75562573ba
Enable parsing of samples with sample format bit PERF_SAMPLE_IDENTIFIER. In addition, if the kernel supports it, prefer it to selecting PERF_SAMPLE_ID thereby allowing non-matching sample types. Signed-off-by: Adrian Hunter <adrian.hunter@intel.com> Cc: David Ahern <dsahern@gmail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@kernel.org> 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/r/1377591794-30553-8-git-send-email-adrian.hunter@intel.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
108 lines
2.3 KiB
C
108 lines
2.3 KiB
C
#include "evlist.h"
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#include "evsel.h"
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#include "cpumap.h"
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#include "parse-events.h"
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typedef void (*setup_probe_fn_t)(struct perf_evsel *evsel);
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static int perf_do_probe_api(setup_probe_fn_t fn, int cpu, const char *str)
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{
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struct perf_evlist *evlist;
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struct perf_evsel *evsel;
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int err = -EAGAIN, fd;
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evlist = perf_evlist__new();
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if (!evlist)
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return -ENOMEM;
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if (parse_events(evlist, str))
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goto out_delete;
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evsel = perf_evlist__first(evlist);
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fd = sys_perf_event_open(&evsel->attr, -1, cpu, -1, 0);
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if (fd < 0)
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goto out_delete;
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close(fd);
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fn(evsel);
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fd = sys_perf_event_open(&evsel->attr, -1, cpu, -1, 0);
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if (fd < 0) {
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if (errno == EINVAL)
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err = -EINVAL;
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goto out_delete;
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}
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close(fd);
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err = 0;
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out_delete:
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perf_evlist__delete(evlist);
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return err;
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}
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static bool perf_probe_api(setup_probe_fn_t fn)
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{
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const char *try[] = {"cycles:u", "instructions:u", "cpu-clock", NULL};
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struct cpu_map *cpus;
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int cpu, ret, i = 0;
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cpus = cpu_map__new(NULL);
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if (!cpus)
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return false;
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cpu = cpus->map[0];
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cpu_map__delete(cpus);
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do {
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ret = perf_do_probe_api(fn, cpu, try[i++]);
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if (!ret)
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return true;
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} while (ret == -EAGAIN && try[i]);
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return false;
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}
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static void perf_probe_sample_identifier(struct perf_evsel *evsel)
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{
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evsel->attr.sample_type |= PERF_SAMPLE_IDENTIFIER;
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}
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bool perf_can_sample_identifier(void)
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{
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return perf_probe_api(perf_probe_sample_identifier);
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}
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void perf_evlist__config(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;
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bool use_sample_identifier = false;
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/*
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* Set the evsel leader links before we configure attributes,
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* since some might depend on this info.
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*/
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if (opts->group)
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perf_evlist__set_leader(evlist);
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if (evlist->cpus->map[0] < 0)
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opts->no_inherit = true;
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list_for_each_entry(evsel, &evlist->entries, node)
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perf_evsel__config(evsel, opts);
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if (evlist->nr_entries > 1) {
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struct perf_evsel *first = perf_evlist__first(evlist);
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list_for_each_entry(evsel, &evlist->entries, node) {
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if (evsel->attr.sample_type == first->attr.sample_type)
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continue;
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use_sample_identifier = perf_can_sample_identifier();
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break;
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}
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list_for_each_entry(evsel, &evlist->entries, node)
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perf_evsel__set_sample_id(evsel, use_sample_identifier);
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}
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perf_evlist__set_id_pos(evlist);
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}
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