[PATCH v4 20/66] mm/khugepaged: Optimize collapse_pte_mapped_thp() by using vma_lookup()

Liam Howlett liam.howlett at oracle.com
Wed Dec 1 06:29:58 PST 2021

From: "Liam R. Howlett" <Liam.Howlett at Oracle.com>

vma_lookup() will walk the vma tree once and not continue to look for
the next vma.  Since the exact vma is checked below, this is a more
optimal way of searching.

Signed-off-by: Liam R. Howlett <Liam.Howlett at Oracle.com>
 mm/khugepaged.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/khugepaged.c b/mm/khugepaged.c
index e99101162f1a..0ff7d72cdd1d 100644
--- a/mm/khugepaged.c
+++ b/mm/khugepaged.c
@@ -1433,7 +1433,7 @@ static int khugepaged_add_pte_mapped_thp(struct mm_struct *mm,
 void collapse_pte_mapped_thp(struct mm_struct *mm, unsigned long addr)
 	unsigned long haddr = addr & HPAGE_PMD_MASK;
-	struct vm_area_struct *vma = find_vma(mm, haddr);
+	struct vm_area_struct *vma = vma_lookup(mm, haddr);
 	struct page *hpage;
 	pte_t *start_pte, *pte;
 	pmd_t *pmd, _pmd;

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