linux-kernel - Re: [PATCH]vmscan: handle underflow for get_scan

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Date:	Tue, 30 Mar 2010 19:25:29 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Minchan Kim <minchan.kim@...il.com>
Cc:	kosaki.motohiro@...fujitsu.com, Shaohua Li <shaohua.li@...el.com>,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	akpm@...ux-foundation.org, fengguang.wu@...el.com
Subject: Re: [PATCH]vmscan: handle underflow for get_scan_ratio

> Yes. It made subtle change.
> But we should not depend that change.
> Current logic seems to be good and clear than old.
> I think you were lucky at that time by not-good and not-clear logic.
> 
> BTW, How about this?

Unfortunatelly, memcg need your removed code. if removed, swapping out
might happen although sc->may_swap==0 when priority==0.

Please give me little investigate time.



> diff --git a/mm/vmscan.c b/mm/vmscan.c
> index 79c8098..f0df563 100644
> --- a/mm/vmscan.c
> +++ b/mm/vmscan.c
> @@ -1646,11 +1646,6 @@ static void shrink_zone(int priority, struct zone *zone,
>                 int file = is_file_lru(l);
>                 unsigned long scan;
> 
> -               if (percent[file] == 0) {
> -                       nr[l] = 0;
> -                       continue;
> -               }
> -
>                 scan = zone_nr_lru_pages(zone, sc, l);
>                 if (priority) {
>                         scan >>= priority;
> 
> 
> 
> 
> -- 
> Kind regards,
> Minchan Kim
> 
> --
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