Commit 396e9099 authored by Linus Torvalds's avatar Linus Torvalds

Merge branch 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull scheduler fixes from Ingo Molnar:
 "Misc fixes"

* 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  sched/deadline: Fix deadline parameter modification handling
  sched/wait: Remove might_sleep() from wait_event_cmd()
  sched: Fix crash if cpuset_cpumask_can_shrink() is passed an empty cpumask
  sched/fair: Avoid using uninitialized variable in preferred_group_nid()
parents 29f12c48 40767b0d
......@@ -363,7 +363,6 @@ do { \
*/
#define wait_event_cmd(wq, condition, cmd1, cmd2) \
do { \
might_sleep(); \
if (condition) \
break; \
__wait_event_cmd(wq, condition, cmd1, cmd2); \
......
......@@ -1814,6 +1814,10 @@ void __dl_clear_params(struct task_struct *p)
dl_se->dl_period = 0;
dl_se->flags = 0;
dl_se->dl_bw = 0;
dl_se->dl_throttled = 0;
dl_se->dl_new = 1;
dl_se->dl_yielded = 0;
}
/*
......@@ -1839,7 +1843,7 @@ static void __sched_fork(unsigned long clone_flags, struct task_struct *p)
#endif
RB_CLEAR_NODE(&p->dl.rb_node);
hrtimer_init(&p->dl.dl_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
init_dl_task_timer(&p->dl);
__dl_clear_params(p);
INIT_LIST_HEAD(&p->rt.run_list);
......@@ -2049,6 +2053,9 @@ static inline int dl_bw_cpus(int i)
* allocated bandwidth to reflect the new situation.
*
* This function is called while holding p's rq->lock.
*
* XXX we should delay bw change until the task's 0-lag point, see
* __setparam_dl().
*/
static int dl_overflow(struct task_struct *p, int policy,
const struct sched_attr *attr)
......@@ -3251,15 +3258,31 @@ __setparam_dl(struct task_struct *p, const struct sched_attr *attr)
{
struct sched_dl_entity *dl_se = &p->dl;
init_dl_task_timer(dl_se);
dl_se->dl_runtime = attr->sched_runtime;
dl_se->dl_deadline = attr->sched_deadline;
dl_se->dl_period = attr->sched_period ?: dl_se->dl_deadline;
dl_se->flags = attr->sched_flags;
dl_se->dl_bw = to_ratio(dl_se->dl_period, dl_se->dl_runtime);
dl_se->dl_throttled = 0;
dl_se->dl_new = 1;
dl_se->dl_yielded = 0;
/*
* Changing the parameters of a task is 'tricky' and we're not doing
* the correct thing -- also see task_dead_dl() and switched_from_dl().
*
* What we SHOULD do is delay the bandwidth release until the 0-lag
* point. This would include retaining the task_struct until that time
* and change dl_overflow() to not immediately decrement the current
* amount.
*
* Instead we retain the current runtime/deadline and let the new
* parameters take effect after the current reservation period lapses.
* This is safe (albeit pessimistic) because the 0-lag point is always
* before the current scheduling deadline.
*
* We can still have temporary overloads because we do not delay the
* change in bandwidth until that time; so admission control is
* not on the safe side. It does however guarantee tasks will never
* consume more than promised.
*/
}
/*
......@@ -4642,6 +4665,9 @@ int cpuset_cpumask_can_shrink(const struct cpumask *cur,
struct dl_bw *cur_dl_b;
unsigned long flags;
if (!cpumask_weight(cur))
return ret;
rcu_read_lock_sched();
cur_dl_b = dl_bw_of(cpumask_any(cur));
trial_cpus = cpumask_weight(trial);
......
......@@ -1094,6 +1094,7 @@ static void task_dead_dl(struct task_struct *p)
* Since we are TASK_DEAD we won't slip out of the domain!
*/
raw_spin_lock_irq(&dl_b->lock);
/* XXX we should retain the bw until 0-lag */
dl_b->total_bw -= p->dl.dl_bw;
raw_spin_unlock_irq(&dl_b->lock);
......@@ -1614,8 +1615,8 @@ static void cancel_dl_timer(struct rq *rq, struct task_struct *p)
static void switched_from_dl(struct rq *rq, struct task_struct *p)
{
/* XXX we should retain the bw until 0-lag */
cancel_dl_timer(rq, p);
__dl_clear_params(p);
/*
......
......@@ -1730,7 +1730,7 @@ static int preferred_group_nid(struct task_struct *p, int nid)
nodes = node_online_map;
for (dist = sched_max_numa_distance; dist > LOCAL_DISTANCE; dist--) {
unsigned long max_faults = 0;
nodemask_t max_group;
nodemask_t max_group = NODE_MASK_NONE;
int a, b;
/* Are there nodes at this distance from each other? */
......
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