On Wed, Aug 03, 2016 at 11:57:05AM -0700, Brendan Gregg wrote: > As for pmu tracepoints: if I were to instrument it (although I wasn't > planning to), I'd put a tracepoint in perf_event_overflow() called > "perf:perf_overflow", with the same arguments. That could then be used > for all PMU overflow events, without needing to add specific > tracepoints.
Could we not teach BPF to replace event->overflow_handler and inject itself there? We don't currently have nice interfaces for doing that, but it should be possible to do I think. We already have the indirect function call, so injecting ourself there has 0 overhead.
