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

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Message-ID: <4B1BE588.8020608@gmail.com>
Date:	Mon, 07 Dec 2009 01:10:32 +0800
From:	Xiao Guangrong <ericxiao.gr@...il.com>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	Xiao Guangrong <xiaoguangrong@...fujitsu.com>,
	Ingo Molnar <mingo@...e.hu>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Paul Mackerras <paulus@...ba.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] perf/sched: fix for getting task's execute time

Peter Zijlstra wrote:

>> We really should not be using these proc files but instead make sure
>> this information gets transferred through a tracepoint or similar.
>>
>> Reading these proc files is too prone to races.
> 
> We can probably get the runtime by grouping a task-clock swcounter with
> an appropriate other event.
> 

Hi Peter,

Thanks your suggestion.

Actually, we can call getrusage(RUSAGE_THREAD, ru) to get current task's
execute time, and I think this is a simpler way.

I'll send v2 patch later.

Thanks,
Xiao
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