linux-kernel - Re: [tip:perf/core] x86, NMI: Rewrite NMI handler

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Date:	Mon, 18 Oct 2010 11:06:54 +0800
From:	Huang Ying <ying.huang@...el.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Don Zickus <dzickus@...hat.com>,
	"mingo@...hat.com" <mingo@...hat.com>,
	"hpa@...or.com" <hpa@...or.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"mingo@...e.hu" <mingo@...e.hu>,
	"linux-tip-commits@...r.kernel.org" 
	<linux-tip-commits@...r.kernel.org>
Subject: Re: [tip:perf/core] x86, NMI: Rewrite NMI handler

On Sun, 2010-10-17 at 18:42 +0800, Peter Zijlstra wrote:
> On Sat, 2010-10-16 at 20:46 -0400, Don Zickus wrote:
> 
> > Hmm, well to his defense, he isn't adding DIE_NMI_IPI.  That code is
> > already there.  He is just re-arranging it, making it look painfully
> > obvious the die_chain probably isn't as efficient as it should be.
> > 
> > I think a bunch of us agree that we need to revamp the NMI notifier to
> > make it less wasteful.  I was hoping we could do that in a separate patch
> > that would be layered on top of Huangs.
> > 
> > Would you object to at least consider having this patch series in a
> > work-in-progress git branch that we can build on top of, with the final
> > outcome containing an nmi notifier that meets your expectations?
> 
> What's the point of keeping it in a git tree? Its just a few patches.
> 
> We've spend more time talking about this than it would take to actually
> do the patch that kills DIE_NMI_IPI.

You can kill DIE_NMI_IPI. But you will add at least NMI_PRIORITY_LOCAL
(like DIE_NMI_IPI), NMI_PRIORITY_GLOBAL (like original DIE_NMI). So
thing is similar, just moved from one place to another place.

Best Regards,
Huang Ying


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