From: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx> 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/1594622517-20681-1-git-send-email-iamjoonsoo.kim@xxxxxxx Link: http://lkml.kernel.org/r/1594622517-20681-2-git-send-email-iamjoonsoo.kim@xxxxxxx Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx> Acked-by: Roman Gushchin <guro@xxxxxx> Acked-by: Michal Hocko <mhocko@xxxxxxxx> Reviewed-by: Vlastimil Babka <vbabka@xxxxxxx> Cc: Christoph Hellwig <hch@xxxxxxxxxxxxx> Cc: Mike Kravetz <mike.kravetz@xxxxxxxxxx> Cc: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- mm/page_isolation.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) --- 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]); } _
