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    SubjectRe: [RFC] Patch: dynticks: idle load balancing

    * Siddha, Suresh B <suresh.b.siddha@intel.com> wrote:

    > Appended patch attempts to fix the process idle load balancing in the
    > presence of dynticks. cpus for which ticks are stopped will sleep till
    > the next event wakes it up. Potentially these sleeps can be for large
    > durations and during which today, there is no idle load balancing
    > being done. There was some discussion happened(last year) on this
    > topic on lkml, where two main approaches were gettting debated. One is
    > to back off the idle load balancing for bigger intervals and the
    > second is a watchdog mechanism where the busy cpu will trigger the
    > load balance on an idle cpu. Both of these mechanisms have its
    > drawbacks.

    nice work! I have added your patch to -rt. Btw., it needs the patch
    below to work on 64-bit.

    Ingo

    Index: linux/kernel/sched.c
    ===================================================================
    --- linux.orig/kernel/sched.c
    +++ linux/kernel/sched.c
    @@ -1170,7 +1170,7 @@ static void resched_task(struct task_str
    static void resched_cpu(int cpu)
    {
    struct rq *rq = cpu_rq(cpu);
    - unsigned int flags;
    + unsigned long flags;

    spin_lock_irqsave(&rq->lock, flags);
    resched_task(cpu_curr(cpu));
    -
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