Re: [PATCH 1/2] perf: Fix the software events state check

[Peter Zijlstra]

On Wed, 2011-03-09 at 14:52 +0100, Frederic Weisbecker wrote:
> 
> It seems that ->stop() / ->start() are called from perf_adjust_period()
> to update the hardware with the new settings of period_left. The events
> are stopped to avoid any race with events triggering with a stale period_left
> in the hardware level when the software one has been updated, I guess.
> 
> So it doesn't seem to fix any existing bug because for ->stop() and ->start()
> are only useful for hardware events right now. But we may call ->stop() and
> ->start() for further purpose later. In fact that paves the way for the event
> exclusion patchset I'm about to post.
> 
> So it should be .39 material. But a confirmation from Peter would be nice. 

Yeah, that sounds about right, I've already queued these patches
for .39.
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