From: Yanfei Xu <yanfei.xu@xxxxxxxxxxxxx> We could check MMF_DISABLE_THP ahead of iterating over all of vma. Otherwise if some mm_struct contain a large number of vma, there will be amounts meaningless cpu cycles cost. Signed-off-by: Yanfei Xu <yanfei.xu@xxxxxxxxxxxxx> --- mm/khugepaged.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/mm/khugepaged.c b/mm/khugepaged.c index a6012b9259a2..f4ad25a7db55 100644 --- a/mm/khugepaged.c +++ b/mm/khugepaged.c @@ -2094,6 +2094,8 @@ static unsigned int khugepaged_scan_mm_slot(unsigned int pages, */ if (unlikely(!mmap_read_trylock(mm))) goto breakouterloop_mmap_lock; + if (test_bit(MMF_DISABLE_THP, &mm->flags)) + goto breakouterloop; if (likely(!khugepaged_test_exit(mm))) vma = find_vma(mm, khugepaged_scan.address); -- 2.27.0
