From: Don Zickus <dzickus@redhat.com>
To: Cyrill Gorcunov <gorcunov@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>,
Jason Wessel <jason.wessel@windriver.com>,
Lin Ming <ming.m.lin@intel.com>,
Stephane Eranian <eranian@google.com>,
Peter Zijlstra <peterz@infradead.org>,
lkml <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH -tip/master] perf, x86: P4 PMU - Fix unflagged overflows handling v4
Date: Fri, 7 Jan 2011 14:10:52 -0500 [thread overview]
Message-ID: <20110107191052.GB26503@redhat.com> (raw)
In-Reply-To: <4D275E7E.3040903@gmail.com>
On Fri, Jan 07, 2011 at 09:42:06PM +0300, Cyrill Gorcunov wrote:
> Don found that P4 PMU reads CCCR register instead of counter
> itself (in attempt to catch unflagged event) this makes P4
> NMI handler to consume all NMIs it observes. So the other
> NMI users such as kgdb simply have no chance to get NMI
> on their hands.
Acked-by: Don Zickus <dzickus@redhat.com>
next prev parent reply other threads:[~2011-01-07 19:11 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-01-07 18:42 [PATCH -tip/master] perf, x86: P4 PMU - Fix unflagged overflows handling v4 Cyrill Gorcunov
2011-01-07 19:10 ` Don Zickus [this message]
2011-01-09 0:41 ` Lin Ming
2011-01-09 21:13 ` [tip:perf/urgent] perf, x86: P4 PMU - Fix unflagged overflows handling tip-bot for Cyrill Gorcunov
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