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@huawei.com Signed-off-by: Miaohe Lin <linmiaohe@huawei.com> Reviewed-by: Mike Kravetz <mike.kravetz@oracle.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -5682,6 +5682,12 @@ void move_hugetlb_state(struct page *oldpage, struct page *newpage, int reason)
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SetHPageTemporary(oldpage);
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SetHPageTemporary(oldpage);
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ClearHPageTemporary(newpage);
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ClearHPageTemporary(newpage);
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/*
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* There is no need to transfer the per-node surplus state
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* when we do not cross the node.
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*/
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if (new_nid == old_nid)
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return;
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spin_lock(&hugetlb_lock);
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spin_lock(&hugetlb_lock);
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if (h->surplus_huge_pages_node[old_nid]) {
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if (h->surplus_huge_pages_node[old_nid]) {
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h->surplus_huge_pages_node[old_nid]--;
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h->surplus_huge_pages_node[old_nid]--;
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