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[v6,23/71] mm/khugepaged: Optimize collapse_pte_mapped_thp() by using vma_lookup()

Message ID 20220215144241.3812052-23-Liam.Howlett@oracle.com (mailing list archive)
State New
Headers show
Series Introducing the Maple Tree | expand

Commit Message

Liam R. Howlett Feb. 15, 2022, 2:43 p.m. UTC 
From: "Liam R. Howlett" <Liam.Howlett@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@Oracle.com>
Reviewed-by: Vlastimil Babka <vbabka@suse.cz>
---
 mm/khugepaged.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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Patch

diff --git a/mm/khugepaged.c b/mm/khugepaged.c
index 131492fd1148..7507b786f1a0 100644
--- a/mm/khugepaged.c
+++ b/mm/khugepaged.c
@@ -1446,7 +1446,7 @@  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;