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Subject: Re: [RESEND PATCH 1/8] bfq: introduce bfq_entity_to_bfqg helper
 method
To:     Oleksandr Natalenko <oleksandr@natalenko.name>
Cc:     paolo.valente@linaro.org, axboe@kernel.dk,
        linux-block@vger.kernel.org, linux-kernel@vger.kernel.org,
        Piotr Gorski <lucjan.lucjanov@gmail.com>
References: <cover.1618916839.git.brookxu@tencent.com>
 <20210610072230.TAxxdh-wsL4sihK2TJxF-Gz85ZgsFR7IwOuifnxFi0k@z>
 <20210610083147.xoefokucl5ey7v32@spock.localdomain>
From:   brookxu <brookxu.cn@gmail.com>
Message-ID: <eac90e08-eb43-848a-7a5f-e0c84b7ea637@gmail.com>
Date:   Thu, 10 Jun 2021 17:05:05 +0800
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Oleksandr Natalenko wrote on 2021/6/10 16:31:
> Hello.
> 
> On Thu, Jun 10, 2021 at 03:22:30PM +0800, brookxu wrote:
>> From: Chunguang Xu <brookxu@tencent.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@tencent.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.
> 

ok, thank you very much.

> Thanks.
>