linux-kernel - Re: [RFC PATCH] sched: find the latest idle cpu

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Message-ID: <20140115073533.GU31570@twins.programming.kicks-ass.net>
Date:	Wed, 15 Jan 2014 08:35:33 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Alex Shi <alex.shi@...aro.org>
Cc:	mingo@...hat.com, tglx@...utronix.de, daniel.lezcano@...aro.org,
	vincent.guittot@...aro.org, morten.rasmussen@....com,
	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	fengguang.wu@...el.com, linaro-kernel@...ts.linaro.org
Subject: Re: [RFC PATCH] sched: find the latest idle cpu

On Wed, Jan 15, 2014 at 12:07:59PM +0800, Alex Shi wrote:
> Currently we just try to find least load cpu. If some cpus idled,
> we just pick the first cpu in cpu mask.
> 
> In fact we can get the interrupted idle cpu or the latest idled cpu,
> then we may get the benefit from both latency and power.
> The selected cpu maybe not the best, since other cpu may be interrupted
> during our selecting. But be captious costs too much.

No, we should not do anything like this without first integrating
cpuidle.

At which point we have a sane view of the idle states and can make a
sane choice between them.
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