The patch titled
Subject: mm/hugetlb: optimize the surplus state transfer code in move_hugetlb_state()
has been added to the -mm tree. Its filename is
mm-hugetlb-optimize-the-surplus-state-transfer-code-in-move_hugetlb_state.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/mm-hugetlb-optimize-the-surplus-state-transfer-code-in-move_hugetlb_state.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/mm-hugetlb-optimize-the-surplus-state-transfer-code-in-move_hugetlb_state.patch
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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
@@ -5681,6 +5681,12 @@ 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]--;
_
Patches currently in -mm which might be from linmiaohe@xxxxxxxxxx are
hugetlb_cgroup-fix-imbalanced-css_get-and-css_put-pair-for-shared-mappings.patch
mm-hugetlb-remove-redundant-reservation-check-condition-in-alloc_huge_page.patch
mm-hugetlb-use-some-helper-functions-to-cleanup-code.patch
mm-hugetlb-optimize-the-surplus-state-transfer-code-in-move_hugetlb_state.patch
hugetlb_cgroup-remove-unnecessary-vm_bug_on_page-in-hugetlb_cgroup_migrate.patch
mm-hugetlb-simplify-the-code-when-alloc_huge_page-failed-in-hugetlb_no_page.patch
mm-hugetlb-avoid-calculating-fault_mutex_hash-in-truncate_op-case.patch
