diff options
Diffstat (limited to 'tools/perf/util/record.c')
-rw-r--r-- | tools/perf/util/record.c | 108 |
1 files changed, 108 insertions, 0 deletions
diff --git a/tools/perf/util/record.c b/tools/perf/util/record.c new file mode 100644 index 0000000..18d73aa --- /dev/null +++ b/tools/perf/util/record.c @@ -0,0 +1,108 @@ +#include "evlist.h" +#include "evsel.h" +#include "cpumap.h" +#include "parse-events.h" + +typedef void (*setup_probe_fn_t)(struct perf_evsel *evsel); + +static int perf_do_probe_api(setup_probe_fn_t fn, int cpu, const char *str) +{ + struct perf_evlist *evlist; + struct perf_evsel *evsel; + int err = -EAGAIN, fd; + + evlist = perf_evlist__new(); + if (!evlist) + return -ENOMEM; + + if (parse_events(evlist, str)) + goto out_delete; + + evsel = perf_evlist__first(evlist); + + fd = sys_perf_event_open(&evsel->attr, -1, cpu, -1, 0); + if (fd < 0) + goto out_delete; + close(fd); + + fn(evsel); + + fd = sys_perf_event_open(&evsel->attr, -1, cpu, -1, 0); + if (fd < 0) { + if (errno == EINVAL) + err = -EINVAL; + goto out_delete; + } + close(fd); + err = 0; + +out_delete: + perf_evlist__delete(evlist); + return err; +} + +static bool perf_probe_api(setup_probe_fn_t fn) +{ + const char *try[] = {"cycles:u", "instructions:u", "cpu-clock", NULL}; + struct cpu_map *cpus; + int cpu, ret, i = 0; + + cpus = cpu_map__new(NULL); + if (!cpus) + return false; + cpu = cpus->map[0]; + cpu_map__delete(cpus); + + do { + ret = perf_do_probe_api(fn, cpu, try[i++]); + if (!ret) + return true; + } while (ret == -EAGAIN && try[i]); + + return false; +} + +static void perf_probe_sample_identifier(struct perf_evsel *evsel) +{ + evsel->attr.sample_type |= PERF_SAMPLE_IDENTIFIER; +} + +bool perf_can_sample_identifier(void) +{ + return perf_probe_api(perf_probe_sample_identifier); +} + +void perf_evlist__config(struct perf_evlist *evlist, + struct perf_record_opts *opts) +{ + struct perf_evsel *evsel; + bool use_sample_identifier = false; + + /* + * Set the evsel leader links before we configure attributes, + * since some might depend on this info. + */ + if (opts->group) + perf_evlist__set_leader(evlist); + + if (evlist->cpus->map[0] < 0) + opts->no_inherit = true; + + list_for_each_entry(evsel, &evlist->entries, node) + perf_evsel__config(evsel, opts); + + if (evlist->nr_entries > 1) { + struct perf_evsel *first = perf_evlist__first(evlist); + + list_for_each_entry(evsel, &evlist->entries, node) { + if (evsel->attr.sample_type == first->attr.sample_type) + continue; + use_sample_identifier = perf_can_sample_identifier(); + break; + } + list_for_each_entry(evsel, &evlist->entries, node) + perf_evsel__set_sample_id(evsel, use_sample_identifier); + } + + perf_evlist__set_id_pos(evlist); +} |