linux-kernel - Re: [RFC] [PATCH 0/5] Teach perf tool to profile sleep times (V4)

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Message-ID: <4FCCEA4E.5060102@fb.com>
Date:	Mon, 4 Jun 2012 10:03:10 -0700
From:	Arun Sharma <asharma@...com>
To:	Andrew Vagin <avagin@...nvz.org>
CC:	Oleg Strikov <OSTRIKOV@...dia.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [RFC] [PATCH 0/5] Teach perf tool to profile sleep times (V4)

On 6/4/12 1:09 AM, Andrew Vagin wrote:
>
> * "sched/tracing: Add a new tracepoint for sleeptime" by Arun Sharma
> It has been committed, but then reverted due to performance reason.

Correctness actually. The first sample could potentially be bogus and 
needs to be discarded in userspace. Hasn't been a problem in practice 
for us.

  -Arun
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