diff options
| author | Kan Liang <kan.liang@intel.com> | 2015-08-04 11:30:19 +0300 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2015-08-05 18:50:52 +0300 |
| commit | 320677123905fd1dd122895cd5fb870ee9e1380b (patch) | |
| tree | 82b523328ec900684341656326ec6bf0a1e5e382 /tools/perf/util/parse-events.c | |
| parent | 34221118cb13f8b37480bce7286a1b44e90773d8 (diff) | |
| download | linux-320677123905fd1dd122895cd5fb870ee9e1380b.tar.xz | |
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/parse-events.c')
| -rw-r--r-- | tools/perf/util/parse-events.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c index 09bee93fd0ec..a6cb9afc20e2 100644 --- a/tools/perf/util/parse-events.c +++ b/tools/perf/util/parse-events.c @@ -603,6 +603,14 @@ do { \ * attr->branch_sample_type = term->val.num; */ break; + case PARSE_EVENTS__TERM_TYPE_TIME: + CHECK_TYPE_VAL(NUM); + if (term->val.num > 1) { + err->str = strdup("expected 0 or 1"); + err->idx = term->err_val; + return -EINVAL; + } + break; case PARSE_EVENTS__TERM_TYPE_NAME: CHECK_TYPE_VAL(STR); break; @@ -650,6 +658,10 @@ do { \ switch (term->type_term) { case PARSE_EVENTS__TERM_TYPE_SAMPLE_PERIOD: ADD_CONFIG_TERM(PERIOD, period, term->val.num); + break; + case PARSE_EVENTS__TERM_TYPE_TIME: + ADD_CONFIG_TERM(TIME, time, term->val.num); + break; default: break; } |