[lkml]   [2009]   [Jun]   [15]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
    SubjectRe: [tip:perfcounters/core] perf_counter: x86: Fix call-chain support to use NMI-safe methods

    * Ingo Molnar <> wrote:

    > The GUP based method is pretty generic though - and can be used on
    > other architectures as well. It's not as fast as direct access
    > though.

    Another question is: your patch switches over all normal exceptions
    from IRET to hand-unroll+RET.

    It would be really nice to benchmark it (via 'perf stat' for example
    ;-) whether that's a slowdown or a speedup.

    If it's a slowdown then the decision is easy: we dont want this, we
    want to push the overhead into the sampling code, away from common

    [ If on the other hand it's a speedup of a few cycles then we have
    the problem of me suddenly liking this patch a whole lot more ;-) ]


     \ /
      Last update: 2009-06-15 20:31    [W:0.022 / U:25.660 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site