---

yaml --- r: 54759 b: refs/heads/master c: 4953198 h: refs/heads/master i: 54757: c04ac4c 54755: 053cfa9 54751: 9f8bc2e v: v3
git-mirror · May 8, 2007 · a1adf2b · a1adf2b
1 parent 4b92744
commit a1adf2b
Show file tree

Hide file tree

Showing 2 changed files with 11 additions and 2 deletions.
diff --git a/[refs] b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 5517d86bea237c1d7078840182d9ebc0fe4c1afc
+refs/heads/master: 4953198b6ce07b008b0f1c2edd41c9d027a118b4
diff --git a/trunk/kernel/sched.c b/trunk/kernel/sched.c
@@ -1406,7 +1406,16 @@ static int wake_idle(int cpu, struct task_struct *p)
 	struct sched_domain *sd;
 	int i;
 
-	if (idle_cpu(cpu))
+	/*
+	 * If it is idle, then it is the best cpu to run this task.
+	 *
+	 * This cpu is also the best, if it has more than one task already.
+	 * Siblings must be also busy(in most cases) as they didn't already
+	 * pickup the extra load from this cpu and hence we need not check
+	 * sibling runqueue info. This will avoid the checks and cache miss
+	 * penalities associated with that.
+	 */
+	if (idle_cpu(cpu) || cpu_rq(cpu)->nr_running > 1)
 		return cpu;
 
 	for_each_domain(cpu, sd) {