linux-kernel - Re: RFC: A proposal for power capping through forced idle in the Linux Kernel

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Message-ID: <1261511304.4937.116.camel@laptop>
Date:	Tue, 22 Dec 2009 20:48:24 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Arjan van de Ven <arjan@...radead.org>
Cc:	Salman Qazi <sqazi@...gle.com>, linux-kernel@...r.kernel.org,
	linux-pm@...ts.linux-foundation.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Michael Rubin <mrubin@...gle.com>,
	Taliver Heath <taliver@...gle.com>
Subject: Re: RFC: A proposal for power capping through forced idle in the
 Linux  Kernel

On Mon, 2009-12-14 at 16:19 -0800, Arjan van de Ven wrote:

> I like the general idea, I have one request (that I didn't see quite in
> your explanation): Please make sure that all cpus in the system do
> their idle injection at the same time, so that memory can go into power
> saving mode as well during this time etc etc...

And then you're going to ask that it scales too, right? :-)

Gang-scheduling is inherently non scalable, be it for idle time or not.

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