'num_groups_with_pending_reqs' represents how many groups that are
not root group and have pending requests. This patch also counted
root group into 'num_groups_with_pending_reqs'.
Signed-off-by: Yu Kuai <yukuai3@xxxxxxxxxx>
---
block/bfq-iosched.c | 36 ++++++++++++++++++++++++++------
block/bfq-wf2q.c | 50 +++++++++++++++++++++++++++++++++------------
2 files changed, 67 insertions(+), 19 deletions(-)
diff --git a/block/bfq-iosched.c b/block/bfq-iosched.c
index fec18118dc30..d251735383f7 100644
--- a/block/bfq-iosched.c
+++ b/block/bfq-iosched.c
@@ -852,6 +852,16 @@ void __bfq_weights_tree_remove(struct bfq_data *bfqd,
bfq_put_queue(bfqq);
}
+static inline void
+bfq_clear_group_with_pending_reqs(struct bfq_data *bfqd,
+ struct bfq_entity *entity)
+{
+ if (entity->in_groups_with_pending_reqs) {
+ entity->in_groups_with_pending_reqs = false;
+ bfqd->num_groups_with_pending_reqs--;
+ }
+}
+
/*
* Invoke __bfq_weights_tree_remove on bfqq and decrement the number
* of active groups for each queue's inactive parent entity.
@@ -860,9 +870,25 @@ void bfq_weights_tree_remove(struct bfq_data *bfqd,
struct bfq_queue *bfqq)
{
struct bfq_entity *entity = bfqq->entity.parent;
+ struct bfq_sched_data *sd;
+
+ /*
+ * If the bfq queue is in root group, the decrement of
+ * num_groups_with_pending_reqs is performed immediately upon the
+ * deactivation of entity.
+ */
+ if (!entity) {
+ entity = &bfqd->root_group->entity;
+ sd = entity->my_sched_data;
+
+ if (!sd->in_service_entity)
+ bfq_clear_group_with_pending_reqs(bfqd, entity);
+
+ return;
+ }
for_each_entity(entity) {
- struct bfq_sched_data *sd = entity->my_sched_data;
+ sd = entity->my_sched_data;
if (sd->next_in_service || sd->in_service_entity) {
/*
@@ -880,7 +906,8 @@ void bfq_weights_tree_remove(struct bfq_data *bfqd,
}
/*
- * The decrement of num_groups_with_pending_reqs is
+ * If the bfq queue is not in root group,
+ * the decrement of num_groups_with_pending_reqs is
* not performed immediately upon the deactivation of
* entity, but it is delayed to when it also happens
* that the first leaf descendant bfqq of entity gets
@@ -889,10 +916,7 @@ void bfq_weights_tree_remove(struct bfq_data *bfqd,
* needed. See the comments on
* num_groups_with_pending_reqs for details.
*/
- if (entity->in_groups_with_pending_reqs) {
- entity->in_groups_with_pending_reqs = false;
- bfqd->num_groups_with_pending_reqs--;
- }
+ bfq_clear_group_with_pending_reqs(bfqd, entity);
}
/*
diff --git a/block/bfq-wf2q.c b/block/bfq-wf2q.c
index b74cc0da118e..3e9e672aa302 100644
--- a/block/bfq-wf2q.c
+++ b/block/bfq-wf2q.c
@@ -945,6 +945,42 @@ static void bfq_update_fin_time_enqueue(struct bfq_entity *entity,
bfq_active_insert(st, entity);
}
+#ifdef CONFIG_BFQ_GROUP_IOSCHED
+static inline void
+bfq_set_group_with_pending_reqs(struct bfq_data *bfqd,
+ struct bfq_entity *entity)
+{
+ if (!entity->in_groups_with_pending_reqs) {
+ entity->in_groups_with_pending_reqs = true;
+ bfqd->num_groups_with_pending_reqs++;
+ }
+}
+
+static void bfq_update_groups_with_pending_reqs(struct bfq_entity *entity)
+{
+ struct bfq_queue *bfqq = bfq_entity_to_bfqq(entity);
+
+ if (bfqq) {
+ /*
+ * If the entity represents bfq_queue, and the queue belongs to
+ * root cgroup.
+ */
+ if (!entity->parent)
+ bfq_set_group_with_pending_reqs(bfqq->bfqd,
+ &bfqq->bfqd->root_group->entity);
+ } else {
+ /* If the entity represents bfq_group. */
+ struct bfq_group *bfqg =
+ container_of(entity, struct bfq_group, entity);
+ struct bfq_data *bfqd = bfqg->bfqd;
+
+ bfq_set_group_with_pending_reqs(bfqd, entity);
+ }
+}
+#else
+#define bfq_update_groups_with_pending_reqs(entity) \
+ do {} while (0)
+#endif
/**
* __bfq_activate_entity - handle activation of entity.
@@ -999,19 +1035,7 @@ static void __bfq_activate_entity(struct bfq_entity *entity,
entity->on_st_or_in_serv = true;
}
-#ifdef CONFIG_BFQ_GROUP_IOSCHED
- if (!bfq_entity_to_bfqq(entity)) { /* bfq_group */
- struct bfq_group *bfqg =
- container_of(entity, struct bfq_group, entity);
- struct bfq_data *bfqd = bfqg->bfqd;
-
- if (!entity->in_groups_with_pending_reqs) {
- entity->in_groups_with_pending_reqs = true;
- bfqd->num_groups_with_pending_reqs++;
- }
- }
-#endif
-
+ bfq_update_groups_with_pending_reqs(entity);
bfq_update_fin_time_enqueue(entity, st, backshifted);
}
--
2.31.1
