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

[Jens Axboe]

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?

-- 
Jens Axboe