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sched/rt: Substract number of tasks of throttled queues from rq->nr_running

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Now rq->rt becomes to be able to be in dequeued or enqueued state.
We add new member rt_rq->rt_queued, which is used to indicate this.
The member is used only for top queue rq->rt_rq.

The goal is to fit generic scheme which is used in deadline and
fair classes, i.e. throttled rt_rq's rt_nr_running is beeing
substracted from rq->nr_running.

Signed-off-by: Kirill Tkhai <tkhai@yandex.ru>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1394835300.18748.33.camel@HP-250-G1-Notebook-PC
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Kirill Tkhai 2014-03-15 02:15:00 +04:00 committed by Ingo Molnar
parent 653d07a698
commit f4ebcbc0d7
2 changed files with 63 additions and 12 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

73
kernel/sched/rt.c
View file

@ -79,6 +79,8 @@ void init_rt_rq(struct rt_rq *rt_rq, struct rq *rq)
rt_rq->overloaded = 0;
plist_head_init(&rt_rq->pushable_tasks);
#endif
/* We start is dequeued state, because no RT tasks are queued */
rt_rq->rt_queued = 0;
rt_rq->rt_time = 0;
rt_rq->rt_throttled = 0;
@ -404,6 +406,9 @@ static inline void set_post_schedule(struct rq *rq)
}
#endif /* CONFIG_SMP */
static void enqueue_top_rt_rq(struct rt_rq *rt_rq);
static void dequeue_top_rt_rq(struct rt_rq *rt_rq);
static inline int on_rt_rq(struct sched_rt_entity *rt_se)
{
return !list_empty(&rt_se->run_list);
@ -465,8 +470,11 @@ static void sched_rt_rq_enqueue(struct rt_rq *rt_rq)
rt_se = rt_rq->tg->rt_se[cpu];
if (rt_rq->rt_nr_running) {
if (rt_se && !on_rt_rq(rt_se))
if (!rt_se)
enqueue_top_rt_rq(rt_rq);
else if (!on_rt_rq(rt_se))
enqueue_rt_entity(rt_se, false);
if (rt_rq->highest_prio.curr < curr->prio)
resched_task(curr);
}
@ -479,7 +487,9 @@ static void sched_rt_rq_dequeue(struct rt_rq *rt_rq)
rt_se = rt_rq->tg->rt_se[cpu];
if (rt_se && on_rt_rq(rt_se))
if (!rt_se)
dequeue_top_rt_rq(rt_rq);
else if (on_rt_rq(rt_se))
dequeue_rt_entity(rt_se);
}
@ -545,12 +555,18 @@ static inline struct rt_rq *group_rt_rq(struct sched_rt_entity *rt_se)
static inline void sched_rt_rq_enqueue(struct rt_rq *rt_rq)
{
if (rt_rq->rt_nr_running)
resched_task(rq_of_rt_rq(rt_rq)->curr);
struct rq *rq = rq_of_rt_rq(rt_rq);
if (!rt_rq->rt_nr_running)
return;
enqueue_top_rt_rq(rt_rq);
resched_task(rq->curr);
}
static inline void sched_rt_rq_dequeue(struct rt_rq *rt_rq)
{
dequeue_top_rt_rq(rt_rq);
}
static inline const struct cpumask *sched_rt_period_mask(void)
@ -935,6 +951,38 @@ static void update_curr_rt(struct rq *rq)
}
}
static void
dequeue_top_rt_rq(struct rt_rq *rt_rq)
{
struct rq *rq = rq_of_rt_rq(rt_rq);
BUG_ON(&rq->rt != rt_rq);
if (!rt_rq->rt_queued)
return;
BUG_ON(!rq->nr_running);
rq->nr_running -= rt_rq->rt_nr_running;
rt_rq->rt_queued = 0;
}
static void
enqueue_top_rt_rq(struct rt_rq *rt_rq)
{
struct rq *rq = rq_of_rt_rq(rt_rq);
BUG_ON(&rq->rt != rt_rq);
if (rt_rq->rt_queued)
return;
if (rt_rq_throttled(rt_rq) || !rt_rq->rt_nr_running)
return;
rq->nr_running += rt_rq->rt_nr_running;
rt_rq->rt_queued = 1;
}
#if defined CONFIG_SMP
static void
@ -1143,6 +1191,8 @@ static void dequeue_rt_stack(struct sched_rt_entity *rt_se)
back = rt_se;
}
dequeue_top_rt_rq(rt_rq_of_se(back));
for (rt_se = back; rt_se; rt_se = rt_se->back) {
if (on_rt_rq(rt_se))
__dequeue_rt_entity(rt_se);
@ -1151,13 +1201,18 @@ static void dequeue_rt_stack(struct sched_rt_entity *rt_se)
static void enqueue_rt_entity(struct sched_rt_entity *rt_se, bool head)
{
struct rq *rq = rq_of_rt_se(rt_se);
dequeue_rt_stack(rt_se);
for_each_sched_rt_entity(rt_se)
__enqueue_rt_entity(rt_se, head);
enqueue_top_rt_rq(&rq->rt);
}
static void dequeue_rt_entity(struct sched_rt_entity *rt_se)
{
struct rq *rq = rq_of_rt_se(rt_se);
dequeue_rt_stack(rt_se);
for_each_sched_rt_entity(rt_se) {
@ -1166,6 +1221,7 @@ static void dequeue_rt_entity(struct sched_rt_entity *rt_se)
if (rt_rq && rt_rq->rt_nr_running)
__enqueue_rt_entity(rt_se, false);
}
enqueue_top_rt_rq(&rq->rt);
}
/*
@ -1183,8 +1239,6 @@ enqueue_task_rt(struct rq *rq, struct task_struct *p, int flags)
if (!task_current(rq, p) && p->nr_cpus_allowed > 1)
enqueue_pushable_task(rq, p);
inc_nr_running(rq);
}
static void dequeue_task_rt(struct rq *rq, struct task_struct *p, int flags)
@ -1195,8 +1249,6 @@ static void dequeue_task_rt(struct rq *rq, struct task_struct *p, int flags)
dequeue_rt_entity(rt_se);
dequeue_pushable_task(rq, p);
dec_nr_running(rq);
}
/*
@ -1401,10 +1453,7 @@ pick_next_task_rt(struct rq *rq, struct task_struct *prev)
if (prev->sched_class == &rt_sched_class)
update_curr_rt(rq);
if (!rt_rq->rt_nr_running)
return NULL;
if (rt_rq_throttled(rt_rq))
if (!rt_rq->rt_queued)
return NULL;
put_prev_task(rq, prev);

2
kernel/sched/sched.h
View file

@ -409,6 +409,8 @@ struct rt_rq {
int overloaded;
struct plist_head pushable_tasks;
#endif
int rt_queued;
int rt_throttled;
u64 rt_time;
u64 rt_runtime;