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.

Link: https://lkml.kernel.org/r/20220504011345.662299-6-Liam.Howlett@oracle.com
Link: https://lkml.kernel.org/r/20220621204632.3370049-22-Liam.Howlett@oracle.com
Link: https://lkml.kernel.org/r/20220720021727.17018-22-Liam.Howlett@oracle.com
Signed-off-by: Liam R. Howlett <Liam.Howlett@Oracle.com>
Reviewed-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: David Howells <dhowells@redhat.com>
Cc: "Matthew Wilcox (Oracle)" <willy@infradead.org>
Cc: SeongJae Park <sj@kernel.org>
Cc: Will Deacon <will@kernel.org>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Cc: David Hildenbrand <david@redhat.com>
Cc: Hulk Robot <hulkci@huawei.com>
Cc: Lukas Bulwahn <lukas.bulwahn@gmail.com>
Cc: Sven Schnelle <svens@linux.ibm.com>
Cc: Yang Yingliang <yangyingliang@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/mm/khugepaged.c b/mm/khugepaged.c
index 01f71786d530353c2c9a14adaf068c13cb204f83..c4f03a2ad6024486c4de51de62c7ca3997ee44fd 100644 (file)
--- a/mm/khugepaged.c
+++ b/mm/khugepaged.c
@@ -1387,7 +1387,7 @@ 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;