On Wed, Aug 24, 2016 at 05:15:54PM +0300, Alexander Shishkin wrote: > @@ -221,10 +245,13 @@ static void __bts_event_start(struct perf_event *event) > > /* > * local barrier to make sure that ds configuration made it > - * before we enable BTS > + * before we enable BTS and bts::state goes ACTIVE > */ > wmb(); > > + /* INACTIVE/STOPPED -> ACTIVE */ > + WRITE_ONCE(bts->state, BTS_STATE_ACTIVE); > + > intel_pmu_enable_bts(config); > > }
Alexander, were you going to post a new version of this patch without the barrier confusion?
