linux-kernel - [PATCH] mm/vmscan: cleanup on the comments of do_try_to_free

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Message-Id: <1339723524-6332-1-git-send-email-liwp.linux@gmail.com>
Date:	Fri, 15 Jun 2012 09:25:24 +0800
From:	Wanpeng Li <liwp.linux@...il.com>
To:	linux-mm@...ck.org
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Mel Gorman <mgorman@...e.de>, Minchan Kim <minchan@...nel.org>,
	Hugh Dickins <hughd@...gle.com>, linux-kernel@...r.kernel.org,
	trivial@...nel.org, Gavin Shan <shangw@...ux.vnet.ibm.com>,
	Wanpeng Li <liwp.linux@...il.com>
Subject: [PATCH] mm/vmscan: cleanup on the comments of do_try_to_free_pages

From: Wanpeng Li <liwp@...ux.vnet.ibm.com>

Since lumpy reclaim algorithm is removed by Mel Gorman, cleanup the
footprint of lumpy reclaim.

Signed-off-by: Wanpeng Li <liwp.linux@...il.com>
---
 mm/vmscan.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/mm/vmscan.c b/mm/vmscan.c
index 603c96f..2fc16cf 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -2065,8 +2065,9 @@ static unsigned long do_try_to_free_pages(struct zonelist *zonelist,
 		 * Try to write back as many pages as we just scanned.  This
 		 * tends to cause slow streaming writers to write data to the
 		 * disk smoothly, at the dirtying rate, which is nice.   But
-		 * that's undesirable in laptop mode, where we *want* lumpy
-		 * writeout.  So in laptop mode, write out the whole world.
+		 * that's undesirable in laptop mode, where as much I/O as
+		 * possible should be trigged if the disk needs to be spun up.
+		 * So in laptop mode, write out the whole world.
 		 */
 		writeback_threshold = sc->nr_to_reclaim + sc->nr_to_reclaim / 2;
 		if (total_scanned > writeback_threshold) {
-- 
1.7.9.5

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