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    SubjectRe: [RFC PATCH] perf: Add load latency monitoring on Intel Nehalem/Westmere
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    On Wed, 2010-12-22 at 18:45 +0800, Peter Zijlstra wrote:
    > On Wed, 2010-12-22 at 11:08 +0100, Stephane Eranian wrote:
    > > Yes, I think there is more to it than just data source, unfortunately.
    > > If you want to avoid returning an opaque u64 (PERF_SAMPLE_EXTRA), then
    > > you need to break it down: PERF_SAMPLE_DATA_SRC, PERF_SAMPLE_XX
    > > and so on.
    >
    > I guess we can do things like:
    >
    > Satisfied by {L1, L2, L3, RAM}x{snoop, local, remote} + unknown, and
    > encode "Pending core cache HIT" as L2-snoop or something, whatever is
    > most appropriate.
    >
    > But does that cover every architecture?
    >
    > Also, since that doesn't require more that 4 bits to encode, we could
    > try and categorize what else is around and try and create a well
    > specified _EXTRA register, I mean, we still got 60bits left after this.

    Could you tell more about this well specified _EXTRA register?




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