linux-kernel - [tip:sched/core] sched/rt: Do not submit new work when PI-blocked

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Date:	Thu, 1 Mar 2012 04:21:31 -0800
From:	tip-bot for Thomas Gleixner <tglx@...utronix.de>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
	a.p.zijlstra@...llo.nl, tglx@...utronix.de, mingo@...e.hu
Subject: [tip:sched/core] sched/rt: Do not submit new work when PI-blocked

Commit-ID:  3c7d51843b03a6839e9ec7cda724e54d2319a63a
Gitweb:     http://git.kernel.org/tip/3c7d51843b03a6839e9ec7cda724e54d2319a63a
Author:     Thomas Gleixner <tglx@...utronix.de>
AuthorDate: Sun, 17 Jul 2011 20:46:52 +0200
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Thu, 1 Mar 2012 10:46:54 +0100

sched/rt: Do not submit new work when PI-blocked

When we are PI-blocked then we want to get things done ASAP.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Acked-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Link: http://lkml.kernel.org/n/tip-vw8et3445km5b8mpihf4trae@git.kernel.org
Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 include/linux/sched.h |    8 ++++++++
 kernel/sched/core.c   |    2 +-
 2 files changed, 9 insertions(+), 1 deletions(-)

diff --git a/include/linux/sched.h b/include/linux/sched.h
index 03dd224..c628a91 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -2082,12 +2082,20 @@ extern unsigned int sysctl_sched_cfs_bandwidth_slice;
 extern int rt_mutex_getprio(struct task_struct *p);
 extern void rt_mutex_setprio(struct task_struct *p, int prio);
 extern void rt_mutex_adjust_pi(struct task_struct *p);
+static inline bool tsk_is_pi_blocked(struct task_struct *tsk)
+{
+	return tsk->pi_blocked_on != NULL;
+}
 #else
 static inline int rt_mutex_getprio(struct task_struct *p)
 {
 	return p->normal_prio;
 }
 # define rt_mutex_adjust_pi(p)		do { } while (0)
+static inline bool tsk_is_pi_blocked(struct task_struct *tsk)
+{
+	return false;
+}
 #endif
 
 extern bool yield_to(struct task_struct *p, bool preempt);
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index c2bbdec..25e06a5 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -3227,7 +3227,7 @@ need_resched:
 
 static inline void sched_submit_work(struct task_struct *tsk)
 {
-	if (!tsk->state)
+	if (!tsk->state || tsk_is_pi_blocked(tsk))
 		return;
 	/*
 	 * If we are going to sleep and we have plugged IO queued,
--
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