sched: symmetric sync vs avg_overlap

Reinstate the weakening of the sync hint if set. This yields a more
symmetric usage of avg_overlap.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 9 insertions, 3 deletions

diff --git a/kernel/sched.c b/kernel/sched.c
index 770b1f9ebe14..242d0d47a70d 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -2266,9 +2266,15 @@ 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;
+        if (!sync) {
+                if (current->se.avg_overlap < sysctl_sched_migration_cost &&
+                          p->se.avg_overlap < sysctl_sched_migration_cost)
+                        sync = 1;
+        } else {
+                if (current->se.avg_overlap >= sysctl_sched_migration_cost ||
+                          p->se.avg_overlap >= sysctl_sched_migration_cost)
+                        sync = 0;
+        }
 
 #ifdef CONFIG_SMP
         if (sched_feat(LB_WAKEUP_UPDATE)) {