linux-kernel - Re: [PATCH] trace: add ability to set a target task for events (v2)

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Message-ID: <1342017499.3462.160.camel@twins>
Date:	Wed, 11 Jul 2012 16:38:19 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Andrew Vagin <avagin@...nvz.org>, linux-kernel@...r.kernel.org,
	Ingo Molnar <mingo@...nel.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Paul Mackerras <paulus@...ba.org>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Arun Sharma <asharma@...com>
Subject: Re: [PATCH] trace: add ability to set a target task for events (v2)

On Wed, 2012-07-11 at 16:36 +0200, Frederic Weisbecker wrote:
> 
> In this case he can just record sched wakeup as well. With sched_switch
> + sched_wakeup, he'll unlikely lose events.
> 
> With sched_stat_sleep he will lose events, unless we fix this period
> demux thing. 

But without this patch, the sched_wakeup will belong to another task, so
if you trace task A, and B wakes you, you'll never see the wakeup.
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