linux-kernel - Re: [RFC 0/9] mce recovery for Sandy Bridge server

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Message-ID: <1306273062.2497.80.camel@laptop>
Date:	Tue, 24 May 2011 23:37:42 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Tony Luck <tony.luck@...el.com>, Borislav Petkov <bp@...64.org>,
	Ingo Molnar <mingo@...e.hu>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Huang, Ying" <ying.huang@...el.com>,
	Andi Kleen <andi@...stfloor.org>,
	Borislav Petkov <bp@...en8.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Mauro Carvalho Chehab <mchehab@...hat.com>
Subject: Re: [RFC 0/9] mce recovery for Sandy Bridge server

On Tue, 2011-05-24 at 14:30 -0700, Linus Torvalds wrote:
> On Tue, May 24, 2011 at 2:24 PM, Peter Zijlstra <a.p.zijlstra@...llo.nl> wrote:
> >
> > Right, so you can't do things like that from NMI context, but what perf
> > can do is raise a self-IPI and continue from IRQ context (question for
> > the HW folks, can there be cycles between the NMI iret and IRQ assert
> > from whatever context was before the NMI hit?)
> 
> Of course there can be - the code where the NMI hit may have
> interrupts disabled.

D'0h yes of course!..

Then I can't immediately see a way to stop a thread dead in its tracks.
Userspace yes, but not kernel-space.

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