Re: [PATCH 1/2] thp: fix anononymous page accounting in fallbackpath for COW of HZP

From: Kirill A. Shutemov
Date: Mon Dec 03 2012 - 03:14:04 EST

On Mon, Dec 03, 2012 at 11:14:38AM +0800, Bob Liu wrote:
> On Fri, Nov 30, 2012 at 11:03 PM, Kirill A. Shutemov
> <kirill.shutemov@xxxxxxxxxxxxxxx> wrote:
> > From: "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>
> >
> > Don't forget to account newly allocated page in fallback path for
> > copy-on-write of huge zero page.
> >
> What about fallback path in do_huge_pmd_wp_page_fallback()?
> I think we should also account newly allocated page in it.

No. Normal huge pages has already accounted on fork(). See

Huge zero page (as 4k zero page) doesn't contribute to RSS, so we need to
account the page which replaces huge zero page on COW.
Kirill A. Shutemov

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