linux-kernel - [PATCH 1/5] RT - fix for scheduling issue

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Date:	Tue, 09 Oct 2007 10:25:49 -0400
From:	Gregory Haskins <ghaskins@...ell.com>
To:	mingo@...e.hu, linux-rt-users@...r.kernel.org, rostedt@...dmis.org
Cc:	kravetz@...ibm.com, linux-kernel@...r.kernel.org,
	ghaskins@...ell.com, pmorreale@...ell.com, sdietrich@...ell.com
Subject: [PATCH 1/5] RT - fix for scheduling issue

From: Mike Kravetz <kravetz@...ibm.com>

RESCHED_IPIs can be missed if more than one RT task is awoken simultaneously

Signed-off-by: Steven Rostedt <rostedt@...dmis.org>
Signed-off-by: Gregory Haskins <ghaskins@...ell.com>
---

 kernel/sched.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/kernel/sched.c b/kernel/sched.c
index 93fd6de..3e75c62 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -2207,7 +2207,7 @@ static inline void finish_task_switch(struct rq *rq, struct task_struct *prev)
 	 * If we pushed an RT task off the runqueue,
 	 * then kick other CPUs, they might run it:
 	 */
-	if (unlikely(rt_task(current) && prev->se.on_rq && rt_task(prev))) {
+	if (unlikely(rt_task(current) && rq->rt_nr_running > 1)) {
 		schedstat_inc(rq, rto_schedule);
 		smp_send_reschedule_allbutself_cpumask(current->cpus_allowed);
 	}

-
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