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yaml --- r: 135673 b: refs/heads/master c: 74ab8e4 h: refs/heads/master i: 135671: ac47e73 v: v3
git-mirror · Dec 29, 2008 · dbdca65 · dbdca65
1 parent 721482c
commit dbdca65
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Showing 2 changed files with 13 additions and 1 deletion.
diff --git a/[refs] b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: a8728944efe23417e38bf22063f06d9d8ee21d59
+refs/heads/master: 74ab8e4f6412c0b2d730fe5de28dc21de8b92c01
diff --git a/trunk/kernel/sched_rt.c b/trunk/kernel/sched_rt.c
@@ -1218,6 +1218,18 @@ static int pull_rt_task(struct rq *this_rq)
 			continue;
 
 		src_rq = cpu_rq(cpu);
+
+		/*
+		 * Don't bother taking the src_rq->lock if the next highest
+		 * task is known to be lower-priority than our current task.
+		 * This may look racy, but if this value is about to go
+		 * logically higher, the src_rq will push this task away.
+		 * And if its going logically lower, we do not care
+		 */
+		if (src_rq->rt.highest_prio.next >=
+		    this_rq->rt.highest_prio.curr)
+			continue;
+
 		/*
 		 * We can potentially drop this_rq's lock in
 		 * double_lock_balance, and another CPU could