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    SubjectRe: perfmon2 merge news
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    From: dean gaudet <dean@arctic.org>
    Date: Fri, 16 Nov 2007 09:51:08 -0800 (PST)

    > On Fri, 16 Nov 2007, Andi Kleen wrote:
    >
    > > I didn't see a clear list.
    >
    > - cross platform extensible API for configuring perf counters
    > - support for multiplexed counters
    > - support for virtualized 64-bit counters
    > - support for PC and call graph sampling at specific intervals
    > - support for reading counters not necessarily with sampling
    > - taskswitch support for counters
    > - API available from userland
    > - ability to self-monitor: need select/poll/etc interface
    > - support for PEBS, IBS and whatever other new perf monitoring
    > infrastructure the vendors through at us in the future
    > - low overhead: must minimize the "probe effect" of monitoring
    > - low noise in measurements: cannot achieve this in userland
    >
    > permon2 has all of this and more i've probably neglected...

    I want to state that even though I've been a stickler on the system
    call stuff, in general I want to see perfmon2 go into tree and I agree
    with how most of the infrastructure is implemented and the features it
    provides.
    -
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