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    Subject[PATCH tip/core/rcu 08/26] rcu: Priority-boost-related sleeps to idle priority
    Date
    From: "Paul E. McKenney" <paulmck@kernel.org>

    This commit converts the long-standing schedule_timeout_interruptible()
    call used by RCU's priority-boosting kthreads to schedule_timeout_idle().
    This conversion avoids polluting the load-average with RCU-related
    sleeping.

    Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
    ---
    kernel/rcu/tree_plugin.h | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    diff --git a/kernel/rcu/tree_plugin.h b/kernel/rcu/tree_plugin.h
    index 3522236..25296c1 100644
    --- a/kernel/rcu/tree_plugin.h
    +++ b/kernel/rcu/tree_plugin.h
    @@ -1033,7 +1033,7 @@ static int rcu_boost_kthread(void *arg)
    if (spincnt > 10) {
    WRITE_ONCE(rnp->boost_kthread_status, RCU_KTHREAD_YIELDING);
    trace_rcu_utilization(TPS("End boost kthread@rcu_yield"));
    - schedule_timeout_interruptible(2);
    + schedule_timeout_idle(2);
    trace_rcu_utilization(TPS("Start boost kthread@rcu_yield"));
    spincnt = 0;
    }
    --
    2.9.5
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