Hillf Danton wrote:
> On Sun, May 12, 2013 at 9:23 AM, Kirill A. Shutemov
> <kirill.shutemov@xxxxxxxxxxxxxxx> wrote:
> > From: "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>
> >
> > Look like all pieces are in place, we can map file-backed huge-pages
> > now.
> >
> > Signed-off-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
> > ---
> > include/linux/huge_mm.h | 4 +++-
> > mm/memory.c | 5 ++++-
> > 2 files changed, 7 insertions(+), 2 deletions(-)
> >
> > diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h
> > index f4d6626..903f097 100644
> > --- a/include/linux/huge_mm.h
> > +++ b/include/linux/huge_mm.h
> > @@ -78,7 +78,9 @@ extern bool is_vma_temporary_stack(struct vm_area_struct *vma);
> > (1<<TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG) && \
> > ((__vma)->vm_flags & VM_HUGEPAGE))) && \
> > !((__vma)->vm_flags & VM_NOHUGEPAGE) && \
> > - !is_vma_temporary_stack(__vma))
> > + !is_vma_temporary_stack(__vma) && \
> > + (!(__vma)->vm_ops || \
> > + mapping_can_have_hugepages((__vma)->vm_file->f_mapping)))
>
> Redefine, why?
>
> > #define transparent_hugepage_defrag(__vma) \
> > ((transparent_hugepage_flags & \
> > (1<<TRANSPARENT_HUGEPAGE_DEFRAG_FLAG)) || \
> > diff --git a/mm/memory.c b/mm/memory.c
> > index ebff552..7fe9752 100644
> > --- a/mm/memory.c
> > +++ b/mm/memory.c
> > @@ -3939,10 +3939,13 @@ retry:
> > if (!pmd)
> > return VM_FAULT_OOM;
> > if (pmd_none(*pmd) && transparent_hugepage_enabled(vma)) {
> > - int ret = 0;
> > + int ret;
> > if (!vma->vm_ops)
> > ret = do_huge_pmd_anonymous_page(mm, vma, address,
> > pmd, flags);
>
> Ah vma->vm_ops is checked here, so
> else if (mapping_can_have_hugepages())
Okay, it's cleaner.
--
Kirill A. Shutemov
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