linux-kernel - Re: [PATCH 3/3] sched, fair: Stop searching for tasks in newidle balance if there are runnable tasks

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Message-ID: <1398328099.6486.29.camel@marge.simpson.net>
Date:	Thu, 24 Apr 2014 10:28:19 +0200
From:	Mike Galbraith <umgwanakikbuti@...il.com>
To:	Jason Low <jason.low2@...com>
Cc:	mingo@...nel.org, peterz@...radead.org,
	linux-kernel@...r.kernel.org, daniel.lezcano@...aro.org,
	alex.shi@...aro.org, preeti@...ux.vnet.ibm.com,
	vincent.guittot@...aro.org, morten.rasmussen@....com, aswin@...com,
	chegu_vinod@...com
Subject: Re: [PATCH 3/3] sched, fair: Stop searching for tasks in newidle
 balance if there are runnable tasks

On Thu, 2014-04-24 at 04:51 +0200, Mike Galbraith wrote:

> Checking rq->lock for contention before ever going to idle balancing as
> well should give you a bit more.  No need to run around looking for work
> that's trying to arrive.  By not going there, perhaps stacking tasks,
> you may head off a future bounce as well.

Zzt.  Bailing without drop/retake to let work land would be a bad plan.

-Mike

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