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

[Peter Zijlstra]

On Thu, 2009-07-23 at 15:08 +0200, Peter Zijlstra wrote:
> On Mon, 2009-07-20 at 13:08 -0400, Frederic Weisbecker wrote:
> > This adds the support for kernel hardware breakpoints in perfcounter.
> > It is added as a new type of software counter and can be defined by
> > using the counter number 5 and by passsing the address of the
> > breakpoint to set through the config attribute.
> 
> Is there a limit to these hardware breakpoints? If so, the software
> counter model is not sufficient, since we assume we can always schedule
> all software counters. However if you were to add more counters than you
> have hardware breakpoints you're hosed.

Do the breakpoints work on virtual or physical addresses?

Also, do we have an 64bit architecture with split address-spaces?



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