Re: [RFC PATCHSET] sched,perf: unify tracers in sched and move perf on top of TP

Avi Kivity
2010-05-06T08:19:45Z

On 05/06/2010 09:28 AM, Ingo Molnar wrote:
>
> Yep. Also, most of the default distro kernels will have 3 sets of facilities:
>
> - preempt notifiers
> - tracepoints
> - sw events
>
> which is crazy. We can just standardize on using the tracepoint interface
> definition methods - they are properly typed, widespread and well-known enough
> to be perfect for this.
>
> ( They are also under intense optimization - the jump-tracepoints patch makes
> them probably even cheaper than preempt notifiers, in the off case. )
>
>

What about the on case? kvm has preempt notifiers enabled all the time,
and relies on their being fast.

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