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mm/mlock: stop counting mlocked pages when none vma is found 

There will be no vma satisfies addr < vm_end when find_vma() returns NULL.
Thus it's meaningless to traverse the vma list below because we can't
find any vma to count mlocked pages.  Stop counting mlocked pages in this
case to save some vma list traversal cycles.

Link: https://lkml.kernel.org/r/20210204110705.17586-1-linmiaohe@huawei.com
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Miaohe Lin 2021-02-25 17:17:49 -08:00 committed by Linus Torvalds
parent 94c8945376
commit 48b03eea32
1 changed files with 1 additions and 1 deletions
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mm/mlock.c
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@ -622,7 +622,7 @@ static unsigned long count_mm_mlocked_page_nr(struct mm_struct *mm,
vma = find_vma(mm, start);
if (vma == NULL)
vma = mm->mmap;
return 0;
for (; vma ; vma = vma->vm_next) {
if (start >= vma->vm_end)