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Diffstat (limited to 'kernel/sched.c')
-rw-r--r--kernel/sched.c46
1 files changed, 37 insertions, 9 deletions
diff --git a/kernel/sched.c b/kernel/sched.c
index a172494a9a63..312f8b95c2d4 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -2309,7 +2309,7 @@ unsigned long wait_task_inactive(struct task_struct *p, long match_state)
* Cause a process which is running on another CPU to enter
* kernel-mode, without any delay. (to get signals handled.)
*
- * NOTE: this function doesnt have to take the runqueue lock,
+ * NOTE: this function doesn't have to take the runqueue lock,
* because all it wants to ensure is that the remote task enters
* the kernel. If the IPI races and the task has been migrated
* to another CPU then no harm is done and the purpose has been
@@ -4111,6 +4111,16 @@ need_resched:
try_to_wake_up_local(to_wakeup);
}
deactivate_task(rq, prev, DEQUEUE_SLEEP);
+
+ /*
+ * If we are going to sleep and we have plugged IO queued, make
+ * sure to submit it to avoid deadlocks.
+ */
+ if (blk_needs_flush_plug(prev)) {
+ raw_spin_unlock(&rq->lock);
+ blk_schedule_flush_plug(prev);
+ raw_spin_lock(&rq->lock);
+ }
}
switch_count = &prev->nvcsw;
}
@@ -4892,8 +4902,11 @@ static bool check_same_owner(struct task_struct *p)
rcu_read_lock();
pcred = __task_cred(p);
- match = (cred->euid == pcred->euid ||
- cred->euid == pcred->uid);
+ if (cred->user->user_ns == pcred->user->user_ns)
+ match = (cred->euid == pcred->euid ||
+ cred->euid == pcred->uid);
+ else
+ match = false;
rcu_read_unlock();
return match;
}
@@ -4984,7 +4997,7 @@ recheck:
*/
raw_spin_lock_irqsave(&p->pi_lock, flags);
/*
- * To be able to change p->policy safely, the apropriate
+ * To be able to change p->policy safely, the appropriate
* runqueue lock must be held.
*/
rq = __task_rq_lock(p);
@@ -4998,6 +5011,17 @@ recheck:
return -EINVAL;
}
+ /*
+ * If not changing anything there's no need to proceed further:
+ */
+ if (unlikely(policy == p->policy && (!rt_policy(policy) ||
+ param->sched_priority == p->rt_priority))) {
+
+ __task_rq_unlock(rq);
+ raw_spin_unlock_irqrestore(&p->pi_lock, flags);
+ return 0;
+ }
+
#ifdef CONFIG_RT_GROUP_SCHED
if (user) {
/*
@@ -5221,7 +5245,7 @@ long sched_setaffinity(pid_t pid, const struct cpumask *in_mask)
goto out_free_cpus_allowed;
}
retval = -EPERM;
- if (!check_same_owner(p) && !capable(CAP_SYS_NICE))
+ if (!check_same_owner(p) && !task_ns_capable(p, CAP_SYS_NICE))
goto out_unlock;
retval = security_task_setscheduler(p);
@@ -5460,6 +5484,8 @@ EXPORT_SYMBOL(yield);
* yield_to - yield the current processor to another thread in
* your thread group, or accelerate that thread toward the
* processor it's on.
+ * @p: target task
+ * @preempt: whether task preemption is allowed or not
*
* It's the caller's job to ensure that the target task struct
* can't go away on us before we can do any checks.
@@ -5525,6 +5551,7 @@ void __sched io_schedule(void)
delayacct_blkio_start();
atomic_inc(&rq->nr_iowait);
+ blk_flush_plug(current);
current->in_iowait = 1;
schedule();
current->in_iowait = 0;
@@ -5540,6 +5567,7 @@ long __sched io_schedule_timeout(long timeout)
delayacct_blkio_start();
atomic_inc(&rq->nr_iowait);
+ blk_flush_plug(current);
current->in_iowait = 1;
ret = schedule_timeout(timeout);
current->in_iowait = 0;
@@ -5688,7 +5716,7 @@ void show_state_filter(unsigned long state_filter)
do_each_thread(g, p) {
/*
* reset the NMI-timeout, listing all files on a slow
- * console might take alot of time:
+ * console might take a lot of time:
*/
touch_nmi_watchdog();
if (!state_filter || (p->state & state_filter))
@@ -6303,6 +6331,9 @@ migration_call(struct notifier_block *nfb, unsigned long action, void *hcpu)
break;
#endif
}
+
+ update_max_interval();
+
return NOTIFY_OK;
}
@@ -8434,7 +8465,6 @@ int alloc_fair_sched_group(struct task_group *tg, struct task_group *parent)
{
struct cfs_rq *cfs_rq;
struct sched_entity *se;
- struct rq *rq;
int i;
tg->cfs_rq = kzalloc(sizeof(cfs_rq) * nr_cpu_ids, GFP_KERNEL);
@@ -8447,8 +8477,6 @@ int alloc_fair_sched_group(struct task_group *tg, struct task_group *parent)
tg->shares = NICE_0_LOAD;
for_each_possible_cpu(i) {
- rq = cpu_rq(i);
-
cfs_rq = kzalloc_node(sizeof(struct cfs_rq),
GFP_KERNEL, cpu_to_node(i));
if (!cfs_rq)