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

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Date:	Tue, 12 Oct 2010 08:50:50 +0800
From:	Huang Ying <ying.huang@...el.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Don Zickus <dzickus@...hat.com>, Ingo Molnar <mingo@...e.hu>,
	"H. Peter Anvin" <hpa@...or.com>,
	"linux-kernel@...r.kernel.org" <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 Tue, 2010-10-12 at 00:13 +0800, 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?

DIE_NMI_IPI is used for CPU-specific or CPU-local NMIs, such as perf
NMI. While DIE_NMI is used for non-CPU-specific or global NMIs, such as
NMI notification from source bridge.

The order between these two is important. So we use two die value to
enforce the order.

> 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).

Best Regards,
Huang Ying


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