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From:   Liam Howlett <liam.howlett@oracle.com>
To:     "maple-tree@lists.infradead.org" <maple-tree@lists.infradead.org>,
        "linux-mm@kvack.org" <linux-mm@kvack.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        Andrew Morton <akpm@linux-foundation.org>
Subject: [PATCH v5 22/70] mm/khugepaged: Optimize collapse_pte_mapped_thp() by
 using vma_lookup()
Thread-Topic: [PATCH v5 22/70] mm/khugepaged: Optimize
 collapse_pte_mapped_thp() by using vma_lookup()
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Date:   Wed, 2 Feb 2022 02:42:06 +0000
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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(-)

diff --git a/mm/khugepaged.c b/mm/khugepaged.c
index 35f14d0a00a6..c4c4107bb767 100644
--- a/mm/khugepaged.c
+++ b/mm/khugepaged.c
@@ -1430,7 +1430,7 @@ static int khugepaged_add_pte_mapped_thp(struct mm_st=
ruct *mm,
 void collapse_pte_mapped_thp(struct mm_struct *mm, unsigned long addr)
 {
 	unsigned long haddr =3D addr & HPAGE_PMD_MASK;
-	struct vm_area_struct *vma =3D find_vma(mm, haddr);
+	struct vm_area_struct *vma =3D vma_lookup(mm, haddr);
 	struct page *hpage;
 	pte_t *start_pte, *pte;
 	pmd_t *pmd, _pmd;
--=20
2.34.1