[131/165] mm/page_isolation: prefer the node of the source page

Commit Message

Andrew Morton Aug. 12, 2020, 1:37 a.m. UTC

From: Joonsoo Kim <[e-mail]>
Subject: mm/page_isolation: prefer the node of the source page

Patch series "clean-up the migration target allocation functions", v5.


This patch (of 9):

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

Link: http://lkml.kernel.org/r/[e-mail]
Link: http://lkml.kernel.org/r/[e-mail]
Signed-off-by: Joonsoo Kim <[e-mail]>
Acked-by: Roman Gushchin <[e-mail]>
Acked-by: Michal Hocko <[e-mail]>
Reviewed-by: Vlastimil Babka <[e-mail]>
Cc: Christoph Hellwig <[e-mail]>
Cc: Mike Kravetz <[e-mail]>
Cc: Naoya Horiguchi <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
---

 mm/page_isolation.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

Patch

--- a/mm/page_isolation.c~mm-page_isolation-prefer-the-node-of-the-source-page
+++ a/mm/page_isolation.c
@@ -309,5 +309,7 @@  int test_pages_isolated(unsigned long st
 
 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]);
 }