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 6c0185fdd81581dc51bb0c2fbd2f5ab7e5e0582f..33cf91529f0b27cdcf1f98554874fbc1d09b65e6 100644 (file)
--- a/mm/khugepaged.c
+++ b/mm/khugepaged.c
@@ -1431,7 +1431,7 @@ 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;