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SubjectRe: [RFC][PATCH 5/5] perfcounter: Add support for kernel hardware breakpoints
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On Tue, 2009-07-28 at 02:18 +0200, Frederic Weisbecker wrote:
>
> I still don't understand why it is needed to reserve breakpoints for
> a group of monitored tasks. Once they have registered their breakpoints,
> the number of necessary hardware registers for these will be available
> every time the task is scheduled.

Its possible to create >4 breakpoint counters. We time-share them.

The only constraint we have is that those within a group should be on
the 'PMU' at the same time.

If you have no groups, a single available breakpoint slot should suffice
for any configuration (although more is better), but if you get groups
you have to guarantee your created group can run.



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