[PATCH -next v10 2/4] block, bfq: record how many queues have pending requests
From: Yu Kuai <hidden>
Date: 2022-06-10 02:04:41
Also in:
cgroups, lkml
Subsystem:
bfq i/o scheduler, block layer, control group - block io controller (blkio), the rest · Maintainers:
Yu Kuai, Jens Axboe, Tejun Heo, Josef Bacik, Linus Torvalds
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 <redacted> Reviewed-by: Jan Kara <jack@suse.cz> --- 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 09574af83566..88c0c320ddf3 100644
--- a/block/bfq-cgroup.c
+++ b/block/bfq-cgroup.c@@ -557,6 +557,7 @@ 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; }
@@ -646,6 +647,7 @@ 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
@@ -666,6 +668,11 @@ 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
@@ -693,6 +700,9 @@ 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 69c7d15417e5..de2446a9b7ab 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 5704a0315cf2..6f36f3fe5cc8 100644
--- a/block/bfq-wf2q.c
+++ b/block/bfq-wf2q.c@@ -1651,16 +1651,24 @@ 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