diff options
author | Tommaso Cucinotta <tommaso.cucinotta@sssup.it> | 2016-08-14 16:27:08 +0200 |
---|---|---|
committer | Ingo Molnar <mingo@kernel.org> | 2016-09-05 13:29:43 +0200 |
commit | d8206bb3ffe0eaee03abfad46fd44d8b17142e88 (patch) | |
tree | 8002a43ab30ac2e28d8662ce4f6f9ae6cc61fcb5 /kernel | |
parent | 8e1bc301aaf9f9a2d731bf8d50d549ac2dcfdab2 (diff) | |
download | op-kernel-dev-d8206bb3ffe0eaee03abfad46fd44d8b17142e88.zip op-kernel-dev-d8206bb3ffe0eaee03abfad46fd44d8b17142e88.tar.gz |
sched/deadline: Split cpudl_set() into cpudl_set() and cpudl_clear()
These 2 exercise independent code paths and need different arguments.
After this change, you call:
cpudl_clear(cp, cpu);
cpudl_set(cp, cpu, dl);
instead of:
cpudl_set(cp, cpu, 0 /* dl */, 0 /* is_valid */);
cpudl_set(cp, cpu, dl, 1 /* is_valid */);
Signed-off-by: Tommaso Cucinotta <tommaso.cucinotta@sssup.it>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Luca Abeni <luca.abeni@unitn.it>
Reviewed-by: Juri Lelli <juri.lelli@arm.com>
Cc: Juri Lelli <juri.lelli@gmail.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-dl@retis.sssup.it
Link: http://lkml.kernel.org/r/1471184828-12644-4-git-send-email-tommaso.cucinotta@sssup.it
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel')
-rw-r--r-- | kernel/sched/cpudeadline.c | 49 | ||||
-rw-r--r-- | kernel/sched/cpudeadline.h | 3 | ||||
-rw-r--r-- | kernel/sched/deadline.c | 10 |
3 files changed, 40 insertions, 22 deletions
diff --git a/kernel/sched/cpudeadline.c b/kernel/sched/cpudeadline.c index 0ace75a..e731190 100644 --- a/kernel/sched/cpudeadline.c +++ b/kernel/sched/cpudeadline.c @@ -145,16 +145,15 @@ out: } /* - * cpudl_set - update the cpudl max-heap + * cpudl_clear - remove a cpu from the cpudl max-heap * @cp: the cpudl max-heap context * @cpu: the target cpu - * @dl: the new earliest deadline for this cpu * * Notes: assumes cpu_rq(cpu)->lock is locked * * Returns: (void) */ -void cpudl_set(struct cpudl *cp, int cpu, u64 dl, int is_valid) +void cpudl_clear(struct cpudl *cp, int cpu) { int old_idx, new_cpu; unsigned long flags; @@ -162,17 +161,15 @@ void cpudl_set(struct cpudl *cp, int cpu, u64 dl, int is_valid) WARN_ON(!cpu_present(cpu)); raw_spin_lock_irqsave(&cp->lock, flags); + old_idx = cp->elements[cpu].idx; - if (!is_valid) { - /* remove item */ - if (old_idx == IDX_INVALID) { - /* - * Nothing to remove if old_idx was invalid. - * This could happen if a rq_offline_dl is - * called for a CPU without -dl tasks running. - */ - goto out; - } + if (old_idx == IDX_INVALID) { + /* + * Nothing to remove if old_idx was invalid. + * This could happen if a rq_offline_dl is + * called for a CPU without -dl tasks running. + */ + } else { new_cpu = cp->elements[cp->size - 1].cpu; cp->elements[old_idx].dl = cp->elements[cp->size - 1].dl; cp->elements[old_idx].cpu = new_cpu; @@ -180,11 +177,32 @@ void cpudl_set(struct cpudl *cp, int cpu, u64 dl, int is_valid) cp->elements[new_cpu].idx = old_idx; cp->elements[cpu].idx = IDX_INVALID; cpudl_heapify(cp, old_idx); - cpumask_set_cpu(cpu, cp->free_cpus); - goto out; + cpumask_set_cpu(cpu, cp->free_cpus); } + raw_spin_unlock_irqrestore(&cp->lock, flags); +} + +/* + * cpudl_set - update the cpudl max-heap + * @cp: the cpudl max-heap context + * @cpu: the target cpu + * @dl: the new earliest deadline for this cpu + * + * Notes: assumes cpu_rq(cpu)->lock is locked + * + * Returns: (void) + */ +void cpudl_set(struct cpudl *cp, int cpu, u64 dl) +{ + int old_idx; + unsigned long flags; + + WARN_ON(!cpu_present(cpu)); + raw_spin_lock_irqsave(&cp->lock, flags); + + old_idx = cp->elements[cpu].idx; if (old_idx == IDX_INVALID) { int new_idx = cp->size++; cp->elements[new_idx].dl = dl; @@ -197,7 +215,6 @@ void cpudl_set(struct cpudl *cp, int cpu, u64 dl, int is_valid) cpudl_heapify(cp, old_idx); } -out: raw_spin_unlock_irqrestore(&cp->lock, flags); } diff --git a/kernel/sched/cpudeadline.h b/kernel/sched/cpudeadline.h index fcbdf83..f7da8c5 100644 --- a/kernel/sched/cpudeadline.h +++ b/kernel/sched/cpudeadline.h @@ -23,7 +23,8 @@ struct cpudl { #ifdef CONFIG_SMP int cpudl_find(struct cpudl *cp, struct task_struct *p, struct cpumask *later_mask); -void cpudl_set(struct cpudl *cp, int cpu, u64 dl, int is_valid); +void cpudl_set(struct cpudl *cp, int cpu, u64 dl); +void cpudl_clear(struct cpudl *cp, int cpu); int cpudl_init(struct cpudl *cp); void cpudl_set_freecpu(struct cpudl *cp, int cpu); void cpudl_clear_freecpu(struct cpudl *cp, int cpu); diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c index d091f4a..18fb0b8 100644 --- a/kernel/sched/deadline.c +++ b/kernel/sched/deadline.c @@ -798,7 +798,7 @@ static void inc_dl_deadline(struct dl_rq *dl_rq, u64 deadline) if (dl_rq->earliest_dl.curr == 0 || dl_time_before(deadline, dl_rq->earliest_dl.curr)) { dl_rq->earliest_dl.curr = deadline; - cpudl_set(&rq->rd->cpudl, rq->cpu, deadline, 1); + cpudl_set(&rq->rd->cpudl, rq->cpu, deadline); } } @@ -813,14 +813,14 @@ static void dec_dl_deadline(struct dl_rq *dl_rq, u64 deadline) if (!dl_rq->dl_nr_running) { dl_rq->earliest_dl.curr = 0; dl_rq->earliest_dl.next = 0; - cpudl_set(&rq->rd->cpudl, rq->cpu, 0, 0); + cpudl_clear(&rq->rd->cpudl, rq->cpu); } else { struct rb_node *leftmost = dl_rq->rb_leftmost; struct sched_dl_entity *entry; entry = rb_entry(leftmost, struct sched_dl_entity, rb_node); dl_rq->earliest_dl.curr = entry->deadline; - cpudl_set(&rq->rd->cpudl, rq->cpu, entry->deadline, 1); + cpudl_set(&rq->rd->cpudl, rq->cpu, entry->deadline); } } @@ -1671,7 +1671,7 @@ static void rq_online_dl(struct rq *rq) cpudl_set_freecpu(&rq->rd->cpudl, rq->cpu); if (rq->dl.dl_nr_running > 0) - cpudl_set(&rq->rd->cpudl, rq->cpu, rq->dl.earliest_dl.curr, 1); + cpudl_set(&rq->rd->cpudl, rq->cpu, rq->dl.earliest_dl.curr); } /* Assumes rq->lock is held */ @@ -1680,7 +1680,7 @@ static void rq_offline_dl(struct rq *rq) if (rq->dl.overloaded) dl_clear_overload(rq); - cpudl_set(&rq->rd->cpudl, rq->cpu, 0, 0); + cpudl_clear(&rq->rd->cpudl, rq->cpu); cpudl_clear_freecpu(&rq->rd->cpudl, rq->cpu); } |