu
,
1026 for (cpu
= 0; cpu
< nr_cpus
; cpu
++)
1027 __perf_evlist__munmap(evlist
, cpu
);
1031 static int perf_evlist__mmap_per_thread(struct perf_evlist
*evlist
,
1032 struct mmap_params
*mp
)
1035 int nr_threads
= thread_map__nr(evlist
->threads
);
1037 pr_debug2("perf event ring buffer mmapped per thread\n");
1038 for (thread
= 0; thread
< nr_threads
; thread
++) {
1041 auxtrace_mmap_params__set_idx(&mp
->auxtrace_mp
, evlist
, thread
,
1044 if (perf_evlist__mmap_per_evsel(evlist
, thread
, mp
, 0, thread
,
1052 for (thread
= 0; thread
< nr_threads
; thread
++)
1053 __perf_evlist__munmap(evlist
, thread
);
1057 unsigned long perf_event_mlock_kb_in_pages(void)
1059 unsigned long pages
;
1062 if (sysctl__read_int("kernel/perf_event_mlock_kb", &max
) < 0) {
1064 * Pick a once upon a time good value, i.e. things look
1065 * strange since we can't read a sysctl value, but lets not
1070 max
-= (page_size
/ 1024);
1073 pages
= (max
* 1024) / page_size
;
1074 if (!is_power_of_2(pages
))
1075 pages
= rounddown_pow_of_two(pages
);
1080 static size_t perf_evlist__mmap_size(unsigned long pages
)
1082 if (pages
== UINT_MAX
)
1083 pages
= perf_event_mlock_kb_in_pages();
1084 else if (!is_power_of_2(pages
))
1087 return (pages
+ 1) * page_size
;
1090 static long parse_pages_arg(const char *str
, unsigned long min
,
1093 unsigned long pages
, val
;
1094 static struct parse_tag tags
[] = {
1095 { .tag
= 'B', .mult
= 1 },
1096 { .tag
= 'K', .mult
= 1 << 10 },
1097 { .tag
= 'M', .mult
= 1 << 20 },
1098 { .tag
= 'G', .mult
= 1 << 30 },
1105 val
= parse_tag_value(str
, tags
);
1106 if (val
!= (unsigned long) -1) {
1107 /* we got file size value */
1108 pages
= PERF_ALIGN(val
, page_size
) / page_size
;
1110 /* we got pages count value */
1112 pages
= strtoul(str
, &eptr
, 10);
1117 if (pages
== 0 && min
== 0) {
1118 /* leave number of pages at 0 */
1119 } else if (!is_power_of_2(pages
)) {
1120 /* round pages up to next power of 2 */
1121 pages
= roundup_pow_of_two(pages
);
1124 pr_info("rounding mmap pages size to %lu bytes (%lu pages)\n",
1125 pages
* page_size
, pages
);
1134 int __perf_evlist__parse_mmap_pages(unsigned int *mmap_pages
, const char *str
)
1136 unsigned long max
= UINT_MAX
;
1139 if (max
> SIZE_MAX
/ page_size
)
1140 max
= SIZE_MAX
/ page_size
;
1142 pages
= parse_pages_arg(str
, 1, max
);
1144 pr_err("Invalid argument for --mmap_pages/-m\n");
1148 *mmap_pages
= pages
;
1152 int perf_evlist__parse_mmap_pages(const struct option
*opt
, const char *str
,
1153 int unset __maybe_unused
)
1155 return __perf_evlist__parse_mmap_pages(opt
->value
, str
);
1159 * perf_evlist__mmap_ex - Create mmaps to receive events.
1160 * @evlist: list of events
1161 * @pages: map length in pages
1162 * @overwrite: overwrite older events?
1163 * @auxtrace_pages - auxtrace map length in pages
1164 * @auxtrace_overwrite - overwrite older auxtrace data?
1166 * If @overwrite is %false the user needs to signal event consumption using
1167 * perf_mmap__write_tail(). Using perf_evlist__mmap_read() does this
1170 * Similarly, if @auxtrace_overwrite is %false the user needs to signal data
1171 * consumption using auxtrace_mmap__write_tail().
1173 * Return: %0 on success, negative error code otherwise.
1175 int perf_evlist__mmap_ex(struct perf_evlist
*evlist
, unsigned int pages
,
1176 bool overwrite
, unsigned int auxtrace_pages
,
1177 bool auxtrace_overwrite
)
1179 struct perf_evsel
*evsel
;
1180 const struct cpu_map
*cpus
= evlist
->cpus
;
1181 const struct thread_map
*threads
= evlist
->threads
;
1182 struct mmap_params mp
= {
1183 .prot
= PROT_READ
| (overwrite
? 0 : PROT_WRITE
),
1186 if (evlist
->mmap
== NULL
&& perf_evlist__alloc_mmap(evlist
) < 0)
1189 if (evlist
->pollfd
.entries
== NULL
&& perf_evlist__alloc_pollfd(evlist
) < 0)
1192 evlist
->overwrite
= overwrite
;
1193 evlist
->mmap_len
= perf_evlist__mmap_size(pages
);
1194 pr_debug("mmap size %zuB\n", evlist
->mmap_len
);
1195 mp
.mask
= evlist
->mmap_len
- page_size
- 1;
1197 auxtrace_mmap_params__init(&mp
.auxtrace_mp
, evlist
->mmap_len
,
1198 auxtrace_pages
, auxtrace_overwrite
);
1200 evlist__for_each(evlist
, evsel
) {
1201 if ((evsel
->attr
.read_format
& PERF_FORMAT_ID
) &&
1202 evsel
->sample_id
== NULL
&&
1203 perf_evsel__alloc_id(evsel
, cpu_map__nr(cpus
), threads
->nr
) < 0)
1207 if (cpu_map__empty(cpus
))
1208 return perf_evlist__mmap_per_thread(evlist
, &mp
);
1210 return perf_evlist__mmap_per_cpu(evlist
, &mp
);
1213 int perf_evlist__mmap(struct perf_evlist
*evlist
, unsigned int pages
,
1216 return perf_evlist__mmap_ex(evlist
, pages
, overwrite
, 0, false);
1219 int perf_evlist__create_maps(struct perf_evlist
*evlist
, struct target
*target
)
1221 struct cpu_map
*cpus
;
1222 struct thread_map
*threads
;
1224 threads
= thread_map__new_str(target
->pid
, target
->tid
, target
->uid
);
1229 if (target__uses_dummy_map(target
))
1230 cpus
= cpu_map__dummy_new();
1232 cpus
= cpu_map__new(target
->cpu_list
);
1235 goto out_delete_threads
;
1237 evlist
->has_user_cpus
= !!target
->cpu_list
;
1239 perf_evlist__set_maps(evlist
, cpus
, threads
);
1244 thread_map__put(threads
);
1248 void perf_evlist__set_maps(struct perf_evlist
*evlist
, struct cpu_map
*cpus
,
1249 struct thread_map
*threads
)
1252 * Allow for the possibility that one or another of the maps isn't being
1253 * changed i.e. don't put it. Note we are assuming the maps that are
1254 * being applied are brand new and evlist is taking ownership of the
1255 * original reference count of 1. If that is not the case it is up to
1256 * the caller to increase the reference count.
1258 if (cpus
!= evlist
->cpus
) {
1259 cpu_map__put(evlist
->cpus
);
1260 evlist
->cpus
= cpu_map__get(cpus
);
1263 if (threads
!= evlist
->threads
) {
1264 thread_map__put(evlist
->threads
);
1265 evlist
->threads
= thread_map__get(threads
);
1268 perf_evlist__propagate_maps(evlist
);
1271 void __perf_evlist__set_sample_bit(struct perf_evlist
*evlist
,
1272 enum perf_event_sample_format bit
)
1274 struct perf_evsel
*evsel
;
1276 evlist__for_each(evlist
, evsel
)
1277 __perf_evsel__set_sample_bit(evsel
, bit
);
1280 void __perf_evlist__reset_sample_bit(struct perf_evlist
*evlist
,
1281 enum perf_event_sample_format bit
)
1283 struct perf_evsel
*evsel
;
1285 evlist__for_each(evlist
, evsel
)
1286 __perf_evsel__reset_sample_bit(evsel
, bit
);
1289 int perf_evlist__apply_filters(struct perf_evlist
*evlist
, struct perf_evsel
**err_evsel
)
1291 struct perf_evsel
*evsel
;
1293 const int ncpus
= cpu_map__nr(evlist
->cpus
),
1294 nthreads
= thread_map__nr(evlist
->threads
);
1296 evlist__for_each(evlist
, evsel
) {
1297 if (evsel
->filter
== NULL
)
1301 * filters only work for tracepoint event, which doesn't have cpu limit.
1302 * So evlist and evsel should always be same.
1304 err
= perf_evsel__apply_filter(evsel
, ncpus
, nthreads
, evsel
->filter
);
1314 int perf_evlist__set_filter(struct perf_evlist
*evlist
, const char *filter
)
1316 struct perf_evsel
*evsel
;
1319 evlist__for_each(evlist
, evsel
) {
1320 if (evsel
->attr
.type
!= PERF_TYPE_TRACEPOINT
)
1323 err
= perf_evsel__set_filter(evsel
, filter
);
1331 int perf_evlist__set_filter_pids(struct perf_evlist
*evlist
, size_t npids
, pid_t
*pids
)
1337 for (i
= 0; i
< npids
; ++i
) {
1339 if (asprintf(&filter
, "common_pid != %d", pids
[i
]) < 0)
1344 if (asprintf(&tmp
, "%s && common_pid != %d", filter
, pids
[i
]) < 0)
1352 ret
= perf_evlist__set_filter(evlist
, filter
);
1358 int perf_evlist__set_filter_pid(struct perf_evlist
*evlist
, pid_t pid
)
1360 return perf_evlist__set_filter_pids(evlist
, 1, &pid
);
1363 bool perf_evlist__valid_sample_type(struct perf_evlist
*evlist
)
1365 struct perf_evsel
*pos
;
1367 if (evlist
->nr_entries
== 1)
1370 if (evlist
->id_pos
< 0 || evlist
->is_pos
< 0)
1373 evlist__for_each(evlist
, pos
) {
1374 if (pos
->id_pos
!= evlist
->id_pos
||
1375 pos
->is_pos
!= evlist
->is_pos
)
1382 u64
__perf_evlist__combined_sample_type(struct perf_evlist
*evlist
)
1384 struct perf_evsel
*evsel
;
1386 if (evlist
->combined_sample_type
)
1387 return evlist
->combined_sample_type
;
1389 evlist__for_each(evlist
, evsel
)
1390 evlist
->combined_sample_type
|= evsel
->attr
.sample_type
;
1392 return evlist
->combined_sample_type
;
1395 u64
perf_evlist__combined_sample_type(struct perf_evlist
*evlist
)
1397 evlist
->combined_sample_type
= 0;
1398 return __perf_evlist__combined_sample_type(evlist
);
1401 u64
perf_evlist__combined_branch_type(struct perf_evlist
*evlist
)
1403 struct perf_evsel
*evsel
;
1404 u64 branch_type
= 0;
1406 evlist__for_each(evlist
, evsel
)
1407 branch_type
|= evsel
->attr
.branch_sample_type
;
1411 bool perf_evlist__valid_read_format(struct perf_evlist
*evlist
)
1413 struct perf_evsel
*first
= perf_evlist__first(evlist
), *pos
= first
;
1414 u64 read_format
= first
->attr
.read_format
;
1415 u64 sample_type
= first
->attr
.sample_type
;
1417 evlist__for_each(evlist
, pos
) {
1418 if (read_format
!= pos
->attr
.read_format
)
1422 /* PERF_SAMPLE_READ imples PERF_FORMAT_ID. */
1423 if ((sample_type
& PERF_SAMPLE_READ
) &&
1424 !(read_format
& PERF_FORMAT_ID
)) {
1431 u64
perf_evlist__read_format(struct perf_evlist
*evlist
)
1433 struct perf_evsel
*first
= perf_evlist__first(evlist
);
1434 return first
->attr
.read_format
;
1437 u16
perf_evlist__id_hdr_size(struct perf_evlist
*evlist
)
1439 struct perf_evsel
*first
= perf_evlist__first(evlist
);
1440 struct perf_sample
*data
;
1444 if (!first
->attr
.sample_id_all
)
1447 sample_type
= first
->attr
.sample_type
;
1449 if (sample_type
& PERF_SAMPLE_TID
)
1450 size
+= sizeof(data
->tid
) * 2;
1452 if (sample_type
& PERF_SAMPLE_TIME
)
1453 size
+= sizeof(data
->time
);
1455 if (sample_type
& PERF_SAMPLE_ID
)
1456 size
+= sizeof(data
->id
);
1458 if (sample_type
& PERF_SAMPLE_STREAM_ID
)
1459 size
+= sizeof(data
->stream_id
);
1461 if (sample_type
& PERF_SAMPLE_CPU
)
1462 size
+= sizeof(data
->cpu
) * 2;
1464 if (sample_type
& PERF_SAMPLE_IDENTIFIER
)
1465 size
+= sizeof(data
->id
);
1470 bool perf_evlist__valid_sample_id_all(struct perf_evlist
*evlist
)
1472 struct perf_evsel
*first
= perf_evlist__first(evlist
), *pos
= first
;
1474 evlist__for_each_continue(evlist
, pos
) {
1475 if (first
->attr
.sample_id_all
!= pos
->attr
.sample_id_all
)
1482 bool perf_evlist__sample_id_all(struct perf_evlist
*evlist
)
1484 struct perf_evsel
*first
= perf_evlist__first(evlist
);
1485 return first
->attr
.sample_id_all
;
1488 void perf_evlist__set_selected(struct perf_evlist
*evlist
,
1489 struct perf_evsel
*evsel
)
1491 evlist
->selected
= evsel
;
1494 void perf_evlist__close(struct perf_evlist
*evlist
)
1496 struct perf_evsel
*evsel
;
1497 int ncpus
= cpu_map__nr(evlist
->cpus
);
1498 int nthreads
= thread_map__nr(evlist
->threads
);
1501 evlist__for_each_reverse(evlist
, evsel
) {
1502 n
= evsel
->cpus
? evsel
->cpus
->nr
: ncpus
;
1503 perf_evsel__close(evsel
, n
, nthreads
);
1507 static int perf_evlist__create_syswide_maps(struct perf_evlist
*evlist
)
1509 struct cpu_map
*cpus
;
1510 struct thread_map
*threads
;
1514 * Try reading /sys/devices/system/cpu/online to get
1517 * FIXME: -ENOMEM is the best we can do here, the cpu_map
1518 * code needs an overhaul to properly forward the
1519 * error, and we may not want to do that fallback to a
1520 * default cpu identity map :-\
1522 cpus
= cpu_map__new(NULL
);
1526 threads
= thread_map__new_dummy();
1530 perf_evlist__set_maps(evlist
, cpus
, threads
);
1538 int perf_evlist__open(struct perf_evlist
*evlist
)
1540 struct perf_evsel
*evsel
;
1544 * Default: one fd per CPU, all threads, aka systemwide
1545 * as sys_perf_event_open(cpu = -1, thread = -1) is EINVAL
1547 if (evlist
->threads
== NULL
&& evlist
->cpus
== NULL
) {
1548 err
= perf_evlist__create_syswide_maps(evlist
);
1553 perf_evlist__update_id_pos(evlist
);
1555 evlist__for_each(evlist
, evsel
) {
1556 err
= perf_evsel__open(evsel
, evsel
->cpus
, evsel
->threads
);
1563 perf_evlist__close(evlist
);
1568 int perf_evlist__prepare_workload(struct perf_evlist
*evlist
, struct target
*target
,
1569 const char *argv
[], bool pipe_output
,
1570 void (*exec_error
)(int signo
, siginfo_t
*info
, void *ucontext
))
1572 int child_ready_pipe
[2], go_pipe
[2];
1575 if (pipe(child_ready_pipe
) < 0) {
1576 perror("failed to create 'ready' pipe");
1580 if (pipe(go_pipe
) < 0) {
1581 perror("failed to create 'go' pipe");
1582 goto out_close_ready_pipe
;
1585 evlist
->workload
.pid
= fork();
1586 if (evlist
->workload
.pid
< 0) {
1587 perror("failed to fork");
1588 goto out_close_pipes
;
1591 if (!evlist
->workload
.pid
) {
1597 signal(SIGTERM
, SIG_DFL
);
1599 close(child_ready_pipe
[0]);
1601 fcntl(go_pipe
[0], F_SETFD
, FD_CLOEXEC
);
1604 * Tell the parent we're ready to go
1606 close(child_ready_pipe
[1]);
1609 * Wait until the parent tells us to go.
1611 ret
= read(go_pipe
[0], &bf
, 1);
1613 * The parent will ask for the execvp() to be performed by
1614 * writing exactly one byte, in workload.cork_fd, usually via
1615 * perf_evlist__start_workload().
1617 * For cancelling the workload without actually running it,
1618 * the parent will just close workload.cork_fd, without writing
1619 * anything, i.e. read will return zero and we just exit()
1624 perror("unable to read pipe");
1628 execvp(argv
[0], (char **)argv
);
1633 val
.sival_int
= errno
;
1634 if (sigqueue(getppid(), SIGUSR1
, val
))
1642 struct sigaction act
= {
1643 .sa_flags
= SA_SIGINFO
,
1644 .sa_sigaction
= exec_error
,
1646 sigaction(SIGUSR1
, &act
, NULL
);
1649 if (target__none(target
)) {
1650 if (evlist
->threads
== NULL
) {
1651 fprintf(stderr
, "FATAL: evlist->threads need to be set at this point (%s:%d).\n",
1652 __func__
, __LINE__
);
1653 goto out_close_pipes
;
1655 thread_map__set_pid(evlist
->threads
, 0, evlist
->workload
.pid
);
1658 close(child_ready_pipe
[1]);
1661 * wait for child to settle
1663 if (read(child_ready_pipe
[0], &bf
, 1) == -1) {
1664 perror("unable to read pipe");
1665 goto out_close_pipes
;
1668 fcntl(go_pipe
[1], F_SETFD
, FD_CLOEXEC
);
1669 evlist
->workload
.cork_fd
= go_pipe
[1];
1670 close(child_ready_pipe
[0]);
1676 out_close_ready_pipe
:
1677 close(child_ready_pipe
[0]);
1678 close(child_ready_pipe
[1]);
1682 int perf_evlist__start_workload(struct perf_evlist
*evlist
)
1684 if (evlist
->workload
.cork_fd
> 0) {
1688 * Remove the cork, let it rip!
1690 ret
= write(evlist
->workload
.cork_fd
, &bf
, 1);
1692 perror("enable to write to pipe");
1694 close(evlist
->workload
.cork_fd
);
1701 int perf_evlist__parse_sample(struct perf_evlist
*evlist
, union perf_event
*event
,
1702 struct perf_sample
*sample
)
1704 struct perf_evsel
*evsel
= perf_evlist__event2evsel(evlist
, event
);
1708 return perf_evsel__parse_sample(evsel
, event
, sample
);
1711 size_t perf_evlist__fprintf(struct perf_evlist
*evlist
, FILE *fp
)
1713 struct perf_evsel
*evsel
;
1716 evlist__for_each(evlist
, evsel
) {
1717 printed
+= fprintf(fp
, "%s%s", evsel
->idx
? ", " : "",
1718 perf_evsel__name(evsel
));
1721 return printed
+ fprintf(fp
, "\n");
1724 int perf_evlist__strerror_open(struct perf_evlist
*evlist
,
1725 int err
, char *buf
, size_t size
)
1728 char sbuf
[STRERR_BUFSIZE
], *emsg
= strerror_r(err
, sbuf
, sizeof(sbuf
));
1733 printed
= scnprintf(buf
, size
,
1735 "Hint:\tCheck /proc/sys/kernel/perf_event_paranoid setting.", emsg
);
1737 value
= perf_event_paranoid();
1739 printed
+= scnprintf(buf
+ printed
, size
- printed
, "\nHint:\t");
1742 printed
+= scnprintf(buf
+ printed
, size
- printed
,
1743 "For your workloads it needs to be <= 1\nHint:\t");
1745 printed
+= scnprintf(buf
+ printed
, size
- printed
,
1746 "For system wide tracing it needs to be set to -1.\n");
1748 printed
+= scnprintf(buf
+ printed
, size
- printed
,
1749 "Hint:\tTry: 'sudo sh -c \"echo -1 > /proc/sys/kernel/perf_event_paranoid\"'\n"
1750 "Hint:\tThe current value is %d.", value
);
1753 struct perf_evsel
*first
= perf_evlist__first(evlist
);
1756 if (sysctl__read_int("kernel/perf_event_max_sample_rate", &max_freq
) < 0)
1759 if (first
->attr
.sample_freq
< (u64
)max_freq
)
1762 printed
= scnprintf(buf
, size
,
1764 "Hint:\tCheck /proc/sys/kernel/perf_event_max_sample_rate.\n"
1765 "Hint:\tThe current value is %d and %" PRIu64
" is being requested.",
1766 emsg
, max_freq
, first
->attr
.sample_freq
);
1771 scnprintf(buf
, size
, "%s", emsg
);
1778 int perf_evlist__strerror_mmap(struct perf_evlist
*evlist
, int err
, char *buf
, size_t size
)
1780 char sbuf
[STRERR_BUFSIZE
], *emsg
= strerror_r(err
, sbuf
, sizeof(sbuf
));
1781 int pages_attempted
= evlist
->mmap_len
/ 1024, pages_max_per_user
, printed
= 0;
1785 sysctl__read_int("kernel/perf_event_mlock_kb", &pages_max_per_user
);
1786 printed
+= scnprintf(buf
+ printed
, size
- printed
,
1788 "Hint:\tCheck /proc/sys/kernel/perf_event_mlock_kb (%d kB) setting.\n"
1789 "Hint:\tTried using %zd kB.\n",
1790 emsg
, pages_max_per_user
, pages_attempted
);
1792 if (pages_attempted
>= pages_max_per_user
) {
1793 printed
+= scnprintf(buf
+ printed
, size
- printed
,
1794 "Hint:\tTry 'sudo sh -c \"echo %d > /proc/sys/kernel/perf_event_mlock_kb\"', or\n",
1795 pages_max_per_user
+ pages_attempted
);
1798 printed
+= scnprintf(buf
+ printed
, size
- printed
,
1799 "Hint:\tTry using a smaller -m/--mmap-pages value.");
1802 scnprintf(buf
, size
, "%s", emsg
);
1809 void perf_evlist__to_front(struct perf_evlist
*evlist
,
1810 struct perf_evsel
*move_evsel
)
1812 struct perf_evsel
*evsel
, *n
;
1815 if (move_evsel
== perf_evlist__first(evlist
))
1818 evlist__for_each_safe(evlist
, n
, evsel
) {
1819 if (evsel
->leader
== move_evsel
->leader
)
1820 list_move_tail(&evsel
->node
, &move
);
1823 list_splice(&move
, &evlist
->entries
);
1826 void perf_evlist__set_tracking_event(struct perf_evlist
*evlist
,
1827 struct perf_evsel
*tracking_evsel
)
1829 struct perf_evsel
*evsel
;
1831 if (tracking_evsel
->tracking
)
1834 evlist__for_each(evlist
, evsel
) {
1835 if (evsel
!= tracking_evsel
)
1836 evsel
->tracking
= false;
1839 tracking_evsel
->tracking
= true;
1843 perf_evlist__find_evsel_by_str(struct perf_evlist
*evlist
,
1846 struct perf_evsel
*evsel
;
1848 evlist__for_each(evlist
, evsel
) {
1851 if (strcmp(str
, evsel
->name
) == 0)