linux-kernel - Re: [PATCH -tip] perf, x86: P4 PMU - Don't forget to clear cpuc->active

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Message-ID: <20110421125345.GC31724@redhat.com>
Date:	Thu, 21 Apr 2011 08:53:45 -0400
From:	Don Zickus <dzickus@...hat.com>
To:	Cyrill Gorcunov <gorcunov@...nvz.org>
Cc:	Lin Ming <ming.m.lin@...el.com>, Ingo Molnar <mingo@...e.hu>,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH -tip] perf, x86: P4 PMU - Don't forget to clear
 cpuc->active_mask on overflow

On Wed, Apr 20, 2011 at 07:13:37PM +0400, Cyrill Gorcunov wrote:
> It's not enough to simply disable event on overflow the cpuc->active_mask
> should be cleared as well otherwise counter may stall in "active" even
> in real being already disabled (which potentially may lead to the situation
> that user may not use this counter further).

I also noticed this patch fixed some unknown NMIs on a P4 when I stressed
the box

Acked-by: Don Zickus <dzickus@...hat.com>
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