From: Peter Zijlstra <peterz-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
To: Glauber Costa <glommer-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org>
Cc: linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
cgroups-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
devel-GEFAQzZX7r8dnm+yROfE0A@public.gmane.org,
Paul Turner <pjt-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>,
Tejun Heo <tj-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
"Eric W. Biederman"
<ebiederm-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org>,
handai.szj-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org,
Andrew.Phillips-xheW4WVAX9Y@public.gmane.org,
Serge Hallyn
<serge.hallyn-Z7WLFzj8eWMS+FvcfC7Uqw@public.gmane.org>
Subject: Re: [PATCH v3 4/6] add a new scheduler hook for context switch
Date: Wed, 30 May 2012 13:40:51 +0200 [thread overview]
Message-ID: <1338378051.26856.267.camel@twins> (raw)
In-Reply-To: <1338376851.26856.260.camel@twins>
On Wed, 2012-05-30 at 13:20 +0200, Peter Zijlstra wrote:
>
> $ perf stat -e cycles --repeat 100 perf bench sched messaging -p -g 100
>
> 48,826,146,710 cycles # 2.470 GHz ( +- 0.17% )
> 2.149005270 seconds time elapsed ( +- 0.12% )
A repeat count of 250 dropped it down to:
2.144582157 seconds time elapsed ( +- 0.08% )
Also, if you're poking at the context switch path, something like:
$ taskset 1 perf stat -e cycles --repeat 10 perf bench sched pipe -l 100000
gives a good number and is usually more stable than hackbench.
next prev parent reply other threads:[~2012-05-30 11:40 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-05-30 9:48 [PATCH v3 0/6] per cgroup /proc/stat statistics Glauber Costa
2012-05-30 9:48 ` [PATCH v3 2/6] account guest time per-cgroup as well Glauber Costa
[not found] ` <1338371317-5980-3-git-send-email-glommer-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org>
2012-05-30 10:32 ` Peter Zijlstra
2012-05-30 10:36 ` Glauber Costa
2012-05-30 10:46 ` Paul Turner
[not found] ` <1338371317-5980-1-git-send-email-glommer-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org>
2012-05-30 9:48 ` [PATCH v3 1/6] measure exec_clock for rt sched entities Glauber Costa
[not found] ` <1338371317-5980-2-git-send-email-glommer-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org>
2012-05-30 10:29 ` Peter Zijlstra
2012-05-30 10:32 ` Glauber Costa
[not found] ` <4FC5F727.2040804-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org>
2012-05-30 10:42 ` Peter Zijlstra
2012-05-30 10:42 ` Glauber Costa
[not found] ` <4FC5F99B.2060109-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org>
2012-05-30 11:00 ` Paul Turner
[not found] ` <CAPM31RL-X2GYju-opjUumPq_cfGiRzGowXEOx9Tq4kVEG-z3SA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2012-05-30 12:09 ` Glauber Costa
2012-05-30 9:48 ` [PATCH v3 3/6] expose fine-grained per-cpu data for cpuacct stats Glauber Costa
[not found] ` <1338371317-5980-4-git-send-email-glommer-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org>
2012-05-30 10:34 ` Peter Zijlstra
2012-05-30 10:34 ` Glauber Costa
[not found] ` <4FC5F7A0.2000201-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org>
2012-05-30 10:43 ` Peter Zijlstra
2012-05-30 10:44 ` Glauber Costa
[not found] ` <4FC5FA20.50301-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org>
2012-05-30 11:24 ` Peter Zijlstra
2012-05-30 11:24 ` Paul Turner
[not found] ` <CAPM31RJanAvDB+pZ+h5J3W6KXvAwPgbbeXgw6C_56tx_Mc+cgA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2012-05-30 12:20 ` Glauber Costa
[not found] ` <4FC6107F.9020802-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org>
2012-05-30 12:48 ` Paul Turner
2012-05-30 12:52 ` Glauber Costa
[not found] ` <CAPM31RJ7s+pNciOEnsfXRU9xCwnUano1k8CTEUuCjsSN5n0-1Q-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2012-05-30 13:26 ` Glauber Costa
2012-05-30 13:26 ` Glauber Costa
2012-05-30 9:48 ` [PATCH v3 6/6] expose per-taskgroup schedstats in cgroup Glauber Costa
[not found] ` <1338371317-5980-7-git-send-email-glommer-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org>
2012-05-30 11:22 ` Peter Zijlstra
2012-05-30 9:48 ` [PATCH v3 4/6] add a new scheduler hook for context switch Glauber Costa
[not found] ` <1338371317-5980-5-git-send-email-glommer-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org>
2012-05-30 11:20 ` Peter Zijlstra
2012-05-30 11:40 ` Peter Zijlstra [this message]
2012-05-30 12:08 ` Glauber Costa
2012-05-30 12:07 ` Glauber Costa
2012-05-30 9:48 ` [PATCH v3 5/6] Also record sleep start for a task group Glauber Costa
[not found] ` <1338371317-5980-6-git-send-email-glommer-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org>
2012-05-30 11:35 ` Paul Turner
[not found] ` <CAPM31R+VXsffUOSOtMPG=g+G9OdzWMKQvx9usTFa3KBbrqPe6A-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2012-05-30 12:24 ` Glauber Costa
[not found] ` <4FC61188.8000908-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org>
2012-05-30 12:44 ` Peter Zijlstra
2012-05-30 12:44 ` Glauber Costa
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