From: Cyrill Gorcunov <gorcunov@openvz.org>
To: Ingo Molnar <mingo@elte.hu>
Cc: Don Zickus <dzickus@redhat.com>,
"Huang, Ying" <ying.huang@intel.com>,
"Maciej W. Rozycki" <macro@linux-mips.org>,
lkml <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH -tip 2/2 resend] x86, traps: Drop nmi_reason_lock until it is really needed
Date: Wed, 02 Mar 2011 19:13:42 +0300 [thread overview]
Message-ID: <4D6E6CB6.7000700@openvz.org> (raw)
In-Reply-To: <20110302160315.GA12620@elte.hu>
On 03/02/2011 07:03 PM, Ingo Molnar wrote:
...
>
> Well, the lock serializes the read-out of the 'NMI reason' port, the handling of
> whatever known reason and then the reassertion of the NMI (on 32-bit).
>
> EDAC has a callback in pci_serr_error() - and this lock serializes that. So we
> cannot just remove a lock like that, if there's any chance of parallel execution on
> multiple CPUs.
>
> Thanks,
>
> Ingo
OK, probably we need some UV person CC'ed (not sure whom) just to explain the
reason for such nmi-listening model. Meanwhile -- lets drop my patch.
--
Cyrill
next prev parent reply other threads:[~2011-03-02 16:13 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-03-02 15:32 [PATCH -tip 2/2 resend] x86, traps: Drop nmi_reason_lock until it is really needed Cyrill Gorcunov
2011-03-02 15:46 ` Ingo Molnar
2011-03-02 15:55 ` Cyrill Gorcunov
2011-03-02 16:03 ` Ingo Molnar
2011-03-02 16:13 ` Cyrill Gorcunov [this message]
2011-03-02 18:40 ` Don Zickus
2011-03-02 19:14 ` Cyrill Gorcunov
2011-03-02 19:46 ` Don Zickus
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