From: tip-bot for Wanpeng Li <tipbot@zytor.com>
To: linux-tip-commits@vger.kernel.org
Cc: peterz@infradead.org, wanpeng.li@linux.intel.com,
mingo@kernel.org, hpa@zytor.com, torvalds@linux-foundation.org,
tglx@linutronix.de, ktkhai@parallels.com,
linux-kernel@vger.kernel.org, juri.lelli@arm.com
Subject: [tip:sched/core] sched/deadline: Fix hrtick for a non-leftmost task
Date: Wed, 4 Feb 2015 06:34:52 -0800 [thread overview]
Message-ID: <tip-a7bebf488791aa1036f3e6629daf01d01f705dcb@git.kernel.org> (raw)
In-Reply-To: <1416962647-76792-2-git-send-email-wanpeng.li@linux.intel.com>
Commit-ID: a7bebf488791aa1036f3e6629daf01d01f705dcb
Gitweb: http://git.kernel.org/tip/a7bebf488791aa1036f3e6629daf01d01f705dcb
Author: Wanpeng Li <wanpeng.li@linux.intel.com>
AuthorDate: Wed, 26 Nov 2014 08:44:01 +0800
Committer: Ingo Molnar <mingo@kernel.org>
CommitDate: Wed, 4 Feb 2015 07:52:25 +0100
sched/deadline: Fix hrtick for a non-leftmost task
After update_curr_dl() the current task might not be the leftmost task
anymore. In that case do not start a new hrtick for it.
In this case NEED_RESCHED will be set and the next schedule will start
the hrtick for the new task if and when appropriate.
Signed-off-by: Wanpeng Li <wanpeng.li@linux.intel.com>
Acked-by: Juri Lelli <juri.lelli@arm.com>
[ Rewrote the changelog and comment. ]
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Kirill Tkhai <ktkhai@parallels.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: http://lkml.kernel.org/r/1416962647-76792-2-git-send-email-wanpeng.li@linux.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
kernel/sched/deadline.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c
index e0e9c29..7b684f9 100644
--- a/kernel/sched/deadline.c
+++ b/kernel/sched/deadline.c
@@ -1073,7 +1073,13 @@ static void task_tick_dl(struct rq *rq, struct task_struct *p, int queued)
{
update_curr_dl(rq);
- if (hrtick_enabled(rq) && queued && p->dl.runtime > 0)
+ /*
+ * Even when we have runtime, update_curr_dl() might have resulted in us
+ * not being the leftmost task anymore. In that case NEED_RESCHED will
+ * be set and schedule() will start a new hrtick for the next task.
+ */
+ if (hrtick_enabled(rq) && queued && p->dl.runtime > 0 &&
+ is_leftmost(p, &rq->dl))
start_hrtick_dl(rq, p);
}
next prev parent reply other threads:[~2015-02-04 14:35 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-11-26 0:44 [PATCH v6 0/7] sched: support dl task migration during cpu hotplug and other fixes Wanpeng Li
2014-11-26 0:44 ` [PATCH v6 1/7] sched/deadline: fix start high-res preemption tick for a non-leftmost task Wanpeng Li
2015-02-04 14:34 ` tip-bot for Wanpeng Li [this message]
2014-11-26 0:44 ` Wanpeng Li
2014-11-26 0:34 ` Wanpeng Li
2014-11-26 0:44 ` [PATCH v6 3/7] sched/deadline: fix dl entity is still mark yield after replenishing Wanpeng Li
2015-02-04 14:35 ` [tip:sched/core] sched/deadline: Fix stale yield state tip-bot for Peter Zijlstra
2014-11-26 0:44 ` [PATCH v6 4/7] sched/deadline: reduce overhead if there are no scheduling parameters changed Wanpeng Li
2015-02-04 14:35 ` [tip:sched/core] sched/deadline: Avoid pointless __setscheduler() tip-bot for Wanpeng Li
2014-11-26 0:44 ` [PATCH v6 5/7] sched/fair: fix idle balance when remaining tasks are all non-CFS tasks Wanpeng Li
2015-01-19 12:45 ` Peter Zijlstra
2015-01-19 17:48 ` Tim Chen
2015-01-19 23:16 ` Wanpeng Li
2015-01-19 23:18 ` Wanpeng Li
2015-01-22 4:05 ` Wanpeng Li
2015-01-22 18:13 ` Tim Chen
2014-11-26 0:44 ` [PATCH v6 6/7] sched: fix start hrtick for short schedule slices on UP Wanpeng Li
2015-02-04 14:35 ` [tip:sched/core] sched: Fix hrtick_start() " tip-bot for Wanpeng Li
2014-11-26 0:44 ` [PATCH v6 7/7] sched/deadline: support dl task migration during cpu hotplug Wanpeng Li
2014-12-18 1:28 ` [PATCH v6 0/7] sched: support dl task migration during cpu hotplug and other fixes Wanpeng Li
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