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    Subject[PATCH] scheduler: domain: correctly initialize 'next_balance' in 'nohz' idle balancer
    scheduler: domain: init next_balance in nohz_idle_balancer with jiffies

    The 'next_balance' field of 'nohz' idle balancer must be initialized
    to jiffies. Since jiffies is initialized to negative 300 seconds the
    'nohz' idle balancer does not run for the first 300s (5mins) after
    bootup. If no new processes are spawed or no idle cycles happen, the
    load on the cpus will remain unbalanced for that duration.

    Signed-off-by: Diwakar Tundlam <>
    1 files changed, 1 insertions(+), 0 deletions(-)

    diff -up sched/fair.c{.orig,}
    --- sched/fair.c.orig 2012-03-07 08:33:03.000000000 -0800
    +++ sched/fair.c 2012-03-07 13:50:30.787265795 -0800
    @@ -5614,6 +5614,7 @@ __init void init_sched_fair_class(void)
    open_softirq(SCHED_SOFTIRQ, run_rebalance_domains);

    #ifdef CONFIG_NO_HZ
    + nohz.next_balance = jiffies;
    zalloc_cpumask_var(&nohz.idle_cpus_mask, GFP_NOWAIT);
    cpu_notifier(sched_ilb_notifier, 0);

     \ /
      Last update: 2012-03-07 23:47    [W:0.020 / U:42.460 seconds]
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