> -----Original Message-----
> From: Konstantin Khlebnikov [mailto:[email protected]]
> Sent: Friday, December 05, 2014 2:39 PM
> To: Kirill A. Shutemov
> Cc: Wang, Yalin; [email protected]; [email protected]; linux-
> [email protected]
> Subject: Re: [RFC V2] mm:add zero_page _mapcount when mapped into user
> space
>
> On Thu, Dec 4, 2014 at 3:28 PM, Kirill A. Shutemov <[email protected]>
> wrote:
> > On Thu, Dec 04, 2014 at 02:10:53PM +0800, Wang, Yalin wrote:
> >> > -----Original Message-----
> >> > From: Kirill A. Shutemov [mailto:[email protected]]
> >> > Sent: Tuesday, December 02, 2014 7:30 PM
> >> > To: Wang, Yalin
> >> > Cc: '[email protected]'; '[email protected]';
> >> > 'linux-arm- [email protected]'
> >> > Subject: Re: [RFC V2] mm:add zero_page _mapcount when mapped into
> >> > user space
> >> >
> >> > On Tue, Dec 02, 2014 at 05:27:36PM +0800, Wang, Yalin wrote:
> >> > > This patch add/dec zero_page's _mapcount to make sure the
> >> > > mapcount is correct for zero_page, so that when read from
> >> > > /proc/kpagecount, zero_page's mapcount is also correct, userspace
> >> > > process like procrank can calculate PSS correctly.
>
> Instead of tweaking mapcount you could mark zero-pages in /proc/kpageflags
> and handle them accordingly in userspace. Or mark zero pages with special
> magic _mapcount and detect it in /proc/kpagecount.
>
I think add KPF_ZERO_PAGE in kpageflags is better.
I will make another patch for review .
Thanks
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