From: Peter Zijlstra <peterz@infradead.org>
To: Cyrill Gorcunov <gorcunov@gmail.com>
Cc: Don Zickus <dzickus@redhat.com>, Ingo Molnar <mingo@elte.hu>,
Robert Richter <robert.richter@amd.com>,
ying.huang@intel.com, Andi Kleen <andi@firstfloor.org>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 4/9] x86, NMI: Remove DIE_NMI_IPI and add priorties to handlers
Date: Wed, 01 Dec 2010 19:53:42 +0100 [thread overview]
Message-ID: <1291229622.32004.1886.camel@laptop> (raw)
In-Reply-To: <20101201184128.GB6478@lenovo>
On Wed, 2010-12-01 at 21:41 +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.
>
> It should have came from commit
>
> | commit c4b2bffee2a4115fed2825530f2b906ee2f17bd7
> | Author: Andi Kleen <ak@suse.de>
> | Date: Fri Jan 23 18:46:40 2004 -0800
> |
> | [PATCH] x86-64 merge
> |
> | Mainly lots of bug fixes and a few minor features. One change is that
> | it uses drivers/Kconfig now like i386. This requires a few minor changes in
> | outside Kconfig files which I am sending separately.
> ...
>
> Andi do you remember what the initial idea was? Didn't find any user of it
> even in this old commit. Just curious.
>
> >
> > Noticing that is was wasteful to call the die_chain a second time with just
> > another argument, DIE_NMI_IPI, it was decided to nuke it and add priorities
> > to the die_chain handlers to maintain existing behaviour.
> >
> > This patch replaces DIE_NMI_IPI with the appropriate option, mostly DIE_NMI.
> > Then it adds priorities to those handlers, using a globally defined set of
> > priorities for NMI.
> >
> > The thought is eventually we will just switch the nmi handlers from the
> > die_chain to something more nmi specific.
> >
> > Signed-off-by: Don Zickus <dzickus@redhat.com>
> > ---
>
> Don, maybe switching to say new chains like chain_perf and friends would be
> more readable/clean? I'm not against this patch by any means, but just a thought ;)
Its a single event (NMI) so we only need a single notifier list, the
current one seems to be just fine.
next prev parent reply other threads:[~2010-12-01 18:53 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-11-30 22:27 [V3 PATCH 0/9] x86, NMI: give NMI handler a face-lift Don Zickus
2010-11-30 22:27 ` [PATCH 1/9] x86, NMI: Add NMI symbol constants and rename memory parity to PCI SERR Don Zickus
2010-11-30 22:27 ` [PATCH 2/9] x86, NMI: Add touch_nmi_watchdog to io_check_error delay Don Zickus
2010-11-30 22:27 ` [PATCH 3/9] x86, NMI: Rewrite NMI handler Don Zickus
2010-11-30 22:27 ` [PATCH 4/9] x86, NMI: Remove DIE_NMI_IPI and add priorties to handlers Don Zickus
2010-12-01 18:41 ` Cyrill Gorcunov
2010-12-01 18:53 ` Peter Zijlstra [this message]
2010-12-01 19:01 ` Cyrill Gorcunov
2010-12-01 21:30 ` Andi Kleen
2010-12-01 21:35 ` Cyrill Gorcunov
2010-11-30 22:27 ` [PATCH 5/9] x86, NMI: Allow NMI reason io port (0x61) to be processed on any CPU Don Zickus
2010-11-30 22:27 ` [PATCH 6/9] x86: only call smp_processor_id in non-preempt cases Don Zickus
2010-12-01 18:07 ` Cyrill Gorcunov
2010-11-30 22:27 ` [PATCH 7/9] x86: Avoid calling arch_trigger_all_cpu_backtrace() at the same time Don Zickus
2010-11-30 22:27 ` [PATCH 8/9] panic: ratelimit panic messages Don Zickus
2010-11-30 22:27 ` [PATCH 9/9] watchdog: touch_nmi_watchdog should only touch local cpu not every one Don Zickus
2010-12-22 3:16 ` [V3 PATCH 0/9] x86, NMI: give NMI handler a face-lift Huang Ying
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