linux-kernel - Re: [PATCH v3 1/2] blk-mq: Some tag allocation code refactoring

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Message-ID: <YJ3abcOPU3rvh51i@T590>
Date:   Fri, 14 May 2021 10:03:25 +0800
From:   Ming Lei <ming.lei@...hat.com>
To:     John Garry <john.garry@...wei.com>
Cc:     axboe@...nel.dk, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org,
        kashyap.desai@...adcom.com, chenxiang66@...ilicon.com,
        yama@...hat.com, dgilbert@...erlog.com
Subject: Re: [PATCH v3 1/2] blk-mq: Some tag allocation code refactoring

On Thu, May 13, 2021 at 08:00:57PM +0800, John Garry wrote:
> The tag allocation code to alloc the sbitmap pairs is common for regular
> bitmaps tags and shared sbitmap, so refactor into a common function.
> 
> Also remove superfluous "flags" argument from blk_mq_init_shared_sbitmap().
> 
> Signed-off-by: John Garry <john.garry@...wei.com>
> ---
>  block/blk-mq-tag.c | 54 ++++++++++++++++++++++++++++------------------
>  block/blk-mq-tag.h |  9 +++++---
>  block/blk-mq.c     |  2 +-
>  3 files changed, 40 insertions(+), 25 deletions(-)
> 
> diff --git a/block/blk-mq-tag.c b/block/blk-mq-tag.c
> index 2a37731e8244..45479c0f88a2 100644
> --- a/block/blk-mq-tag.c
> +++ b/block/blk-mq-tag.c
> @@ -445,39 +445,54 @@ static int bt_alloc(struct sbitmap_queue *bt, unsigned int depth,
>  				       node);
>  }
>  
> -static int blk_mq_init_bitmap_tags(struct blk_mq_tags *tags,
> -				   int node, int alloc_policy)
> +int blk_mq_init_bitmaps(struct sbitmap_queue *bitmap_tags,
> +			struct sbitmap_queue *breserved_tags,
> +			unsigned int queue_depth, unsigned int reserved,
> +			int node, int alloc_policy)
>  {
> -	unsigned int depth = tags->nr_tags - tags->nr_reserved_tags;
> +	unsigned int depth = queue_depth - reserved;
>  	bool round_robin = alloc_policy == BLK_TAG_ALLOC_RR;
>  
> -	if (bt_alloc(&tags->__bitmap_tags, depth, round_robin, node))
> +	if (bt_alloc(bitmap_tags, depth, round_robin, node))
>  		return -ENOMEM;
> -	if (bt_alloc(&tags->__breserved_tags, tags->nr_reserved_tags,
> -		     round_robin, node))
> +	if (bt_alloc(breserved_tags, reserved, round_robin, node))
>  		goto free_bitmap_tags;
>  
> +	return 0;
> +
> +free_bitmap_tags:
> +	sbitmap_queue_free(bitmap_tags);
> +	return -ENOMEM;
> +}
> +
> +static int blk_mq_init_bitmap_tags(struct blk_mq_tags *tags,
> +				   int node, int alloc_policy)
> +{
> +	int ret;
> +
> +	ret = blk_mq_init_bitmaps(&tags->__bitmap_tags,
> +				  &tags->__breserved_tags,
> +				  tags->nr_tags, tags->nr_reserved_tags,
> +				  node, alloc_policy);
> +	if (ret)
> +		return ret;
> +
>  	tags->bitmap_tags = &tags->__bitmap_tags;
>  	tags->breserved_tags = &tags->__breserved_tags;
>  
>  	return 0;
> -free_bitmap_tags:
> -	sbitmap_queue_free(&tags->__bitmap_tags);
> -	return -ENOMEM;
>  }
>  
> -int blk_mq_init_shared_sbitmap(struct blk_mq_tag_set *set, unsigned int flags)
> +int blk_mq_init_shared_sbitmap(struct blk_mq_tag_set *set)
>  {
> -	unsigned int depth = set->queue_depth - set->reserved_tags;
>  	int alloc_policy = BLK_MQ_FLAG_TO_ALLOC_POLICY(set->flags);
> -	bool round_robin = alloc_policy == BLK_TAG_ALLOC_RR;
> -	int i, node = set->numa_node;
> +	int i, ret;
>  
> -	if (bt_alloc(&set->__bitmap_tags, depth, round_robin, node))
> -		return -ENOMEM;
> -	if (bt_alloc(&set->__breserved_tags, set->reserved_tags,
> -		     round_robin, node))
> -		goto free_bitmap_tags;
> +	ret = blk_mq_init_bitmaps(&set->__bitmap_tags, &set->__breserved_tags,
> +				  set->queue_depth, set->reserved_tags,
> +				  set->numa_node, alloc_policy);
> +	if (ret)
> +		return ret;
>  
>  	for (i = 0; i < set->nr_hw_queues; i++) {
>  		struct blk_mq_tags *tags = set->tags[i];
> @@ -487,9 +502,6 @@ int blk_mq_init_shared_sbitmap(struct blk_mq_tag_set *set, unsigned int flags)
>  	}
>  
>  	return 0;
> -free_bitmap_tags:
> -	sbitmap_queue_free(&set->__bitmap_tags);
> -	return -ENOMEM;
>  }
>  
>  void blk_mq_exit_shared_sbitmap(struct blk_mq_tag_set *set)
> diff --git a/block/blk-mq-tag.h b/block/blk-mq-tag.h
> index 7d3e6b333a4a..2a718c8d080f 100644
> --- a/block/blk-mq-tag.h
> +++ b/block/blk-mq-tag.h
> @@ -26,11 +26,14 @@ extern struct blk_mq_tags *blk_mq_init_tags(unsigned int nr_tags,
>  					unsigned int reserved_tags,
>  					int node, unsigned int flags);
>  extern void blk_mq_free_tags(struct blk_mq_tags *tags, unsigned int flags);
> +extern int blk_mq_init_bitmaps(struct sbitmap_queue *bitmap_tags,
> +			       struct sbitmap_queue *breserved_tags,
> +			       unsigned int queue_depth,
> +			       unsigned int reserved,
> +			       int node, int alloc_policy);
>  
> -extern int blk_mq_init_shared_sbitmap(struct blk_mq_tag_set *set,
> -				      unsigned int flags);
> +extern int blk_mq_init_shared_sbitmap(struct blk_mq_tag_set *set);
>  extern void blk_mq_exit_shared_sbitmap(struct blk_mq_tag_set *set);
> -
>  extern unsigned int blk_mq_get_tag(struct blk_mq_alloc_data *data);
>  extern void blk_mq_put_tag(struct blk_mq_tags *tags, struct blk_mq_ctx *ctx,
>  			   unsigned int tag);
> diff --git a/block/blk-mq.c b/block/blk-mq.c
> index 466676bc2f0b..499ad5462f7e 100644
> --- a/block/blk-mq.c
> +++ b/block/blk-mq.c
> @@ -3488,7 +3488,7 @@ int blk_mq_alloc_tag_set(struct blk_mq_tag_set *set)
>  	if (blk_mq_is_sbitmap_shared(set->flags)) {
>  		atomic_set(&set->active_queues_shared_sbitmap, 0);
>  
> -		if (blk_mq_init_shared_sbitmap(set, set->flags)) {
> +		if (blk_mq_init_shared_sbitmap(set)) {
>  			ret = -ENOMEM;
>  			goto out_free_mq_rq_maps;
>  		}
> -- 
> 2.26.2
> 

Reviewed-by: Ming Lei <ming.lei@...hat.com>

-- 
Ming