linux-kernel - Re: [PATCH] mmtom: Prevent shrinking of active anon lru list in case of no swap space V3

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Message-ID: <4A0C37D0.60004@redhat.com>
Date:	Thu, 14 May 2009 11:25:04 -0400
From:	Rik van Riel <riel@...hat.com>
To:	MinChan Kim <minchan.kim@...il.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Johannes Weiner <hannes@...xchg.org>
Subject: Re: [PATCH] mmtom: Prevent shrinking of active anon lru list in case
 of no swap space V3

MinChan Kim wrote:

> This patch prevents unnecessary deactivation of anon lru pages.
> But, it don't prevent aging of anon pages to swap out.

> --- a/mm/vmscan.c
> +++ b/mm/vmscan.c
> @@ -1577,7 +1577,7 @@ static void shrink_zone(int priority, struct zone *zone,
>  	 * Even if we did not try to evict anon pages at all, we want to
>  	 * rebalance the anon lru active/inactive ratio.
>  	 */
> -	if (inactive_anon_is_low(zone, sc))
> +	if (inactive_anon_is_low(zone, sc) && nr_swap_pages > 0)
>  		shrink_active_list(SWAP_CLUSTER_MAX, zone, sc, priority, 0);
>  
>  	throttle_vm_writeout(sc->gfp_mask);

Acked-by: Rik van Riel <riel@...hat.com>
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