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From: Gregory Haskins <ghaskins@novell.com>
To: linux-rt-users@vger.kernel.org
Cc: linux-kernel@vger.kernel.org,
	Gregory Haskins <ghaskins@novell.com>,
	Steven Rostedt <rostedt@goodmis.org>,
	Dmitry Adamushko <dmitry.adamushko@gmail.com>,
	Peter Zijlstra <a.p.zijlstra@chello.nl>,
	Ingo Molnar <mingo@elte.hu>, Darren Hart <dvhltc@us.ibm.com>
Subject: [PATCH 02/13] RT: Condense the next-task search into one function
Date: Tue, 23 Oct 2007 12:50:34 -0400	[thread overview]
Message-ID: <20071023165034.5536.502.stgit@novell1.haskins.net> (raw)
In-Reply-To: <20071023164156.5536.95573.stgit@novell1.haskins.net>

We inadvertently added a redundant function, so clean it up

Signed-off-by: Gregory Haskins <ghaskins@novell.com>
---

 kernel/sched.c    |    9 +++++----
 kernel/sched_rt.c |   44 --------------------------------------------
 2 files changed, 5 insertions(+), 48 deletions(-)

diff --git a/kernel/sched.c b/kernel/sched.c
index 0dabf89..daeb8ed 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -1471,9 +1471,10 @@ next_in_queue:
 	 * Return the highest-prio non-running RT task (if task
 	 * may run on this CPU):
 	 */
-	if (!task_running(src_rq, tmp) &&
-				cpu_isset(this_cpu, tmp->cpus_allowed))
-		return tmp;
+	if (!task_running(src_rq, tmp)) {
+		if ((this_cpu == -1) || cpu_isset(this_cpu, tmp->cpus_allowed))
+			return tmp;
+	}
 
 	curr = curr->next;
 	if (curr != head)
@@ -1569,7 +1570,7 @@ static int push_rt_task(struct rq *this_rq)
 
 	assert_spin_locked(&this_rq->lock);
 
-	next_task = rt_next_highest_task(this_rq);
+	next_task = pick_rt_task(this_rq, -1);
 	if (!next_task)
 		return 0;
 
diff --git a/kernel/sched_rt.c b/kernel/sched_rt.c
index 8d59e62..369827b 100644
--- a/kernel/sched_rt.c
+++ b/kernel/sched_rt.c
@@ -96,50 +96,6 @@ static struct task_struct *pick_next_task_rt(struct rq *rq)
 	return next;
 }
 
-#ifdef CONFIG_PREEMPT_RT
-static struct task_struct *rt_next_highest_task(struct rq *rq)
-{
-	struct rt_prio_array *array = &rq->rt.active;
-	struct task_struct *next;
-	struct list_head *queue;
-	int idx;
-
-	if (likely (rq->rt_nr_running < 2))
-		return NULL;
-
-	idx = sched_find_first_bit(array->bitmap);
-	if (idx >= MAX_RT_PRIO) {
-		WARN_ON(1); /* rt_nr_running is bad */
-		return NULL;
-	}
-
-	queue = array->queue + idx;
-	next = list_entry(queue->next, struct task_struct, run_list);
-	if (unlikely(next != current))
-		return next;
-
-	if (queue->next->next != queue) {
-		/* same prio task */
-		next = list_entry(queue->next->next, struct task_struct, run_list);
-		goto out;
-	}
-
-	/* slower, but more flexible */
-	idx = find_next_bit(array->bitmap, MAX_RT_PRIO, idx+1);
-	if (idx >= MAX_RT_PRIO) {
-		WARN_ON(1); /* rt_nr_running was 2 and above! */
-		return NULL;
-	}
-
-	queue = array->queue + idx;
-	next = list_entry(queue->next, struct task_struct, run_list);
-
- out:
-	return next;
-
-}
-#endif /* CONFIG_PREEMPT_RT */
-
 static void put_prev_task_rt(struct rq *rq, struct task_struct *p)
 {
 	update_curr_rt(rq);


  parent reply	other threads:[~2007-10-23 17:06 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-10-23 16:50 [PATCH 00/13] Balance RT tasks v5 Gregory Haskins
2007-10-23 16:50 ` [PATCH 01/13] RT: push-rt Gregory Haskins
2007-10-23 16:50 ` Gregory Haskins [this message]
2007-10-23 16:50 ` [PATCH 03/13] RT: Add a per-cpu rt_overload indication Gregory Haskins
2007-10-23 16:50 ` [PATCH 04/13] RT: Wrap the RQ notion of priority to make it conditional Gregory Haskins
2007-10-23 16:50 ` [PATCH 05/13] RT: Initialize the priority value Gregory Haskins
2007-10-23 16:50 ` [PATCH 06/13] RT: Maintain the highest RQ priority Gregory Haskins
2007-10-23 16:50 ` [PATCH 07/13] RT: Clean up some of the push-rt logic Gregory Haskins
2007-10-23 16:51 ` [PATCH 08/13] RT: Add support for low-priority wake-up to push_rt feature Gregory Haskins
2007-10-23 16:51 ` [PATCH 09/13] RT: Only dirty a cacheline if the priority is actually changing Gregory Haskins
2007-10-23 16:51 ` [PATCH 10/13] RT: Fixes for push-rt patch Gregory Haskins
2007-10-23 16:51 ` [PATCH 11/13] RT: Condense NORMAL and IDLE priorities Gregory Haskins
2007-10-23 16:51 ` [PATCH 12/13] RT: CPU priority management Gregory Haskins
2007-10-23 16:51 ` [PATCH 13/13] RT: Cache cpus_allowed weight for optimizing migration Gregory Haskins
2007-10-24  0:19   ` Ingo Oeser
2007-10-24  3:20     ` Gregory Haskins

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