linux-kernel - Re: [PATCH -v3 3/6] x86, NMI, Rewrite NMI handler

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Date:	Mon, 11 Oct 2010 16:35:18 -0400
From:	Don Zickus <dzickus@...hat.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Huang Ying <ying.huang@...el.com>, Ingo Molnar <mingo@...e.hu>,
	"H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org,
	Andi Kleen <andi@...stfloor.org>,
	Robert Richter <robert.richter@....com>
Subject: Re: [PATCH -v3 3/6] x86, NMI, Rewrite NMI handler

On Mon, Oct 11, 2010 at 06:13:55PM +0200, Peter Zijlstra wrote:
> On Sat, 2010-10-09 at 14:49 +0800, Huang Ying wrote:
> > notify_die(DIE_NMI_IPI);
> > notify_die(DIE_NMI);
> > /* process io port 0x61 */
> > nmi_watchdog_touch();
> > unknown_nmi(); 
> 
> Why keep NMI_IPI? What the heck is it for?
> 
> I'd like to see:
> 
>  DIE_NMI
>  DIE_NMI_UNKNOWN
> 
> In DIE_NMI we walk the chain and deal with NMIs, in DIE_NMI_UNKNOWN we
> try to consume extra NMIs where possible (like the much discussed extra
> PMU interrupts).

Yeah, there was another much discussed thread about creating an NMI
notifier chain (instead of using the die_chain).  And then re-arrange
handlers according to a priority scheme.

I wouldn't mind have Ingo commit most of this patchset to a temporary
work-in-progress branch and have us build more changes on top.  A lot of
these changes are a good stepping stone towards simplifying things.

Cheers,
Don
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