linux-kernel - [PATCH 3/8] Preserve local node for KSM copies

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Date:	Mon, 21 Feb 2011 11:07:45 -0800
From:	Andi Kleen <andi@...stfloor.org>
To:	akpm@...ux-foundation.org
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	aarcange@...hat.com, lwoodman@...hat.com,
	Andi Kleen <ak@...ux.intel.com>, arcange@...hat.com
Subject: [PATCH 3/8] Preserve local node for KSM copies

From: Andi Kleen <ak@...ux.intel.com>

Add a alloc_page_vma_node that allows passing the "local" node in.
Use it in ksm to allocate copy pages on the same node as
the original as possible.

Cc: arcange@...hat.com
Signed-off-by: Andi Kleen <ak@...ux.intel.com>
---
 include/linux/gfp.h |    2 ++
 mm/ksm.c            |    3 ++-
 2 files changed, 4 insertions(+), 1 deletions(-)

diff --git a/include/linux/gfp.h b/include/linux/gfp.h
index 782e74a..814d50e 100644
--- a/include/linux/gfp.h
+++ b/include/linux/gfp.h
@@ -343,6 +343,8 @@ extern struct page *alloc_pages_vma(gfp_t gfp_mask, int order,
 #define alloc_page(gfp_mask) alloc_pages(gfp_mask, 0)
 #define alloc_page_vma(gfp_mask, vma, addr)			\
 	alloc_pages_vma(gfp_mask, 0, vma, addr, numa_node_id())
+#define alloc_page_vma_node(gfp_mask, vma, addr, node)		\
+	alloc_pages_vma(gfp_mask, 0, vma, addr, node)
 
 extern unsigned long __get_free_pages(gfp_t gfp_mask, unsigned int order);
 extern unsigned long get_zeroed_page(gfp_t gfp_mask);
diff --git a/mm/ksm.c b/mm/ksm.c
index c2b2a94..fc83335 100644
--- a/mm/ksm.c
+++ b/mm/ksm.c
@@ -1575,7 +1575,8 @@ struct page *ksm_does_need_to_copy(struct page *page,
 {
 	struct page *new_page;
 
-	new_page = alloc_page_vma(GFP_HIGHUSER_MOVABLE, vma, address);
+	new_page = alloc_page_vma_node(GFP_HIGHUSER_MOVABLE, vma, address,
+				       page_to_nid(page));
 	if (new_page) {
 		copy_user_highpage(new_page, page, address, vma);
 
-- 
1.7.4

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