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Subject[PATCH v2 01/12] mm/page_isolation: prefer the node of the source page
Date
From: Joonsoo Kim <iamjoonsoo.kim@lge.com>

For locality, it's better to migrate the page to the same node
rather than the node of the current caller's cpu.

Acked-by: Roman Gushchin <guro@fb.com>
Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>
---
mm/page_isolation.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/mm/page_isolation.c b/mm/page_isolation.c
index 2c11a38..7df89bd 100644
--- a/mm/page_isolation.c
+++ b/mm/page_isolation.c
@@ -300,5 +300,7 @@ int test_pages_isolated(unsigned long start_pfn, unsigned long end_pfn,

struct page *alloc_migrate_target(struct page *page, unsigned long private)
{
- return new_page_nodemask(page, numa_node_id(), &node_states[N_MEMORY]);
+ int nid = page_to_nid(page);
+
+ return new_page_nodemask(page, nid, &node_states[N_MEMORY]);
}
--
2.7.4
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