diff options
| author | Song Liu <songliubraving@fb.com> | 2021-03-17 00:18:36 +0300 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2021-03-24 00:05:36 +0300 |
| commit | 435b46ef1d9fd904089199da16a21ade0701537f (patch) | |
| tree | 1dc2968c22887d717adbce9265f87fb6e8d103de /tools/perf/builtin-stat.c | |
| parent | 7fac83aaf2eecc9e7e7b72da694c49bb4ce7fdfc (diff) | |
| download | linux-435b46ef1d9fd904089199da16a21ade0701537f.tar.xz | |
perf stat: Measure 't0' and 'ref_time' after enable_counters()
Take measurements of 't0' and 'ref_time' after enable_counters(), so
that they only measure the time consumed when the counters are enabled.
Signed-off-by: Song Liu <songliubraving@fb.com>
Acked-by: Andi Kleen <andi@firstfloor.org>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: kernel-team@fb.com
Link: http://lore.kernel.org/lkml/20210316211837.910506-3-songliubraving@fb.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/builtin-stat.c')
| -rw-r--r-- | tools/perf/builtin-stat.c | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c index d34e22dce2c8..4bb48c6b6698 100644 --- a/tools/perf/builtin-stat.c +++ b/tools/perf/builtin-stat.c @@ -931,15 +931,15 @@ try_again_reset: /* * Enable counters and exec the command: */ - t0 = rdclock(); - clock_gettime(CLOCK_MONOTONIC, &ref_time); - if (forks) { evlist__start_workload(evsel_list); err = enable_counters(); if (err) return -1; + t0 = rdclock(); + clock_gettime(CLOCK_MONOTONIC, &ref_time); + if (interval || timeout || evlist__ctlfd_initialized(evsel_list)) status = dispatch_events(forks, timeout, interval, ×); if (child_pid != -1) { @@ -960,6 +960,10 @@ try_again_reset: err = enable_counters(); if (err) return -1; + + t0 = rdclock(); + clock_gettime(CLOCK_MONOTONIC, &ref_time); + status = dispatch_events(forks, timeout, interval, ×); } |