linux-kernel - [RFC 5/6] mm: reclaim lazyfree pages in swapless system

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Date:	Fri, 14 Mar 2014 15:37:49 +0900
From:	Minchan Kim <minchan@...nel.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Rik van Riel <riel@...hat.com>, Mel Gorman <mgorman@...e.de>,
	Hugh Dickins <hughd@...gle.com>,
	Dave Hansen <dave.hansen@...el.com>,
	Johannes Weiner <hannes@...xchg.org>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	John Stultz <john.stultz@...aro.org>, Jason Evans <je@...com>,
	Minchan Kim <minchan@...nel.org>
Subject: [RFC 5/6] mm: reclaim lazyfree pages in swapless system

If there are lazyfree pages in system, shrink inactive anonymous
LRU to discard lazyfree pages regardless of existing avaialable
swap.

Signed-off-by: Minchan Kim <minchan@...nel.org>
---
 mm/vmscan.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/mm/vmscan.c b/mm/vmscan.c
index 98a1c3ffcaab..ad73e053c581 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1889,8 +1889,13 @@ static void get_scan_count(struct lruvec *lruvec, struct scan_control *sc,
 	if (!global_reclaim(sc))
 		force_scan = true;
 
-	/* If we have no swap space, do not bother scanning anon pages. */
-	if (!sc->may_swap || (get_nr_swap_pages() <= 0)) {
+	/*
+	 * If we have no swap space and lazyfree pages,
+	 * do not bother scanning anon pages.
+	 */
+	if (!sc->may_swap ||
+		(get_nr_swap_pages() <= 0 &&
+			zone_page_state(zone, NR_LAZYFREE_PAGES) <= 0)) {
 		scan_balance = SCAN_FILE;
 		goto out;
 	}
-- 
1.9.0

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