* Ingo Molnar <[email protected]> wrote:
> Note that you do not want the context switch event, but the CPU
> migration event: that will notify user-space when it gets migrated
> to another CPU. This is the case that RCU really needs.
Also note that the main current use-case of perf events is
instrumentation, thus if you make use of this facility for user-space
RCU you need to check whether the events are all precise and arrive
in time to the target process, etc.
Statistical behavior isnt a big problem for instrumentation but it's
a showstopper for RCU, obviously! :-)
If you find such bugs then we want to fix them, so there's no
fundamental *desire* from us for these events to be statistical and
inaccurate anywhere.
Thanks,
Ingo
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