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>
Reviewed-by: Vlastimil Babka <vbabka@suse.cz>

diff --git a/mm/khugepaged.c b/mm/khugepaged.c
index 3e64105398c3d12f9afec7921806d384b974a283..d3313b7a8fe5cb643e05530e2f6b902e3bd847ae 100644 (file)
--- a/mm/khugepaged.c
+++ b/mm/khugepaged.c
@@ -1392,7 +1392,7 @@ 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;