在 2022/06/01 16:35, Jan Kara 写道:
On Tue 31-05-22 22:08:56, Yu Kuai wrote:
Prepare to refactor the counting of 'num_groups_with_pending_reqs'.
Add a counter in bfq_group, and update it while tracking if bfqq have
pending requests.
Signed-off-by: Yu Kuai <yukuai3@xxxxxxxxxx>
Looks good, except I think that we also need to update the counters
'num_groups_with_pending_reqs' in bfq_move_bfqq()?
Yes, you're right. I'll do that in next version.
Thanks,
Kuai
Honza
---
block/bfq-cgroup.c | 1 +
block/bfq-iosched.h | 1 +
block/bfq-wf2q.c | 12 ++++++++++--
3 files changed, 12 insertions(+), 2 deletions(-)
diff --git a/block/bfq-cgroup.c b/block/bfq-cgroup.c
index 09574af83566..0954a258a107 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;
}
diff --git a/block/bfq-iosched.h b/block/bfq-iosched.h
index 3b9b1a0e7c1c..a5f7c0c1a3b3 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 12d20f26ad69..b533e17e9f0c 100644
--- a/block/bfq-wf2q.c
+++ b/block/bfq-wf2q.c
@@ -1651,16 +1651,24 @@ static 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
