linux-kernel - Re: [PATCH 4/9] x86, NMI: Remove DIE_NMI

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Message-ID: <20101201213513.GD6478@lenovo>
Date:	Thu, 2 Dec 2010 00:35:14 +0300
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Don Zickus <dzickus@...hat.com>, Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <peterz@...radead.org>,
	Robert Richter <robert.richter@....com>, ying.huang@...el.com,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 4/9] x86, NMI: Remove DIE_NMI_IPI and add priorties to
	handlers

On Wed, Dec 01, 2010 at 10:30:34PM +0100, Andi Kleen wrote:
> On Wed, Dec 01, 2010 at 09:41:28PM +0300, Cyrill Gorcunov wrote:
> > On Tue, Nov 30, 2010 at 05:27:25PM -0500, Don Zickus wrote:
> > > When re-ordering how the NMI handles its callbacks, a conversation started
> > > asking what DIE_NMI_IPI meant.  No one could answer it.
> > 
...
> > Andi do you remember what the initial idea was? Didn't find any user of it
> > even in this old commit. Just curious.
> 
> The original die names were pretty much a 1:1 conversion of the hooks
> used by both the external KDB and KGDB patchkits floating around
> at that time.
> 
> IIRC DIE_NMI_IPI was the one that was early in the NMI handler
> and DIE_NMI late when everything else failed.
> 
> So you could use NMI_IPI when you just wanted to stop
> all CPUs with a broadcast NMI and can check that reliable
> through some memory location, and NMI when you wanted
> to drop into the debugger as a last resort.
> 
> 
> -Andi
>

Thanks for info Andi, good to know.
 
  Cyrill
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