---

yaml --- r: 158377 b: refs/heads/master c: 71a29aa h: refs/heads/master i: 158375: 10fb5bc v: v3
git-mirror · Sep 7, 2009 · a45ad0c · a45ad0c
1 parent 85e0e52
commit a45ad0c
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Showing 2 changed files with 12 additions and 2 deletions.
diff --git a/[refs] b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: cdd2ab3de4301728b20efd6225681d3ff591a938
+refs/heads/master: 71a29aa7b600595d0ef373ea605ac656876d1f2f
diff --git a/trunk/kernel/sched_fair.c b/trunk/kernel/sched_fair.c
@@ -1262,7 +1262,17 @@ wake_affine(struct sched_domain *this_sd, struct rq *this_rq,
 	tg = task_group(p);
 	weight = p->se.load.weight;
 
-	balanced = 100*(tl + effective_load(tg, this_cpu, weight, weight)) <=
+	/*
+	 * In low-load situations, where prev_cpu is idle and this_cpu is idle
+	 * due to the sync cause above having dropped tl to 0, we'll always have
+	 * an imbalance, but there's really nothing you can do about that, so
+	 * that's good too.
+	 *
+	 * Otherwise check if either cpus are near enough in load to allow this
+	 * task to be woken on this_cpu.
+	 */
+	balanced = !tl ||
+		100*(tl + effective_load(tg, this_cpu, weight, weight)) <=
 		imbalance*(load + effective_load(tg, prev_cpu, 0, weight));
 
 	/*