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Date: Sat, 28 May 2011 16:35:56 GMT
From: tip-bot for KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To: linux-tip-commits@...r.kernel.org
Cc: linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
a.p.zijlstra@...llo.nl, oleg@...hat.com, tglx@...utronix.de,
kosaki.motohiro@...fujitsu.com, mingo@...e.hu
Subject: [tip:sched/urgent] cpuset: Fix cpuset_cpus_allowed_fallback(), don't update tsk->rt.nr_cpus_allowed
Commit-ID: 1e1b6c511d1b23cb7c3b619d82fc7bd9f620565d
Gitweb: http://git.kernel.org/tip/1e1b6c511d1b23cb7c3b619d82fc7bd9f620565d
Author: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
AuthorDate: Thu, 19 May 2011 15:08:58 +0900
Committer: Ingo Molnar <mingo@...e.hu>
CommitDate: Sat, 28 May 2011 17:02:57 +0200
cpuset: Fix cpuset_cpus_allowed_fallback(), don't update tsk->rt.nr_cpus_allowed
The rule is, we have to update tsk->rt.nr_cpus_allowed if we change
tsk->cpus_allowed. Otherwise RT scheduler may confuse.
Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc: Oleg Nesterov <oleg@...hat.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Link: http://lkml.kernel.org/r/4DD4B3FA.5060901@jp.fujitsu.com
Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
include/linux/cpuset.h | 2 +-
include/linux/sched.h | 7 +++++++
kernel/cpuset.c | 4 ++--
kernel/kthread.c | 4 ++--
kernel/sched.c | 19 ++++++++++++-------
5 files changed, 24 insertions(+), 12 deletions(-)
diff --git a/include/linux/cpuset.h b/include/linux/cpuset.h
index f20eb8f..e9eaec5 100644
--- a/include/linux/cpuset.h
+++ b/include/linux/cpuset.h
@@ -146,7 +146,7 @@ static inline void cpuset_cpus_allowed(struct task_struct *p,
static inline int cpuset_cpus_allowed_fallback(struct task_struct *p)
{
- cpumask_copy(&p->cpus_allowed, cpu_possible_mask);
+ do_set_cpus_allowed(p, cpu_possible_mask);
return cpumask_any(cpu_active_mask);
}
diff --git a/include/linux/sched.h b/include/linux/sched.h
index dc88712..8da84b7 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1841,9 +1841,16 @@ static inline void rcu_copy_process(struct task_struct *p)
#endif
#ifdef CONFIG_SMP
+extern void do_set_cpus_allowed(struct task_struct *p,
+ const struct cpumask *new_mask);
+
extern int set_cpus_allowed_ptr(struct task_struct *p,
const struct cpumask *new_mask);
#else
+static inline void do_set_cpus_allowed(struct task_struct *p,
+ const struct cpumask *new_mask)
+{
+}
static inline int set_cpus_allowed_ptr(struct task_struct *p,
const struct cpumask *new_mask)
{
diff --git a/kernel/cpuset.c b/kernel/cpuset.c
index 1ceeb04..9c9b754 100644
--- a/kernel/cpuset.c
+++ b/kernel/cpuset.c
@@ -2190,7 +2190,7 @@ int cpuset_cpus_allowed_fallback(struct task_struct *tsk)
rcu_read_lock();
cs = task_cs(tsk);
if (cs)
- cpumask_copy(&tsk->cpus_allowed, cs->cpus_allowed);
+ do_set_cpus_allowed(tsk, cs->cpus_allowed);
rcu_read_unlock();
/*
@@ -2217,7 +2217,7 @@ int cpuset_cpus_allowed_fallback(struct task_struct *tsk)
* Like above we can temporary set any mask and rely on
* set_cpus_allowed_ptr() as synchronization point.
*/
- cpumask_copy(&tsk->cpus_allowed, cpu_possible_mask);
+ do_set_cpus_allowed(tsk, cpu_possible_mask);
cpu = cpumask_any(cpu_active_mask);
}
diff --git a/kernel/kthread.c b/kernel/kthread.c
index 3b34d27..4ba7ccc 100644
--- a/kernel/kthread.c
+++ b/kernel/kthread.c
@@ -202,8 +202,8 @@ void kthread_bind(struct task_struct *p, unsigned int cpu)
return;
}
- p->cpus_allowed = cpumask_of_cpu(cpu);
- p->rt.nr_cpus_allowed = 1;
+ /* It's safe because the task is inactive. */
+ do_set_cpus_allowed(p, cpumask_of(cpu));
p->flags |= PF_THREAD_BOUND;
}
EXPORT_SYMBOL(kthread_bind);
diff --git a/kernel/sched.c b/kernel/sched.c
index a80ee91..cbb3a0e 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -5860,7 +5860,7 @@ void __cpuinit init_idle(struct task_struct *idle, int cpu)
idle->state = TASK_RUNNING;
idle->se.exec_start = sched_clock();
- cpumask_copy(&idle->cpus_allowed, cpumask_of(cpu));
+ do_set_cpus_allowed(idle, cpumask_of(cpu));
/*
* We're having a chicken and egg problem, even though we are
* holding rq->lock, the cpu isn't yet set to this cpu so the
@@ -5948,6 +5948,16 @@ static inline void sched_init_granularity(void)
}
#ifdef CONFIG_SMP
+void do_set_cpus_allowed(struct task_struct *p, const struct cpumask *new_mask)
+{
+ if (p->sched_class && p->sched_class->set_cpus_allowed)
+ p->sched_class->set_cpus_allowed(p, new_mask);
+ else {
+ cpumask_copy(&p->cpus_allowed, new_mask);
+ p->rt.nr_cpus_allowed = cpumask_weight(new_mask);
+ }
+}
+
/*
* This is how migration works:
*
@@ -5993,12 +6003,7 @@ int set_cpus_allowed_ptr(struct task_struct *p, const struct cpumask *new_mask)
goto out;
}
- if (p->sched_class->set_cpus_allowed)
- p->sched_class->set_cpus_allowed(p, new_mask);
- else {
- cpumask_copy(&p->cpus_allowed, new_mask);
- p->rt.nr_cpus_allowed = cpumask_weight(new_mask);
- }
+ do_set_cpus_allowed(p, new_mask);
/* Can the task run on the task's current CPU? If so, we're done */
if (cpumask_test_cpu(task_cpu(p), new_mask))
--
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