linux-kernel - Re: [PATCH] mmtom: Prevent shrinking of active anon lru list in case of no swap space V2

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Message-Id: <20090514204033.9B87.A69D9226@jp.fujitsu.com>
Date:	Thu, 14 May 2009 20:44:03 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc:	kosaki.motohiro@...fujitsu.com,
	Minchan Kim <minchan.kim@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>,
	Johannes Weiner <hannes@...xchg.org>,
	Rik van Riel <riel@...hat.com>
Subject: Re: [PATCH] mmtom: Prevent shrinking of active anon lru list in case of no swap space V2

> > 
> > Changelog since V2
> >  o Add new function - can_reclaim_anon : it tests anon_list can be reclaim 
> > 
> > Changelog since V1 
> >  o Use nr_swap_pages <= 0 in shrink_active_list to prevent scanning  of active anon list.
> > 
> > Now shrink_active_list is called several places.
> > But if we don't have a swap space, we can't reclaim anon pages.
> > So, we don't need deactivating anon pages in anon lru list.
> > 
> > Signed-off-by: Minchan Kim <minchan.kim@...il.com>
> > Cc: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
> > Cc: Johannes Weiner <hannes@...xchg.org>
> > Cc: Rik van Riel <riel@...hat.com>	
> 
> looks good to me. thanks :)

Grr, my fault.



>  static unsigned long shrink_list(enum lru_list lru, unsigned long nr_to_scan,
>  	struct zone *zone, struct scan_control *sc, int priority)
>  {
> @@ -1399,7 +1412,7 @@ static unsigned long shrink_list(enum lru_list lru, unsigned long nr_to_scan,
>  		return 0;
>  	}
>  
> -	if (lru == LRU_ACTIVE_ANON && inactive_anon_is_low(zone, sc)) {
> +	if (lru == LRU_ACTIVE_ANON && can_reclaim_anon(zone, sc)) {
>  		shrink_active_list(nr_to_scan, zone, sc, priority, file);
>  		return 0;

you shouldn't do that. if nr_swap_pages==0, get_scan_ratio return anon=0%.
then, this branch is unnecessary.




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