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    SubjectRe: [PATCH 2/2] perf_events: add event constraints support for Intel processors
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    From: stephane eranian <eranian@googlemail.com>
    Date: Wed, 7 Oct 2009 14:31:58 +0200

    > What PPC does is probably the only way to do this given the interface between
    > generic and machine-specific code. The one advantage I see is that it works
    > inside an event group but also across event groups because that code does not
    > look at group boundary, it only looks at the events and the number of available
    > registers. The downside is that you duplicate state.
    >
    > Did I get this right, Paul?

    That's basically how his code works, yes. I intend on duplicating
    it to some extent on sparc64 since I'm operating in a similar
    problem space.

    So if at least some of this engine went to a generic place, there'd
    be at least a 3rd user :-)


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