* Ingo Molnar <mingo@xxxxxxx> wrote: > > This code is very much tied with the kernel scheduler. [...] > > It would not be particularly complex to enable user-space to > request a callback on context switch events. > > I was thinking on and off about allowing perf events to generate a > per sampling event notification signal on specific events, such as > page faults or context switches. I was thinking about that on and off so loudly that Peter implemented it long ago via fasync support on the perf event fd! :-) So if you set a notification signal via fcntl(F_SETOWN) on the scheduler context switch event fd, the user-space RCU code will get a signal on every context switch. I have not tried it for this purpose yet, so let us know if there are unexpected complications :) 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
