From: Yu Kuai <yukuai3@xxxxxxxxxx>
Prepare to refactor the counting of 'num_groups_with_pending_reqs'.
Add a counter in bfq_group, update it while tracking if bfqq have pending
requests and when bfq_bfqq_move() is called.
Signed-off-by: Yu Kuai <yukuai3@xxxxxxxxxx>
Reviewed-by: Jan Kara <jack@xxxxxxx>
---
block/bfq-cgroup.c | 10 ++++++++++
block/bfq-iosched.h | 1 +
block/bfq-wf2q.c | 12 ++++++++++--
3 files changed, 21 insertions(+), 2 deletions(-)
diff --git a/block/bfq-cgroup.c b/block/bfq-cgroup.c
index 144bca006463..4c37398e0b99 100644
--- a/block/bfq-cgroup.c
+++ b/block/bfq-cgroup.c
@@ -552,6 +552,7 @@ static void bfq_pd_init(struct blkg_policy_data *pd)
*/
bfqg->bfqd = bfqd;
bfqg->active_entities = 0;
+ bfqg->num_queues_with_pending_reqs = 0;
bfqg->online = true;
bfqg->rq_pos_tree = RB_ROOT;
}
@@ -641,6 +642,7 @@ void bfq_bfqq_move(struct bfq_data *bfqd, struct bfq_queue *bfqq,
{
struct bfq_entity *entity = &bfqq->entity;
struct bfq_group *old_parent = bfqq_group(bfqq);
+ bool has_pending_reqs = false;
/*
* No point to move bfqq to the same group, which can happen when
@@ -661,6 +663,11 @@ void bfq_bfqq_move(struct bfq_data *bfqd, struct bfq_queue *bfqq,
*/
bfqq->ref++;
+ if (entity->in_groups_with_pending_reqs) {
+ has_pending_reqs = true;
+ bfq_del_bfqq_in_groups_with_pending_reqs(bfqq);
+ }
+
/* If bfqq is empty, then bfq_bfqq_expire also invokes
* bfq_del_bfqq_busy, thereby removing bfqq and its entity
* from data structures related to current group. Otherwise we
@@ -688,6 +695,9 @@ void bfq_bfqq_move(struct bfq_data *bfqd, struct bfq_queue *bfqq,
/* pin down bfqg and its associated blkg */
bfqg_and_blkg_get(bfqg);
+ if (has_pending_reqs)
+ bfq_add_bfqq_in_groups_with_pending_reqs(bfqq);
+
if (bfq_bfqq_busy(bfqq)) {
if (unlikely(!bfqd->nonrot_with_queueing))
bfq_pos_tree_add_move(bfqd, bfqq);
diff --git a/block/bfq-iosched.h b/block/bfq-iosched.h
index 44e08b194749..338ff5418ea8 100644
--- a/block/bfq-iosched.h
+++ b/block/bfq-iosched.h
@@ -943,6 +943,7 @@ struct bfq_group {
struct bfq_entity *my_entity;
int active_entities;
+ int num_queues_with_pending_reqs;
struct rb_root rq_pos_tree;
diff --git a/block/bfq-wf2q.c b/block/bfq-wf2q.c
index bd8f4ed84848..5549ccf09cd2 100644
--- a/block/bfq-wf2q.c
+++ b/block/bfq-wf2q.c
@@ -1650,16 +1650,24 @@ void bfq_add_bfqq_in_groups_with_pending_reqs(struct bfq_queue *bfqq)
{
struct bfq_entity *entity = &bfqq->entity;
- if (!entity->in_groups_with_pending_reqs)
+ if (!entity->in_groups_with_pending_reqs) {
entity->in_groups_with_pending_reqs = true;
+#ifdef CONFIG_BFQ_GROUP_IOSCHED
+ bfqq_group(bfqq)->num_queues_with_pending_reqs++;
+#endif
+ }
}
void bfq_del_bfqq_in_groups_with_pending_reqs(struct bfq_queue *bfqq)
{
struct bfq_entity *entity = &bfqq->entity;
- if (entity->in_groups_with_pending_reqs)
+ if (entity->in_groups_with_pending_reqs) {
entity->in_groups_with_pending_reqs = false;
+#ifdef CONFIG_BFQ_GROUP_IOSCHED
+ bfqq_group(bfqq)->num_queues_with_pending_reqs--;
+#endif
+ }
}
/*
--
2.31.1
