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    SubjectRe: [RFC][PATCH 5/5] perfcounter: Add support for kernel hardware breakpoints
    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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