On Wed, Aug 28, 2019 at 12:04:45PM -0700, Andi Kleen wrote: > > > NMI > > > ====== > > > > > > The METRICS register may be overflow. The bit 48 of STATUS register > > > will be set. If so, update all active slots and metrics events. > > > > that happen? It would be useful to get that METRIC_OVF (can we please > > This happens when the internal counters that feed the metrics > overflow. > > > If this is so; then we can use this to update/reset PERF_METRICS and > > nothing else. > > It has to be handled in the PMI.
That's what I wrote; Overflow is always NMI. > > Then there is no mucking about with that odd counter/metrics msr pair > > reset nonsense. Becuase that really stinks. > > You have to write them to reset the internal counters. But not for ever read, only on METRIC_OVF.
