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From: Steven Rostedt <rostedt@goodmis.org>
To: linux-kernel@vger.kernel.org
Cc: Ingo Molnar <mingo@elte.hu>,
	Andrew Morton <akpm@linux-foundation.org>,
	Hillf Danton <dhillf@gmail.com>,
	Yong Zhang <yong.zhang0@gmail.com>
Subject: [PATCH 1/2] sched: Fix need_resched() when checking peempt
Date: Tue, 14 Jun 2011 18:36:24 -0400
Message-ID: <20110614223657.450239027@goodmis.org> (raw)
In-Reply-To: <20110614223623.876681637@goodmis.org>


[-- Attachment #0: 0001-sched-Fix-need_resched-when-checking-peempt.patch --]
[-- Type: text/plain, Size: 1065 bytes --]

From: Hillf Danton <dhillf@gmail.com>

The RT preempt check tests the wrong task if NEED_RESCHED is set. It currently
checks the local CPU task. It is suppose to check the task that is running on
the run queue we are about to wake another task on.

Signed-off-by: Hillf Danton <dhillf@gmail.com>
Link: http://lkml.kernel.org/r/BANLkTi=e=69xvJZ1+56xzuFyhmdN0hZHRQ@mail.gmail.com
Reviewed-by: Yong Zhang <yong.zhang0@gmail.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
---
 kernel/sched_rt.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/kernel/sched_rt.c b/kernel/sched_rt.c
index 88725c9..9b8d5dc 100644
--- a/kernel/sched_rt.c
+++ b/kernel/sched_rt.c
@@ -1096,7 +1096,7 @@ static void check_preempt_curr_rt(struct rq *rq, struct task_struct *p, int flag
 	 * to move current somewhere else, making room for our non-migratable
 	 * task.
 	 */
-	if (p->prio == rq->curr->prio && !need_resched())
+	if (p->prio == rq->curr->prio && !test_tsk_need_resched(rq->curr))
 		check_preempt_equal_prio(rq, p);
 #endif
 }
-- 
1.7.4.4



  reply index

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-06-14 22:36 [PATCH 0/2] [GIT PULL][v3.0] sched: various fixes Steven Rostedt
2011-06-14 22:36 ` Steven Rostedt [this message]
2011-06-15  9:50   ` [tip:sched/urgent] sched: Fix need_resched() when checking peempt tip-bot for Hillf Danton
2011-06-14 22:36 ` [PATCH 2/2] sched: Check if lowest_mask is initialized in find_lowest_rq Steven Rostedt
2011-06-15  0:40   ` Paul E. McKenney
2011-06-15  8:17   ` Peter Zijlstra
2011-06-15  9:50   ` [tip:sched/urgent] sched: Check if lowest_mask is initialized in find_lowest_rq() tip-bot for Steven Rostedt

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