> > > - get confirmation that clearing GLOBAL_CTRL is suffient to supress
> > > PEBS, in which case we can simply remove the PEBS_ENABLE clear.
> >
> > How should we confirm this? Can we run some tests for this? Or do we
> > need hardware experts' input for this?
>
> I'll put it on the list to ask the hardware people when I talk to them next. But
> maybe Kan or Andi know without asking.
If the GLOBAL_CTRL is explicitly disabled, the counters do not count anymore.
It doesn't matter if PEBS is enabled or not.
See 6c1c07b33eb0 ("perf/x86/intel: Avoid unnecessary PEBS_ENABLE MSR
access in PMI "). We optimized the PMU handler base on it.
Thanks,
Kan
