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

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Message-ID: <20091210072351.GF16874@elte.hu>
Date:	Thu, 10 Dec 2009 08:23:51 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Xiao Guangrong <xiaoguangrong@...fujitsu.com>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	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


* Xiao Guangrong <xiaoguangrong@...fujitsu.com> wrote:

> 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.

What do you mean by mixing it with ftrace data? These events ought to be 
a full replacement for the sched and wakeup tracers. In the long run we 
want a single stream of events and phase out most of the pretty-printing 
ftrace plugins.

	Ingo
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