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    Subject[PATCH 3/3] sched: do not consider SCHED_IDLE tasks to be cache hot
    Date
    This patch adds a check in task_hot to return if the task has SCHED_IDLE
    policy. SCHED_IDLE tasks have very low weight, and when run with regular
    weight tasks, are typically scheduled many milliseconds apart. There is no
    benefit from considering SCHED_IDLE tasks cache hot for load balancing.

    Signed-off-by: Nikhil Rao <ncrao@google.com>
    ---
    kernel/sched.c | 3 +++
    1 files changed, 3 insertions(+), 0 deletions(-)

    diff --git a/kernel/sched.c b/kernel/sched.c
    index ed09d4f..874efde 100644
    --- a/kernel/sched.c
    +++ b/kernel/sched.c
    @@ -2003,6 +2003,9 @@ task_hot(struct task_struct *p, u64 now, struct sched_domain *sd)
    if (p->sched_class != &fair_sched_class)
    return 0;

    + if (p->policy == SCHED_IDLE)
    + return 0;
    +
    /*
    * Buddy candidates are cache hot:
    */
    --
    1.7.1


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