linux-kernel - Re: [PATCH -next v8 2/4] block, bfq: record how many queues have pending requests

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Date:   Wed, 1 Jun 2022 18:58:00 +0800
From:   Yu Kuai <yukuai3@...wei.com>
To:     Jan Kara <jack@...e.cz>
CC:     <paolo.valente@...aro.org>, <axboe@...nel.dk>, <tj@...nel.org>,
        <linux-block@...r.kernel.org>, <cgroups@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <yi.zhang@...wei.com>
Subject: Re: [PATCH -next v8 2/4] block, bfq: record how many queues have
 pending requests

在 2022/06/01 16:35, Jan Kara 写道:
> On Tue 31-05-22 22:08:56, Yu Kuai wrote:
>> Prepare to refactor the counting of 'num_groups_with_pending_reqs'.
>>
>> Add a counter in bfq_group, and update it while tracking if bfqq have
>> pending requests.
>>
>> Signed-off-by: Yu Kuai <yukuai3@...wei.com>
> 
> Looks good, except I think that we also need to update the counters
> 'num_groups_with_pending_reqs' in bfq_move_bfqq()?
Yes, you're right. I'll do that in next version.

Thanks,
Kuai
> 
> 								Honza
> 
>> ---
>>   block/bfq-cgroup.c  |  1 +
>>   block/bfq-iosched.h |  1 +
>>   block/bfq-wf2q.c    | 12 ++++++++++--
>>   3 files changed, 12 insertions(+), 2 deletions(-)
>>
>> diff --git a/block/bfq-cgroup.c b/block/bfq-cgroup.c
>> index 09574af83566..0954a258a107 100644
>> --- a/block/bfq-cgroup.c
>> +++ b/block/bfq-cgroup.c
>> @@ -557,6 +557,7 @@ static void bfq_pd_init(struct blkg_policy_data *pd)
>>   				   */
>>   	bfqg->bfqd = bfqd;
>>   	bfqg->active_entities = 0;
>> +	bfqg->num_queues_with_pending_reqs = 0;
>>   	bfqg->online = true;
>>   	bfqg->rq_pos_tree = RB_ROOT;
>>   }
>> diff --git a/block/bfq-iosched.h b/block/bfq-iosched.h
>> index 3b9b1a0e7c1c..a5f7c0c1a3b3 100644
>> --- a/block/bfq-iosched.h
>> +++ b/block/bfq-iosched.h
>> @@ -943,6 +943,7 @@ struct bfq_group {
>>   	struct bfq_entity *my_entity;
>>   
>>   	int active_entities;
>> +	int num_queues_with_pending_reqs;
>>   
>>   	struct rb_root rq_pos_tree;
>>   
>> diff --git a/block/bfq-wf2q.c b/block/bfq-wf2q.c
>> index 12d20f26ad69..b533e17e9f0c 100644
>> --- a/block/bfq-wf2q.c
>> +++ b/block/bfq-wf2q.c
>> @@ -1651,16 +1651,24 @@ static void bfq_add_bfqq_in_groups_with_pending_reqs(struct bfq_queue *bfqq)
>>   {
>>   	struct bfq_entity *entity = &bfqq->entity;
>>   
>> -	if (!entity->in_groups_with_pending_reqs)
>> +	if (!entity->in_groups_with_pending_reqs) {
>>   		entity->in_groups_with_pending_reqs = true;
>> +#ifdef CONFIG_BFQ_GROUP_IOSCHED
>> +		bfqq_group(bfqq)->num_queues_with_pending_reqs++;
>> +#endif
>> +	}
>>   }
>>   
>>   void bfq_del_bfqq_in_groups_with_pending_reqs(struct bfq_queue *bfqq)
>>   {
>>   	struct bfq_entity *entity = &bfqq->entity;
>>   
>> -	if (entity->in_groups_with_pending_reqs)
>> +	if (entity->in_groups_with_pending_reqs) {
>>   		entity->in_groups_with_pending_reqs = false;
>> +#ifdef CONFIG_BFQ_GROUP_IOSCHED
>> +		bfqq_group(bfqq)->num_queues_with_pending_reqs--;
>> +#endif
>> +	}
>>   }
>>   
>>   /*
>> -- 
>> 2.31.1
>>