[patch 013/143] mm/hugetlb: optimize the surplus state transfer code in move_hugetlb_state()

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From: Miaohe Lin <linmiaohe@xxxxxxxxxx>
Subject: mm/hugetlb: optimize the surplus state transfer code in move_hugetlb_state()

We should not transfer the per-node surplus state when we do not cross the
node in order to save some cpu cycles

Link: https://lkml.kernel.org/r/20210308112809.26107-3-linmiaohe@xxxxxxxxxx
Signed-off-by: Miaohe Lin <linmiaohe@xxxxxxxxxx>
Reviewed-by: Mike Kravetz <mike.kravetz@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---

 mm/hugetlb.c |    6 ++++++
 1 file changed, 6 insertions(+)

--- a/mm/hugetlb.c~mm-hugetlb-optimize-the-surplus-state-transfer-code-in-move_hugetlb_state
+++ a/mm/hugetlb.c
@@ -5682,6 +5682,12 @@ void move_hugetlb_state(struct page *old
 		SetHPageTemporary(oldpage);
 		ClearHPageTemporary(newpage);
 
+		/*
+		 * There is no need to transfer the per-node surplus state
+		 * when we do not cross the node.
+		 */
+		if (new_nid == old_nid)
+			return;
 		spin_lock(&hugetlb_lock);
 		if (h->surplus_huge_pages_node[old_nid]) {
 			h->surplus_huge_pages_node[old_nid]--;
_



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