linux-kernel - [git pull] scheduler fixes

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Message-ID: <20080623194345.GA30767@elte.hu>
Date:	Mon, 23 Jun 2008 21:43:45 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: [git pull] scheduler fixes

Linus,

please pull the latest scheduler fixes git tree from:

   git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip.git sched-fixes-for-linus

(note: i included the related wait_for_completion_timeout() cleanup from 
Oleg as well because it was tested together.)

	Ingo

------------------>
Oleg Nesterov (1):
      sched: refactor wait_for_completion_timeout()

Peter Zijlstra (1):
      sched: rt: dont stop the period timer when there are tasks wanting to run

Roland Dreier (1):
      sched: fix wait_for_completion_timeout() spurious failure under heavy load

 kernel/sched.c    |   14 ++++++--------
 kernel/sched_rt.c |    3 ++-
 2 files changed, 8 insertions(+), 9 deletions(-)

diff --git a/kernel/sched.c b/kernel/sched.c
index b048ad8..3aaa5c8 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -4398,22 +4398,20 @@ do_wait_for_common(struct completion *x, long timeout, int state)
 			     signal_pending(current)) ||
 			    (state == TASK_KILLABLE &&
 			     fatal_signal_pending(current))) {
-				__remove_wait_queue(&x->wait, &wait);
-				return -ERESTARTSYS;
+				timeout = -ERESTARTSYS;
+				break;
 			}
 			__set_current_state(state);
 			spin_unlock_irq(&x->wait.lock);
 			timeout = schedule_timeout(timeout);
 			spin_lock_irq(&x->wait.lock);
-			if (!timeout) {
-				__remove_wait_queue(&x->wait, &wait);
-				return timeout;
-			}
-		} while (!x->done);
+		} while (!x->done && timeout);
 		__remove_wait_queue(&x->wait, &wait);
+		if (!x->done)
+			return timeout;
 	}
 	x->done--;
-	return timeout;
+	return timeout ?: 1;
 }
 
 static long __sched
diff --git a/kernel/sched_rt.c b/kernel/sched_rt.c
index 1dad5bb..0f3c191 100644
--- a/kernel/sched_rt.c
+++ b/kernel/sched_rt.c
@@ -250,7 +250,8 @@ static int do_sched_rt_period_timer(struct rt_bandwidth *rt_b, int overrun)
 			if (rt_rq->rt_time || rt_rq->rt_nr_running)
 				idle = 0;
 			spin_unlock(&rt_rq->rt_runtime_lock);
-		}
+		} else if (rt_rq->rt_nr_running)
+			idle = 0;
 
 		if (enqueue)
 			sched_rt_rq_enqueue(rt_rq);
--
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