Re: [PATCH] perfcounters: Make s/w counters in a group only countwhen group is on

From: Ingo Molnar
Date: Sat Mar 14 2009 - 07:51:30 EST



* Paul Mackerras <paulus@xxxxxxxxx> wrote:

> Peter Zijlstra writes:
>
> > The issue I have with your approach is two-fold:
> > - it breaks the symmetry between software and hardware counters by
> > treating them differently.
>
> So... I was about to restore that symmetry by implementing
> lazy PMU context switching. [...]

That would be _really_ neat to have.

Ingo
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