linux-kernel - [PATCH 4/4] zswap: avoid unnecessary page scanning

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Message-ID: <CAL1ERfMc-KUEvF-vdWvPgQ+igW29fpRrS4oPwoz_DdGRzsGwtw@mail.gmail.com>
Date:	Fri, 23 Aug 2013 19:14:06 +0800
From:	Weijie Yang <weijie.yang.kh@...il.com>
To:	Minchan Kim <minchan@...nel.org>, Bob Liu <bob.liu@...cle.com>,
	sjenning@...ux.vnet.ibm.com
Cc:	weijie.yang@...sung.com, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 4/4] zswap: avoid unnecessary page scanning

add SetPageReclaim before __swap_writepage, so that page can be moved
to the tail of the inactive list,
which will avoid unnecessary page scanning as this page was reclaimed
by swap subsystem before.

---
 mm/zswap.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/mm/zswap.c b/mm/zswap.c
index 9d34c3c..67a2e38 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);
-- 
1.7.0.4
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