Re: [PATCH RFC] remove jump_label optimization for perf sched events

[Peter Zijlstra]

On Thu, 2011-11-17 at 15:00 +0200, Gleb Natapov wrote:

> > That said, I'd much rather throttle this particular jump label than
> > remove it altogether, some people really don't like all this scheduler
> > hot path crap.
> What about moving perf_event_task_sched() to sched_(in|out)_preempt_notifiers?
> preempt notifiers checking is already on the scheduler hot path, so no
> additional overhead for perf case.

Same problem really, some people complain about the overhead of preempt
notifiers, also not all kernels have those in. 

Futhermore I loathe notifier lists because they obscure wtf is done.
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