linux-kernel - Re: [PATCH v3] perf/sched: fix for getting task's execution time

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Message-ID: <4B1F73E1.6040000@cn.fujitsu.com>
Date:	Wed, 09 Dec 2009 17:54:41 +0800
From:	Xiao Guangrong <xiaoguangrong@...fujitsu.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Xiao Guangrong <ericxiao.gr@...il.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Paul Mackerras <paulus@...ba.org>,
	T??r??k Edwin <edwintorok@...il.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3] perf/sched: fix for getting task's execution time

Sorry, miss Reported-by, please ignore this mail, i'll resend it

Xiao Guangrong wrote:
> In current code, task's execute time is got by reading
> '/proc/<pid>/sched' file, it's wrong if the task is created
> by pthread_create(), because every thread task has same pid.
> 
> This way also has two demerits:
> 
> 1: 'perf sched replay' can't work if the kernel not compile
>     with 'CONFIG_SCHED_DEBUG' option
> 2: perf tool should depend on proc file system
> 
> So, this patch use PERF_COUNT_SW_TASK_CLOCK to get task's
> execution time instead of reading /proc file
> 
> Changelog v2 -> v3:
> use PERF_COUNT_SW_TASK_CLOCK instead of rusage() as Ingo's suggestion
> 
> Signed-off-by: Xiao Guangrong <xiaoguangrong@...fujitsu.com>
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