linux-kernel - Re: [PATCH] lib/flex_proportions.c: aging counts when fraction smaller than max_frac/FPROP_FRAC

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Date:   Thu, 7 May 2020 16:46:14 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Tan Hu <tan.hu@....com.cn>
Cc:     linux-kernel@...r.kernel.org, xue.zhihong@....com.cn,
        wang.yi59@....com.cn, wang.liang82@....com.cn,
        Jan Kara <jack@...e.cz>
Subject: Re: [PATCH] lib/flex_proportions.c: aging counts when fraction
 smaller than max_frac/FPROP_FRAC_BASE

On Wed, 6 May 2020 14:21:28 +0800 Tan Hu <tan.hu@....com.cn> wrote:

> If the given type has fraction smaller than max_frac/FPROP_FRAC_BASE,
> __fprop_inc_percpu_max should follow the design formula and aging
> fraction too.
> 
> Signed-off-by: Tan Hu <tan.hu@....com.cn>
> ---
>  lib/flex_proportions.c | 7 +++----
>  1 file changed, 3 insertions(+), 4 deletions(-)
> 
> diff --git a/lib/flex_proportions.c b/lib/flex_proportions.c
> index 7852bfff5..451543937 100644
> --- a/lib/flex_proportions.c
> +++ b/lib/flex_proportions.c
> @@ -266,8 +266,7 @@ void __fprop_inc_percpu_max(struct fprop_global *p,
>  		if (numerator >
>  		    (((u64)denominator) * max_frac) >> FPROP_FRAC_SHIFT)
>  			return;
> -	} else
> -		fprop_reflect_period_percpu(p, pl);
> -	percpu_counter_add_batch(&pl->events, 1, PROP_BATCH);
> -	percpu_counter_add(&p->events, 1);
> +	}
> +
> +	__fprop_inc_percpu(p, pl);
>  }

(Cc Jan)