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![Arnaldo Carvalho de Melo](/assets/img/avatar_default.png)
For the common evsel list traversal, so that it becomes more compact. Use the opportunity to start ditching the 'perf_' from 'perf_evlist__', as discussed, as the whole conversion touches a lot of places, lets do it piecemeal when we have the chance due to other work, like in this case. Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: David Ahern <dsahern@gmail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Link: http://lkml.kernel.org/n/tip-qnkx7dzm2h6m6uptkfk03ni6@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
1242 lines
28 KiB
C
1242 lines
28 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/debugfs.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 <unistd.h>
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#include "parse-events.h"
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#include "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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#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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evlist->workload.pid = -1;
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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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/**
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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(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_safe(evlist, n, pos) {
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list_del_init(&pos->node);
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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->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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perf_evlist__munmap(evlist);
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perf_evlist__close(evlist);
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cpu_map__delete(evlist->cpus);
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thread_map__delete(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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void perf_evlist__add(struct perf_evlist *evlist, struct perf_evsel *entry)
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{
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list_add_tail(&entry->node, &evlist->entries);
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entry->idx = evlist->nr_entries;
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if (!evlist->nr_entries++)
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perf_evlist__set_id_pos(evlist);
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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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int nr_entries)
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{
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bool set_id_pos = !evlist->nr_entries;
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list_splice_tail(list, &evlist->entries);
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evlist->nr_entries += nr_entries;
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if (set_id_pos)
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perf_evlist__set_id_pos(evlist);
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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(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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int perf_evlist__add_default(struct perf_evlist *evlist)
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{
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struct perf_event_attr attr = {
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.type = PERF_TYPE_HARDWARE,
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.config = PERF_COUNT_HW_CPU_CYCLES,
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};
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struct perf_evsel *evsel;
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event_attr_init(&attr);
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evsel = perf_evsel__new(&attr);
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if (evsel == NULL)
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goto error;
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/* use strdup() because free(evsel) assumes name is allocated */
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evsel->name = strdup("cycles");
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if (!evsel->name)
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goto error_free;
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perf_evlist__add(evlist, evsel);
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return 0;
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error_free:
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perf_evsel__delete(evsel);
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error:
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return -ENOMEM;
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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, nr_attrs);
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return 0;
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out_delete_partial_list:
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__evlist__for_each_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(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(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 (evsel == NULL)
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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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void perf_evlist__disable(struct perf_evlist *evlist)
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{
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int cpu, thread;
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struct perf_evsel *pos;
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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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for (cpu = 0; cpu < nr_cpus; cpu++) {
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evlist__for_each(evlist, pos) {
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if (!perf_evsel__is_group_leader(pos) || !pos->fd)
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continue;
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for (thread = 0; thread < nr_threads; thread++)
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ioctl(FD(pos, cpu, thread),
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PERF_EVENT_IOC_DISABLE, 0);
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}
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}
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}
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void perf_evlist__enable(struct perf_evlist *evlist)
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{
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int cpu, thread;
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struct perf_evsel *pos;
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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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for (cpu = 0; cpu < nr_cpus; cpu++) {
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evlist__for_each(evlist, pos) {
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if (!perf_evsel__is_group_leader(pos) || !pos->fd)
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continue;
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for (thread = 0; thread < nr_threads; thread++)
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ioctl(FD(pos, cpu, thread),
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PERF_EVENT_IOC_ENABLE, 0);
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}
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}
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}
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int perf_evlist__disable_event(struct perf_evlist *evlist,
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struct perf_evsel *evsel)
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{
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int cpu, thread, err;
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if (!evsel->fd)
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return 0;
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for (cpu = 0; cpu < evlist->cpus->nr; cpu++) {
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for (thread = 0; thread < evlist->threads->nr; thread++) {
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err = ioctl(FD(evsel, cpu, thread),
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PERF_EVENT_IOC_DISABLE, 0);
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if (err)
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return err;
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}
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}
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return 0;
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}
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int perf_evlist__enable_event(struct perf_evlist *evlist,
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struct perf_evsel *evsel)
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{
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int cpu, thread, err;
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if (!evsel->fd)
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return -EINVAL;
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for (cpu = 0; cpu < evlist->cpus->nr; cpu++) {
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for (thread = 0; thread < evlist->threads->nr; thread++) {
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err = ioctl(FD(evsel, cpu, thread),
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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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}
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return 0;
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}
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static 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 = nr_cpus * nr_threads * evlist->nr_entries;
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evlist->pollfd = malloc(sizeof(struct pollfd) * nfds);
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return evlist->pollfd != NULL ? 0 : -ENOMEM;
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}
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void perf_evlist__add_pollfd(struct perf_evlist *evlist, int fd)
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{
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fcntl(fd, F_SETFL, O_NONBLOCK);
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evlist->pollfd[evlist->nr_fds].fd = fd;
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evlist->pollfd[evlist->nr_fds].events = POLLIN;
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evlist->nr_fds++;
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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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static 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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if (errno != ENOTTY)
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return -1;
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/* Legacy way to get event id.. All hail to old kernels! */
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/*
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* This way does not work with group format read, so bail
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* out in that case.
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*/
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if (perf_evlist__read_format(evlist) & PERF_FORMAT_GROUP)
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return -1;
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if (!(evsel->attr.read_format & PERF_FORMAT_ID) ||
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read(fd, &read_data, sizeof(read_data)) == -1)
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return -1;
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if (evsel->attr.read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
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++id_idx;
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if (evsel->attr.read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
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++id_idx;
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id = read_data[id_idx];
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add:
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perf_evlist__id_add(evlist, evsel, cpu, thread, id);
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return 0;
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}
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struct perf_sample_id *perf_evlist__id2sid(struct perf_evlist *evlist, u64 id)
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{
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struct hlist_head *head;
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struct perf_sample_id *sid;
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int hash;
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hash = hash_64(id, PERF_EVLIST__HLIST_BITS);
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head = &evlist->heads[hash];
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hlist_for_each_entry(sid, head, node)
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if (sid->id == id)
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return sid;
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return NULL;
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}
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struct perf_evsel *perf_evlist__id2evsel(struct perf_evlist *evlist, u64 id)
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{
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struct perf_sample_id *sid;
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if (evlist->nr_entries == 1)
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return perf_evlist__first(evlist);
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sid = perf_evlist__id2sid(evlist, id);
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if (sid)
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return sid->evsel;
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if (!perf_evlist__sample_id_all(evlist))
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return perf_evlist__first(evlist);
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return NULL;
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}
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static int perf_evlist__event2id(struct perf_evlist *evlist,
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union perf_event *event, u64 *id)
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{
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const u64 *array = event->sample.array;
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ssize_t n;
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n = (event->header.size - sizeof(event->header)) >> 3;
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if (event->header.type == PERF_RECORD_SAMPLE) {
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if (evlist->id_pos >= n)
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return -1;
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*id = array[evlist->id_pos];
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} else {
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if (evlist->is_pos > n)
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return -1;
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n -= evlist->is_pos;
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*id = array[n];
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}
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return 0;
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}
|
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|
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static struct perf_evsel *perf_evlist__event2evsel(struct perf_evlist *evlist,
|
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union perf_event *event)
|
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{
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struct perf_evsel *first = perf_evlist__first(evlist);
|
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struct hlist_head *head;
|
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struct perf_sample_id *sid;
|
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int hash;
|
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u64 id;
|
|
|
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if (evlist->nr_entries == 1)
|
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return first;
|
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|
|
if (!first->attr.sample_id_all &&
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event->header.type != PERF_RECORD_SAMPLE)
|
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return first;
|
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|
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if (perf_evlist__event2id(evlist, event, &id))
|
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return NULL;
|
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|
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/* Synthesized events have an id of zero */
|
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if (!id)
|
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return first;
|
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|
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hash = hash_64(id, PERF_EVLIST__HLIST_BITS);
|
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head = &evlist->heads[hash];
|
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|
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hlist_for_each_entry(sid, head, node) {
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if (sid->id == id)
|
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return sid->evsel;
|
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}
|
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return NULL;
|
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}
|
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|
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union perf_event *perf_evlist__mmap_read(struct perf_evlist *evlist, int idx)
|
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{
|
|
struct perf_mmap *md = &evlist->mmap[idx];
|
|
unsigned int head = perf_mmap__read_head(md);
|
|
unsigned int old = md->prev;
|
|
unsigned char *data = md->base + page_size;
|
|
union perf_event *event = NULL;
|
|
|
|
if (evlist->overwrite) {
|
|
/*
|
|
* 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 head, we got messed up.
|
|
*
|
|
* In either case, truncate and restart at head.
|
|
*/
|
|
int diff = head - old;
|
|
if (diff > md->mask / 2 || diff < 0) {
|
|
fprintf(stderr, "WARNING: failed to keep up with mmap data.\n");
|
|
|
|
/*
|
|
* head points to a known good entry, start there.
|
|
*/
|
|
old = head;
|
|
}
|
|
}
|
|
|
|
if (old != head) {
|
|
size_t size;
|
|
|
|
event = (union perf_event *)&data[old & md->mask];
|
|
size = event->header.size;
|
|
|
|
/*
|
|
* Event straddles the mmap boundary -- header should always
|
|
* be inside due to u64 alignment of output.
|
|
*/
|
|
if ((old & md->mask) + size != ((old + size) & md->mask)) {
|
|
unsigned int offset = old;
|
|
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;
|
|
}
|
|
|
|
old += size;
|
|
}
|
|
|
|
md->prev = old;
|
|
|
|
return event;
|
|
}
|
|
|
|
void perf_evlist__mmap_consume(struct perf_evlist *evlist, int idx)
|
|
{
|
|
if (!evlist->overwrite) {
|
|
struct perf_mmap *md = &evlist->mmap[idx];
|
|
unsigned int old = md->prev;
|
|
|
|
perf_mmap__write_tail(md, old);
|
|
}
|
|
}
|
|
|
|
static void __perf_evlist__munmap(struct perf_evlist *evlist, int idx)
|
|
{
|
|
if (evlist->mmap[idx].base != NULL) {
|
|
munmap(evlist->mmap[idx].base, evlist->mmap_len);
|
|
evlist->mmap[idx].base = NULL;
|
|
}
|
|
}
|
|
|
|
void perf_evlist__munmap(struct perf_evlist *evlist)
|
|
{
|
|
int i;
|
|
|
|
if (evlist->mmap == NULL)
|
|
return;
|
|
|
|
for (i = 0; i < evlist->nr_mmaps; i++)
|
|
__perf_evlist__munmap(evlist, i);
|
|
|
|
zfree(&evlist->mmap);
|
|
}
|
|
|
|
static int perf_evlist__alloc_mmap(struct perf_evlist *evlist)
|
|
{
|
|
evlist->nr_mmaps = cpu_map__nr(evlist->cpus);
|
|
if (cpu_map__empty(evlist->cpus))
|
|
evlist->nr_mmaps = thread_map__nr(evlist->threads);
|
|
evlist->mmap = zalloc(evlist->nr_mmaps * sizeof(struct perf_mmap));
|
|
return evlist->mmap != NULL ? 0 : -ENOMEM;
|
|
}
|
|
|
|
static int __perf_evlist__mmap(struct perf_evlist *evlist,
|
|
int idx, int prot, int mask, int fd)
|
|
{
|
|
evlist->mmap[idx].prev = 0;
|
|
evlist->mmap[idx].mask = mask;
|
|
evlist->mmap[idx].base = mmap(NULL, evlist->mmap_len, prot,
|
|
MAP_SHARED, fd, 0);
|
|
if (evlist->mmap[idx].base == MAP_FAILED) {
|
|
pr_debug2("failed to mmap perf event ring buffer, error %d\n",
|
|
errno);
|
|
evlist->mmap[idx].base = NULL;
|
|
return -1;
|
|
}
|
|
|
|
perf_evlist__add_pollfd(evlist, fd);
|
|
return 0;
|
|
}
|
|
|
|
static int perf_evlist__mmap_per_evsel(struct perf_evlist *evlist, int idx,
|
|
int prot, int mask, int cpu, int thread,
|
|
int *output)
|
|
{
|
|
struct perf_evsel *evsel;
|
|
|
|
evlist__for_each(evlist, evsel) {
|
|
int fd = FD(evsel, cpu, thread);
|
|
|
|
if (*output == -1) {
|
|
*output = fd;
|
|
if (__perf_evlist__mmap(evlist, idx, prot, mask,
|
|
*output) < 0)
|
|
return -1;
|
|
} else {
|
|
if (ioctl(fd, PERF_EVENT_IOC_SET_OUTPUT, *output) != 0)
|
|
return -1;
|
|
}
|
|
|
|
if ((evsel->attr.read_format & PERF_FORMAT_ID) &&
|
|
perf_evlist__id_add_fd(evlist, evsel, cpu, thread, fd) < 0)
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int perf_evlist__mmap_per_cpu(struct perf_evlist *evlist, int prot,
|
|
int mask)
|
|
{
|
|
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;
|
|
|
|
for (thread = 0; thread < nr_threads; thread++) {
|
|
if (perf_evlist__mmap_per_evsel(evlist, cpu, prot, mask,
|
|
cpu, thread, &output))
|
|
goto out_unmap;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
|
|
out_unmap:
|
|
for (cpu = 0; cpu < nr_cpus; cpu++)
|
|
__perf_evlist__munmap(evlist, cpu);
|
|
return -1;
|
|
}
|
|
|
|
static int perf_evlist__mmap_per_thread(struct perf_evlist *evlist, int prot,
|
|
int mask)
|
|
{
|
|
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;
|
|
|
|
if (perf_evlist__mmap_per_evsel(evlist, thread, prot, mask, 0,
|
|
thread, &output))
|
|
goto out_unmap;
|
|
}
|
|
|
|
return 0;
|
|
|
|
out_unmap:
|
|
for (thread = 0; thread < nr_threads; thread++)
|
|
__perf_evlist__munmap(evlist, thread);
|
|
return -1;
|
|
}
|
|
|
|
static size_t perf_evlist__mmap_size(unsigned long pages)
|
|
{
|
|
/* 512 kiB: default amount of unprivileged mlocked memory */
|
|
if (pages == UINT_MAX)
|
|
pages = (512 * 1024) / page_size;
|
|
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)) {
|
|
/* round pages up to next power of 2 */
|
|
pages = next_pow2_l(pages);
|
|
if (!pages)
|
|
return -EINVAL;
|
|
pr_info("rounding mmap pages size to %lu bytes (%lu pages)\n",
|
|
pages * page_size, pages);
|
|
}
|
|
|
|
if (pages > max)
|
|
return -EINVAL;
|
|
|
|
return pages;
|
|
}
|
|
|
|
int perf_evlist__parse_mmap_pages(const struct option *opt, const char *str,
|
|
int unset __maybe_unused)
|
|
{
|
|
unsigned int *mmap_pages = opt->value;
|
|
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;
|
|
}
|
|
|
|
/**
|
|
* perf_evlist__mmap - Create mmaps to receive events.
|
|
* @evlist: list of events
|
|
* @pages: map length in pages
|
|
* @overwrite: overwrite older events?
|
|
*
|
|
* If @overwrite is %false the user needs to signal event consumption using
|
|
* perf_mmap__write_tail(). Using perf_evlist__mmap_read() does this
|
|
* automatically.
|
|
*
|
|
* Return: %0 on success, negative error code otherwise.
|
|
*/
|
|
int perf_evlist__mmap(struct perf_evlist *evlist, unsigned int pages,
|
|
bool overwrite)
|
|
{
|
|
struct perf_evsel *evsel;
|
|
const struct cpu_map *cpus = evlist->cpus;
|
|
const struct thread_map *threads = evlist->threads;
|
|
int prot = PROT_READ | (overwrite ? 0 : PROT_WRITE), mask;
|
|
|
|
if (evlist->mmap == NULL && perf_evlist__alloc_mmap(evlist) < 0)
|
|
return -ENOMEM;
|
|
|
|
if (evlist->pollfd == 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);
|
|
mask = evlist->mmap_len - page_size - 1;
|
|
|
|
evlist__for_each(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, prot, mask);
|
|
|
|
return perf_evlist__mmap_per_cpu(evlist, prot, mask);
|
|
}
|
|
|
|
int perf_evlist__create_maps(struct perf_evlist *evlist, struct target *target)
|
|
{
|
|
evlist->threads = thread_map__new_str(target->pid, target->tid,
|
|
target->uid);
|
|
|
|
if (evlist->threads == NULL)
|
|
return -1;
|
|
|
|
if (target__uses_dummy_map(target))
|
|
evlist->cpus = cpu_map__dummy_new();
|
|
else
|
|
evlist->cpus = cpu_map__new(target->cpu_list);
|
|
|
|
if (evlist->cpus == NULL)
|
|
goto out_delete_threads;
|
|
|
|
return 0;
|
|
|
|
out_delete_threads:
|
|
thread_map__delete(evlist->threads);
|
|
return -1;
|
|
}
|
|
|
|
int perf_evlist__apply_filters(struct perf_evlist *evlist)
|
|
{
|
|
struct perf_evsel *evsel;
|
|
int err = 0;
|
|
const int ncpus = cpu_map__nr(evlist->cpus),
|
|
nthreads = thread_map__nr(evlist->threads);
|
|
|
|
evlist__for_each(evlist, evsel) {
|
|
if (evsel->filter == NULL)
|
|
continue;
|
|
|
|
err = perf_evsel__set_filter(evsel, ncpus, nthreads, evsel->filter);
|
|
if (err)
|
|
break;
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
int perf_evlist__set_filter(struct perf_evlist *evlist, const char *filter)
|
|
{
|
|
struct perf_evsel *evsel;
|
|
int err = 0;
|
|
const int ncpus = cpu_map__nr(evlist->cpus),
|
|
nthreads = thread_map__nr(evlist->threads);
|
|
|
|
evlist__for_each(evlist, evsel) {
|
|
err = perf_evsel__set_filter(evsel, ncpus, nthreads, filter);
|
|
if (err)
|
|
break;
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
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(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(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);
|
|
}
|
|
|
|
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(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_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_reverse(evlist, evsel)
|
|
perf_evsel__close(evsel, ncpus, nthreads);
|
|
}
|
|
|
|
int perf_evlist__open(struct perf_evlist *evlist)
|
|
{
|
|
struct perf_evsel *evsel;
|
|
int err;
|
|
|
|
perf_evlist__update_id_pos(evlist);
|
|
|
|
evlist__for_each(evlist, evsel) {
|
|
err = perf_evsel__open(evsel, evlist->cpus, evlist->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) {
|
|
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.
|
|
*/
|
|
if (read(go_pipe[0], &bf, 1) == -1)
|
|
perror("unable to read pipe");
|
|
|
|
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))
|
|
evlist->threads->map[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("enable 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(evlist, evsel) {
|
|
printed += fprintf(fp, "%s%s", evsel->idx ? ", " : "",
|
|
perf_evsel__name(evsel));
|
|
}
|
|
|
|
return printed + fprintf(fp, "\n");
|
|
}
|
|
|
|
int perf_evlist__strerror_tp(struct perf_evlist *evlist __maybe_unused,
|
|
int err, char *buf, size_t size)
|
|
{
|
|
char sbuf[128];
|
|
|
|
switch (err) {
|
|
case ENOENT:
|
|
scnprintf(buf, size, "%s",
|
|
"Error:\tUnable to find debugfs\n"
|
|
"Hint:\tWas your kernel was compiled with debugfs support?\n"
|
|
"Hint:\tIs the debugfs filesystem mounted?\n"
|
|
"Hint:\tTry 'sudo mount -t debugfs nodev /sys/kernel/debug'");
|
|
break;
|
|
case EACCES:
|
|
scnprintf(buf, size,
|
|
"Error:\tNo permissions to read %s/tracing/events/raw_syscalls\n"
|
|
"Hint:\tTry 'sudo mount -o remount,mode=755 %s'\n",
|
|
debugfs_mountpoint, debugfs_mountpoint);
|
|
break;
|
|
default:
|
|
scnprintf(buf, size, "%s", strerror_r(err, sbuf, sizeof(sbuf)));
|
|
break;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int perf_evlist__strerror_open(struct perf_evlist *evlist __maybe_unused,
|
|
int err, char *buf, size_t size)
|
|
{
|
|
int printed, value;
|
|
char sbuf[128], *emsg = strerror_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");
|
|
|
|
printed += scnprintf(buf + printed, size - printed,
|
|
".\nHint:\tThe current value is %d.", 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_safe(evlist, n, evsel) {
|
|
if (evsel->leader == move_evsel->leader)
|
|
list_move_tail(&evsel->node, &move);
|
|
}
|
|
|
|
list_splice(&move, &evlist->entries);
|
|
}
|