linux-kernel - Re: [tip:perf/core] Revert "sched, perf: Use a single callback into the scheduler"

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Date:	Wed, 23 May 2012 18:33:54 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	mingo@...nel.org, hpa@...or.com, linux-kernel@...r.kernel.org,
	tglx@...utronix.de, jolsa@...hat.com
Cc:	linux-tip-commits@...r.kernel.org
Subject: Re: [tip:perf/core] Revert "sched, perf: Use a single callback
 into the scheduler"

On Wed, 2012-05-23 at 09:09 -0700, tip-bot for Jiri Olsa wrote:
>  > I rather liked we could do away with both that black-spot and
>  > clean up the code a little, but apparently people rely on it.
> 
Ingo noted that inherited counters already are active over the context
switch (due to the lazy switch optimization) and thus profile the
context switch cost.

Regular per-task counters not including this are therefore not
consistent.

So it would be good to find a way to fix the tracing fallout
differently. A well..

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