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

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Date:	Sat, 11 Feb 2012 04:09:21 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Venki Pallipadi <venki@...gle.com>
Cc:	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,
	Yong Zhang <yong.zhang0@...il.com>
Subject: Re: [RFC] Extend mwait idle to optimize away IPIs when possible

On Fri, 2012-02-10 at 18:11 -0800, Venki Pallipadi wrote:

> OK. Moving most of this into arch code will be cleaner. But, Yong
> mentioned in this thread that he was looking to do something similar
> on MIPS. So, we may end up with some code duplication though..

If there's significant duplication you can always move a few helpers
into lib/, but I think we shouldn't let this get outside of the PIC and
idle code (both clearly arch specific), all we're doing is optimizing
the IPI delivery, conceptually we're still sending one.


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