linux-kernel - Re: [PATCH 2/2] bfq: ignore oom_bfqq in bfq_check

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Date:   Wed, 9 Nov 2022 12:14:54 +0100
From:   Jan Kara <jack@...e.cz>
To:     Khazhismel Kumykov <khazhy@...omium.org>
Cc:     Paolo Valente <paolo.valente@...aro.org>,
        Jens Axboe <axboe@...nel.dk>, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org, Yu Kuai <yukuai1@...weicloud.com>,
        Jan Kara <jack@...e.cz>, Khazhismel Kumykov <khazhy@...gle.com>
Subject: Re: [PATCH 2/2] bfq: ignore oom_bfqq in bfq_check_waker

On Tue 08-11-22 10:10:30, Khazhismel Kumykov wrote:
> oom_bfqq is just a fallback bfqq, so shouldn't be used with waker
> detection.
> 
> Suggested-by: Jan Kara <jack@...e.cz>
> Signed-off-by: Khazhismel Kumykov <khazhy@...gle.com>

Looks good. Feel free to add:

Reviewed-by: Jan Kara <jack@...e.cz>

								Honza

> ---
>  block/bfq-iosched.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/block/bfq-iosched.c b/block/bfq-iosched.c
> index ca04ec868c40..267baf84870f 100644
> --- a/block/bfq-iosched.c
> +++ b/block/bfq-iosched.c
> @@ -2135,7 +2135,9 @@ static void bfq_check_waker(struct bfq_data *bfqd, struct bfq_queue *bfqq,
>  	if (!bfqd->last_completed_rq_bfqq ||
>  	    bfqd->last_completed_rq_bfqq == bfqq ||
>  	    bfq_bfqq_has_short_ttime(bfqq) ||
> -	    now_ns - bfqd->last_completion >= 4 * NSEC_PER_MSEC)
> +	    now_ns - bfqd->last_completion >= 4 * NSEC_PER_MSEC ||
> +	    bfqd->last_completed_rq_bfqq == &bfqd->oom_bfqq ||
> +	    bfqq == &bfqd->oom_bfqq)
>  		return;
>  
>  	/*
> -- 
> 2.38.1.431.g37b22c650d-goog
> 
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR