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Subject[PATCH v2 2/3] perf-stat: measure t0 and ref_time after enable_counters()
Date
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>
---
tools/perf/builtin-stat.c | 10 +++++++---
1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index 92696373da994..d030c3a49a8e4 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -931,15 +931,15 @@ static int __run_perf_stat(int argc, const char **argv, int run_idx)
/*
* 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, &times);
if (child_pid != -1) {
@@ -960,6 +960,10 @@ static int __run_perf_stat(int argc, const char **argv, int run_idx)
err = enable_counters();
if (err)
return -1;
+
+ t0 = rdclock();
+ clock_gettime(CLOCK_MONOTONIC, &ref_time);
+
status = dispatch_events(forks, timeout, interval, &times);
}

--
2.30.2
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