linux-kernel - Re: [RESEND PATCH 1/8] bfq: introduce bfq_entity_to

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Message-ID: <20210610083147.xoefokucl5ey7v32@spock.localdomain>
Date:   Thu, 10 Jun 2021 10:31:47 +0200
From:   Oleksandr Natalenko <oleksandr@...alenko.name>
To:     brookxu <brookxu.cn@...il.com>
Cc:     paolo.valente@...aro.org, axboe@...nel.dk,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        Piotr Gorski <lucjan.lucjanov@...il.com>
Subject: Re: [RESEND PATCH 1/8] bfq: introduce bfq_entity_to_bfqg helper
 method

Hello.

On Thu, Jun 10, 2021 at 03:22:30PM +0800, brookxu wrote:
> From: Chunguang Xu <brookxu@...cent.com>
> 
> Introduce bfq_entity_to_bfqg() to make it easier to obtain the
> bfq_group corresponding to the entity.
> 
> Signed-off-by: Chunguang Xu <brookxu@...cent.com>
> ---
>  block/bfq-cgroup.c  |  6 ++----
>  block/bfq-iosched.h |  1 +
>  block/bfq-wf2q.c    | 16 ++++++++++++----
>  3 files changed, 15 insertions(+), 8 deletions(-)
> 
> diff --git a/block/bfq-cgroup.c b/block/bfq-cgroup.c
> index b791e20..a5f544a 100644
> --- a/block/bfq-cgroup.c
> +++ b/block/bfq-cgroup.c
> @@ -309,8 +309,7 @@ struct bfq_group *bfqq_group(struct bfq_queue *bfqq)
>  {
>  	struct bfq_entity *group_entity = bfqq->entity.parent;
>  
> -	return group_entity ? container_of(group_entity, struct bfq_group,
> -					   entity) :
> +	return group_entity ? bfq_entity_to_bfqg(group_entity) :
>  			      bfqq->bfqd->root_group;
>  }
>  
> @@ -610,8 +609,7 @@ struct bfq_group *bfq_find_set_group(struct bfq_data *bfqd,
>  	 */
>  	entity = &bfqg->entity;
>  	for_each_entity(entity) {
> -		struct bfq_group *curr_bfqg = container_of(entity,
> -						struct bfq_group, entity);
> +		struct bfq_group *curr_bfqg = bfq_entity_to_bfqg(entity);
>  		if (curr_bfqg != bfqd->root_group) {
>  			parent = bfqg_parent(curr_bfqg);
>  			if (!parent)
> diff --git a/block/bfq-iosched.h b/block/bfq-iosched.h
> index b8e793c..a6f98e9 100644
> --- a/block/bfq-iosched.h
> +++ b/block/bfq-iosched.h
> @@ -941,6 +941,7 @@ struct bfq_group {
>  #endif
>  
>  struct bfq_queue *bfq_entity_to_bfqq(struct bfq_entity *entity);
> +struct bfq_group *bfq_entity_to_bfqg(struct bfq_entity *entity);
>  
>  /* --------------- main algorithm interface ----------------- */
>  
> diff --git a/block/bfq-wf2q.c b/block/bfq-wf2q.c
> index 070e34a..5ff0028 100644
> --- a/block/bfq-wf2q.c
> +++ b/block/bfq-wf2q.c
> @@ -149,7 +149,7 @@ struct bfq_group *bfq_bfqq_to_bfqg(struct bfq_queue *bfqq)
>  	if (!group_entity)
>  		group_entity = &bfqq->bfqd->root_group->entity;
>  
> -	return container_of(group_entity, struct bfq_group, entity);
> +	return bfq_entity_to_bfqg(group_entity);
>  }
>  
>  /*
> @@ -208,7 +208,7 @@ static bool bfq_no_longer_next_in_service(struct bfq_entity *entity)
>  	if (bfq_entity_to_bfqq(entity))
>  		return true;
>  
> -	bfqg = container_of(entity, struct bfq_group, entity);
> +	bfqg = bfq_entity_to_bfqg(entity);
>  
>  	/*
>  	 * The field active_entities does not always contain the
> @@ -266,6 +266,15 @@ struct bfq_queue *bfq_entity_to_bfqq(struct bfq_entity *entity)
>  	return bfqq;
>  }
>  
> +struct bfq_group *bfq_entity_to_bfqg(struct bfq_entity *entity)
> +{
> +	struct bfq_group *bfqg = NULL;
> +
> +	if (entity->my_sched_data)
> +		bfqg = container_of(entity, struct bfq_group, entity);
> +
> +	return bfqg;
> +}
>  
>  /**
>   * bfq_delta - map service into the virtual time domain.
> @@ -1001,8 +1010,7 @@ static void __bfq_activate_entity(struct bfq_entity *entity,
>  
>  #ifdef CONFIG_BFQ_GROUP_IOSCHED
>  	if (!bfq_entity_to_bfqq(entity)) { /* bfq_group */
> -		struct bfq_group *bfqg =
> -			container_of(entity, struct bfq_group, entity);
> +		struct bfq_group *bfqg = bfq_entity_to_bfqg(entity);
>  		struct bfq_data *bfqd = bfqg->bfqd;
>  
>  		if (!entity->in_groups_with_pending_reqs) {
> -- 
> 1.8.3.1
> 

If it is a resend only, I can offer my Tested-by since I'm running this
series for quite some time already.

Thanks.

-- 
  Oleksandr Natalenko (post-factum)