Re: [PATCH] perf,x86: P4 PMU -- update nmi irq statistics andunmask lvt entry properly

From: Cyrill Gorcunov
Date: Sat Aug 07 2010 - 17:48:21 EST

On Thu, Aug 05, 2010 at 07:09:17PM +0400, Cyrill Gorcunov wrote:
> In case if last active performance counter is not overflowed at
> moment of NMI being triggered by another counter, the irq statistics
> may miss an update stage. As a more serious consequence -- apic quirk
> may not be triggered so apic lvt entry stay masked.
> Tested-by: Lin Ming <ming.m.lin@xxxxxxxxx>
> Signed-off-by: Cyrill Gorcunov <gorcunov@xxxxxxxxxx>
> CC: Lin Ming <ming.m.lin@xxxxxxxxx>
> CC: Stephane Eranian <eranian@xxxxxxxxxx>
> CC: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
> CC: Ingo Molnar <mingo@xxxxxxx>
> CC: Frederic Weisbecker <fweisbec@xxxxxxxxx>
> ---

Ping? Frederic, perhaps you'll pick it up?

-- Cyrill
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