linux-kernel - [PATCH 4/4] mm: move most file-based accounting to the node -fix

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Message-Id: <1468404004-5085-5-git-send-email-mgorman@techsingularity.net>
Date:	Wed, 13 Jul 2016 11:00:04 +0100
From:	Mel Gorman <mgorman@...hsingularity.net>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Linux-MM <linux-mm@...ck.org>
Cc:	Johannes Weiner <hannes@...xchg.org>,
	Minchan Kim <minchan@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Mel Gorman <mgorman@...hsingularity.net>
Subject: [PATCH 4/4] mm: move most file-based accounting to the node -fix

As noted by Johannes Weiner, NR_ZONE_WRITE_PENDING gets decremented twice
during migration instead of a dec(old) -> inc(new) cycle as intended.

This is a fix to mmotm patch
mm-move-most-file-based-accounting-to-the-node.patch

Note that it'll cause a conflict with
mm-vmstat-remove-zone-and-node-double-accounting-by-approximating-retries.patch
but that the resolution is trivial.

Signed-off-by: Mel Gorman <mgorman@...hsingularity.net>
---
 mm/migrate.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/migrate.c b/mm/migrate.c
index c77997dc6ed7..ed0268268e93 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -515,7 +515,7 @@ int migrate_page_move_mapping(struct address_space *mapping,
 			__dec_node_state(oldzone->zone_pgdat, NR_FILE_DIRTY);
 			__dec_zone_state(oldzone, NR_ZONE_WRITE_PENDING);
 			__inc_node_state(newzone->zone_pgdat, NR_FILE_DIRTY);
-			__dec_zone_state(newzone, NR_ZONE_WRITE_PENDING);
+			__inc_zone_state(newzone, NR_ZONE_WRITE_PENDING);
 		}
 	}
 	local_irq_enable();
-- 
2.6.4