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    SubjectRe: [RFC PATCH 0/4] timers: framework for migration between CPU

    * 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.

    Ingo


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