linux-kernel - [PATCH 7/7] mm: page_alloc: Default allow file pages to use remote nodes for fair allocation policy

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Date:	Fri, 13 Dec 2013 14:10:07 +0000
From:	Mel Gorman <mgorman@...e.de>
To:	Johannes Weiner <hannes@...xchg.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Dave Hansen <dave.hansen@...el.com>,
	Rik van Riel <riel@...hat.com>,
	Linux-MM <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>, Mel Gorman <mgorman@...e.de>
Subject: [PATCH 7/7] mm: page_alloc: Default allow file pages to use remote nodes for fair allocation policy

Indications from Johannes that he wanted this. Needs some data and/or justification why
thrash protection needs it plus docs describing how MPOL_LOCAL is now different before
it should be considered finished. I do not necessarily agree this patch is necessary
but it's worth punting it out there for discussion and testing.

Not signed off
---
 mm/page_alloc.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index bf49918..bce40c0 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -1885,7 +1885,8 @@ unsigned __bitwise__ zone_distribute_mode __read_mostly;
 #define DISTRIBUTE_STUPID_ANON	(DISTRIBUTE_LOCAL_ANON|DISTRIBUTE_REMOTE_ANON)
 #define DISTRIBUTE_STUPID_FILE	(DISTRIBUTE_LOCAL_FILE|DISTRIBUTE_REMOTE_FILE)
 #define DISTRIBUTE_STUPID_SLAB	(DISTRIBUTE_LOCAL_SLAB|DISTRIBUTE_REMOTE_SLAB)
-#define DISTRIBUTE_DEFAULT	(DISTRIBUTE_LOCAL_ANON|DISTRIBUTE_LOCAL_FILE|DISTRIBUTE_LOCAL_SLAB)
+#define DISTRIBUTE_DEFAULT	(DISTRIBUTE_LOCAL_ANON|DISTRIBUTE_LOCAL_FILE|DISTRIBUTE_LOCAL_SLAB| \
+				 DISTRIBUTE_REMOTE_FILE)
 
 /* Only these GFP flags are affected by the fair zone allocation policy */
 #define DISTRIBUTE_GFP_MASK	((GFP_MOVABLE_MASK|__GFP_PAGECACHE))
-- 
1.8.4

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