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Message-Id: <dc54a5771cf1f580a91d16816100d4a2bcf2cdf5.1304261567.git.minchan.kim@gmail.com>
Date: Mon, 2 May 2011 00:03:31 +0900
From: Minchan Kim <minchan.kim@...il.com>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: linux-mm <linux-mm@...ck.org>, LKML <linux-kernel@...r.kernel.org>,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
Johannes Weiner <hannes@...xchg.org>,
Rik van Riel <riel@...hat.com>,
KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
Mel Gorman <mgorman@...e.de>, Ying Han <yinghan@...gle.com>,
Minchan Kim <minchan.kim@...il.com>
Subject: [PATCH 2/2] Filter unevictable page out in deactivate_page
It's pointless that deactive_page's pagevec operation about
unevictable page as it's nop.
This patch removes unnecessary overhead which might be a bit problem
in case that there are many unevictable page in system(ex, mprotect workload)
Signed-off-by: Minchan Kim <minchan.kim@...il.com>
---
mm/swap.c | 9 +++++++++
1 files changed, 9 insertions(+), 0 deletions(-)
diff --git a/mm/swap.c b/mm/swap.c
index 2e9656d..b707694 100644
--- a/mm/swap.c
+++ b/mm/swap.c
@@ -511,6 +511,15 @@ static void drain_cpu_pagevecs(int cpu)
*/
void deactivate_page(struct page *page)
{
+
+ /*
+ * In workload which system has many unevictable page(ex, mprotect),
+ * unevictalge page deactivation for accelerating reclaim
+ * is pointless.
+ */
+ if (PageUnevictable(page))
+ return;
+
if (likely(get_page_unless_zero(page))) {
struct pagevec *pvec = &get_cpu_var(lru_deactivate_pvecs);
--
1.7.1
--
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