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From: Peter Zijlstra <peterz@infradead.org>
To: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Andrew Vagin <avagin@openvz.org>,
	linux-kernel@vger.kernel.org, Ingo Molnar <mingo@kernel.org>,
	Steven Rostedt <rostedt@goodmis.org>,
	Paul Mackerras <paulus@samba.org>,
	Arnaldo Carvalho de Melo <acme@ghostprotocols.net>,
	Arun Sharma <asharma@fb.com>
Subject: Re: [PATCH] trace: add ability to set a target task for events (v2)
Date: Wed, 11 Jul 2012 16:38:19 +0200	[thread overview]
Message-ID: <1342017499.3462.160.camel@twins> (raw)
In-Reply-To: <20120711143656.GB17991@somewhere>

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.

  reply	other threads:[~2012-07-11 14:38 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-07-11 14:14 Andrew Vagin
2012-07-11 14:31 ` Frederic Weisbecker
2012-07-11 14:33   ` Peter Zijlstra
2012-07-11 14:36     ` Frederic Weisbecker
2012-07-11 14:38       ` Peter Zijlstra [this message]
2012-07-11 14:48         ` Frederic Weisbecker
2012-07-11 14:55           ` Peter Zijlstra
2012-07-11 15:07             ` Frederic Weisbecker
2012-07-11 15:12             ` Peter Zijlstra
2012-07-11 15:17               ` Frederic Weisbecker
2012-07-11 15:09 ` Peter Zijlstra
2012-07-31 17:58 ` [tip:perf/urgent] perf/trace: Add ability to set a target task for events tip-bot for Andrew Vagin

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