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

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Date:	Thu, 14 May 2009 14:10:25 +0900
From:	Minchan Kim <minchan.kim@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>
Cc:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Rik van Riel <riel@...hat.com>
Subject: [PATCH] Prevent shrinking of active anon lru list in case of no
 swap space


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>
---
 mm/vmscan.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/mm/vmscan.c b/mm/vmscan.c
index 2f9d555..e4d71f4 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1238,6 +1238,12 @@ static void shrink_active_list(unsigned long nr_pages, struct zone *zone,
 	enum lru_list lru;
 	struct zone_reclaim_stat *reclaim_stat = get_reclaim_stat(zone, sc);
 
+	/* 
+	 * we can't shrink anon list in case of no swap space.
+	 */
+	if (file == 0 && nr_swap_pages <= 0)
+		return;
+
 	lru_add_drain();
 	spin_lock_irq(&zone->lru_lock);
 	pgmoved = sc->isolate_pages(nr_pages, &l_hold, &pgscanned, sc->order,
-- 
1.5.4.3


-- 
Kinds Regards
Minchan Kim
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