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From: Peter Zijlstra on 12 Jun 2010 05:50
On Sat, 2010-06-12 at 09:34 +0200, Frederic Weisbecker wrote:
> In order to introduce new context exclusions, software events will
> have to eventually stop when needed. We'll want perf_event_stop() to
> act on every events.
>
> To achieve this, remove the stub stop/start pmu callbacks of software
> and tracepoint events that fixed a race in perf_adjust_period, and do
> an explicit check to only reset the hardware event using the
> start/stop callbacks.

I really object to this,. its just too ugly to live.
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