linux-kernel - Re: [PATCH BUGFIX/IMPROVEMENT 1/6] block, bfq: always inject I/O of queues blocked by wakers

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Date:   Thu, 25 Feb 2021 16:58:59 +0100
From:   Paolo Valente <paolo.valente@...aro.org>
To:     Jens Axboe <axboe@...nel.dk>
Cc:     linux-block <linux-block@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Jan Kara <jack@...e.cz>
Subject: Re: [PATCH BUGFIX/IMPROVEMENT 1/6] block, bfq: always inject I/O of
 queues blocked by wakers



> Il giorno 26 gen 2021, alle ore 17:17, Jens Axboe <axboe@...nel.dk> ha scritto:
> 
> On 1/26/21 3:50 AM, Paolo Valente wrote:
>> diff --git a/block/bfq-iosched.c b/block/bfq-iosched.c
>> index 445cef9c0bb9..a83149407336 100644
>> --- a/block/bfq-iosched.c
>> +++ b/block/bfq-iosched.c
>> @@ -4487,9 +4487,15 @@ static struct bfq_queue *bfq_select_queue(struct bfq_data *bfqd)
>> 			bfq_bfqq_busy(bfqq->bic->bfqq[0]) &&
>> 			bfqq->bic->bfqq[0]->next_rq ?
>> 			bfqq->bic->bfqq[0] : NULL;
>> +		struct bfq_queue *blocked_bfqq =
>> +			!hlist_empty(&bfqq->woken_list) ?
>> +			container_of(bfqq->woken_list.first,
>> +				     struct bfq_queue,
>> +				     woken_list_node)
>> +			: NULL;
> 
> hlist_first_entry_or_null?
> 

I didn't find any such function.  There is a list_first_entry_or_null,
but it's for circular doubly linked lists.

I'll wait a little bit for your reply, then send a V2 with this patch
unchanged.

Thanks,
Paolo

> -- 
> Jens Axboe
>