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perf tools: Per-event time support

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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>
This commit is contained in:
Kan Liang
2015-08-04 04:30:19 -04:00
zatwierdzone przez Arnaldo Carvalho de Melo
rodzic 34221118cb
commit 3206771239
7 zmienionych plików z 31 dodań i 5 usunięć
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14
tools/perf/util/evsel.c
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@@ -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)