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    Subject[tip:sched/core] sched/nohz: Correctly initialize 'next_balance' in 'nohz' idle balancer
    Commit-ID:  554cecaf733623b327eef9652b65965eb1081b81
    Gitweb: http://git.kernel.org/tip/554cecaf733623b327eef9652b65965eb1081b81
    Author: Diwakar Tundlam <dtundlam@nvidia.com>
    AuthorDate: Wed, 7 Mar 2012 14:44:26 -0800
    Committer: Ingo Molnar <mingo@elte.hu>
    CommitDate: Mon, 12 Mar 2012 20:43:16 +0100

    sched/nohz: Correctly initialize 'next_balance' in 'nohz' idle balancer

    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 <dtundlam@nvidia.com>
    Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
    Link: http://lkml.kernel.org/r/1DD7BFEDD3147247B1355BEFEFE4665237994F30EF@HQMAIL04.nvidia.com
    Signed-off-by: Ingo Molnar <mingo@elte.hu>
    ---
    kernel/sched/fair.c | 1 +
    1 files changed, 1 insertions(+), 0 deletions(-)

    diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
    index def17aa..11f3979 100644
    --- a/kernel/sched/fair.c
    +++ b/kernel/sched/fair.c
    @@ -5571,6 +5571,7 @@ __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);
    #endif

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