linux-kernel - Re: [PATCH 1/3] mm/vmscan: make inactive_anon_is_low

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Message-ID: <20150921161806.GE19811@dhcp22.suse.cz>
Date:	Mon, 21 Sep 2015 18:18:07 +0200
From:	Michal Hocko <mhocko@...nel.org>
To:	Yaowei Bai <bywxiaobai@....com>
Cc:	akpm@...ux-foundation.org, mgorman@...e.de, rientjes@...gle.com,
	hannes@...xchg.org, vdavydov@...allels.com, oleg@...hat.com,
	vbabka@...e.cz, iamjoonsoo.kim@....com, zhangyanfei@...fujitsu.com,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] mm/vmscan: make inactive_anon_is_low_global return
 directly

On Wed 16-09-15 19:59:58, Yaowei Bai wrote:
> Delete unnecessary if to let inactive_anon_is_low_global return
> directly.
> 
> No functional changes.

Is this really an improvement? I am not so sure. If anything the
function has a bool return semantic...

> Signed-off-by: Yaowei Bai <bywxiaobai@....com>
> ---
>  mm/vmscan.c | 5 +----
>  1 file changed, 1 insertion(+), 4 deletions(-)
> 
> diff --git a/mm/vmscan.c b/mm/vmscan.c
> index 2d978b2..2785d8e 100644
> --- a/mm/vmscan.c
> +++ b/mm/vmscan.c
> @@ -1866,10 +1866,7 @@ static int inactive_anon_is_low_global(struct zone *zone)
>  	active = zone_page_state(zone, NR_ACTIVE_ANON);
>  	inactive = zone_page_state(zone, NR_INACTIVE_ANON);
>  
> -	if (inactive * zone->inactive_ratio < active)
> -		return 1;
> -
> -	return 0;
> +	return inactive * zone->inactive_ratio < active;
>  }
>  
>  /**
> -- 
> 1.9.1
> 
> 
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-- 
Michal Hocko
SUSE Labs
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