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Date: Thu, 2 Dec 2010 00:35:14 +0300
From: Cyrill Gorcunov <gorcunov@gmail.com>
To: Andi Kleen <andi@firstfloor.org>
Cc: Don Zickus <dzickus@redhat.com>, Ingo Molnar <mingo@elte.hu>,
        Peter Zijlstra <peterz@infradead.org>,
        Robert Richter <robert.richter@amd.com>, ying.huang@intel.com,
        LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 4/9] x86, NMI: Remove DIE_NMI_IPI and add priorties to
	handlers
Message-ID: <20101201213513.GD6478@lenovo>
References: <1291156050-4482-1-git-send-email-dzickus@redhat.com> <1291156050-4482-5-git-send-email-dzickus@redhat.com> <20101201184128.GB6478@lenovo> <20101201213034.GD7218@basil.fritz.box>
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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