Em Wed, Feb 21, 2018 at 03:31:17PM +0100, Jiri Olsa escreveu: > On Thu, Oct 05, 2017 at 07:00:29PM -0700, Andi Kleen wrote: > > From: Andi Kleen <[email protected]> > > ouch, sry for overlooking this > > > > > perf stat can retry opening events. After opening an file descriptor > > it adds the ids to the ecsel. Each event keeps a running > > count of ids. When we decide to close an evsel and retry > > with a different configuration this count needs to be reset, > > otherwise it can overflow the buffer. > > how can this happen? we call store_counter_ids at the > end of the loop, when the evsel is all done and can't > be reconfigured
Yeah, I couldn't figure out the exact sequence, but I think that we need to reset those hash tables when doing a perf_evlist__close(), no? I.e. when we open we may get new ids, so need to rehash? - Arnaldo
