On 4/4/22 22:02, Yang Shi wrote: > The hugepage_vma_check() called by khugepaged_enter_vma_merge() does > check VM_NO_KHUGEPAGED. Remove the check from caller and move the check > in hugepage_vma_check() up. > > More checks may be run for VM_NO_KHUGEPAGED vmas, but MADV_HUGEPAGE is > definitely not a hot path, so cleaner code does outweigh. > > Reviewed-by: Miaohe Lin <linmiaohe@xxxxxxxxxx> > Acked-by: Song Liu <song@xxxxxxxxxx> > Signed-off-by: Yang Shi <shy828301@xxxxxxxxx> Acked-by: Vlastimil Babka <vbabka@xxxxxxx> > --- > mm/khugepaged.c | 9 ++++++--- > 1 file changed, 6 insertions(+), 3 deletions(-) > > diff --git a/mm/khugepaged.c b/mm/khugepaged.c > index a4e5eaf3eb01..7d197d9e3258 100644 > --- a/mm/khugepaged.c > +++ b/mm/khugepaged.c > @@ -365,8 +365,7 @@ int hugepage_madvise(struct vm_area_struct *vma, > * register it here without waiting a page fault that > * may not happen any time soon. > */ > - if (!(*vm_flags & VM_NO_KHUGEPAGED) && > - khugepaged_enter_vma_merge(vma, *vm_flags)) > + if (khugepaged_enter_vma_merge(vma, *vm_flags)) > return -ENOMEM; > break; > case MADV_NOHUGEPAGE: > @@ -445,6 +444,9 @@ static bool hugepage_vma_check(struct vm_area_struct *vma, > if (!transhuge_vma_enabled(vma, vm_flags)) > return false; > > + if (vm_flags & VM_NO_KHUGEPAGED) > + return false; > + > if (vma->vm_file && !IS_ALIGNED((vma->vm_start >> PAGE_SHIFT) - > vma->vm_pgoff, HPAGE_PMD_NR)) > return false; > @@ -470,7 +472,8 @@ static bool hugepage_vma_check(struct vm_area_struct *vma, > return false; > if (vma_is_temporary_stack(vma)) > return false; > - return !(vm_flags & VM_NO_KHUGEPAGED); > + > + return true; > } > > int __khugepaged_enter(struct mm_struct *mm)
