2027 lines
46 KiB
C
2027 lines
46 KiB
C
/*
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* Copyright (C) 2011, Red Hat Inc, Arnaldo Carvalho de Melo <acme@redhat.com>
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*
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* Parts came from builtin-{top,stat,record}.c, see those files for further
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* copyright notes.
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*
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* Released under the GPL v2. (and only v2, not any later version)
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*/
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#include "util.h"
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#include <api/fs/fs.h>
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#include <poll.h>
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#include "cpumap.h"
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#include "thread_map.h"
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#include "target.h"
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#include "evlist.h"
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#include "evsel.h"
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#include "debug.h"
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#include "asm/bug.h"
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#include <unistd.h>
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#include "parse-events.h"
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#include <subcmd/parse-options.h>
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#include <sys/mman.h>
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#include <linux/bitops.h>
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#include <linux/hash.h>
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#include <linux/log2.h>
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#include <linux/err.h>
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static void perf_mmap__munmap(struct perf_mmap *map);
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static void perf_mmap__put(struct perf_mmap *map);
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#define FD(e, x, y) (*(int *)xyarray__entry(e->fd, x, y))
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#define SID(e, x, y) xyarray__entry(e->sample_id, x, y)
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void perf_evlist__init(struct perf_evlist *evlist, struct cpu_map *cpus,
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struct thread_map *threads)
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{
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int i;
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for (i = 0; i < PERF_EVLIST__HLIST_SIZE; ++i)
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INIT_HLIST_HEAD(&evlist->heads[i]);
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INIT_LIST_HEAD(&evlist->entries);
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perf_evlist__set_maps(evlist, cpus, threads);
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fdarray__init(&evlist->pollfd, 64);
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evlist->workload.pid = -1;
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evlist->bkw_mmap_state = BKW_MMAP_NOTREADY;
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}
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struct perf_evlist *perf_evlist__new(void)
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{
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struct perf_evlist *evlist = zalloc(sizeof(*evlist));
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if (evlist != NULL)
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perf_evlist__init(evlist, NULL, NULL);
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return evlist;
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}
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struct perf_evlist *perf_evlist__new_default(void)
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{
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struct perf_evlist *evlist = perf_evlist__new();
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if (evlist && perf_evlist__add_default(evlist)) {
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perf_evlist__delete(evlist);
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evlist = NULL;
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}
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return evlist;
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}
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struct perf_evlist *perf_evlist__new_dummy(void)
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{
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struct perf_evlist *evlist = perf_evlist__new();
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if (evlist && perf_evlist__add_dummy(evlist)) {
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perf_evlist__delete(evlist);
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evlist = NULL;
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}
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return evlist;
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}
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/**
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* perf_evlist__set_id_pos - set the positions of event ids.
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* @evlist: selected event list
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*
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* Events with compatible sample types all have the same id_pos
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* and is_pos. For convenience, put a copy on evlist.
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*/
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void perf_evlist__set_id_pos(struct perf_evlist *evlist)
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{
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struct perf_evsel *first = perf_evlist__first(evlist);
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evlist->id_pos = first->id_pos;
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evlist->is_pos = first->is_pos;
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}
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static void perf_evlist__update_id_pos(struct perf_evlist *evlist)
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{
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struct perf_evsel *evsel;
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evlist__for_each_entry(evlist, evsel)
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perf_evsel__calc_id_pos(evsel);
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perf_evlist__set_id_pos(evlist);
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}
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static void perf_evlist__purge(struct perf_evlist *evlist)
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{
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struct perf_evsel *pos, *n;
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evlist__for_each_entry_safe(evlist, n, pos) {
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list_del_init(&pos->node);
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pos->evlist = NULL;
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perf_evsel__delete(pos);
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}
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evlist->nr_entries = 0;
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}
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void perf_evlist__exit(struct perf_evlist *evlist)
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{
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zfree(&evlist->mmap);
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zfree(&evlist->backward_mmap);
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fdarray__exit(&evlist->pollfd);
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}
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void perf_evlist__delete(struct perf_evlist *evlist)
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{
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if (evlist == NULL)
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return;
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perf_evlist__munmap(evlist);
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perf_evlist__close(evlist);
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cpu_map__put(evlist->cpus);
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thread_map__put(evlist->threads);
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evlist->cpus = NULL;
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evlist->threads = NULL;
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perf_evlist__purge(evlist);
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perf_evlist__exit(evlist);
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free(evlist);
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}
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static void __perf_evlist__propagate_maps(struct perf_evlist *evlist,
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struct perf_evsel *evsel)
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{
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/*
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* We already have cpus for evsel (via PMU sysfs) so
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* keep it, if there's no target cpu list defined.
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*/
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if (!evsel->own_cpus || evlist->has_user_cpus) {
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cpu_map__put(evsel->cpus);
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evsel->cpus = cpu_map__get(evlist->cpus);
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} else if (evsel->cpus != evsel->own_cpus) {
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cpu_map__put(evsel->cpus);
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evsel->cpus = cpu_map__get(evsel->own_cpus);
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}
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thread_map__put(evsel->threads);
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evsel->threads = thread_map__get(evlist->threads);
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}
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static void perf_evlist__propagate_maps(struct perf_evlist *evlist)
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{
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struct perf_evsel *evsel;
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evlist__for_each_entry(evlist, evsel)
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__perf_evlist__propagate_maps(evlist, evsel);
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}
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void perf_evlist__add(struct perf_evlist *evlist, struct perf_evsel *entry)
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{
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entry->evlist = evlist;
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list_add_tail(&entry->node, &evlist->entries);
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entry->idx = evlist->nr_entries;
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entry->tracking = !entry->idx;
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if (!evlist->nr_entries++)
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perf_evlist__set_id_pos(evlist);
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__perf_evlist__propagate_maps(evlist, entry);
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}
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void perf_evlist__remove(struct perf_evlist *evlist, struct perf_evsel *evsel)
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{
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evsel->evlist = NULL;
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list_del_init(&evsel->node);
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evlist->nr_entries -= 1;
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}
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void perf_evlist__splice_list_tail(struct perf_evlist *evlist,
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struct list_head *list)
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{
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struct perf_evsel *evsel, *temp;
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__evlist__for_each_entry_safe(list, temp, evsel) {
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list_del_init(&evsel->node);
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perf_evlist__add(evlist, evsel);
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}
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}
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void __perf_evlist__set_leader(struct list_head *list)
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{
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struct perf_evsel *evsel, *leader;
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leader = list_entry(list->next, struct perf_evsel, node);
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evsel = list_entry(list->prev, struct perf_evsel, node);
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leader->nr_members = evsel->idx - leader->idx + 1;
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__evlist__for_each_entry(list, evsel) {
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evsel->leader = leader;
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}
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}
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void perf_evlist__set_leader(struct perf_evlist *evlist)
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{
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if (evlist->nr_entries) {
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evlist->nr_groups = evlist->nr_entries > 1 ? 1 : 0;
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__perf_evlist__set_leader(&evlist->entries);
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}
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}
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void perf_event_attr__set_max_precise_ip(struct perf_event_attr *attr)
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{
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attr->precise_ip = 3;
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while (attr->precise_ip != 0) {
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int fd = sys_perf_event_open(attr, 0, -1, -1, 0);
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if (fd != -1) {
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close(fd);
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break;
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}
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--attr->precise_ip;
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}
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}
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int perf_evlist__add_default(struct perf_evlist *evlist)
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{
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struct perf_evsel *evsel = perf_evsel__new_cycles();
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if (evsel == NULL)
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return -ENOMEM;
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perf_evlist__add(evlist, evsel);
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return 0;
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}
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int perf_evlist__add_dummy(struct perf_evlist *evlist)
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{
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struct perf_event_attr attr = {
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.type = PERF_TYPE_SOFTWARE,
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.config = PERF_COUNT_SW_DUMMY,
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.size = sizeof(attr), /* to capture ABI version */
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};
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struct perf_evsel *evsel = perf_evsel__new(&attr);
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if (evsel == NULL)
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return -ENOMEM;
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perf_evlist__add(evlist, evsel);
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return 0;
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}
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static int perf_evlist__add_attrs(struct perf_evlist *evlist,
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struct perf_event_attr *attrs, size_t nr_attrs)
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{
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struct perf_evsel *evsel, *n;
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LIST_HEAD(head);
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size_t i;
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for (i = 0; i < nr_attrs; i++) {
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evsel = perf_evsel__new_idx(attrs + i, evlist->nr_entries + i);
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if (evsel == NULL)
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goto out_delete_partial_list;
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list_add_tail(&evsel->node, &head);
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}
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perf_evlist__splice_list_tail(evlist, &head);
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return 0;
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out_delete_partial_list:
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__evlist__for_each_entry_safe(&head, n, evsel)
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perf_evsel__delete(evsel);
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return -1;
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}
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int __perf_evlist__add_default_attrs(struct perf_evlist *evlist,
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struct perf_event_attr *attrs, size_t nr_attrs)
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{
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size_t i;
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for (i = 0; i < nr_attrs; i++)
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event_attr_init(attrs + i);
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return perf_evlist__add_attrs(evlist, attrs, nr_attrs);
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}
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struct perf_evsel *
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perf_evlist__find_tracepoint_by_id(struct perf_evlist *evlist, int id)
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{
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struct perf_evsel *evsel;
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evlist__for_each_entry(evlist, evsel) {
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if (evsel->attr.type == PERF_TYPE_TRACEPOINT &&
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(int)evsel->attr.config == id)
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return evsel;
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}
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return NULL;
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}
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struct perf_evsel *
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perf_evlist__find_tracepoint_by_name(struct perf_evlist *evlist,
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const char *name)
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{
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struct perf_evsel *evsel;
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evlist__for_each_entry(evlist, evsel) {
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if ((evsel->attr.type == PERF_TYPE_TRACEPOINT) &&
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(strcmp(evsel->name, name) == 0))
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return evsel;
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}
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return NULL;
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}
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int perf_evlist__add_newtp(struct perf_evlist *evlist,
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const char *sys, const char *name, void *handler)
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{
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struct perf_evsel *evsel = perf_evsel__newtp(sys, name);
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if (IS_ERR(evsel))
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return -1;
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evsel->handler = handler;
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perf_evlist__add(evlist, evsel);
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return 0;
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}
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static int perf_evlist__nr_threads(struct perf_evlist *evlist,
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struct perf_evsel *evsel)
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{
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if (evsel->system_wide)
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return 1;
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else
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return thread_map__nr(evlist->threads);
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}
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void perf_evlist__disable(struct perf_evlist *evlist)
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{
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struct perf_evsel *pos;
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evlist__for_each_entry(evlist, pos) {
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if (!perf_evsel__is_group_leader(pos) || !pos->fd)
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continue;
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perf_evsel__disable(pos);
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}
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evlist->enabled = false;
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}
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void perf_evlist__enable(struct perf_evlist *evlist)
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{
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struct perf_evsel *pos;
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evlist__for_each_entry(evlist, pos) {
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if (!perf_evsel__is_group_leader(pos) || !pos->fd)
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continue;
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perf_evsel__enable(pos);
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}
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evlist->enabled = true;
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}
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void perf_evlist__toggle_enable(struct perf_evlist *evlist)
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{
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(evlist->enabled ? perf_evlist__disable : perf_evlist__enable)(evlist);
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}
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static int perf_evlist__enable_event_cpu(struct perf_evlist *evlist,
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struct perf_evsel *evsel, int cpu)
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{
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int thread;
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int nr_threads = perf_evlist__nr_threads(evlist, evsel);
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if (!evsel->fd)
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return -EINVAL;
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for (thread = 0; thread < nr_threads; thread++) {
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int err = ioctl(FD(evsel, cpu, thread), PERF_EVENT_IOC_ENABLE, 0);
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if (err)
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return err;
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}
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return 0;
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}
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static int perf_evlist__enable_event_thread(struct perf_evlist *evlist,
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struct perf_evsel *evsel,
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int thread)
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{
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int cpu;
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int nr_cpus = cpu_map__nr(evlist->cpus);
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if (!evsel->fd)
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return -EINVAL;
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for (cpu = 0; cpu < nr_cpus; cpu++) {
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int err = ioctl(FD(evsel, cpu, thread), PERF_EVENT_IOC_ENABLE, 0);
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if (err)
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return err;
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}
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return 0;
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}
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int perf_evlist__enable_event_idx(struct perf_evlist *evlist,
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struct perf_evsel *evsel, int idx)
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{
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bool per_cpu_mmaps = !cpu_map__empty(evlist->cpus);
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if (per_cpu_mmaps)
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return perf_evlist__enable_event_cpu(evlist, evsel, idx);
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else
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return perf_evlist__enable_event_thread(evlist, evsel, idx);
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}
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int perf_evlist__alloc_pollfd(struct perf_evlist *evlist)
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{
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int nr_cpus = cpu_map__nr(evlist->cpus);
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int nr_threads = thread_map__nr(evlist->threads);
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int nfds = 0;
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struct perf_evsel *evsel;
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evlist__for_each_entry(evlist, evsel) {
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if (evsel->system_wide)
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nfds += nr_cpus;
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else
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nfds += nr_cpus * nr_threads;
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}
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if (fdarray__available_entries(&evlist->pollfd) < nfds &&
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fdarray__grow(&evlist->pollfd, nfds) < 0)
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return -ENOMEM;
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return 0;
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}
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static int __perf_evlist__add_pollfd(struct perf_evlist *evlist, int fd,
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struct perf_mmap *map, short revent)
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{
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int pos = fdarray__add(&evlist->pollfd, fd, revent | POLLERR | POLLHUP);
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/*
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* Save the idx so that when we filter out fds POLLHUP'ed we can
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* close the associated evlist->mmap[] entry.
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*/
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if (pos >= 0) {
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evlist->pollfd.priv[pos].ptr = map;
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fcntl(fd, F_SETFL, O_NONBLOCK);
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}
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return pos;
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}
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int perf_evlist__add_pollfd(struct perf_evlist *evlist, int fd)
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{
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return __perf_evlist__add_pollfd(evlist, fd, NULL, POLLIN);
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}
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static void perf_evlist__munmap_filtered(struct fdarray *fda, int fd,
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void *arg __maybe_unused)
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{
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struct perf_mmap *map = fda->priv[fd].ptr;
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if (map)
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perf_mmap__put(map);
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}
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int perf_evlist__filter_pollfd(struct perf_evlist *evlist, short revents_and_mask)
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{
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return fdarray__filter(&evlist->pollfd, revents_and_mask,
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perf_evlist__munmap_filtered, NULL);
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}
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int perf_evlist__poll(struct perf_evlist *evlist, int timeout)
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{
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return fdarray__poll(&evlist->pollfd, timeout);
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}
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static void perf_evlist__id_hash(struct perf_evlist *evlist,
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struct perf_evsel *evsel,
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int cpu, int thread, u64 id)
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{
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int hash;
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struct perf_sample_id *sid = SID(evsel, cpu, thread);
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sid->id = id;
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sid->evsel = evsel;
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hash = hash_64(sid->id, PERF_EVLIST__HLIST_BITS);
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hlist_add_head(&sid->node, &evlist->heads[hash]);
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}
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void perf_evlist__id_add(struct perf_evlist *evlist, struct perf_evsel *evsel,
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int cpu, int thread, u64 id)
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{
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perf_evlist__id_hash(evlist, evsel, cpu, thread, id);
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evsel->id[evsel->ids++] = id;
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}
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|
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int perf_evlist__id_add_fd(struct perf_evlist *evlist,
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struct perf_evsel *evsel,
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int cpu, int thread, int fd)
|
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{
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u64 read_data[4] = { 0, };
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int id_idx = 1; /* The first entry is the counter value */
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u64 id;
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int ret;
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ret = ioctl(fd, PERF_EVENT_IOC_ID, &id);
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if (!ret)
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goto add;
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|
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if (errno != ENOTTY)
|
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return -1;
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|
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/* Legacy way to get event id.. All hail to old kernels! */
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|
|
/*
|
|
* This way does not work with group format read, so bail
|
|
* out in that case.
|
|
*/
|
|
if (perf_evlist__read_format(evlist) & PERF_FORMAT_GROUP)
|
|
return -1;
|
|
|
|
if (!(evsel->attr.read_format & PERF_FORMAT_ID) ||
|
|
read(fd, &read_data, sizeof(read_data)) == -1)
|
|
return -1;
|
|
|
|
if (evsel->attr.read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
|
|
++id_idx;
|
|
if (evsel->attr.read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
|
|
++id_idx;
|
|
|
|
id = read_data[id_idx];
|
|
|
|
add:
|
|
perf_evlist__id_add(evlist, evsel, cpu, thread, id);
|
|
return 0;
|
|
}
|
|
|
|
static void perf_evlist__set_sid_idx(struct perf_evlist *evlist,
|
|
struct perf_evsel *evsel, int idx, int cpu,
|
|
int thread)
|
|
{
|
|
struct perf_sample_id *sid = SID(evsel, cpu, thread);
|
|
sid->idx = idx;
|
|
if (evlist->cpus && cpu >= 0)
|
|
sid->cpu = evlist->cpus->map[cpu];
|
|
else
|
|
sid->cpu = -1;
|
|
if (!evsel->system_wide && evlist->threads && thread >= 0)
|
|
sid->tid = thread_map__pid(evlist->threads, thread);
|
|
else
|
|
sid->tid = -1;
|
|
}
|
|
|
|
struct perf_sample_id *perf_evlist__id2sid(struct perf_evlist *evlist, u64 id)
|
|
{
|
|
struct hlist_head *head;
|
|
struct perf_sample_id *sid;
|
|
int hash;
|
|
|
|
hash = hash_64(id, PERF_EVLIST__HLIST_BITS);
|
|
head = &evlist->heads[hash];
|
|
|
|
hlist_for_each_entry(sid, head, node)
|
|
if (sid->id == id)
|
|
return sid;
|
|
|
|
return NULL;
|
|
}
|
|
|
|
struct perf_evsel *perf_evlist__id2evsel(struct perf_evlist *evlist, u64 id)
|
|
{
|
|
struct perf_sample_id *sid;
|
|
|
|
if (evlist->nr_entries == 1 || !id)
|
|
return perf_evlist__first(evlist);
|
|
|
|
sid = perf_evlist__id2sid(evlist, id);
|
|
if (sid)
|
|
return sid->evsel;
|
|
|
|
if (!perf_evlist__sample_id_all(evlist))
|
|
return perf_evlist__first(evlist);
|
|
|
|
return NULL;
|
|
}
|
|
|
|
struct perf_evsel *perf_evlist__id2evsel_strict(struct perf_evlist *evlist,
|
|
u64 id)
|
|
{
|
|
struct perf_sample_id *sid;
|
|
|
|
if (!id)
|
|
return NULL;
|
|
|
|
sid = perf_evlist__id2sid(evlist, id);
|
|
if (sid)
|
|
return sid->evsel;
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static int perf_evlist__event2id(struct perf_evlist *evlist,
|
|
union perf_event *event, u64 *id)
|
|
{
|
|
const u64 *array = event->sample.array;
|
|
ssize_t n;
|
|
|
|
n = (event->header.size - sizeof(event->header)) >> 3;
|
|
|
|
if (event->header.type == PERF_RECORD_SAMPLE) {
|
|
if (evlist->id_pos >= n)
|
|
return -1;
|
|
*id = array[evlist->id_pos];
|
|
} else {
|
|
if (evlist->is_pos > n)
|
|
return -1;
|
|
n -= evlist->is_pos;
|
|
*id = array[n];
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
struct perf_evsel *perf_evlist__event2evsel(struct perf_evlist *evlist,
|
|
union perf_event *event)
|
|
{
|
|
struct perf_evsel *first = perf_evlist__first(evlist);
|
|
struct hlist_head *head;
|
|
struct perf_sample_id *sid;
|
|
int hash;
|
|
u64 id;
|
|
|
|
if (evlist->nr_entries == 1)
|
|
return first;
|
|
|
|
if (!first->attr.sample_id_all &&
|
|
event->header.type != PERF_RECORD_SAMPLE)
|
|
return first;
|
|
|
|
if (perf_evlist__event2id(evlist, event, &id))
|
|
return NULL;
|
|
|
|
/* Synthesized events have an id of zero */
|
|
if (!id)
|
|
return first;
|
|
|
|
hash = hash_64(id, PERF_EVLIST__HLIST_BITS);
|
|
head = &evlist->heads[hash];
|
|
|
|
hlist_for_each_entry(sid, head, node) {
|
|
if (sid->id == id)
|
|
return sid->evsel;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static int perf_evlist__set_paused(struct perf_evlist *evlist, bool value)
|
|
{
|
|
int i;
|
|
|
|
if (!evlist->backward_mmap)
|
|
return 0;
|
|
|
|
for (i = 0; i < evlist->nr_mmaps; i++) {
|
|
int fd = evlist->backward_mmap[i].fd;
|
|
int err;
|
|
|
|
if (fd < 0)
|
|
continue;
|
|
err = ioctl(fd, PERF_EVENT_IOC_PAUSE_OUTPUT, value ? 1 : 0);
|
|
if (err)
|
|
return err;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int perf_evlist__pause(struct perf_evlist *evlist)
|
|
{
|
|
return perf_evlist__set_paused(evlist, true);
|
|
}
|
|
|
|
static int perf_evlist__resume(struct perf_evlist *evlist)
|
|
{
|
|
return perf_evlist__set_paused(evlist, false);
|
|
}
|
|
|
|
/* When check_messup is true, 'end' must points to a good entry */
|
|
static union perf_event *
|
|
perf_mmap__read(struct perf_mmap *md, bool check_messup, u64 start,
|
|
u64 end, u64 *prev)
|
|
{
|
|
unsigned char *data = md->base + page_size;
|
|
union perf_event *event = NULL;
|
|
int diff = end - start;
|
|
|
|
if (check_messup) {
|
|
/*
|
|
* If we're further behind than half the buffer, there's a chance
|
|
* the writer will bite our tail and mess up the samples under us.
|
|
*
|
|
* If we somehow ended up ahead of the 'end', we got messed up.
|
|
*
|
|
* In either case, truncate and restart at 'end'.
|
|
*/
|
|
if (diff > md->mask / 2 || diff < 0) {
|
|
fprintf(stderr, "WARNING: failed to keep up with mmap data.\n");
|
|
|
|
/*
|
|
* 'end' points to a known good entry, start there.
|
|
*/
|
|
start = end;
|
|
diff = 0;
|
|
}
|
|
}
|
|
|
|
if (diff >= (int)sizeof(event->header)) {
|
|
size_t size;
|
|
|
|
event = (union perf_event *)&data[start & md->mask];
|
|
size = event->header.size;
|
|
|
|
if (size < sizeof(event->header) || diff < (int)size) {
|
|
event = NULL;
|
|
goto broken_event;
|
|
}
|
|
|
|
/*
|
|
* Event straddles the mmap boundary -- header should always
|
|
* be inside due to u64 alignment of output.
|
|
*/
|
|
if ((start & md->mask) + size != ((start + size) & md->mask)) {
|
|
unsigned int offset = start;
|
|
unsigned int len = min(sizeof(*event), size), cpy;
|
|
void *dst = md->event_copy;
|
|
|
|
do {
|
|
cpy = min(md->mask + 1 - (offset & md->mask), len);
|
|
memcpy(dst, &data[offset & md->mask], cpy);
|
|
offset += cpy;
|
|
dst += cpy;
|
|
len -= cpy;
|
|
} while (len);
|
|
|
|
event = (union perf_event *) md->event_copy;
|
|
}
|
|
|
|
start += size;
|
|
}
|
|
|
|
broken_event:
|
|
if (prev)
|
|
*prev = start;
|
|
|
|
return event;
|
|
}
|
|
|
|
union perf_event *perf_mmap__read_forward(struct perf_mmap *md, bool check_messup)
|
|
{
|
|
u64 head;
|
|
u64 old = md->prev;
|
|
|
|
/*
|
|
* Check if event was unmapped due to a POLLHUP/POLLERR.
|
|
*/
|
|
if (!refcount_read(&md->refcnt))
|
|
return NULL;
|
|
|
|
head = perf_mmap__read_head(md);
|
|
|
|
return perf_mmap__read(md, check_messup, old, head, &md->prev);
|
|
}
|
|
|
|
union perf_event *
|
|
perf_mmap__read_backward(struct perf_mmap *md)
|
|
{
|
|
u64 head, end;
|
|
u64 start = md->prev;
|
|
|
|
/*
|
|
* Check if event was unmapped due to a POLLHUP/POLLERR.
|
|
*/
|
|
if (!refcount_read(&md->refcnt))
|
|
return NULL;
|
|
|
|
head = perf_mmap__read_head(md);
|
|
if (!head)
|
|
return NULL;
|
|
|
|
/*
|
|
* 'head' pointer starts from 0. Kernel minus sizeof(record) form
|
|
* it each time when kernel writes to it, so in fact 'head' is
|
|
* negative. 'end' pointer is made manually by adding the size of
|
|
* the ring buffer to 'head' pointer, means the validate data can
|
|
* read is the whole ring buffer. If 'end' is positive, the ring
|
|
* buffer has not fully filled, so we must adjust 'end' to 0.
|
|
*
|
|
* However, since both 'head' and 'end' is unsigned, we can't
|
|
* simply compare 'end' against 0. Here we compare '-head' and
|
|
* the size of the ring buffer, where -head is the number of bytes
|
|
* kernel write to the ring buffer.
|
|
*/
|
|
if (-head < (u64)(md->mask + 1))
|
|
end = 0;
|
|
else
|
|
end = head + md->mask + 1;
|
|
|
|
return perf_mmap__read(md, false, start, end, &md->prev);
|
|
}
|
|
|
|
union perf_event *perf_evlist__mmap_read_forward(struct perf_evlist *evlist, int idx)
|
|
{
|
|
struct perf_mmap *md = &evlist->mmap[idx];
|
|
|
|
/*
|
|
* Check messup is required for forward overwritable ring buffer:
|
|
* memory pointed by md->prev can be overwritten in this case.
|
|
* No need for read-write ring buffer: kernel stop outputting when
|
|
* it hit md->prev (perf_mmap__consume()).
|
|
*/
|
|
return perf_mmap__read_forward(md, evlist->overwrite);
|
|
}
|
|
|
|
union perf_event *perf_evlist__mmap_read_backward(struct perf_evlist *evlist, int idx)
|
|
{
|
|
struct perf_mmap *md = &evlist->mmap[idx];
|
|
|
|
/*
|
|
* No need to check messup for backward ring buffer:
|
|
* We can always read arbitrary long data from a backward
|
|
* ring buffer unless we forget to pause it before reading.
|
|
*/
|
|
return perf_mmap__read_backward(md);
|
|
}
|
|
|
|
union perf_event *perf_evlist__mmap_read(struct perf_evlist *evlist, int idx)
|
|
{
|
|
return perf_evlist__mmap_read_forward(evlist, idx);
|
|
}
|
|
|
|
void perf_mmap__read_catchup(struct perf_mmap *md)
|
|
{
|
|
u64 head;
|
|
|
|
if (!refcount_read(&md->refcnt))
|
|
return;
|
|
|
|
head = perf_mmap__read_head(md);
|
|
md->prev = head;
|
|
}
|
|
|
|
void perf_evlist__mmap_read_catchup(struct perf_evlist *evlist, int idx)
|
|
{
|
|
perf_mmap__read_catchup(&evlist->mmap[idx]);
|
|
}
|
|
|
|
static bool perf_mmap__empty(struct perf_mmap *md)
|
|
{
|
|
return perf_mmap__read_head(md) == md->prev && !md->auxtrace_mmap.base;
|
|
}
|
|
|
|
static void perf_mmap__get(struct perf_mmap *map)
|
|
{
|
|
refcount_inc(&map->refcnt);
|
|
}
|
|
|
|
static void perf_mmap__put(struct perf_mmap *md)
|
|
{
|
|
BUG_ON(md->base && refcount_read(&md->refcnt) == 0);
|
|
|
|
if (refcount_dec_and_test(&md->refcnt))
|
|
perf_mmap__munmap(md);
|
|
}
|
|
|
|
void perf_mmap__consume(struct perf_mmap *md, bool overwrite)
|
|
{
|
|
if (!overwrite) {
|
|
u64 old = md->prev;
|
|
|
|
perf_mmap__write_tail(md, old);
|
|
}
|
|
|
|
if (refcount_read(&md->refcnt) == 1 && perf_mmap__empty(md))
|
|
perf_mmap__put(md);
|
|
}
|
|
|
|
void perf_evlist__mmap_consume(struct perf_evlist *evlist, int idx)
|
|
{
|
|
perf_mmap__consume(&evlist->mmap[idx], evlist->overwrite);
|
|
}
|
|
|
|
int __weak auxtrace_mmap__mmap(struct auxtrace_mmap *mm __maybe_unused,
|
|
struct auxtrace_mmap_params *mp __maybe_unused,
|
|
void *userpg __maybe_unused,
|
|
int fd __maybe_unused)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
void __weak auxtrace_mmap__munmap(struct auxtrace_mmap *mm __maybe_unused)
|
|
{
|
|
}
|
|
|
|
void __weak auxtrace_mmap_params__init(
|
|
struct auxtrace_mmap_params *mp __maybe_unused,
|
|
off_t auxtrace_offset __maybe_unused,
|
|
unsigned int auxtrace_pages __maybe_unused,
|
|
bool auxtrace_overwrite __maybe_unused)
|
|
{
|
|
}
|
|
|
|
void __weak auxtrace_mmap_params__set_idx(
|
|
struct auxtrace_mmap_params *mp __maybe_unused,
|
|
struct perf_evlist *evlist __maybe_unused,
|
|
int idx __maybe_unused,
|
|
bool per_cpu __maybe_unused)
|
|
{
|
|
}
|
|
|
|
static void perf_mmap__munmap(struct perf_mmap *map)
|
|
{
|
|
if (map->base != NULL) {
|
|
munmap(map->base, perf_mmap__mmap_len(map));
|
|
map->base = NULL;
|
|
map->fd = -1;
|
|
refcount_set(&map->refcnt, 0);
|
|
}
|
|
auxtrace_mmap__munmap(&map->auxtrace_mmap);
|
|
}
|
|
|
|
static void perf_evlist__munmap_nofree(struct perf_evlist *evlist)
|
|
{
|
|
int i;
|
|
|
|
if (evlist->mmap)
|
|
for (i = 0; i < evlist->nr_mmaps; i++)
|
|
perf_mmap__munmap(&evlist->mmap[i]);
|
|
|
|
if (evlist->backward_mmap)
|
|
for (i = 0; i < evlist->nr_mmaps; i++)
|
|
perf_mmap__munmap(&evlist->backward_mmap[i]);
|
|
}
|
|
|
|
void perf_evlist__munmap(struct perf_evlist *evlist)
|
|
{
|
|
perf_evlist__munmap_nofree(evlist);
|
|
zfree(&evlist->mmap);
|
|
zfree(&evlist->backward_mmap);
|
|
}
|
|
|
|
static struct perf_mmap *perf_evlist__alloc_mmap(struct perf_evlist *evlist)
|
|
{
|
|
int i;
|
|
struct perf_mmap *map;
|
|
|
|
evlist->nr_mmaps = cpu_map__nr(evlist->cpus);
|
|
if (cpu_map__empty(evlist->cpus))
|
|
evlist->nr_mmaps = thread_map__nr(evlist->threads);
|
|
map = zalloc(evlist->nr_mmaps * sizeof(struct perf_mmap));
|
|
if (!map)
|
|
return NULL;
|
|
|
|
for (i = 0; i < evlist->nr_mmaps; i++)
|
|
map[i].fd = -1;
|
|
return map;
|
|
}
|
|
|
|
struct mmap_params {
|
|
int prot;
|
|
int mask;
|
|
struct auxtrace_mmap_params auxtrace_mp;
|
|
};
|
|
|
|
static int perf_mmap__mmap(struct perf_mmap *map,
|
|
struct mmap_params *mp, int fd)
|
|
{
|
|
/*
|
|
* The last one will be done at perf_evlist__mmap_consume(), so that we
|
|
* make sure we don't prevent tools from consuming every last event in
|
|
* the ring buffer.
|
|
*
|
|
* I.e. we can get the POLLHUP meaning that the fd doesn't exist
|
|
* anymore, but the last events for it are still in the ring buffer,
|
|
* waiting to be consumed.
|
|
*
|
|
* Tools can chose to ignore this at their own discretion, but the
|
|
* evlist layer can't just drop it when filtering events in
|
|
* perf_evlist__filter_pollfd().
|
|
*/
|
|
refcount_set(&map->refcnt, 2);
|
|
map->prev = 0;
|
|
map->mask = mp->mask;
|
|
map->base = mmap(NULL, perf_mmap__mmap_len(map), mp->prot,
|
|
MAP_SHARED, fd, 0);
|
|
if (map->base == MAP_FAILED) {
|
|
pr_debug2("failed to mmap perf event ring buffer, error %d\n",
|
|
errno);
|
|
map->base = NULL;
|
|
return -1;
|
|
}
|
|
map->fd = fd;
|
|
|
|
if (auxtrace_mmap__mmap(&map->auxtrace_mmap,
|
|
&mp->auxtrace_mp, map->base, fd))
|
|
return -1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static bool
|
|
perf_evlist__should_poll(struct perf_evlist *evlist __maybe_unused,
|
|
struct perf_evsel *evsel)
|
|
{
|
|
if (evsel->attr.write_backward)
|
|
return false;
|
|
return true;
|
|
}
|
|
|
|
static int perf_evlist__mmap_per_evsel(struct perf_evlist *evlist, int idx,
|
|
struct mmap_params *mp, int cpu_idx,
|
|
int thread, int *_output, int *_output_backward)
|
|
{
|
|
struct perf_evsel *evsel;
|
|
int revent;
|
|
int evlist_cpu = cpu_map__cpu(evlist->cpus, cpu_idx);
|
|
|
|
evlist__for_each_entry(evlist, evsel) {
|
|
struct perf_mmap *maps = evlist->mmap;
|
|
int *output = _output;
|
|
int fd;
|
|
int cpu;
|
|
|
|
if (evsel->attr.write_backward) {
|
|
output = _output_backward;
|
|
maps = evlist->backward_mmap;
|
|
|
|
if (!maps) {
|
|
maps = perf_evlist__alloc_mmap(evlist);
|
|
if (!maps)
|
|
return -1;
|
|
evlist->backward_mmap = maps;
|
|
if (evlist->bkw_mmap_state == BKW_MMAP_NOTREADY)
|
|
perf_evlist__toggle_bkw_mmap(evlist, BKW_MMAP_RUNNING);
|
|
}
|
|
}
|
|
|
|
if (evsel->system_wide && thread)
|
|
continue;
|
|
|
|
cpu = cpu_map__idx(evsel->cpus, evlist_cpu);
|
|
if (cpu == -1)
|
|
continue;
|
|
|
|
fd = FD(evsel, cpu, thread);
|
|
|
|
if (*output == -1) {
|
|
*output = fd;
|
|
|
|
if (perf_mmap__mmap(&maps[idx], mp, *output) < 0)
|
|
return -1;
|
|
} else {
|
|
if (ioctl(fd, PERF_EVENT_IOC_SET_OUTPUT, *output) != 0)
|
|
return -1;
|
|
|
|
perf_mmap__get(&maps[idx]);
|
|
}
|
|
|
|
revent = perf_evlist__should_poll(evlist, evsel) ? POLLIN : 0;
|
|
|
|
/*
|
|
* The system_wide flag causes a selected event to be opened
|
|
* always without a pid. Consequently it will never get a
|
|
* POLLHUP, but it is used for tracking in combination with
|
|
* other events, so it should not need to be polled anyway.
|
|
* Therefore don't add it for polling.
|
|
*/
|
|
if (!evsel->system_wide &&
|
|
__perf_evlist__add_pollfd(evlist, fd, &maps[idx], revent) < 0) {
|
|
perf_mmap__put(&maps[idx]);
|
|
return -1;
|
|
}
|
|
|
|
if (evsel->attr.read_format & PERF_FORMAT_ID) {
|
|
if (perf_evlist__id_add_fd(evlist, evsel, cpu, thread,
|
|
fd) < 0)
|
|
return -1;
|
|
perf_evlist__set_sid_idx(evlist, evsel, idx, cpu,
|
|
thread);
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int perf_evlist__mmap_per_cpu(struct perf_evlist *evlist,
|
|
struct mmap_params *mp)
|
|
{
|
|
int cpu, thread;
|
|
int nr_cpus = cpu_map__nr(evlist->cpus);
|
|
int nr_threads = thread_map__nr(evlist->threads);
|
|
|
|
pr_debug2("perf event ring buffer mmapped per cpu\n");
|
|
for (cpu = 0; cpu < nr_cpus; cpu++) {
|
|
int output = -1;
|
|
int output_backward = -1;
|
|
|
|
auxtrace_mmap_params__set_idx(&mp->auxtrace_mp, evlist, cpu,
|
|
true);
|
|
|
|
for (thread = 0; thread < nr_threads; thread++) {
|
|
if (perf_evlist__mmap_per_evsel(evlist, cpu, mp, cpu,
|
|
thread, &output, &output_backward))
|
|
goto out_unmap;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
|
|
out_unmap:
|
|
perf_evlist__munmap_nofree(evlist);
|
|
return -1;
|
|
}
|
|
|
|
static int perf_evlist__mmap_per_thread(struct perf_evlist *evlist,
|
|
struct mmap_params *mp)
|
|
{
|
|
int thread;
|
|
int nr_threads = thread_map__nr(evlist->threads);
|
|
|
|
pr_debug2("perf event ring buffer mmapped per thread\n");
|
|
for (thread = 0; thread < nr_threads; thread++) {
|
|
int output = -1;
|
|
int output_backward = -1;
|
|
|
|
auxtrace_mmap_params__set_idx(&mp->auxtrace_mp, evlist, thread,
|
|
false);
|
|
|
|
if (perf_evlist__mmap_per_evsel(evlist, thread, mp, 0, thread,
|
|
&output, &output_backward))
|
|
goto out_unmap;
|
|
}
|
|
|
|
return 0;
|
|
|
|
out_unmap:
|
|
perf_evlist__munmap_nofree(evlist);
|
|
return -1;
|
|
}
|
|
|
|
unsigned long perf_event_mlock_kb_in_pages(void)
|
|
{
|
|
unsigned long pages;
|
|
int max;
|
|
|
|
if (sysctl__read_int("kernel/perf_event_mlock_kb", &max) < 0) {
|
|
/*
|
|
* Pick a once upon a time good value, i.e. things look
|
|
* strange since we can't read a sysctl value, but lets not
|
|
* die yet...
|
|
*/
|
|
max = 512;
|
|
} else {
|
|
max -= (page_size / 1024);
|
|
}
|
|
|
|
pages = (max * 1024) / page_size;
|
|
if (!is_power_of_2(pages))
|
|
pages = rounddown_pow_of_two(pages);
|
|
|
|
return pages;
|
|
}
|
|
|
|
size_t perf_evlist__mmap_size(unsigned long pages)
|
|
{
|
|
if (pages == UINT_MAX)
|
|
pages = perf_event_mlock_kb_in_pages();
|
|
else if (!is_power_of_2(pages))
|
|
return 0;
|
|
|
|
return (pages + 1) * page_size;
|
|
}
|
|
|
|
static long parse_pages_arg(const char *str, unsigned long min,
|
|
unsigned long max)
|
|
{
|
|
unsigned long pages, val;
|
|
static struct parse_tag tags[] = {
|
|
{ .tag = 'B', .mult = 1 },
|
|
{ .tag = 'K', .mult = 1 << 10 },
|
|
{ .tag = 'M', .mult = 1 << 20 },
|
|
{ .tag = 'G', .mult = 1 << 30 },
|
|
{ .tag = 0 },
|
|
};
|
|
|
|
if (str == NULL)
|
|
return -EINVAL;
|
|
|
|
val = parse_tag_value(str, tags);
|
|
if (val != (unsigned long) -1) {
|
|
/* we got file size value */
|
|
pages = PERF_ALIGN(val, page_size) / page_size;
|
|
} else {
|
|
/* we got pages count value */
|
|
char *eptr;
|
|
pages = strtoul(str, &eptr, 10);
|
|
if (*eptr != '\0')
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (pages == 0 && min == 0) {
|
|
/* leave number of pages at 0 */
|
|
} else if (!is_power_of_2(pages)) {
|
|
char buf[100];
|
|
|
|
/* round pages up to next power of 2 */
|
|
pages = roundup_pow_of_two(pages);
|
|
if (!pages)
|
|
return -EINVAL;
|
|
|
|
unit_number__scnprintf(buf, sizeof(buf), pages * page_size);
|
|
pr_info("rounding mmap pages size to %s (%lu pages)\n",
|
|
buf, pages);
|
|
}
|
|
|
|
if (pages > max)
|
|
return -EINVAL;
|
|
|
|
return pages;
|
|
}
|
|
|
|
int __perf_evlist__parse_mmap_pages(unsigned int *mmap_pages, const char *str)
|
|
{
|
|
unsigned long max = UINT_MAX;
|
|
long pages;
|
|
|
|
if (max > SIZE_MAX / page_size)
|
|
max = SIZE_MAX / page_size;
|
|
|
|
pages = parse_pages_arg(str, 1, max);
|
|
if (pages < 0) {
|
|
pr_err("Invalid argument for --mmap_pages/-m\n");
|
|
return -1;
|
|
}
|
|
|
|
*mmap_pages = pages;
|
|
return 0;
|
|
}
|
|
|
|
int perf_evlist__parse_mmap_pages(const struct option *opt, const char *str,
|
|
int unset __maybe_unused)
|
|
{
|
|
return __perf_evlist__parse_mmap_pages(opt->value, str);
|
|
}
|
|
|
|
/**
|
|
* perf_evlist__mmap_ex - Create mmaps to receive events.
|
|
* @evlist: list of events
|
|
* @pages: map length in pages
|
|
* @overwrite: overwrite older events?
|
|
* @auxtrace_pages - auxtrace map length in pages
|
|
* @auxtrace_overwrite - overwrite older auxtrace data?
|
|
*
|
|
* If @overwrite is %false the user needs to signal event consumption using
|
|
* perf_mmap__write_tail(). Using perf_evlist__mmap_read() does this
|
|
* automatically.
|
|
*
|
|
* Similarly, if @auxtrace_overwrite is %false the user needs to signal data
|
|
* consumption using auxtrace_mmap__write_tail().
|
|
*
|
|
* Return: %0 on success, negative error code otherwise.
|
|
*/
|
|
int perf_evlist__mmap_ex(struct perf_evlist *evlist, unsigned int pages,
|
|
bool overwrite, unsigned int auxtrace_pages,
|
|
bool auxtrace_overwrite)
|
|
{
|
|
struct perf_evsel *evsel;
|
|
const struct cpu_map *cpus = evlist->cpus;
|
|
const struct thread_map *threads = evlist->threads;
|
|
struct mmap_params mp = {
|
|
.prot = PROT_READ | (overwrite ? 0 : PROT_WRITE),
|
|
};
|
|
|
|
if (!evlist->mmap)
|
|
evlist->mmap = perf_evlist__alloc_mmap(evlist);
|
|
if (!evlist->mmap)
|
|
return -ENOMEM;
|
|
|
|
if (evlist->pollfd.entries == NULL && perf_evlist__alloc_pollfd(evlist) < 0)
|
|
return -ENOMEM;
|
|
|
|
evlist->overwrite = overwrite;
|
|
evlist->mmap_len = perf_evlist__mmap_size(pages);
|
|
pr_debug("mmap size %zuB\n", evlist->mmap_len);
|
|
mp.mask = evlist->mmap_len - page_size - 1;
|
|
|
|
auxtrace_mmap_params__init(&mp.auxtrace_mp, evlist->mmap_len,
|
|
auxtrace_pages, auxtrace_overwrite);
|
|
|
|
evlist__for_each_entry(evlist, evsel) {
|
|
if ((evsel->attr.read_format & PERF_FORMAT_ID) &&
|
|
evsel->sample_id == NULL &&
|
|
perf_evsel__alloc_id(evsel, cpu_map__nr(cpus), threads->nr) < 0)
|
|
return -ENOMEM;
|
|
}
|
|
|
|
if (cpu_map__empty(cpus))
|
|
return perf_evlist__mmap_per_thread(evlist, &mp);
|
|
|
|
return perf_evlist__mmap_per_cpu(evlist, &mp);
|
|
}
|
|
|
|
int perf_evlist__mmap(struct perf_evlist *evlist, unsigned int pages,
|
|
bool overwrite)
|
|
{
|
|
return perf_evlist__mmap_ex(evlist, pages, overwrite, 0, false);
|
|
}
|
|
|
|
int perf_evlist__create_maps(struct perf_evlist *evlist, struct target *target)
|
|
{
|
|
struct cpu_map *cpus;
|
|
struct thread_map *threads;
|
|
|
|
threads = thread_map__new_str(target->pid, target->tid, target->uid);
|
|
|
|
if (!threads)
|
|
return -1;
|
|
|
|
if (target__uses_dummy_map(target))
|
|
cpus = cpu_map__dummy_new();
|
|
else
|
|
cpus = cpu_map__new(target->cpu_list);
|
|
|
|
if (!cpus)
|
|
goto out_delete_threads;
|
|
|
|
evlist->has_user_cpus = !!target->cpu_list;
|
|
|
|
perf_evlist__set_maps(evlist, cpus, threads);
|
|
|
|
return 0;
|
|
|
|
out_delete_threads:
|
|
thread_map__put(threads);
|
|
return -1;
|
|
}
|
|
|
|
void perf_evlist__set_maps(struct perf_evlist *evlist, struct cpu_map *cpus,
|
|
struct thread_map *threads)
|
|
{
|
|
/*
|
|
* Allow for the possibility that one or another of the maps isn't being
|
|
* changed i.e. don't put it. Note we are assuming the maps that are
|
|
* being applied are brand new and evlist is taking ownership of the
|
|
* original reference count of 1. If that is not the case it is up to
|
|
* the caller to increase the reference count.
|
|
*/
|
|
if (cpus != evlist->cpus) {
|
|
cpu_map__put(evlist->cpus);
|
|
evlist->cpus = cpu_map__get(cpus);
|
|
}
|
|
|
|
if (threads != evlist->threads) {
|
|
thread_map__put(evlist->threads);
|
|
evlist->threads = thread_map__get(threads);
|
|
}
|
|
|
|
perf_evlist__propagate_maps(evlist);
|
|
}
|
|
|
|
void __perf_evlist__set_sample_bit(struct perf_evlist *evlist,
|
|
enum perf_event_sample_format bit)
|
|
{
|
|
struct perf_evsel *evsel;
|
|
|
|
evlist__for_each_entry(evlist, evsel)
|
|
__perf_evsel__set_sample_bit(evsel, bit);
|
|
}
|
|
|
|
void __perf_evlist__reset_sample_bit(struct perf_evlist *evlist,
|
|
enum perf_event_sample_format bit)
|
|
{
|
|
struct perf_evsel *evsel;
|
|
|
|
evlist__for_each_entry(evlist, evsel)
|
|
__perf_evsel__reset_sample_bit(evsel, bit);
|
|
}
|
|
|
|
int perf_evlist__apply_filters(struct perf_evlist *evlist, struct perf_evsel **err_evsel)
|
|
{
|
|
struct perf_evsel *evsel;
|
|
int err = 0;
|
|
const int ncpus = cpu_map__nr(evlist->cpus),
|
|
nthreads = thread_map__nr(evlist->threads);
|
|
|
|
evlist__for_each_entry(evlist, evsel) {
|
|
if (evsel->filter == NULL)
|
|
continue;
|
|
|
|
/*
|
|
* filters only work for tracepoint event, which doesn't have cpu limit.
|
|
* So evlist and evsel should always be same.
|
|
*/
|
|
err = perf_evsel__apply_filter(evsel, ncpus, nthreads, evsel->filter);
|
|
if (err) {
|
|
*err_evsel = evsel;
|
|
break;
|
|
}
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
int perf_evlist__set_filter(struct perf_evlist *evlist, const char *filter)
|
|
{
|
|
struct perf_evsel *evsel;
|
|
int err = 0;
|
|
|
|
evlist__for_each_entry(evlist, evsel) {
|
|
if (evsel->attr.type != PERF_TYPE_TRACEPOINT)
|
|
continue;
|
|
|
|
err = perf_evsel__set_filter(evsel, filter);
|
|
if (err)
|
|
break;
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
int perf_evlist__set_filter_pids(struct perf_evlist *evlist, size_t npids, pid_t *pids)
|
|
{
|
|
char *filter;
|
|
int ret = -1;
|
|
size_t i;
|
|
|
|
for (i = 0; i < npids; ++i) {
|
|
if (i == 0) {
|
|
if (asprintf(&filter, "common_pid != %d", pids[i]) < 0)
|
|
return -1;
|
|
} else {
|
|
char *tmp;
|
|
|
|
if (asprintf(&tmp, "%s && common_pid != %d", filter, pids[i]) < 0)
|
|
goto out_free;
|
|
|
|
free(filter);
|
|
filter = tmp;
|
|
}
|
|
}
|
|
|
|
ret = perf_evlist__set_filter(evlist, filter);
|
|
out_free:
|
|
free(filter);
|
|
return ret;
|
|
}
|
|
|
|
int perf_evlist__set_filter_pid(struct perf_evlist *evlist, pid_t pid)
|
|
{
|
|
return perf_evlist__set_filter_pids(evlist, 1, &pid);
|
|
}
|
|
|
|
bool perf_evlist__valid_sample_type(struct perf_evlist *evlist)
|
|
{
|
|
struct perf_evsel *pos;
|
|
|
|
if (evlist->nr_entries == 1)
|
|
return true;
|
|
|
|
if (evlist->id_pos < 0 || evlist->is_pos < 0)
|
|
return false;
|
|
|
|
evlist__for_each_entry(evlist, pos) {
|
|
if (pos->id_pos != evlist->id_pos ||
|
|
pos->is_pos != evlist->is_pos)
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
u64 __perf_evlist__combined_sample_type(struct perf_evlist *evlist)
|
|
{
|
|
struct perf_evsel *evsel;
|
|
|
|
if (evlist->combined_sample_type)
|
|
return evlist->combined_sample_type;
|
|
|
|
evlist__for_each_entry(evlist, evsel)
|
|
evlist->combined_sample_type |= evsel->attr.sample_type;
|
|
|
|
return evlist->combined_sample_type;
|
|
}
|
|
|
|
u64 perf_evlist__combined_sample_type(struct perf_evlist *evlist)
|
|
{
|
|
evlist->combined_sample_type = 0;
|
|
return __perf_evlist__combined_sample_type(evlist);
|
|
}
|
|
|
|
u64 perf_evlist__combined_branch_type(struct perf_evlist *evlist)
|
|
{
|
|
struct perf_evsel *evsel;
|
|
u64 branch_type = 0;
|
|
|
|
evlist__for_each_entry(evlist, evsel)
|
|
branch_type |= evsel->attr.branch_sample_type;
|
|
return branch_type;
|
|
}
|
|
|
|
bool perf_evlist__valid_read_format(struct perf_evlist *evlist)
|
|
{
|
|
struct perf_evsel *first = perf_evlist__first(evlist), *pos = first;
|
|
u64 read_format = first->attr.read_format;
|
|
u64 sample_type = first->attr.sample_type;
|
|
|
|
evlist__for_each_entry(evlist, pos) {
|
|
if (read_format != pos->attr.read_format)
|
|
return false;
|
|
}
|
|
|
|
/* PERF_SAMPLE_READ imples PERF_FORMAT_ID. */
|
|
if ((sample_type & PERF_SAMPLE_READ) &&
|
|
!(read_format & PERF_FORMAT_ID)) {
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
u64 perf_evlist__read_format(struct perf_evlist *evlist)
|
|
{
|
|
struct perf_evsel *first = perf_evlist__first(evlist);
|
|
return first->attr.read_format;
|
|
}
|
|
|
|
u16 perf_evlist__id_hdr_size(struct perf_evlist *evlist)
|
|
{
|
|
struct perf_evsel *first = perf_evlist__first(evlist);
|
|
struct perf_sample *data;
|
|
u64 sample_type;
|
|
u16 size = 0;
|
|
|
|
if (!first->attr.sample_id_all)
|
|
goto out;
|
|
|
|
sample_type = first->attr.sample_type;
|
|
|
|
if (sample_type & PERF_SAMPLE_TID)
|
|
size += sizeof(data->tid) * 2;
|
|
|
|
if (sample_type & PERF_SAMPLE_TIME)
|
|
size += sizeof(data->time);
|
|
|
|
if (sample_type & PERF_SAMPLE_ID)
|
|
size += sizeof(data->id);
|
|
|
|
if (sample_type & PERF_SAMPLE_STREAM_ID)
|
|
size += sizeof(data->stream_id);
|
|
|
|
if (sample_type & PERF_SAMPLE_CPU)
|
|
size += sizeof(data->cpu) * 2;
|
|
|
|
if (sample_type & PERF_SAMPLE_IDENTIFIER)
|
|
size += sizeof(data->id);
|
|
out:
|
|
return size;
|
|
}
|
|
|
|
bool perf_evlist__valid_sample_id_all(struct perf_evlist *evlist)
|
|
{
|
|
struct perf_evsel *first = perf_evlist__first(evlist), *pos = first;
|
|
|
|
evlist__for_each_entry_continue(evlist, pos) {
|
|
if (first->attr.sample_id_all != pos->attr.sample_id_all)
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
bool perf_evlist__sample_id_all(struct perf_evlist *evlist)
|
|
{
|
|
struct perf_evsel *first = perf_evlist__first(evlist);
|
|
return first->attr.sample_id_all;
|
|
}
|
|
|
|
void perf_evlist__set_selected(struct perf_evlist *evlist,
|
|
struct perf_evsel *evsel)
|
|
{
|
|
evlist->selected = evsel;
|
|
}
|
|
|
|
void perf_evlist__close(struct perf_evlist *evlist)
|
|
{
|
|
struct perf_evsel *evsel;
|
|
int ncpus = cpu_map__nr(evlist->cpus);
|
|
int nthreads = thread_map__nr(evlist->threads);
|
|
|
|
evlist__for_each_entry_reverse(evlist, evsel) {
|
|
int n = evsel->cpus ? evsel->cpus->nr : ncpus;
|
|
perf_evsel__close(evsel, n, nthreads);
|
|
}
|
|
}
|
|
|
|
static int perf_evlist__create_syswide_maps(struct perf_evlist *evlist)
|
|
{
|
|
struct cpu_map *cpus;
|
|
struct thread_map *threads;
|
|
int err = -ENOMEM;
|
|
|
|
/*
|
|
* Try reading /sys/devices/system/cpu/online to get
|
|
* an all cpus map.
|
|
*
|
|
* FIXME: -ENOMEM is the best we can do here, the cpu_map
|
|
* code needs an overhaul to properly forward the
|
|
* error, and we may not want to do that fallback to a
|
|
* default cpu identity map :-\
|
|
*/
|
|
cpus = cpu_map__new(NULL);
|
|
if (!cpus)
|
|
goto out;
|
|
|
|
threads = thread_map__new_dummy();
|
|
if (!threads)
|
|
goto out_put;
|
|
|
|
perf_evlist__set_maps(evlist, cpus, threads);
|
|
out:
|
|
return err;
|
|
out_put:
|
|
cpu_map__put(cpus);
|
|
goto out;
|
|
}
|
|
|
|
int perf_evlist__open(struct perf_evlist *evlist)
|
|
{
|
|
struct perf_evsel *evsel;
|
|
int err;
|
|
|
|
/*
|
|
* Default: one fd per CPU, all threads, aka systemwide
|
|
* as sys_perf_event_open(cpu = -1, thread = -1) is EINVAL
|
|
*/
|
|
if (evlist->threads == NULL && evlist->cpus == NULL) {
|
|
err = perf_evlist__create_syswide_maps(evlist);
|
|
if (err < 0)
|
|
goto out_err;
|
|
}
|
|
|
|
perf_evlist__update_id_pos(evlist);
|
|
|
|
evlist__for_each_entry(evlist, evsel) {
|
|
err = perf_evsel__open(evsel, evsel->cpus, evsel->threads);
|
|
if (err < 0)
|
|
goto out_err;
|
|
}
|
|
|
|
return 0;
|
|
out_err:
|
|
perf_evlist__close(evlist);
|
|
errno = -err;
|
|
return err;
|
|
}
|
|
|
|
int perf_evlist__prepare_workload(struct perf_evlist *evlist, struct target *target,
|
|
const char *argv[], bool pipe_output,
|
|
void (*exec_error)(int signo, siginfo_t *info, void *ucontext))
|
|
{
|
|
int child_ready_pipe[2], go_pipe[2];
|
|
char bf;
|
|
|
|
if (pipe(child_ready_pipe) < 0) {
|
|
perror("failed to create 'ready' pipe");
|
|
return -1;
|
|
}
|
|
|
|
if (pipe(go_pipe) < 0) {
|
|
perror("failed to create 'go' pipe");
|
|
goto out_close_ready_pipe;
|
|
}
|
|
|
|
evlist->workload.pid = fork();
|
|
if (evlist->workload.pid < 0) {
|
|
perror("failed to fork");
|
|
goto out_close_pipes;
|
|
}
|
|
|
|
if (!evlist->workload.pid) {
|
|
int ret;
|
|
|
|
if (pipe_output)
|
|
dup2(2, 1);
|
|
|
|
signal(SIGTERM, SIG_DFL);
|
|
|
|
close(child_ready_pipe[0]);
|
|
close(go_pipe[1]);
|
|
fcntl(go_pipe[0], F_SETFD, FD_CLOEXEC);
|
|
|
|
/*
|
|
* Tell the parent we're ready to go
|
|
*/
|
|
close(child_ready_pipe[1]);
|
|
|
|
/*
|
|
* Wait until the parent tells us to go.
|
|
*/
|
|
ret = read(go_pipe[0], &bf, 1);
|
|
/*
|
|
* The parent will ask for the execvp() to be performed by
|
|
* writing exactly one byte, in workload.cork_fd, usually via
|
|
* perf_evlist__start_workload().
|
|
*
|
|
* For cancelling the workload without actually running it,
|
|
* the parent will just close workload.cork_fd, without writing
|
|
* anything, i.e. read will return zero and we just exit()
|
|
* here.
|
|
*/
|
|
if (ret != 1) {
|
|
if (ret == -1)
|
|
perror("unable to read pipe");
|
|
exit(ret);
|
|
}
|
|
|
|
execvp(argv[0], (char **)argv);
|
|
|
|
if (exec_error) {
|
|
union sigval val;
|
|
|
|
val.sival_int = errno;
|
|
if (sigqueue(getppid(), SIGUSR1, val))
|
|
perror(argv[0]);
|
|
} else
|
|
perror(argv[0]);
|
|
exit(-1);
|
|
}
|
|
|
|
if (exec_error) {
|
|
struct sigaction act = {
|
|
.sa_flags = SA_SIGINFO,
|
|
.sa_sigaction = exec_error,
|
|
};
|
|
sigaction(SIGUSR1, &act, NULL);
|
|
}
|
|
|
|
if (target__none(target)) {
|
|
if (evlist->threads == NULL) {
|
|
fprintf(stderr, "FATAL: evlist->threads need to be set at this point (%s:%d).\n",
|
|
__func__, __LINE__);
|
|
goto out_close_pipes;
|
|
}
|
|
thread_map__set_pid(evlist->threads, 0, evlist->workload.pid);
|
|
}
|
|
|
|
close(child_ready_pipe[1]);
|
|
close(go_pipe[0]);
|
|
/*
|
|
* wait for child to settle
|
|
*/
|
|
if (read(child_ready_pipe[0], &bf, 1) == -1) {
|
|
perror("unable to read pipe");
|
|
goto out_close_pipes;
|
|
}
|
|
|
|
fcntl(go_pipe[1], F_SETFD, FD_CLOEXEC);
|
|
evlist->workload.cork_fd = go_pipe[1];
|
|
close(child_ready_pipe[0]);
|
|
return 0;
|
|
|
|
out_close_pipes:
|
|
close(go_pipe[0]);
|
|
close(go_pipe[1]);
|
|
out_close_ready_pipe:
|
|
close(child_ready_pipe[0]);
|
|
close(child_ready_pipe[1]);
|
|
return -1;
|
|
}
|
|
|
|
int perf_evlist__start_workload(struct perf_evlist *evlist)
|
|
{
|
|
if (evlist->workload.cork_fd > 0) {
|
|
char bf = 0;
|
|
int ret;
|
|
/*
|
|
* Remove the cork, let it rip!
|
|
*/
|
|
ret = write(evlist->workload.cork_fd, &bf, 1);
|
|
if (ret < 0)
|
|
perror("unable to write to pipe");
|
|
|
|
close(evlist->workload.cork_fd);
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int perf_evlist__parse_sample(struct perf_evlist *evlist, union perf_event *event,
|
|
struct perf_sample *sample)
|
|
{
|
|
struct perf_evsel *evsel = perf_evlist__event2evsel(evlist, event);
|
|
|
|
if (!evsel)
|
|
return -EFAULT;
|
|
return perf_evsel__parse_sample(evsel, event, sample);
|
|
}
|
|
|
|
size_t perf_evlist__fprintf(struct perf_evlist *evlist, FILE *fp)
|
|
{
|
|
struct perf_evsel *evsel;
|
|
size_t printed = 0;
|
|
|
|
evlist__for_each_entry(evlist, evsel) {
|
|
printed += fprintf(fp, "%s%s", evsel->idx ? ", " : "",
|
|
perf_evsel__name(evsel));
|
|
}
|
|
|
|
return printed + fprintf(fp, "\n");
|
|
}
|
|
|
|
int perf_evlist__strerror_open(struct perf_evlist *evlist,
|
|
int err, char *buf, size_t size)
|
|
{
|
|
int printed, value;
|
|
char sbuf[STRERR_BUFSIZE], *emsg = str_error_r(err, sbuf, sizeof(sbuf));
|
|
|
|
switch (err) {
|
|
case EACCES:
|
|
case EPERM:
|
|
printed = scnprintf(buf, size,
|
|
"Error:\t%s.\n"
|
|
"Hint:\tCheck /proc/sys/kernel/perf_event_paranoid setting.", emsg);
|
|
|
|
value = perf_event_paranoid();
|
|
|
|
printed += scnprintf(buf + printed, size - printed, "\nHint:\t");
|
|
|
|
if (value >= 2) {
|
|
printed += scnprintf(buf + printed, size - printed,
|
|
"For your workloads it needs to be <= 1\nHint:\t");
|
|
}
|
|
printed += scnprintf(buf + printed, size - printed,
|
|
"For system wide tracing it needs to be set to -1.\n");
|
|
|
|
printed += scnprintf(buf + printed, size - printed,
|
|
"Hint:\tTry: 'sudo sh -c \"echo -1 > /proc/sys/kernel/perf_event_paranoid\"'\n"
|
|
"Hint:\tThe current value is %d.", value);
|
|
break;
|
|
case EINVAL: {
|
|
struct perf_evsel *first = perf_evlist__first(evlist);
|
|
int max_freq;
|
|
|
|
if (sysctl__read_int("kernel/perf_event_max_sample_rate", &max_freq) < 0)
|
|
goto out_default;
|
|
|
|
if (first->attr.sample_freq < (u64)max_freq)
|
|
goto out_default;
|
|
|
|
printed = scnprintf(buf, size,
|
|
"Error:\t%s.\n"
|
|
"Hint:\tCheck /proc/sys/kernel/perf_event_max_sample_rate.\n"
|
|
"Hint:\tThe current value is %d and %" PRIu64 " is being requested.",
|
|
emsg, max_freq, first->attr.sample_freq);
|
|
break;
|
|
}
|
|
default:
|
|
out_default:
|
|
scnprintf(buf, size, "%s", emsg);
|
|
break;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int perf_evlist__strerror_mmap(struct perf_evlist *evlist, int err, char *buf, size_t size)
|
|
{
|
|
char sbuf[STRERR_BUFSIZE], *emsg = str_error_r(err, sbuf, sizeof(sbuf));
|
|
int pages_attempted = evlist->mmap_len / 1024, pages_max_per_user, printed = 0;
|
|
|
|
switch (err) {
|
|
case EPERM:
|
|
sysctl__read_int("kernel/perf_event_mlock_kb", &pages_max_per_user);
|
|
printed += scnprintf(buf + printed, size - printed,
|
|
"Error:\t%s.\n"
|
|
"Hint:\tCheck /proc/sys/kernel/perf_event_mlock_kb (%d kB) setting.\n"
|
|
"Hint:\tTried using %zd kB.\n",
|
|
emsg, pages_max_per_user, pages_attempted);
|
|
|
|
if (pages_attempted >= pages_max_per_user) {
|
|
printed += scnprintf(buf + printed, size - printed,
|
|
"Hint:\tTry 'sudo sh -c \"echo %d > /proc/sys/kernel/perf_event_mlock_kb\"', or\n",
|
|
pages_max_per_user + pages_attempted);
|
|
}
|
|
|
|
printed += scnprintf(buf + printed, size - printed,
|
|
"Hint:\tTry using a smaller -m/--mmap-pages value.");
|
|
break;
|
|
default:
|
|
scnprintf(buf, size, "%s", emsg);
|
|
break;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
void perf_evlist__to_front(struct perf_evlist *evlist,
|
|
struct perf_evsel *move_evsel)
|
|
{
|
|
struct perf_evsel *evsel, *n;
|
|
LIST_HEAD(move);
|
|
|
|
if (move_evsel == perf_evlist__first(evlist))
|
|
return;
|
|
|
|
evlist__for_each_entry_safe(evlist, n, evsel) {
|
|
if (evsel->leader == move_evsel->leader)
|
|
list_move_tail(&evsel->node, &move);
|
|
}
|
|
|
|
list_splice(&move, &evlist->entries);
|
|
}
|
|
|
|
void perf_evlist__set_tracking_event(struct perf_evlist *evlist,
|
|
struct perf_evsel *tracking_evsel)
|
|
{
|
|
struct perf_evsel *evsel;
|
|
|
|
if (tracking_evsel->tracking)
|
|
return;
|
|
|
|
evlist__for_each_entry(evlist, evsel) {
|
|
if (evsel != tracking_evsel)
|
|
evsel->tracking = false;
|
|
}
|
|
|
|
tracking_evsel->tracking = true;
|
|
}
|
|
|
|
struct perf_evsel *
|
|
perf_evlist__find_evsel_by_str(struct perf_evlist *evlist,
|
|
const char *str)
|
|
{
|
|
struct perf_evsel *evsel;
|
|
|
|
evlist__for_each_entry(evlist, evsel) {
|
|
if (!evsel->name)
|
|
continue;
|
|
if (strcmp(str, evsel->name) == 0)
|
|
return evsel;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
void perf_evlist__toggle_bkw_mmap(struct perf_evlist *evlist,
|
|
enum bkw_mmap_state state)
|
|
{
|
|
enum bkw_mmap_state old_state = evlist->bkw_mmap_state;
|
|
enum action {
|
|
NONE,
|
|
PAUSE,
|
|
RESUME,
|
|
} action = NONE;
|
|
|
|
if (!evlist->backward_mmap)
|
|
return;
|
|
|
|
switch (old_state) {
|
|
case BKW_MMAP_NOTREADY: {
|
|
if (state != BKW_MMAP_RUNNING)
|
|
goto state_err;;
|
|
break;
|
|
}
|
|
case BKW_MMAP_RUNNING: {
|
|
if (state != BKW_MMAP_DATA_PENDING)
|
|
goto state_err;
|
|
action = PAUSE;
|
|
break;
|
|
}
|
|
case BKW_MMAP_DATA_PENDING: {
|
|
if (state != BKW_MMAP_EMPTY)
|
|
goto state_err;
|
|
break;
|
|
}
|
|
case BKW_MMAP_EMPTY: {
|
|
if (state != BKW_MMAP_RUNNING)
|
|
goto state_err;
|
|
action = RESUME;
|
|
break;
|
|
}
|
|
default:
|
|
WARN_ONCE(1, "Shouldn't get there\n");
|
|
}
|
|
|
|
evlist->bkw_mmap_state = state;
|
|
|
|
switch (action) {
|
|
case PAUSE:
|
|
perf_evlist__pause(evlist);
|
|
break;
|
|
case RESUME:
|
|
perf_evlist__resume(evlist);
|
|
break;
|
|
case NONE:
|
|
default:
|
|
break;
|
|
}
|
|
|
|
state_err:
|
|
return;
|
|
}
|