linux-kernel - Re: [PATCH] Extend mwait idle to optimize away CAL and RES interrupts to an idle CPU -v1

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Message-ID: <1330331881.11248.28.camel@twins>
Date:	Mon, 27 Feb 2012 09:38:01 +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: [PATCH] Extend mwait idle to optimize away CAL and RES
 interrupts to an idle CPU -v1

On Fri, 2012-02-24 at 14:13 +0800, Yong Zhang wrote:

> This remind me that we should have moved the irq_enter()/irq_exit() to
> each arch's related irq handler.
> see: http://marc.info/?l=linux-kernel&m=130709505700821&w=2
> 
> So Peter, is there someone alread on it? or it still worth doing now?

trouble was that some people didn't feel comfortable adding that
overhead to plain resched IPIs that didn't need to do anything. So I
more or less let it sit for a while.
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