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

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Date:	Mon, 18 May 2009 11:40:53 +0900
From:	Minchan Kim <minchan.kim@...il.com>
To:	Wu Fengguang <fengguang.wu@...el.com>
Cc:	MinChan Kim <minchan.kim@...il.com>,
	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>,
	Rik van Riel <riel@...hat.com>
Subject: Re: [PATCH] mmtom: Prevent shrinking of active anon lru list in
 case of no swap space V3

On Mon, 18 May 2009 10:34:04 +0800
Wu Fengguang <fengguang.wu@...el.com> wrote:

> On Thu, May 14, 2009 at 11:15:55PM +0900, MinChan Kim wrote:
>  
> > diff --git a/mm/vmscan.c b/mm/vmscan.c
> > index 2f9d555..621708f 100644
> > --- 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);
> 
> There's another "if (inactive_anon_is_low) shrink_active_list;"
> occurrence to be fixed in balance_pgdat()? Otherwise:

I add Rik's comment. Of course, I agree his opinion. 

"If we are close to running out of swap space, with
swapins freeing up swap space on a regular basis,
I believe we do want to do aging on the active
pages, just so we can pick a decent page to swap
out next time swap space becomes available."

> Acked-by: Wu Fengguang <fengguang.wu@...el.com>

Thanks for spending your time for my patch. Wu Fengguang :)

-- 
Kinds Regards
Minchan Kim
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