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Date:	Fri, 24 Feb 2012 14:13:50 +0800
From:	Yong Zhang <>
To:	Venki Pallipadi <>,
	Peter Zijlstra <>
Cc:	Thomas Gleixner <>,
	Ingo Molnar <>,
	"H. Peter Anvin" <>,
	Suresh Siddha <>,
	Aaron Durbin <>,
	Paul Turner <>,
Subject: Re: [PATCH] Extend mwait idle to optimize away CAL and RES
 interrupts to an idle CPU -v1

On Fri, Feb 24, 2012 at 01:41:50PM +0800, Yong Zhang wrote:
> On Thu, Feb 23, 2012 at 11:34:11AM -0800, Venki Pallipadi wrote:
> > On Thu, Feb 23, 2012 at 1:30 AM, Peter Zijlstra <> wrote:
> > > Why not scheduler_ipi()?
> > 
> > Was trying to avoid irq_enter/exit. As the work here is done in idle
> > thread context, I though we could avoid enter/exit. 
> It seems we could not.
> At least RCU need it, see commit c5d753a55, otherwise we will get
> warning like 'RCU used illegally from extended quiescent state!'

[Off topic]
This remind me that we should have moved the irq_enter()/irq_exit() to
each arch's related irq handler.

So Peter, is there someone alread on it? or it still worth doing now?

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