linux-kernel - Re: [PATCH -next v4 1/3] block, bfq: record how many queues are busy in bfq

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Date:   Thu, 28 Apr 2022 13:18:00 +0200
From:   Jan Kara <jack@...e.cz>
To:     Yu Kuai <yukuai3@...wei.com>
Cc:     jack@...e.cz, tj@...nel.org, axboe@...nel.dk,
        paolo.valente@...aro.org, cgroups@...r.kernel.org,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        yi.zhang@...wei.com
Subject: Re: [PATCH -next v4 1/3] block, bfq: record how many queues are busy
 in bfq_group

On Thu 28-04-22 19:19:05, Yu Kuai wrote:
> Prepare to refactor the counting of 'num_groups_with_pending_reqs'.
> 
> Add a counter 'busy_queues' in bfq_group, and update it in
> bfq_add/del_bfqq_busy().
> 
> Signed-off-by: Yu Kuai <yukuai3@...wei.com>

Just two nits below:

> --- a/block/bfq-wf2q.c
> +++ b/block/bfq-wf2q.c
> @@ -218,6 +218,16 @@ static bool bfq_no_longer_next_in_service(struct bfq_entity *entity)
>  	return false;
>  }
>  
> +static void bfq_add_busy_queues(struct bfq_queue *bfqq)
> +{
> +	bfqq_group(bfqq)->busy_queues++;
> +}
> +
> +static void bfq_dec_busy_queues(struct bfq_queue *bfqq)
> +{
> +	bfqq_group(bfqq)->busy_queues--;
> +}
> +

An opposite from "decrement" is "increment", not "add". So
bfq_add_busy_queues() should be bfq_inc_busy_queues().

> @@ -230,6 +240,14 @@ static bool bfq_no_longer_next_in_service(struct bfq_entity *entity)
>  	return true;
>  }
>  
> +static void bfq_add_busy_queues(struct bfq_queue *bfqq)
> +{
> +}
> +
> +static void bfq_add_busy_queues(struct bfq_queue *bfqq)
> +{
> +}
> +

You have two times the same function here and you miss the other one...

								Honza
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR