From: Miaohe Lin <linmiaohe@xxxxxxxxxx> Subject: 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@xxxxxxxxxx Signed-off-by: Miaohe Lin <linmiaohe@xxxxxxxxxx> Reviewed-by: David Hildenbrand <david@xxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- mm/mlock.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/mm/mlock.c~mm-mlock-stop-counting-mlocked-pages-when-none-vma-is-found +++ a/mm/mlock.c @@ -622,7 +622,7 @@ static unsigned long count_mm_mlocked_pa vma = find_vma(mm, start); if (vma == NULL) - vma = mm->mmap; + return 0; for (; vma ; vma = vma->vm_next) { if (start >= vma->vm_end) _
