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From:   Liam Howlett <liam.howlett@oracle.com>
To:     "maple-tree@lists.infradead.org" <maple-tree@lists.infradead.org>,
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        Liam Howlett <liam.howlett@oracle.com>
Subject: [PATCH 37/94] mm/khugepaged: Optimize collapse_pte_mapped_thp() by
 using vma_lookup()
Thread-Topic: [PATCH 37/94] mm/khugepaged: Optimize collapse_pte_mapped_thp()
 by using vma_lookup()
Thread-Index: AQHXPEQ1PymdabimTUu/A4Cg2b34EA==
Date:   Wed, 28 Apr 2021 15:36:07 +0000
Message-ID: <20210428153542.2814175-38-Liam.Howlett@Oracle.com>
References: <20210428153542.2814175-1-Liam.Howlett@Oracle.com>
In-Reply-To: <20210428153542.2814175-1-Liam.Howlett@Oracle.com>
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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>
---
 mm/khugepaged.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/khugepaged.c b/mm/khugepaged.c
index 6c0185fdd815..33cf91529f0b 100644
--- a/mm/khugepaged.c
+++ b/mm/khugepaged.c
@@ -1431,7 +1431,7 @@ 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
2.30.2