linux-kernel - [patch] DLS: fix switched_from

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Date:	Tue, 10 Apr 2012 22:25:33 +0800
From:	Hillf Danton <dhillf@...il.com>
To:	Dario Faggioli <raistlin@...ux.it>,
	Juri Lelli <juri.lelli@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Hillf Danton <dhillf@...il.com>
Subject: [patch] DLS: fix switched_from_dl

Pull only if the current task switches from DLS, since it was not preempted
by pushable tasks waiting on other runqueues.

Signed-off-by: Hillf Danton <dhillf@...il.com>
---

--- a/kernel/sched_dl.c	Mon Apr  9 19:39:56 2012
+++ b/kernel/sched_dl.c	Tue Apr 10 21:23:52 2012
@@ -1466,12 +1466,7 @@ static void switched_from_dl(struct rq *
 		hrtimer_try_to_cancel(&p->dl.dl_timer);

 #ifdef CONFIG_SMP
-	/*
-	 * Since this might be the only -deadline task on the rq,
-	 * this is the right place to try to pull some other one
-	 * from an overloaded cpu, if any.
-	 */
-	if (!rq->dl.dl_nr_running)
+	if (p == rq->curr)
 		pull_dl_task(rq);
 #endif
 }
--
--
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