* Ingo Molnar <mingo@xxxxxxx> 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 -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
