linux-kernel - [PATCH 3/7] mm: check if we isolated a compound page during lumpy scan

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Message-Id: <1321900608-27687-4-git-send-email-mgorman@suse.de>
Date:	Mon, 21 Nov 2011 18:36:44 +0000
From:	Mel Gorman <mgorman@...e.de>
To:	Linux-MM <linux-mm@...ck.org>
Cc:	Andrea Arcangeli <aarcange@...hat.com>,
	Minchan Kim <minchan.kim@...il.com>, Jan Kara <jack@...e.cz>,
	Andy Isaacson <adi@...apodia.org>,
	Johannes Weiner <jweiner@...hat.com>,
	Mel Gorman <mgorman@...e.de>, Rik van Riel <riel@...hat.com>,
	Nai Xia <nai.xia@...il.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH 3/7] mm: check if we isolated a compound page during lumpy scan

From: Andrea Arcangeli <aarcange@...hat.com>

Properly take into account if we isolated a compound page during the
lumpy scan in reclaim and skip over the tail pages when encounted.
This corrects the values given to the tracepoint for number of lumpy
pages isolated and will avoid breaking the loop early if compound
pages smaller than the requested allocation size are requested.

[mgorman@...e.de: Updated changelog]
Signed-off-by: Andrea Arcangeli <aarcange@...hat.com>
Signed-off-by: Mel Gorman <mgorman@...e.de>
---
 mm/vmscan.c |    9 ++++++---
 1 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/mm/vmscan.c b/mm/vmscan.c
index a1893c0..3421746 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1183,13 +1183,16 @@ static unsigned long isolate_lru_pages(unsigned long nr_to_scan,
 				break;
 
 			if (__isolate_lru_page(cursor_page, mode, file) == 0) {
+				unsigned int isolated_pages;
 				list_move(&cursor_page->lru, dst);
 				mem_cgroup_del_lru(cursor_page);
-				nr_taken += hpage_nr_pages(page);
-				nr_lumpy_taken++;
+				isolated_pages = hpage_nr_pages(page);
+				nr_taken += isolated_pages;
+				nr_lumpy_taken += isolated_pages;
 				if (PageDirty(cursor_page))
-					nr_lumpy_dirty++;
+					nr_lumpy_dirty += isolated_pages;
 				scan++;
+				pfn += isolated_pages-1;
 			} else {
 				/*
 				 * Check if the page is freed already.
-- 
1.7.3.4

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