Re: [PATCH -next v8 2/4] block, bfq: record how many queues have pending requests

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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




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