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

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Message-ID: <4F308243.8030003@zytor.com>
Date:	Mon, 06 Feb 2012 17:45:39 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	David Daney <ddaney.cavm@...il.com>
CC:	Venkatesh Pallipadi <venki@...gle.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	Aaron Durbin <adurbin@...gle.com>,
	Paul Turner <pjt@...gle.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [RFC] Extend mwait idle to optimize away IPIs when possible

On 02/06/2012 05:34 PM, David Daney wrote:
>
> Well I don't know that part. The gist of my comment was to get rid of an
> unneeded new config variable.
>
> If this works just as well for 32-bit, then by all means do it there too.
>
> In any event, I think you want the kernel to automatically do it if the
> CPU is capable, and not have a manual config setting you have to fiddle
> with.
>

If this is a transitional thing then it might justify it.

	-hpa

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