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SubjectRe: [PATCH 1/2] mm, thp: introduce dedicated transparent huge page allocation interfaces
On Tue, Oct 17, 2017 at 02:12:46PM +0300, Kirill A. Shutemov wrote:
> On Mon, Oct 16, 2017 at 05:19:16PM +0800, changbin.du@intel.com wrote:
> > @@ -501,6 +501,45 @@ void prep_transhuge_page(struct page *page)
> > set_compound_page_dtor(page, TRANSHUGE_PAGE_DTOR);
> > }
> >
> > +struct page *alloc_transhuge_page_vma(gfp_t gfp_mask,
> > + struct vm_area_struct *vma, unsigned long addr)
> > +{
> > + struct page *page;
> > +
> > + page = alloc_pages_vma(gfp_mask | __GFP_COMP, HPAGE_PMD_ORDER,
> > + vma, addr, numa_node_id(), true);
> > + if (unlikely(!page))
> > + return NULL;
> > + prep_transhuge_page(page);
> > + return page;
> > +}
> > +
> > +struct page *alloc_transhuge_page_nodemask(gfp_t gfp_mask,
> > + int preferred_nid, nodemask_t *nmask)
> > +{
> > + struct page *page;
> > +
> > + page = __alloc_pages_nodemask(gfp_mask | __GFP_COMP, HPAGE_PMD_ORDER,
> > + preferred_nid, nmask);
> > + if (unlikely(!page))
> > + return NULL;
> > + prep_transhuge_page(page);
> > + return page;
> > +}
> > +
> > +struct page *alloc_transhuge_page(gfp_t gfp_mask)
> > +{
> > + struct page *page;
> > +
> > + VM_BUG_ON(!(gfp_mask & __GFP_COMP));
>
> Why do you check for __GFP_COMP only in this helper?
>
> > + page = alloc_pages(gfp_mask | __GFP_COMP, HPAGE_PMD_ORDER);
>
> And still apply __GFP_COMP anyway?
>
This is a mistake, will removed. Thanks.

> > + if (unlikely(!page))
> > + return NULL;
> > + prep_transhuge_page(page);
> > + return page;
> > +}
> > +
> > unsigned long __thp_get_unmapped_area(struct file *filp, unsigned long len,
> > loff_t off, unsigned long flags, unsigned long size)
> > {
>
> --
> Kirill A. Shutemov

--
Thanks,
Changbin Du
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