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    SubjectRe: [RFC][PATCH] perf_events, x86: PEBS support
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    On Tue, 2010-02-02 at 19:26 +0100, Ingo Molnar wrote:
    > * Peter Zijlstra <peterz@infradead.org> wrote:

    > > @@ -203,8 +203,9 @@ struct perf_event_attr {
    > > enable_on_exec : 1, /* next exec enables */
    > > task : 1, /* trace fork/exit */
    > > watermark : 1, /* wakeup_watermark */
    > > + precise : 1,
    >
    > I think we want to default to precise events even if not specifically
    > requested by user-space, in the cases where that's possible on the CPU
    > without additional limitations.
    >
    > That way people will default to better (and possibly cheaper) PEBS profiling
    > on modern Intel CPUs.

    Sure, I'll look at that once it starts working :-)



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