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Date: Mon, 19 Sep 2022 10:46:33 +0200
From: Jan Kara <jack@...e.cz>
To: Yu Kuai <yukuai1@...weicloud.com>
Cc: tj@...nel.org, axboe@...nel.dk, paolo.valente@...aro.org,
jack@...e.cz, cgroups@...r.kernel.org, linux-block@...r.kernel.org,
linux-kernel@...r.kernel.org, yukuai3@...wei.com,
yi.zhang@...wei.com
Subject: Re: [patch v11 5/6] block, bfq: cleanup bfq_weights_tree add/remove
apis
On Fri 16-09-22 15:19:41, Yu Kuai wrote:
> From: Yu Kuai <yukuai3@...wei.com>
>
> The 'bfq_data' and 'rb_root_cached' can both be accessed through
> 'bfq_queue', thus only pass 'bfq_queue' as parameter.
>
> Signed-off-by: Yu Kuai <yukuai3@...wei.com>
Looks good. Feel free to add:
Reviewed-by: Jan Kara <jack@...e.cz>
Honza
> ---
> block/bfq-iosched.c | 19 +++++++++----------
> block/bfq-iosched.h | 10 +++-------
> block/bfq-wf2q.c | 18 ++++++------------
> 3 files changed, 18 insertions(+), 29 deletions(-)
>
> diff --git a/block/bfq-iosched.c b/block/bfq-iosched.c
> index 6d95b0e488a8..4ad4fa0dad4a 100644
> --- a/block/bfq-iosched.c
> +++ b/block/bfq-iosched.c
> @@ -870,9 +870,9 @@ static bool bfq_asymmetric_scenario(struct bfq_data *bfqd,
> * In most scenarios, the rate at which nodes are created/destroyed
> * should be low too.
> */
> -void bfq_weights_tree_add(struct bfq_data *bfqd, struct bfq_queue *bfqq,
> - struct rb_root_cached *root)
> +void bfq_weights_tree_add(struct bfq_queue *bfqq)
> {
> + struct rb_root_cached *root = &bfqq->bfqd->queue_weights_tree;
> struct bfq_entity *entity = &bfqq->entity;
> struct rb_node **new = &(root->rb_root.rb_node), *parent = NULL;
> bool leftmost = true;
> @@ -944,13 +944,14 @@ void bfq_weights_tree_add(struct bfq_data *bfqd, struct bfq_queue *bfqq,
> * See the comments to the function bfq_weights_tree_add() for considerations
> * about overhead.
> */
> -void __bfq_weights_tree_remove(struct bfq_data *bfqd,
> - struct bfq_queue *bfqq,
> - struct rb_root_cached *root)
> +void __bfq_weights_tree_remove(struct bfq_queue *bfqq)
> {
> + struct rb_root_cached *root;
> +
> if (!bfqq->weight_counter)
> return;
>
> + root = &bfqq->bfqd->queue_weights_tree;
> bfqq->weight_counter->num_active--;
> if (bfqq->weight_counter->num_active > 0)
> goto reset_entity_pointer;
> @@ -967,11 +968,9 @@ void __bfq_weights_tree_remove(struct bfq_data *bfqd,
> * Invoke __bfq_weights_tree_remove on bfqq and decrement the number
> * of active groups for each queue's inactive parent entity.
> */
> -void bfq_weights_tree_remove(struct bfq_data *bfqd,
> - struct bfq_queue *bfqq)
> +void bfq_weights_tree_remove(struct bfq_queue *bfqq)
> {
> - __bfq_weights_tree_remove(bfqd, bfqq,
> - &bfqd->queue_weights_tree);
> + __bfq_weights_tree_remove(bfqq);
> }
>
> /*
> @@ -6220,7 +6219,7 @@ static void bfq_completed_request(struct bfq_queue *bfqq, struct bfq_data *bfqd)
> bfqq->budget_timeout = jiffies;
>
> bfq_del_bfqq_in_groups_with_pending_reqs(bfqq);
> - bfq_weights_tree_remove(bfqd, bfqq);
> + bfq_weights_tree_remove(bfqq);
> }
>
> now_ns = ktime_get_ns();
> diff --git a/block/bfq-iosched.h b/block/bfq-iosched.h
> index 257acb54c6dc..4bb58ab0c90a 100644
> --- a/block/bfq-iosched.h
> +++ b/block/bfq-iosched.h
> @@ -973,13 +973,9 @@ struct bfq_queue *bic_to_bfqq(struct bfq_io_cq *bic, bool is_sync);
> void bic_set_bfqq(struct bfq_io_cq *bic, struct bfq_queue *bfqq, bool is_sync);
> struct bfq_data *bic_to_bfqd(struct bfq_io_cq *bic);
> void bfq_pos_tree_add_move(struct bfq_data *bfqd, struct bfq_queue *bfqq);
> -void bfq_weights_tree_add(struct bfq_data *bfqd, struct bfq_queue *bfqq,
> - struct rb_root_cached *root);
> -void __bfq_weights_tree_remove(struct bfq_data *bfqd,
> - struct bfq_queue *bfqq,
> - struct rb_root_cached *root);
> -void bfq_weights_tree_remove(struct bfq_data *bfqd,
> - struct bfq_queue *bfqq);
> +void bfq_weights_tree_add(struct bfq_queue *bfqq);
> +void __bfq_weights_tree_remove(struct bfq_queue *bfqq);
> +void bfq_weights_tree_remove(struct bfq_queue *bfqq);
> void bfq_bfqq_expire(struct bfq_data *bfqd, struct bfq_queue *bfqq,
> bool compensate, enum bfqq_expiration reason);
> void bfq_put_queue(struct bfq_queue *bfqq);
> diff --git a/block/bfq-wf2q.c b/block/bfq-wf2q.c
> index 5e8224c96921..124aaea6196e 100644
> --- a/block/bfq-wf2q.c
> +++ b/block/bfq-wf2q.c
> @@ -707,7 +707,6 @@ __bfq_entity_update_weight_prio(struct bfq_service_tree *old_st,
> struct bfq_queue *bfqq = bfq_entity_to_bfqq(entity);
> unsigned int prev_weight, new_weight;
> struct bfq_data *bfqd = NULL;
> - struct rb_root_cached *root;
> #ifdef CONFIG_BFQ_GROUP_IOSCHED
> struct bfq_sched_data *sd;
> struct bfq_group *bfqg;
> @@ -770,19 +769,15 @@ __bfq_entity_update_weight_prio(struct bfq_service_tree *old_st,
> * queue, remove the entity from its old weight counter (if
> * there is a counter associated with the entity).
> */
> - if (prev_weight != new_weight && bfqq) {
> - root = &bfqd->queue_weights_tree;
> - __bfq_weights_tree_remove(bfqd, bfqq, root);
> - }
> + if (prev_weight != new_weight && bfqq)
> + __bfq_weights_tree_remove(bfqq);
> entity->weight = new_weight;
> /*
> * Add the entity, if it is not a weight-raised queue,
> * to the counter associated with its new weight.
> */
> - if (prev_weight != new_weight && bfqq && bfqq->wr_coeff == 1) {
> - /* If we get here, root has been initialized. */
> - bfq_weights_tree_add(bfqd, bfqq, root);
> - }
> + if (prev_weight != new_weight && bfqq && bfqq->wr_coeff == 1)
> + bfq_weights_tree_add(bfqq);
>
> new_st->wsum += entity->weight;
>
> @@ -1687,7 +1682,7 @@ void bfq_del_bfqq_busy(struct bfq_queue *bfqq, bool expiration)
> * Next function is invoked last, because it causes bfqq to be
> * freed. DO NOT use bfqq after the next function invocation.
> */
> - bfq_weights_tree_remove(bfqd, bfqq);
> + bfq_weights_tree_remove(bfqq);
> }
> }
>
> @@ -1708,8 +1703,7 @@ void bfq_add_bfqq_busy(struct bfq_queue *bfqq)
> if (!bfqq->dispatched) {
> bfq_add_bfqq_in_groups_with_pending_reqs(bfqq);
> if (bfqq->wr_coeff == 1)
> - bfq_weights_tree_add(bfqd, bfqq,
> - &bfqd->queue_weights_tree);
> + bfq_weights_tree_add(bfqq);
> }
>
> if (bfqq->wr_coeff > 1)
> --
> 2.31.1
>
--
Jan Kara <jack@...e.com>
SUSE Labs, CR
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