sched: fix sync wakeups

[safe/jmp/linux-2.6] / kernel / sched.c

diff --git a/kernel/sched.c b/kernel/sched.c
index 52bbf1c..770b1f9 100644 (file)
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -2266,6 +2266,10 @@ static int try_to_wake_up(struct task_struct *p, unsigned int state, int sync)
        if (!sched_feat(SYNC_WAKEUPS))
                sync = 0;
 
+       if (!sync && (current->se.avg_overlap < sysctl_sched_migration_cost &&
+                           p->se.avg_overlap < sysctl_sched_migration_cost))
+               sync = 1;
+
 #ifdef CONFIG_SMP
        if (sched_feat(LB_WAKEUP_UPDATE)) {
                struct sched_domain *sd;