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    SubjectRe: [PATCH] perf: Don't schedule tracepoints when exclude_kernel is set

    * Peter Zijlstra <a.p.zijlstra@chello.nl> wrote:

    > On Fri, 2011-04-08 at 22:57 +0200, Frederic Weisbecker wrote:
    > > Instead of checking attr.exclude_kernel anytime a tracepoint
    > > event triggers, simply don't schedule the tracepoint it that
    > > attribute is set. This makes one test less in the tracing
    > > path.
    >
    > Meh, I'd much rather someone spend some time on finishing the below,
    > which is a much bigger improvement for trace-events.
    >
    > ---
    > Subject: perf: Tracepoint collection support
    > From: Peter Zijlstra <a.p.zijlstra@chello.nl>
    > Date: Sat Nov 20 18:09:34 CET 2010
    >
    > Due to popular demand this implements a tracepoint collection event
    > { .type = PERF_TYPE_TRACEPOINT, .config = ~0ULL }. by default it
    > contains no tracepoints, but tracepoints can be added using:
    > ioctl(fd, PERF_EVENT_IOC_ADD_TP, tp_id);

    +1 !!!

    This is like a super-important feature.

    Thanks,

    Ingo


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