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From:   js1304@gmail.com
To:     Andrew Morton <akpm@linux-foundation.org>
Cc:     linux-mm@kvack.org, linux-kernel@vger.kernel.org,
        kernel-team@lge.com, Vlastimil Babka <vbabka@suse.cz>,
        Christoph Hellwig <hch@infradead.org>,
        Roman Gushchin <guro@fb.com>,
        Mike Kravetz <mike.kravetz@oracle.com>,
        Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>,
        Michal Hocko <mhocko@suse.com>,
        Joonsoo Kim <iamjoonsoo.kim@lge.com>
Subject: [PATCH v3 1/8] mm/page_isolation: prefer the node of the source page
Date:   Tue, 23 Jun 2020 15:13:41 +0900
Message-Id: <1592892828-1934-2-git-send-email-iamjoonsoo.kim@lge.com>
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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>
Acked-by: Michal Hocko <mhocko@suse.com>
Reviewed-by: Vlastimil Babka <vbabka@suse.cz>
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 f6d07c5..aec26d9 100644
--- a/mm/page_isolation.c
+++ b/mm/page_isolation.c
@@ -309,5 +309,7 @@ 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