Re: [PATCH v2 2/2] mm: speed up mremap by 500x on large regions

Kirill A. Shutemov
2018-10-12T11:36:45Z

On Fri, Oct 12, 2018 at 02:30:56PM +0300, Kirill A. Shutemov wrote:
> On Thu, Oct 11, 2018 at 06:37:56PM -0700, Joel Fernandes (Google) wrote:
> > @@ -239,7 +287,21 @@ unsigned long move_page_tables(struct vm_area_struct *vma,
> > split_huge_pmd(vma, old_pmd, old_addr);
> > if (pmd_trans_unstable(old_pmd))
> > continue;
> > + } else if (extent == PMD_SIZE) {
>
> Hm. What guarantees that new_addr is PMD_SIZE-aligned?
> It's not obvious to me.

Ignore this :)

--
Kirill A. Shutemov