Re: [PATCH] thp: Simplify splitting PMD mapping huge zero page

[Kirill A. Shutemov]

On Fri, Mar 27, 2020 at 01:23:07PM -0400, Zi Yan wrote:
> On 27 Mar 2020, at 13:03, Kirill A. Shutemov wrote:
> 
> > Splitting PMD mapping huge zero page can be simplified a lot: we can
> > just unmap it and fallback to PTE handling.
> 
> So we will have an extra page fault for the first read to each subpage,
> but nothing changes if the first access to a subpage is a write, right?
> BTW, what is the motivation for this code simplification?

Match what we do for file-THP.

I found a problem with the patch. Ignore it for now.

-- 
 Kirill A. Shutemov