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![Arnaldo Carvalho de Melo](/assets/img/avatar_default.png)
To replace the longer list_entry constructs for things that are widely used: perf_evlist__{first,last}(evlist) perf_evsel__next(evsel) Acked-by: Jiri Olsa <jolsa@redhat.com> Acked-by: Namhyung Kim <namhyung@gmail.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@gmail.com> 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-ng7azq26wg1jd801qqpcozwp@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
891 lines
20 KiB
C
891 lines
20 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 "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 <unistd.h>
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#include "parse-events.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(struct cpu_map *cpus,
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struct thread_map *threads)
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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, cpus, threads);
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return evlist;
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}
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void perf_evlist__config_attrs(struct perf_evlist *evlist,
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struct perf_record_opts *opts)
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{
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struct perf_evsel *evsel, *first;
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if (evlist->cpus->map[0] < 0)
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opts->no_inherit = true;
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first = perf_evlist__first(evlist);
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list_for_each_entry(evsel, &evlist->entries, node) {
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perf_evsel__config(evsel, opts, first);
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if (evlist->nr_entries > 1)
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evsel->attr.sample_type |= PERF_SAMPLE_ID;
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}
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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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list_for_each_entry_safe(pos, n, &evlist->entries, node) {
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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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free(evlist->mmap);
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free(evlist->pollfd);
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evlist->mmap = NULL;
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evlist->pollfd = NULL;
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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__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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++evlist->nr_entries;
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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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list_splice_tail(list, &evlist->entries);
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evlist->nr_entries += nr_entries;
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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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leader->leader = NULL;
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list_for_each_entry(evsel, list, node) {
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if (evsel != leader)
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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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__perf_evlist__set_leader(&evlist->entries);
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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, 0);
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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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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(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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list_for_each_entry_safe(evsel, n, &head, node)
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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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static int trace_event__id(const char *evname)
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{
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char *filename, *colon;
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int err = -1, fd;
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if (asprintf(&filename, "%s/%s/id", tracing_events_path, evname) < 0)
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return -1;
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colon = strrchr(filename, ':');
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if (colon != NULL)
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*colon = '/';
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fd = open(filename, O_RDONLY);
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if (fd >= 0) {
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char id[16];
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if (read(fd, id, sizeof(id)) > 0)
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err = atoi(id);
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close(fd);
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}
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free(filename);
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return err;
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}
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int perf_evlist__add_tracepoints(struct perf_evlist *evlist,
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const char *tracepoints[],
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size_t nr_tracepoints)
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{
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int err;
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size_t i;
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struct perf_event_attr *attrs = zalloc(nr_tracepoints * sizeof(*attrs));
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if (attrs == NULL)
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return -1;
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for (i = 0; i < nr_tracepoints; i++) {
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err = trace_event__id(tracepoints[i]);
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if (err < 0)
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goto out_free_attrs;
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attrs[i].type = PERF_TYPE_TRACEPOINT;
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attrs[i].config = err;
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attrs[i].sample_type = (PERF_SAMPLE_RAW | PERF_SAMPLE_TIME |
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PERF_SAMPLE_CPU | PERF_SAMPLE_PERIOD);
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attrs[i].sample_period = 1;
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}
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err = perf_evlist__add_attrs(evlist, attrs, nr_tracepoints);
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out_free_attrs:
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free(attrs);
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return err;
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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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list_for_each_entry(evsel, &evlist->entries, node) {
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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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int perf_evlist__set_tracepoints_handlers(struct perf_evlist *evlist,
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const struct perf_evsel_str_handler *assocs,
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size_t nr_assocs)
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{
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struct perf_evsel *evsel;
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int err;
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size_t i;
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for (i = 0; i < nr_assocs; i++) {
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err = trace_event__id(assocs[i].name);
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if (err < 0)
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goto out;
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evsel = perf_evlist__find_tracepoint_by_id(evlist, err);
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if (evsel == NULL)
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continue;
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err = -EEXIST;
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if (evsel->handler.func != NULL)
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goto out;
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evsel->handler.func = assocs[i].handler;
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}
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err = 0;
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out:
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return err;
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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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for (cpu = 0; cpu < evlist->cpus->nr; cpu++) {
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list_for_each_entry(pos, &evlist->entries, node) {
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for (thread = 0; thread < evlist->threads->nr; 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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for (cpu = 0; cpu < evlist->cpus->nr; cpu++) {
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list_for_each_entry(pos, &evlist->entries, node) {
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for (thread = 0; thread < evlist->threads->nr; 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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static int perf_evlist__alloc_pollfd(struct perf_evlist *evlist)
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{
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int nfds = evlist->cpus->nr * evlist->threads->nr * 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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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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perf_evlist__id_add(evlist, evsel, cpu, thread, read_data[id_idx]);
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return 0;
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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 hlist_head *head;
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struct hlist_node *pos;
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struct perf_sample_id *sid;
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int hash;
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if (evlist->nr_entries == 1)
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return perf_evlist__first(evlist);
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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, pos, head, node)
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if (sid->id == id)
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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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union perf_event *perf_evlist__mmap_read(struct perf_evlist *evlist, int idx)
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{
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/* XXX Move this to perf.c, making it generally available */
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unsigned int page_size = sysconf(_SC_PAGE_SIZE);
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struct perf_mmap *md = &evlist->mmap[idx];
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unsigned int head = perf_mmap__read_head(md);
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unsigned int old = md->prev;
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unsigned char *data = md->base + page_size;
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union perf_event *event = NULL;
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if (evlist->overwrite) {
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/*
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* If we're further behind than half the buffer, there's a chance
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* the writer will bite our tail and mess up the samples under us.
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*
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* If we somehow ended up ahead of the head, we got messed up.
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*
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* In either case, truncate and restart at head.
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*/
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int diff = head - old;
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if (diff > md->mask / 2 || diff < 0) {
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fprintf(stderr, "WARNING: failed to keep up with mmap data.\n");
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/*
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* head points to a known good entry, start there.
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*/
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old = head;
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}
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}
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if (old != head) {
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size_t size;
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event = (union perf_event *)&data[old & md->mask];
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size = event->header.size;
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/*
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* Event straddles the mmap boundary -- header should always
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* be inside due to u64 alignment of output.
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*/
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if ((old & md->mask) + size != ((old + size) & md->mask)) {
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unsigned int offset = old;
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unsigned int len = min(sizeof(*event), size), cpy;
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void *dst = &evlist->event_copy;
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do {
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cpy = min(md->mask + 1 - (offset & md->mask), len);
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memcpy(dst, &data[offset & md->mask], cpy);
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offset += cpy;
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dst += cpy;
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len -= cpy;
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} while (len);
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event = &evlist->event_copy;
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}
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old += size;
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}
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md->prev = old;
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if (!evlist->overwrite)
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perf_mmap__write_tail(md, old);
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return event;
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}
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void perf_evlist__munmap(struct perf_evlist *evlist)
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{
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int i;
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for (i = 0; i < evlist->nr_mmaps; i++) {
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if (evlist->mmap[i].base != NULL) {
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munmap(evlist->mmap[i].base, evlist->mmap_len);
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evlist->mmap[i].base = NULL;
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}
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}
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free(evlist->mmap);
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evlist->mmap = NULL;
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}
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static int perf_evlist__alloc_mmap(struct perf_evlist *evlist)
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{
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evlist->nr_mmaps = evlist->cpus->nr;
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if (evlist->cpus->map[0] == -1)
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evlist->nr_mmaps = evlist->threads->nr;
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evlist->mmap = zalloc(evlist->nr_mmaps * sizeof(struct perf_mmap));
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return evlist->mmap != NULL ? 0 : -ENOMEM;
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}
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static int __perf_evlist__mmap(struct perf_evlist *evlist,
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int idx, int prot, int mask, int fd)
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{
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evlist->mmap[idx].prev = 0;
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evlist->mmap[idx].mask = mask;
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evlist->mmap[idx].base = mmap(NULL, evlist->mmap_len, prot,
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MAP_SHARED, fd, 0);
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if (evlist->mmap[idx].base == MAP_FAILED) {
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evlist->mmap[idx].base = NULL;
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return -1;
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}
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perf_evlist__add_pollfd(evlist, fd);
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return 0;
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}
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static int perf_evlist__mmap_per_cpu(struct perf_evlist *evlist, int prot, int mask)
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{
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struct perf_evsel *evsel;
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int cpu, thread;
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|
|
for (cpu = 0; cpu < evlist->cpus->nr; cpu++) {
|
|
int output = -1;
|
|
|
|
for (thread = 0; thread < evlist->threads->nr; thread++) {
|
|
list_for_each_entry(evsel, &evlist->entries, node) {
|
|
int fd = FD(evsel, cpu, thread);
|
|
|
|
if (output == -1) {
|
|
output = fd;
|
|
if (__perf_evlist__mmap(evlist, cpu,
|
|
prot, mask, output) < 0)
|
|
goto out_unmap;
|
|
} else {
|
|
if (ioctl(fd, PERF_EVENT_IOC_SET_OUTPUT, output) != 0)
|
|
goto out_unmap;
|
|
}
|
|
|
|
if ((evsel->attr.read_format & PERF_FORMAT_ID) &&
|
|
perf_evlist__id_add_fd(evlist, evsel, cpu, thread, fd) < 0)
|
|
goto out_unmap;
|
|
}
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
|
|
out_unmap:
|
|
for (cpu = 0; cpu < evlist->cpus->nr; cpu++) {
|
|
if (evlist->mmap[cpu].base != NULL) {
|
|
munmap(evlist->mmap[cpu].base, evlist->mmap_len);
|
|
evlist->mmap[cpu].base = NULL;
|
|
}
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
static int perf_evlist__mmap_per_thread(struct perf_evlist *evlist, int prot, int mask)
|
|
{
|
|
struct perf_evsel *evsel;
|
|
int thread;
|
|
|
|
for (thread = 0; thread < evlist->threads->nr; thread++) {
|
|
int output = -1;
|
|
|
|
list_for_each_entry(evsel, &evlist->entries, node) {
|
|
int fd = FD(evsel, 0, thread);
|
|
|
|
if (output == -1) {
|
|
output = fd;
|
|
if (__perf_evlist__mmap(evlist, thread,
|
|
prot, mask, output) < 0)
|
|
goto out_unmap;
|
|
} else {
|
|
if (ioctl(fd, PERF_EVENT_IOC_SET_OUTPUT, output) != 0)
|
|
goto out_unmap;
|
|
}
|
|
|
|
if ((evsel->attr.read_format & PERF_FORMAT_ID) &&
|
|
perf_evlist__id_add_fd(evlist, evsel, 0, thread, fd) < 0)
|
|
goto out_unmap;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
|
|
out_unmap:
|
|
for (thread = 0; thread < evlist->threads->nr; thread++) {
|
|
if (evlist->mmap[thread].base != NULL) {
|
|
munmap(evlist->mmap[thread].base, evlist->mmap_len);
|
|
evlist->mmap[thread].base = NULL;
|
|
}
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
/** perf_evlist__mmap - Create per cpu maps 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 consuption using:
|
|
*
|
|
* struct perf_mmap *m = &evlist->mmap[cpu];
|
|
* unsigned int head = perf_mmap__read_head(m);
|
|
*
|
|
* perf_mmap__write_tail(m, head)
|
|
*
|
|
* Using perf_evlist__read_on_cpu does this automatically.
|
|
*/
|
|
int perf_evlist__mmap(struct perf_evlist *evlist, unsigned int pages,
|
|
bool overwrite)
|
|
{
|
|
unsigned int page_size = sysconf(_SC_PAGE_SIZE);
|
|
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;
|
|
|
|
/* 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 -EINVAL;
|
|
|
|
mask = pages * page_size - 1;
|
|
|
|
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 = (pages + 1) * page_size;
|
|
|
|
list_for_each_entry(evsel, &evlist->entries, node) {
|
|
if ((evsel->attr.read_format & PERF_FORMAT_ID) &&
|
|
evsel->sample_id == NULL &&
|
|
perf_evsel__alloc_id(evsel, cpus->nr, threads->nr) < 0)
|
|
return -ENOMEM;
|
|
}
|
|
|
|
if (evlist->cpus->map[0] == -1)
|
|
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 perf_target *target)
|
|
{
|
|
evlist->threads = thread_map__new_str(target->pid, target->tid,
|
|
target->uid);
|
|
|
|
if (evlist->threads == NULL)
|
|
return -1;
|
|
|
|
if (perf_target__has_task(target))
|
|
evlist->cpus = cpu_map__dummy_new();
|
|
else if (!perf_target__has_cpu(target) && !target->uses_mmap)
|
|
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;
|
|
}
|
|
|
|
void perf_evlist__delete_maps(struct perf_evlist *evlist)
|
|
{
|
|
cpu_map__delete(evlist->cpus);
|
|
thread_map__delete(evlist->threads);
|
|
evlist->cpus = NULL;
|
|
evlist->threads = NULL;
|
|
}
|
|
|
|
int perf_evlist__set_filters(struct perf_evlist *evlist)
|
|
{
|
|
const struct thread_map *threads = evlist->threads;
|
|
const struct cpu_map *cpus = evlist->cpus;
|
|
struct perf_evsel *evsel;
|
|
char *filter;
|
|
int thread;
|
|
int cpu;
|
|
int err;
|
|
int fd;
|
|
|
|
list_for_each_entry(evsel, &evlist->entries, node) {
|
|
filter = evsel->filter;
|
|
if (!filter)
|
|
continue;
|
|
for (cpu = 0; cpu < cpus->nr; cpu++) {
|
|
for (thread = 0; thread < threads->nr; thread++) {
|
|
fd = FD(evsel, cpu, thread);
|
|
err = ioctl(fd, PERF_EVENT_IOC_SET_FILTER, filter);
|
|
if (err)
|
|
return err;
|
|
}
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
bool perf_evlist__valid_sample_type(struct perf_evlist *evlist)
|
|
{
|
|
struct perf_evsel *first = perf_evlist__first(evlist), *pos = first;
|
|
|
|
list_for_each_entry_continue(pos, &evlist->entries, node) {
|
|
if (first->attr.sample_type != pos->attr.sample_type)
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
u64 perf_evlist__sample_type(struct perf_evlist *evlist)
|
|
{
|
|
struct perf_evsel *first = perf_evlist__first(evlist);
|
|
return first->attr.sample_type;
|
|
}
|
|
|
|
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;
|
|
out:
|
|
return size;
|
|
}
|
|
|
|
bool perf_evlist__valid_sample_id_all(struct perf_evlist *evlist)
|
|
{
|
|
struct perf_evsel *first = perf_evlist__first(evlist), *pos = first;
|
|
|
|
list_for_each_entry_continue(pos, &evlist->entries, node) {
|
|
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;
|
|
}
|
|
|
|
int perf_evlist__open(struct perf_evlist *evlist)
|
|
{
|
|
struct perf_evsel *evsel;
|
|
int err, ncpus, nthreads;
|
|
|
|
list_for_each_entry(evsel, &evlist->entries, node) {
|
|
err = perf_evsel__open(evsel, evlist->cpus, evlist->threads);
|
|
if (err < 0)
|
|
goto out_err;
|
|
}
|
|
|
|
return 0;
|
|
out_err:
|
|
ncpus = evlist->cpus ? evlist->cpus->nr : 1;
|
|
nthreads = evlist->threads ? evlist->threads->nr : 1;
|
|
|
|
list_for_each_entry_reverse(evsel, &evlist->entries, node)
|
|
perf_evsel__close(evsel, ncpus, nthreads);
|
|
|
|
errno = -err;
|
|
return err;
|
|
}
|
|
|
|
int perf_evlist__prepare_workload(struct perf_evlist *evlist,
|
|
struct perf_record_opts *opts,
|
|
const char *argv[])
|
|
{
|
|
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 (opts->pipe_output)
|
|
dup2(2, 1);
|
|
|
|
close(child_ready_pipe[0]);
|
|
close(go_pipe[1]);
|
|
fcntl(go_pipe[0], F_SETFD, FD_CLOEXEC);
|
|
|
|
/*
|
|
* Do a dummy execvp to get the PLT entry resolved,
|
|
* so we avoid the resolver overhead on the real
|
|
* execvp call.
|
|
*/
|
|
execvp("", (char **)argv);
|
|
|
|
/*
|
|
* 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);
|
|
|
|
perror(argv[0]);
|
|
kill(getppid(), SIGUSR1);
|
|
exit(-1);
|
|
}
|
|
|
|
if (perf_target__none(&opts->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;
|
|
}
|
|
|
|
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) {
|
|
/*
|
|
* Remove the cork, let it rip!
|
|
*/
|
|
return close(evlist->workload.cork_fd);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int perf_evlist__parse_sample(struct perf_evlist *evlist, union perf_event *event,
|
|
struct perf_sample *sample, bool swapped)
|
|
{
|
|
struct perf_evsel *evsel = perf_evlist__first(evlist);
|
|
return perf_evsel__parse_sample(evsel, event, sample, swapped);
|
|
}
|