From: Thomas Gleixner <tglx@linutronix.de>
To: LKML <linux-kernel@vger.kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@elte.hu>, Carsten Emde <cbe@osadl.org>,
Mathias Weber <mathias.weber.mw1@roche.com>
Subject: [patch 2/3] sched: Implement head queueing for sched_rt
Date: Wed, 20 Jan 2010 20:59:01 -0000 [thread overview]
Message-ID: <20100120171629.772169931@linutronix.de> (raw)
In-Reply-To: <20100120171231.922420383@linutronix.de>
[-- Attachment #1: sched-implement-head-queueing-for-rt.patch --]
[-- Type: text/plain, Size: 2719 bytes --]
The ability of enqueueing a task to the head of a SCHED_FIFO priority
list is required to fix some violations of POSIX scheduling policy.
Implement the functionality in sched_rt.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
kernel/sched_rt.c | 19 +++++++++++--------
1 file changed, 11 insertions(+), 8 deletions(-)
Index: linux-2.6-tip/kernel/sched_rt.c
===================================================================
--- linux-2.6-tip.orig/kernel/sched_rt.c
+++ linux-2.6-tip/kernel/sched_rt.c
@@ -194,7 +194,7 @@ static inline struct rt_rq *group_rt_rq(
return rt_se->my_q;
}
-static void enqueue_rt_entity(struct sched_rt_entity *rt_se);
+static void enqueue_rt_entity(struct sched_rt_entity *rt_se, bool head);
static void dequeue_rt_entity(struct sched_rt_entity *rt_se);
static void sched_rt_rq_enqueue(struct rt_rq *rt_rq)
@@ -204,7 +204,7 @@ static void sched_rt_rq_enqueue(struct r
if (rt_rq->rt_nr_running) {
if (rt_se && !on_rt_rq(rt_se))
- enqueue_rt_entity(rt_se);
+ enqueue_rt_entity(rt_se, false);
if (rt_rq->highest_prio.curr < curr->prio)
resched_task(curr);
}
@@ -803,7 +803,7 @@ void dec_rt_tasks(struct sched_rt_entity
dec_rt_group(rt_se, rt_rq);
}
-static void __enqueue_rt_entity(struct sched_rt_entity *rt_se)
+static void __enqueue_rt_entity(struct sched_rt_entity *rt_se, bool head)
{
struct rt_rq *rt_rq = rt_rq_of_se(rt_se);
struct rt_prio_array *array = &rt_rq->active;
@@ -819,7 +819,10 @@ static void __enqueue_rt_entity(struct s
if (group_rq && (rt_rq_throttled(group_rq) || !group_rq->rt_nr_running))
return;
- list_add_tail(&rt_se->run_list, queue);
+ if (head)
+ list_add(&rt_se->run_list, queue);
+ else
+ list_add_tail(&rt_se->run_list, queue);
__set_bit(rt_se_prio(rt_se), array->bitmap);
inc_rt_tasks(rt_se, rt_rq);
@@ -856,11 +859,11 @@ static void dequeue_rt_stack(struct sche
}
}
-static void enqueue_rt_entity(struct sched_rt_entity *rt_se)
+static void enqueue_rt_entity(struct sched_rt_entity *rt_se, bool head)
{
dequeue_rt_stack(rt_se);
for_each_sched_rt_entity(rt_se)
- __enqueue_rt_entity(rt_se);
+ __enqueue_rt_entity(rt_se, head);
}
static void dequeue_rt_entity(struct sched_rt_entity *rt_se)
@@ -871,7 +874,7 @@ static void dequeue_rt_entity(struct sch
struct rt_rq *rt_rq = group_rt_rq(rt_se);
if (rt_rq && rt_rq->rt_nr_running)
- __enqueue_rt_entity(rt_se);
+ __enqueue_rt_entity(rt_se, false);
}
}
@@ -886,7 +889,7 @@ enqueue_task_rt(struct rq *rq, struct ta
if (wakeup)
rt_se->timeout = 0;
- enqueue_rt_entity(rt_se);
+ enqueue_rt_entity(rt_se, head);
if (!task_current(rq, p) && p->rt.nr_cpus_allowed > 1)
enqueue_pushable_task(rq, p);
next prev parent reply other threads:[~2010-01-20 20:59 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-01-20 20:58 [patch 0/3] sched: Make Priority Inheritance POSIX compliant Thomas Gleixner
2010-01-20 20:58 ` [patch 1/3] sched: Extend enqueue_task to allow head queueing Thomas Gleixner
2010-01-22 17:12 ` [tip:sched/core] " tip-bot for Thomas Gleixner
2010-01-20 20:59 ` Thomas Gleixner [this message]
2010-01-22 17:12 ` [tip:sched/core] sched: Implement head queueing for sched_rt tip-bot for Thomas Gleixner
2010-01-20 20:59 ` [patch 3/3] sched: Queue a deboosted task to the head of the RT priority queue Thomas Gleixner
2010-01-22 17:13 ` [tip:sched/core] sched: Queue a deboosted task to the head of the RT prio queue tip-bot for Thomas Gleixner
2010-01-20 21:06 ` [patch 0/3] sched: Make Priority Inheritance POSIX compliant Peter Zijlstra
2010-01-20 21:59 ` John Kacur
2010-01-21 0:52 ` Carsten Emde
2010-01-21 16:16 ` Weber, Mathias
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