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    SubjectRe: [patch 0/3] [Announcement] Performance Counters for Linux
    On Fri, 05 Dec 2008 00:07:16 -0800 (PST)
    David Miller <davem@davemloft.net> wrote:

    > These things aren't measuring time, or even just cycles, they
    > are measuring things like L2 cache misses, cpu cycles, and
    > other similar kinds of events.
    >
    > So these counters are going to measure all of the damn crap
    > assosciated with doing the read() call as well as the real work
    > the task does.

    as you said before, not if you do the read() from a thread that's
    exempt from the profiling.

    --
    Arjan van de Ven Intel Open Source Technology Centre
    For development, discussion and tips for power savings,
    visit http://www.lesswatts.org


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