Revert "sched/fair: Fix fairness issue on migration"

53d3bc77 · Ingo Molnar <[email protected]> · 2016-05-11 08:25:53 +02:00

Mike reported that this recent commit:

  3a47d5124a95 ("sched/fair: Fix fairness issue on migration")

... broke interactivity and the signal starvation test.

We have a proper fix series in the works but ran out of time for
v4.6, so revert the commit.

Reported-by: Mike Galbraith <[email protected]>
Acked-by: Peter Zijlstra <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: [email protected]
Signed-off-by: Ingo Molnar <[email protected]>

Commit: 53d3bc773eaa7ab1cf63585e76af7ee869d5e709
Parents: c5114626

Changes

1 files changed · +6 −14

File	Status	Add	Del	Content
kernel/sched/fair.c	modified	+6	−14	View file

kernel/sched/fair.c

View file

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 40748dc..e7dd0ec 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -3188,25 +3188,17 @@ static inline void check_schedstat_required(void)
 static void
 enqueue_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, int flags)
 {
-	bool renorm = !(flags & ENQUEUE_WAKEUP) || (flags & ENQUEUE_WAKING);
-	bool curr = cfs_rq->curr == se;
-
 	/*
-	 * If we're the current task, we must renormalise before calling
-	 * update_curr().
+	 * Update the normalized vruntime before updating min_vruntime
+	 * through calling update_curr().
 	 */
-	if (renorm && curr)
+	if (!(flags & ENQUEUE_WAKEUP) || (flags & ENQUEUE_WAKING))
 		se->vruntime += cfs_rq->min_vruntime;
 
-	update_curr(cfs_rq);
-
 	/*
-	 * Otherwise, renormalise after, such that we're placed at the current
-	 * moment in time, instead of some random moment in the past.
+	 * Update run-time statistics of the 'current'.
 	 */
-	if (renorm && !curr)
-		se->vruntime += cfs_rq->min_vruntime;
-
+	update_curr(cfs_rq);
 	enqueue_entity_load_avg(cfs_rq, se);
 	account_entity_enqueue(cfs_rq, se);
 	update_cfs_shares(cfs_rq);
@@ -3222,7 +3214,7 @@ enqueue_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, int flags)
 		update_stats_enqueue(cfs_rq, se);
 		check_spread(cfs_rq, se);
 	}
-	if (!curr)
+	if (se != cfs_rq->curr)
 		__enqueue_entity(cfs_rq, se);
 	se->on_rq = 1;
 