[v3,15/66] mm/khugepaged: Optimize collapse_pte_mapped_thp() by using vma_lookup()

Commit Message

Liam R. Howlett Oct. 5, 2021, 1:30 a.m. UTC

From: "Liam R. Howlett" <[e-mail]>

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 <[e-mail]>
---
 mm/khugepaged.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Patch

diff --git a/mm/khugepaged.c b/mm/khugepaged.c
index 045cc579f724..f27673c596d2 100644
--- a/mm/khugepaged.c
+++ b/mm/khugepaged.c
@@ -1430,7 +1430,7 @@  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;