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    SubjectRe: [patch 02/24] perfmon: base code
    On Thu, Nov 27, 2008 at 8:35 PM, Thomas Gleixner <tglx@linutronix.de> wrote:
    > Stephane,
    >
    > On Thu, 27 Nov 2008, stephane eranian wrote:
    >
    >> >> session is independent of each other. You can therefore measure different
    >> >> things on different CPUs. Reservation is thus done independently for each
    >> >> CPU, therefore we need a cpu bitmask to track allocation.
    >> >
    >> > Ok. Question: if you do a one CPU wide session with perfom, can you
    >> > still do thread monitoring on the same CPU ?
    >> >
    >> No. They are currently mutually exclusive.
    >>
    >> > If no, what prevents that a monitored thread is migrated to such a CPU ?
    >> >
    >> Nothing. AND you don't want to change affinity because you are monitoring.
    >> So the current restriction is that cpu-wide and per-thread are
    >> mutually exclusive.
    >
    > And how is this achieved ? Currently there seems nothing which
    > prevents a per-thread vs. cpu-wide monitoring.
    >
    That's true, but that's because cpu-wide support is not included in the
    patchset.


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