linux-kernel - [PATCH 1/4] mm/writeback: correct dirty page calculation for highmem

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Date:	Fri,  1 Apr 2016 11:10:07 +0900
From:	js1304@...il.com
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Rik van Riel <riel@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Mel Gorman <mgorman@...e.de>,
	Laura Abbott <lauraa@...eaurora.org>,
	Minchan Kim <minchan@...nel.org>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Michal Nazarewicz <mina86@...a86.com>,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	Vlastimil Babka <vbabka@...e.cz>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, Joonsoo Kim <iamjoonsoo.kim@....com>
Subject: [PATCH 1/4] mm/writeback: correct dirty page calculation for highmem

From: Joonsoo Kim <iamjoonsoo.kim@....com>

ZONE_MOVABLE could be treated as highmem so we need to consider it for
accurate calculation of dirty pages. And, in following patches, ZONE_CMA
will be introduced and it can be treated as highmem, too. So, instead of
manually adding stat of ZONE_MOVABLE, looping all zones and check whether
the zone is highmem or not and add stat of the zone which can be treated
as highmem.

Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@....com>
---
 mm/page-writeback.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index 11ff8f7..6a72809 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -296,11 +296,15 @@ static unsigned long highmem_dirtyable_memory(unsigned long total)
 #ifdef CONFIG_HIGHMEM
 	int node;
 	unsigned long x = 0;
+	int i;
 
 	for_each_node_state(node, N_HIGH_MEMORY) {
-		struct zone *z = &NODE_DATA(node)->node_zones[ZONE_HIGHMEM];
+		for (i = 0; i < MAX_NR_ZONES; i++) {
+			struct zone *z = &NODE_DATA(node)->node_zones[i];
 
-		x += zone_dirtyable_memory(z);
+			if (is_highmem(z))
+				x += zone_dirtyable_memory(z);
+		}
 	}
 	/*
 	 * Unreclaimable memory (kernel memory or anonymous memory
-- 
1.9.1