linux-kernel - Re: [PATCH] block/bfq: the delta_from

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Message-Id: <C5E7C12D-616A-40BD-8BFF-2D7C0211B8C9@linaro.org>
Date:   Wed, 21 Jul 2021 09:56:12 +0200
From:   Paolo Valente <paolo.valente@...aro.org>
To:     liubaozhu <liubaozhu@...ontech.com>
Cc:     axboe@...nel.dk, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] block/bfq: the delta_from_first should be ns rather than
 us

[RESENDING ...]

> Il giorno 21 lug 2021, alle ore 08:30, liubaozhu <liubaozhu@...ontech.com> ha scritto:
> 
> In the block/bfq-iosched.c,the function bfq_update_peak_rate(),
> bfqd->delta_from_first = now_ns - bfqd->first_dispatch,
> according to the subtraction operation here,now_ns is ns,
> and bfqd->first_dispatch is also ns,so bfqd->delta_from_first should be ns.
> 

Correct!

Acked-by: Paolo Valente <paolo.valente@...aro.org>

Thank you,
Paolo

> Signed-off-by: liubaozhu <liubaozhu@...ontech.com>
> ---
> block/bfq-iosched.h | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/block/bfq-iosched.h b/block/bfq-iosched.h
> index 99c2a3cb0..7cf4fc8c3 100644
> --- a/block/bfq-iosched.h
> +++ b/block/bfq-iosched.h
> @@ -632,7 +632,7 @@ struct bfq_data {
> 	u64 tot_sectors_dispatched;
> 	/* max rq size seen during current observation interval (sectors) */
> 	u32 last_rq_max_size;
> -	/* time elapsed from first dispatch in current observ. interval (us) */
> +	/* time elapsed from first dispatch in current observ. interval (ns) */
> 	u64 delta_from_first;
> 	/*
> 	 * Current estimate of the device peak rate, measured in
> -- 
> 2.20.1
> 
> 
>