diff options
| author | Miaohe Lin <linmiaohe@huawei.com> | 2021-02-25 17:17:49 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2021-02-26 09:41:01 -0800 |
| commit | 48b03eea321c85185d173cb0d112698b79b1c98e (patch) | |
| tree | 9d21dfe7a8d019a39a9fb2aa9c8247e49d4f845b | |
| parent | 94c8945376d44b37aa3ab5b58669a2a86326968e (diff) | |
| download | linux-leds-48b03eea321c85185d173cb0d112698b79b1c98e.tar.gz | |
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>
| -rw-r--r-- | mm/mlock.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/mlock.c b/mm/mlock.c index 73960bb3464d00..f8f8cc32d03d0b 100644 --- a/mm/mlock.c +++ b/mm/mlock.c @@ -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) |