From: Jan Kara <jack@suse.cz>
To: Kemeng Shi <shikemeng@huaweicloud.com>
Cc: paolo.valente@linaro.org, axboe@kernel.dk,
linux-block@vger.kernel.org, linux-kernel@vger.kernel.org,
jack@suse.cz, hch@lst.de, damien.lemoal@wdc.com
Subject: Re: [PATCH RESEND v2 06/10] block, bfq: remove redundant bfqd->rq_in_driver > 0 check in bfq_add_request
Date: Mon, 2 Jan 2023 16:54:15 +0100 [thread overview]
Message-ID: <20230102155415.pvl57qtzjk2acwf6@quack3> (raw)
In-Reply-To: <20221222191641.1643117-7-shikemeng@huaweicloud.com>
On Fri 23-12-22 03:16:37, Kemeng Shi wrote:
> The bfqd->rq_in_driver > 0 check is along with previous
> "bfqd->rq_in_driver == 0 ||" check, so no need to re-check
> bfqd->rq_in_driver > 0.
>
> Signed-off-by: Kemeng Shi <shikemeng@huaweicloud.com>
I have nothing against this but OTOH in this complex condition the original
version looks more readable than the new one to me.
Honza
> ---
> block/bfq-iosched.c | 3 +--
> 1 file changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/block/bfq-iosched.c b/block/bfq-iosched.c
> index ebcafe3c4c3b..7c91d16dbf6f 100644
> --- a/block/bfq-iosched.c
> +++ b/block/bfq-iosched.c
> @@ -2204,8 +2204,7 @@ static void bfq_add_request(struct request *rq)
> */
> if (bfqq == bfqd->in_service_queue &&
> (bfqd->rq_in_driver == 0 ||
> - (bfqq->last_serv_time_ns > 0 &&
> - bfqd->rqs_injected && bfqd->rq_in_driver > 0)) &&
> + (bfqq->last_serv_time_ns > 0 && bfqd->rqs_injected)) &&
> time_is_before_eq_jiffies(bfqq->decrease_time_jif +
> msecs_to_jiffies(10))) {
> bfqd->last_empty_occupied_ns = ktime_get_ns();
> --
> 2.30.0
>
--
Jan Kara <jack@suse.com>
SUSE Labs, CR
next prev parent reply other threads:[~2023-01-02 15:54 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-12-22 19:16 [PATCH RESEND v2 00/10] A few bugfix and cleancode patch for bfq Kemeng Shi
2022-12-22 19:16 ` [PATCH RESEND v2 01/10] block, bfq: correctly raise inject limit in bfq_choose_bfqq_for_injection Kemeng Shi
2023-01-02 15:13 ` Jan Kara
2022-12-22 19:16 ` [PATCH RESEND v2 02/10] block, bfq: remove unsed parameter reason in bfq_bfqq_is_slow Kemeng Shi
2023-01-02 15:14 ` Jan Kara
2022-12-22 19:16 ` [PATCH RESEND v2 03/10] block, bfq: initialize bfqq->decrease_time_jif correctly Kemeng Shi
2023-01-02 15:30 ` Jan Kara
2022-12-22 19:16 ` [PATCH RESEND v2 04/10] block, bfq: use helper macro RQ_BFQQ to get bfqq of request Kemeng Shi
2023-01-02 15:31 ` Jan Kara
2022-12-22 19:16 ` [PATCH RESEND v2 05/10] block, bfq: remove unnecessary dereference to get async_bfqq Kemeng Shi
2023-01-02 15:34 ` Jan Kara
2022-12-22 19:16 ` [PATCH RESEND v2 06/10] block, bfq: remove redundant bfqd->rq_in_driver > 0 check in bfq_add_request Kemeng Shi
2023-01-02 15:54 ` Jan Kara [this message]
2022-12-22 19:16 ` [PATCH RESEND v2 07/10] block, bfq: remove redundant check in bfq_put_cooperator Kemeng Shi
2023-01-02 15:57 ` Jan Kara
2022-12-22 19:16 ` [PATCH RESEND v2 08/10] block, bfq: remove unnecessary goto tag in bfq_dispatch_rq_from_bfqq Kemeng Shi
2023-01-02 15:59 ` Jan Kara
2022-12-22 19:16 ` [PATCH RESEND v2 09/10] block, bfq: remove unused bfq_wr_max_time in struct bfq_data Kemeng Shi
2023-01-02 16:00 ` Jan Kara
2022-12-22 19:16 ` [PATCH RESEND v2 10/10] block, bfq: remove check of bfq_wr_max_softrt_rate which is always greater than 0 Kemeng Shi
2023-01-02 16:05 ` Jan Kara
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