linux-kernel - Re: [PATCH] sched: Include group statistics in /proc/sched

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Message-Id: <1226309407.2697.4034.camel@twins>
Date:	Mon, 10 Nov 2008 10:30:07 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	bharata@...ux.vnet.ibm.com
Cc:	linux-kernel@...r.kernel.org,
	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>,
	Ingo Molnar <mingo@...e.hu>,
	Dhaval Giani <dhaval@...ux.vnet.ibm.com>
Subject: Re: [PATCH] sched: Include group statistics in /proc/sched_debug

On Mon, 2008-11-10 at 14:53 +0530, Bharata B Rao wrote:
> Include group statistics in /proc/sched_debug.
> 
> Since the statistics of a group entity isn't exported directly from the
> kernel, it becomes difficult to obtain some of the group statistics.
> For example, the current method to obtain exec time of a group entity
> is not always accurate. One has to read the exec times of all
> the tasks(/proc/<pid>/sched) in the group and add them. This method
> fails (or becomes difficult) if we want to collect stats of a group over
> a duration where tasks get created and terminated.
> 
> This patch makes it easier to obtain group stats by directly including
> them in /proc/sched_debug. Stats like group exec time would help user
> programs (like LTP) to accurately measure the group fairness.
> 
> Signed-off-by: Bharata B Rao <bharata@...ux.vnet.ibm.com>
> CC: Peter Zijlstra <a.p.zijlstra@...llo.nl>
> CC: Ingo Molnar <mingo@...e.hu>
> CC: Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>
> ---

<snip patch>

> An extract of /proc/sched_debug showing group stats obtained from
> this patch:
> 
> group[1]:/3/a/1
>   .se->exec_start                : 256484.781577
>   .se->vruntime                  : 12868.176994
>   .se->sum_exec_runtime          : 3243.669709
>   .se->wait_start                : 0.000000
>   .se->sleep_start               : 0.000000
>   .se->block_start               : 0.000000
>   .se->sleep_max                 : 0.000000
>   .se->block_max                 : 0.000000
>   .se->exec_max                  : 1.002095
>   .se->slice_max                 : 13.997073
>   .se->wait_max                  : 67.978322
>   .se->wait_sum                  : 7141.676906
>   .se->wait_count                : 203
>   .se->load.weight               : 255

Why not simply add them to the cfs_rq[n]:/path sections we already have?

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