From: Liam R. Howlett <Liam.Howlett@Oracle.com>
Date: Thu, 8 Apr 2021 20:21:58 +0000 (-0400)
Subject: mm/khugepaged: Optimize collapse_pte_mapped_thp() by using vma_lookup()
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=d21b3704beb8ab61eb4fe31f63c8509e243a62dc;p=users%2Fjedix%2Flinux-maple.git

mm/khugepaged: Optimize collapse_pte_mapped_thp() by using vma_lookup()

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>
---

diff --git a/mm/khugepaged.c b/mm/khugepaged.c
index 045cc579f724..f27673c596d2 100644
--- a/mm/khugepaged.c
+++ b/mm/khugepaged.c
@@ -1430,7 +1430,7 @@ static int khugepaged_add_pte_mapped_thp(struct mm_struct *mm,
 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, _pmd;