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    SubjectRe: perfmon2 merge news
    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...

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