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    SubjectRe: [RFC PATCH 0/4] timers: framework for migration between CPU
    * Ingo Molnar <mingo@elte.hu> [2009-02-23 12:07:25]:

    >
    > * Vaidyanathan Srinivasan <svaidy@linux.vnet.ibm.com> wrote:
    >
    > > My understanding is that we will certainly have a sysfs
    > > tunable to 'enable' timer migration or consolidation, similar
    > > to the sched_mc=2 policy, but the actual set of CPUs to
    > > evacuate and the correct set of target CPUs to consolidate
    > > should come from the scheduler and not necessarily from the
    > > user space.
    >
    > Yes.
    >
    > > The scheduler should be able to figure out the following
    > > parameters:
    > >
    > > * Identify set of idle CPUs (CPU package) from which timers
    > > can be removed
    > > * Identify a semi-idle or idle CPU package to which the timers
    > > can be moved
    > > * Decide when to start moving timers as the system has large
    > > number of idle CPUs
    > > * Decide when to stop migrating as system becomes less idle
    > > and utilisation increases
    > >
    > > Guiding all of the above decisions from user space may not be
    > > fast enough.
    >
    > Exactly.
    >

    OK, lets head that way for now. I've highlighted my concerns in a
    different email. Experimentation will definitely show us if they are
    justified or not.

    --
    Balbir


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