linux-kernel - Re: [PATCH] perf sched: Add max delay time snapshot

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Message-ID: <4B206A18.2030607@cn.fujitsu.com>
Date:	Thu, 10 Dec 2009 11:25:12 +0800
From:	Xiao Guangrong <xiaoguangrong@...fujitsu.com>
To:	Frederic Weisbecker <fweisbec@...il.com>
CC:	Ingo Molnar <mingo@...e.hu>, LKML <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Paul Mackerras <paulus@...ba.org>
Subject: Re: [PATCH] perf sched: Add max delay time snapshot



Frederic Weisbecker wrote:
> When we have a maximum latency reported for a task, we need a
> convenient way to find the matching location to the raw traces
> or to perf sched map that shows where the task has been eventually
> scheduled in. This gives a pointer to retrieve the events that occured
> during this max latency.
> 

Then, we can cooperate with ftrace's data to know what the cpu is
doing at that time.

Reviewed-by: Xiao Guangrong <xiaoguangrong@...fujitsu.com>

Thanks,
Xiao
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