diff options
| author | Kan Liang <kan.liang@intel.com> | 2015-08-04 04:30:19 -0400 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2015-08-05 12:50:52 -0300 |
| commit | 320677123905fd1dd122895cd5fb870ee9e1380b (patch) | |
| tree | 82b523328ec900684341656326ec6bf0a1e5e382 /tools/perf/util/evsel.c | |
| parent | 34221118cb13f8b37480bce7286a1b44e90773d8 (diff) | |
| download | talos-op-linux-320677123905fd1dd122895cd5fb870ee9e1380b.tar.gz talos-op-linux-320677123905fd1dd122895cd5fb870ee9e1380b.zip | |
perf tools: Per-event time support
This patchkit adds the ability to turn off time stamps per event.
One usaful case for partial time is to work with per-event callgraph to
enable "PEBS threshold > 1" (https://lkml.org/lkml/2015/5/10/196), which
can significantly reduce the sampling overhead.
The event samples with time stamps off will not be ordered.
Signed-off-by: Kan Liang <kan.liang@intel.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: http://lkml.kernel.org/r/1438677022-34296-2-git-send-email-kan.liang@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/util/evsel.c')
| -rw-r--r-- | tools/perf/util/evsel.c | 14 |
1 files changed, 11 insertions, 3 deletions
diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c index 7d3acba5a512..7febfe255703 100644 --- a/tools/perf/util/evsel.c +++ b/tools/perf/util/evsel.c @@ -587,15 +587,23 @@ perf_evsel__config_callgraph(struct perf_evsel *evsel, } } -static void apply_config_terms(struct perf_event_attr *attr __maybe_unused, - struct list_head *config_terms) +static void apply_config_terms(struct perf_evsel *evsel) { struct perf_evsel_config_term *term; + struct list_head *config_terms = &evsel->config_terms; + struct perf_event_attr *attr = &evsel->attr; list_for_each_entry(term, config_terms, list) { switch (term->type) { case PERF_EVSEL__CONFIG_TERM_PERIOD: attr->sample_period = term->val.period; + break; + case PERF_EVSEL__CONFIG_TERM_TIME: + if (term->val.time) + perf_evsel__set_sample_bit(evsel, TIME); + else + perf_evsel__reset_sample_bit(evsel, TIME); + break; default: break; } @@ -798,7 +806,7 @@ void perf_evsel__config(struct perf_evsel *evsel, struct record_opts *opts) * Apply event specific term settings, * it overloads any global configuration. */ - apply_config_terms(attr, &evsel->config_terms); + apply_config_terms(evsel); } static int perf_evsel__alloc_fd(struct perf_evsel *evsel, int ncpus, int nthreads) |
