linux-kernel - Re: [RFC] Extend mwait idle to optimize away IPIs when possible

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Message-ID: <1329227537.2293.1.camel@twins>
Date:	Tue, 14 Feb 2012 14:52:17 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Yong Zhang <yong.zhang0@...il.com>
Cc:	Venki Pallipadi <venki@...gle.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	Aaron Durbin <adurbin@...gle.com>,
	Paul Turner <pjt@...gle.com>, linux-kernel@...r.kernel.org
Subject: Re: [RFC] Extend mwait idle to optimize away IPIs when possible

On Mon, 2012-02-13 at 13:34 +0800, Yong Zhang wrote:
> Yeah, most of the things could be shared. Such as the added logic when
> return from idle and the hooks into ttwu_queue_remote() and
> generic_exec_single().
> 

The thing is, those last two should not have hooks. Nor am I convinced
anything outside of the arch idle loop should have any.


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