linux-kernel - Re: [PATCH] sched/fair: change where we report sched stats

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Message-ID: <1418192604.5312.28.camel@marge.simpson.net>
Date:	Wed, 10 Dec 2014 07:23:24 +0100
From:	Mike Galbraith <umgwanakikbuti@...il.com>
To:	Josef Bacik <jbacik@...com>
Cc:	bmaurer@...com, rkroll@...com, kernel-team@...com,
	mingo@...hat.com, peterz@...radead.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] sched/fair: change where we report sched stats

On Tue, 2014-12-09 at 13:21 -0500, Josef Bacik wrote:

> This patch moves stat stuff to after the schedule, right as we are waking up,

But sleep/block ends when the task is awakened/enqueued, not when it
gets the CPU.  You're adding scheduling latency, breaking accounting.

-Mike


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