[v8,22/70] mm/khugepaged: optimize collapse_pte_mapped_thp() by using vma_lookup()

Commit Message

Liam R. Howlett April 26, 2022, 3:06 p.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]>
Reviewed-by: Vlastimil Babka <[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 9bb32fb7ec74..2f6e4d6ffb79 100644
--- a/mm/khugepaged.c
+++ b/mm/khugepaged.c
@@ -1435,7 +1435,7 @@  static void collapse_and_free_pmd(struct mm_struct *mm, struct vm_area_struct *v
 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;