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author | Peter Zijlstra <peterz@infradead.org> | 2015-06-11 14:46:43 +0200 |
---|---|---|
committer | Thomas Gleixner <tglx@linutronix.de> | 2015-06-19 00:25:26 +0200 |
commit | 9916e214998a4a363b152b637245e5c958067350 (patch) | |
tree | 5df0a1cdf0695951c654f7cdbb5443b1dc0560da /kernel | |
parent | 0ea60c2054fc3b0c3eb68ac4f6884f3ee78d9925 (diff) | |
download | linux-9916e214998a4a363b152b637245e5c958067350.tar.gz linux-9916e214998a4a363b152b637245e5c958067350.tar.bz2 linux-9916e214998a4a363b152b637245e5c958067350.zip |
sched, dl: Convert switched_{from, to}_dl() / prio_changed_dl() to balance callbacks
Remove the direct {push,pull} balancing operations from
switched_{from,to}_dl() / prio_changed_dl() and use the balance
callback queue.
Again, err on the side of too many reschedules; since too few is a
hard bug while too many is just annoying.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: ktkhai@parallels.com
Cc: rostedt@goodmis.org
Cc: juri.lelli@gmail.com
Cc: pang.xunlei@linaro.org
Cc: oleg@redhat.com
Cc: wanpeng.li@linux.intel.com
Cc: umgwanakikbuti@gmail.com
Link: http://lkml.kernel.org/r/20150611124742.968262663@infradead.org
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'kernel')
-rw-r--r-- | kernel/sched/deadline.c | 45 |
1 files changed, 24 insertions, 21 deletions
diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c index 079c09251e90..69d9f509a582 100644 --- a/kernel/sched/deadline.c +++ b/kernel/sched/deadline.c @@ -213,16 +213,23 @@ static inline bool need_pull_dl_task(struct rq *rq, struct task_struct *prev) return dl_task(prev); } -static DEFINE_PER_CPU(struct callback_head, dl_balance_head); +static DEFINE_PER_CPU(struct callback_head, dl_push_head); +static DEFINE_PER_CPU(struct callback_head, dl_pull_head); static void push_dl_tasks(struct rq *); +static void pull_dl_task(struct rq *); static inline void queue_push_tasks(struct rq *rq) { if (!has_pushable_dl_tasks(rq)) return; - queue_balance_callback(rq, &per_cpu(dl_balance_head, rq->cpu), push_dl_tasks); + queue_balance_callback(rq, &per_cpu(dl_push_head, rq->cpu), push_dl_tasks); +} + +static inline void queue_pull_task(struct rq *rq) +{ + queue_balance_callback(rq, &per_cpu(dl_pull_head, rq->cpu), pull_dl_task); } static struct rq *find_lock_later_rq(struct task_struct *task, struct rq *rq); @@ -305,6 +312,10 @@ static inline void pull_dl_task(struct rq *rq) static inline void queue_push_tasks(struct rq *rq) { } + +static inline void queue_pull_task(struct rq *rq) +{ +} #endif /* CONFIG_SMP */ static void enqueue_task_dl(struct rq *rq, struct task_struct *p, int flags); @@ -1040,8 +1051,6 @@ static void check_preempt_equal_dl(struct rq *rq, struct task_struct *p) resched_curr(rq); } -static void pull_dl_task(struct rq *this_rq); - #endif /* CONFIG_SMP */ /* @@ -1705,7 +1714,7 @@ static void switched_from_dl(struct rq *rq, struct task_struct *p) if (!task_on_rq_queued(p) || rq->dl.dl_nr_running) return; - pull_dl_task(rq); + queue_pull_task(rq); } /* @@ -1714,21 +1723,16 @@ static void switched_from_dl(struct rq *rq, struct task_struct *p) */ static void switched_to_dl(struct rq *rq, struct task_struct *p) { - int check_resched = 1; - if (task_on_rq_queued(p) && rq->curr != p) { #ifdef CONFIG_SMP - if (p->nr_cpus_allowed > 1 && rq->dl.overloaded && - push_dl_task(rq) && rq != task_rq(p)) - /* Only reschedule if pushing failed */ - check_resched = 0; -#endif /* CONFIG_SMP */ - if (check_resched) { - if (dl_task(rq->curr)) - check_preempt_curr_dl(rq, p, 0); - else - resched_curr(rq); - } + if (p->nr_cpus_allowed > 1 && rq->dl.overloaded) + queue_push_tasks(rq); +#else + if (dl_task(rq->curr)) + check_preempt_curr_dl(rq, p, 0); + else + resched_curr(rq); +#endif } } @@ -1748,15 +1752,14 @@ static void prio_changed_dl(struct rq *rq, struct task_struct *p, * or lowering its prio, so... */ if (!rq->dl.overloaded) - pull_dl_task(rq); + queue_pull_task(rq); /* * If we now have a earlier deadline task than p, * then reschedule, provided p is still on this * runqueue. */ - if (dl_time_before(rq->dl.earliest_dl.curr, p->dl.deadline) && - rq->curr == p) + if (dl_time_before(rq->dl.earliest_dl.curr, p->dl.deadline)) resched_curr(rq); #else /* |