Re: [RFC][PATCH 5/5] perfcounter: Add support for kernel hardwarebreakpoints

[Peter Zijlstra]

On Tue, 2009-07-28 at 03:03 +0200, Frederic Weisbecker wrote:
> > Thirdly, we can multiplex perf counters beyond their hardware maximum,
> > something you simply cannot do for a debug interface.
> 
> 
> Again, I'm stuck in what you mean by multiplexing here :-)

If you'd create say 16 breakpoint counters, we'd RR them over the 4
available hardware breakpoints (or less when others are taken by someone
else).

Since its all statistics anyway, we can simply scale the event counts up
by the time-share they received.

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