linux-kernel - Re: [PATCH 0/8] perf sched: Add trace event for sched wait.

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Message-ID: <534E5B3A.4010109@cn.fujitsu.com>
Date:	Wed, 16 Apr 2014 19:28:10 +0900
From:	Dongsheng Yang <yangds.fnst@...fujitsu.com>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	<rostedt@...dmis.org>, <fweisbec@...il.com>, <mingo@...hat.com>,
	<acme@...stprotocols.net>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/8] perf sched: Add trace event for sched wait.

On 04/15/2014 10:54 PM, Peter Zijlstra wrote:
> On Tue, Apr 15, 2014 at 09:32:49PM +0900, Dongsheng Yang wrote:
>> But about 3, we have no trace event for it.
> We do, sched_switch() includes the previous task state. Also there's
> tons more than a waitqueue you can get stuck in.
Okey, prev_state is designed to trace No. 3 situation, but it seems
not working well now from my test result. I will look into it and dig
the reason out. Thanx for your help.
> .
>

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