[PATCH v7 23/70] mm/khugepaged: Optimize collapse_pte_mapped_thp() by using vma_lookup()

Liam Howlett
2022-04-04T14:37:24Z

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(-)

diff --git a/mm/khugepaged.c b/mm/khugepaged.c
index a4e5eaf3eb01..d0c39b4a78fd 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;
--
2.34.1