From: Weijie Yang <weijie.yang@samsung.com>
To: akpm@linux-foundation.org
Cc: sjenning@linux.vnet.ibm.com, bob.liu@oracle.com, minchan@kernel.org,
        weijie.yang.kh@gmail.com, linux-mm@kvack.org,
        linux-kernel@vger.kernel.org, stable@vger.kernel.org,
        d.j.shin@samsung.com, heesub.shin@samsung.com,
        kyungmin.park@samsung.com, hau.chen@samsung.com,
        bifeng.tong@samsung.com, rui.xie@samsung.com
Subject: [PATCH v3 3/3] mm/zswap: avoid unnecessary page scanning
Date: Mon, 23 Sep 2013 16:21:49 +0800
Message-id: <000101ceb836$1a4c0ee0$4ee42ca0$%yang@samsung.com>
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add SetPageReclaim before __swap_writepage so that page can be moved to the
tail of the inactive list, which can avoid unnecessary page scanning as this
page was reclaimed by swap subsystem before.

Signed-off-by: Weijie Yang <weijie.yang@samsung.com>
Reviewed-by: Bob Liu <bob.liu@oracle.com>
Cc: Minchan Kim <minchan@kernel.org>
Cc: stable@vger.kernel.org
Acked-by: Seth Jennings <sjenning@linux.vnet.ibm.com>
---
 mm/zswap.c |    3 +++
 1 file changed, 3 insertions(+)

diff --git a/mm/zswap.c b/mm/zswap.c
index 1be7b90..cc40e6a 100644
--- a/mm/zswap.c
+++ b/mm/zswap.c
@@ -556,6 +556,9 @@ static int zswap_writeback_entry(struct zbud_pool *pool, unsigned long handle)
 		SetPageUptodate(page);
 	}
 
+	/* move it to the tail of the inactive list after end_writeback */
+	SetPageReclaim(page);
+
 	/* start writeback */
 	__swap_writepage(page, &wbc, end_swap_bio_write);
 	page_cache_release(page);
-- 
1.7.10.4


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