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

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Message-ID: <1339523164.31548.103.camel@twins>
Date:	Tue, 12 Jun 2012 19:46:04 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Andrew Wagin <avagin@...il.com>
Cc:	Arun Sharma <asharma@...com>, Oleg Strikov <OSTRIKOV@...dia.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org
Subject: Re: [RFC] [PATCH 0/5] Teach perf tool to profile sleep times (V4)

On Tue, 2012-06-12 at 17:15 +0400, Andrew Wagin wrote:
> Yes, I like it. Are you going to commit this? 

No its unfinished and untested.. not even sure its seen a compiler.

Also, in another email I wrote:

> Also, you don't need the callchain on the wakeup side of things. You
> only want the callchain of the sched_switch site.
> 
> We could even dis-allow the callchain unwind when event->ctx->task &&
> event->ctx->task != current -- pretend the unwind failed by writing 0
> entries.
> 
> That also avoids the 'difficultly' of exposing and trying to interpret
> another task's callchain.

That probably wants to be done as well.

If you have the time, please look into this. Hoping of course Frederic
and others don't object to this.. :-)
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