Re: [tip:perf/urgent] perf, x86: Catch spurious interrupts afterdisabling counters

[Robert Richter]

On 29.09.10 11:33:07, Stephane Eranian wrote:
> There is something else bothering me with cpuc->running.
> 
> It is not reset outside of the interrupt handler. So what if
> event scheduling shuffles things around and an event is
> moved somewhere else. Don't you need to clear the
> cpuc->running[idx] for the old counter index?

We can clear it only in the NMI handler, because the next NMI after
stopping a counter must mark the counter as handled. This may cause
some false positives, but it is the best we can get.

-Robert

-- 
Advanced Micro Devices, Inc.
Operating System Research Center

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