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sched/deadline: Refactor CPU heap code

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1. heapify up factored out in new dedicated function heapify_up()
    (avoids repetition of same code)

 2. call to cpudl_change_key() replaced with heapify_up() when
    cpudl_set actually inserts a new node in the heap

 3. cpudl_change_key() replaced with heapify() that heapifies up
    or down as needed.

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/1471184828-12644-2-git-send-email-tommaso.cucinotta@sssup.it
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Tommaso Cucinotta 2016-08-14 16:27:06 +02:00 committed by Ingo Molnar
parent 97a7142f15
commit 126b3b6842
1 changed files with 23 additions and 27 deletions
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50
kernel/sched/cpudeadline.c
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@ -41,7 +41,7 @@ static void cpudl_exchange(struct cpudl *cp, int a, int b)
swap(cp->elements[cpu_a].idx, cp->elements[cpu_b].idx); swap(cp->elements[cpu_a].idx, cp->elements[cpu_b].idx);
} }
static void cpudl_heapify(struct cpudl *cp, int idx) static void cpudl_heapify_down(struct cpudl *cp, int idx)
{ {
int l, r, largest; int l, r, largest;
@ -66,23 +66,24 @@ static void cpudl_heapify(struct cpudl *cp, int idx)
} }
} }
static void cpudl_change_key(struct cpudl *cp, int idx, u64 new_dl) static void cpudl_heapify_up(struct cpudl *cp, int idx)
{ {
WARN_ON(idx == IDX_INVALID || !cpu_present(idx)); while (idx > 0 && dl_time_before(cp->elements[parent(idx)].dl,
cp->elements[idx].dl)) {
if (dl_time_before(new_dl, cp->elements[idx].dl)) { cpudl_exchange(cp, idx, parent(idx));
cp->elements[idx].dl = new_dl; idx = parent(idx);
cpudl_heapify(cp, idx);
} else {
cp->elements[idx].dl = new_dl;
while (idx > 0 && dl_time_before(cp->elements[parent(idx)].dl,
cp->elements[idx].dl)) {
cpudl_exchange(cp, idx, parent(idx));
idx = parent(idx);
}
} }
} }
static void cpudl_heapify(struct cpudl *cp, int idx)
{
if (idx > 0 && dl_time_before(cp->elements[parent(idx)].dl,
cp->elements[idx].dl))
cpudl_heapify_up(cp, idx);
else
cpudl_heapify_down(cp, idx);
}
static inline int cpudl_maximum(struct cpudl *cp) static inline int cpudl_maximum(struct cpudl *cp)
{ {
return cp->elements[0].cpu; return cp->elements[0].cpu;
@ -154,27 +155,22 @@ void cpudl_set(struct cpudl *cp, int cpu, u64 dl, int is_valid)
cp->size--; cp->size--;
cp->elements[new_cpu].idx = old_idx; cp->elements[new_cpu].idx = old_idx;
cp->elements[cpu].idx = IDX_INVALID; cp->elements[cpu].idx = IDX_INVALID;
while (old_idx > 0 && dl_time_before( cpudl_heapify(cp, old_idx);
cp->elements[parent(old_idx)].dl,
cp->elements[old_idx].dl)) {
cpudl_exchange(cp, old_idx, parent(old_idx));
old_idx = parent(old_idx);
}
cpumask_set_cpu(cpu, cp->free_cpus); cpumask_set_cpu(cpu, cp->free_cpus);
cpudl_heapify(cp, old_idx);
goto out; goto out;
} }
if (old_idx == IDX_INVALID) { if (old_idx == IDX_INVALID) {
cp->size++; int new_idx = cp->size++;
cp->elements[cp->size - 1].dl = dl; cp->elements[new_idx].dl = dl;
cp->elements[cp->size - 1].cpu = cpu; cp->elements[new_idx].cpu = cpu;
cp->elements[cpu].idx = cp->size - 1; cp->elements[cpu].idx = new_idx;
cpudl_change_key(cp, cp->size - 1, dl); cpudl_heapify_up(cp, new_idx);
cpumask_clear_cpu(cpu, cp->free_cpus); cpumask_clear_cpu(cpu, cp->free_cpus);
} else { } else {
cpudl_change_key(cp, old_idx, dl); cp->elements[old_idx].dl = dl;
cpudl_heapify(cp, old_idx);
} }
out: out: