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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 <[email protected]>
Signed-off-by: Peter Zijlstra (Intel) <[email protected]>
Reviewed-by: Luca Abeni <[email protected]>
Reviewed-by: Juri Lelli <[email protected]>
Cc: Juri Lelli <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: [email protected]
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>
This commit is contained in:
Tommaso Cucinotta 2016-08-14 16:27:06 +02:00 • committed by Ingo Molnar
commit 126b3b6842
1 changed files with 23 additions and 27 deletions
Download patch file Download diff file Expand all files Collapse all files

50
kernel/sched/cpudeadline.c
View file

@ -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);
}
static void cpudl_heapify(struct cpudl *cp, int idx)
static void cpudl_heapify_down(struct cpudl *cp, int idx)
{
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));
if (dl_time_before(new_dl, cp->elements[idx].dl)) {
cp->elements[idx].dl = new_dl;
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);
}
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)
{
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->elements[new_cpu].idx = old_idx;
cp->elements[cpu].idx = IDX_INVALID;
while (old_idx > 0 && dl_time_before(
cp->elements[parent(old_idx)].dl,
cp->elements[old_idx].dl)) {
cpudl_exchange(cp, old_idx, parent(old_idx));
old_idx = parent(old_idx);
}
cpudl_heapify(cp, old_idx);
cpumask_set_cpu(cpu, cp->free_cpus);
cpudl_heapify(cp, old_idx);
goto out;
}
if (old_idx == IDX_INVALID) {
cp->size++;
cp->elements[cp->size - 1].dl = dl;
cp->elements[cp->size - 1].cpu = cpu;
cp->elements[cpu].idx = cp->size - 1;
cpudl_change_key(cp, cp->size - 1, dl);
int new_idx = cp->size++;
cp->elements[new_idx].dl = dl;
cp->elements[new_idx].cpu = cpu;
cp->elements[cpu].idx = new_idx;
cpudl_heapify_up(cp, new_idx);
cpumask_clear_cpu(cpu, cp->free_cpus);
} else {
cpudl_change_key(cp, old_idx, dl);
cp->elements[old_idx].dl = dl;
cpudl_heapify(cp, old_idx);
}
out: