diff options
Diffstat (limited to 'kernel/sched.c')
| -rw-r--r-- | kernel/sched.c | 25 |
1 files changed, 19 insertions, 6 deletions
diff --git a/kernel/sched.c b/kernel/sched.c index ae659b99ce7..48013633d79 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 @@ -4997,7 +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); @@ -5011,6 +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) { /* @@ -5473,6 +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. @@ -5703,7 +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)) @@ -6318,6 +6331,9 @@ migration_call(struct notifier_block *nfb, unsigned long action, void *hcpu) break; #endif } + + update_max_interval(); + return NOTIFY_OK; } @@ -8449,7 +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); @@ -8462,8 +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) |