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Commit ff5f3bbd authored by Yunlong Song's avatar Yunlong Song Committed by Arnaldo Carvalho de Melo
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perf sched replay: Use replay_repeat to calculate the runavg of cpu usage... 


perf sched replay: Use replay_repeat to calculate the runavg of cpu usage instead of the default value 10

Since sched->replay_repeat is set to 10 as default, the sched->run_avg,
sched->runavg_cpu_usage, and sched->runavg_parent_cpu_usage all use
10 to calculate their value.

However, the replay_repeat can be changed to other value by using -r
option, so the calculation above should use replay_repeat to achieve
more accurate results instead of the default value 10.

Signed-off-by: default avatarYunlong Song <yunlong.song@huawei.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/r/1427809596-29559-10-git-send-email-yunlong.song@huawei.com


Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent f0dd330f

tools/perf/builtin-sched.c

+4 −4
Original line number Diff line number Diff line
@@ -607,13 +607,13 @@ static void wait_for_tasks(struct perf_sched *sched) 
	cpu_usage_1 = get_cpu_usage_nsec_parent();

	if (!sched->runavg_cpu_usage)

		sched->runavg_cpu_usage = sched->cpu_usage;

	sched->runavg_cpu_usage = (sched->runavg_cpu_usage * 9 + sched->cpu_usage) / 10;

	sched->runavg_cpu_usage = (sched->runavg_cpu_usage * (sched->replay_repeat - 1) + sched->cpu_usage) / sched->replay_repeat;



	sched->parent_cpu_usage = cpu_usage_1 - cpu_usage_0;

	if (!sched->runavg_parent_cpu_usage)

		sched->runavg_parent_cpu_usage = sched->parent_cpu_usage;

	sched->runavg_parent_cpu_usage = (sched->runavg_parent_cpu_usage * 9 +

					 sched->parent_cpu_usage)/10;

	sched->runavg_parent_cpu_usage = (sched->runavg_parent_cpu_usage * (sched->replay_repeat - 1) +

					 sched->parent_cpu_usage)/sched->replay_repeat;



	ret = pthread_mutex_lock(&sched->start_work_mutex);

	BUG_ON(ret);
@@ -645,7 +645,7 @@ static void run_one_test(struct perf_sched *sched) 
	sched->sum_fluct += fluct;

	if (!sched->run_avg)

		sched->run_avg = delta;

	sched->run_avg = (sched->run_avg * 9 + delta) / 10;

	sched->run_avg = (sched->run_avg * (sched->replay_repeat - 1) + delta) / sched->replay_repeat;



	printf("#%-3ld: %0.3f, ", sched->nr_runs, (double)delta / 1000000.0);