linux-kernel - Re: [PATCH] vmscan: prevent background aging of anon page in no swap system

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Date:	Sun, 29 Aug 2010 14:23:31 -0700
From:	Ying Han <yinghan@...gle.com>
To:	Rik van Riel <riel@...hat.com>
Cc:	Minchan Kim <minchan.kim@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-mm <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Venkatesh Pallipadi <venki@...gle.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Johannes Weiner <hannes@...xchg.org>
Subject: Re: [PATCH] vmscan: prevent background aging of anon page in no swap system

On Sun, Aug 29, 2010 at 1:03 PM, Rik van Riel <riel@...hat.com> wrote:
> On 08/29/2010 01:45 PM, Ying Han wrote:
>
>> There are few other places in vmscan where we check nr_swap_pages and
>> inactive_anon_is_low. Are we planning to change them to use
>> total_swap_pages
>> to be consistent ?
>
> If that makes sense, maybe the check can just be moved into
> inactive_anon_is_low itself?

That was the initial patch posted, instead we changed to use
total_swap_pages instead. How this patch looks:

@@ -1605,6 +1605,9 @@ static int inactive_anon_is_low(struct zone
*zone, struct scan_control *sc)
 {
        int low;

+       if (total_swap_pages <= 0)
+               return 0;
+
        if (scanning_global_lru(sc))
                low = inactive_anon_is_low_global(zone);
        else
@@ -1856,7 +1859,7 @@ 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) && nr_swap_pages > 0)
+       if (inactive_anon_is_low(zone, sc))
                shrink_active_list(SWAP_CLUSTER_MAX, zone, sc, priority, 0);

        throttle_vm_writeout(sc->gfp_mask);

--Ying

>
> --
> All rights reversed
>
--
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