linux-kernel - Re: [RFC V4] mm:add KPF_ZERO_PAGE flag for /proc/kpageflags

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Date:	Mon, 8 Dec 2014 13:46:01 +0200
From:	"Kirill A. Shutemov" <kirill@...temov.name>
To:	"Wang, Yalin" <Yalin.Wang@...ymobile.com>
Cc:	'Andrew Morton' <akpm@...ux-foundation.org>,
	'Konstantin Khlebnikov' <koct9i@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"n-horiguchi@...jp.nec.com" <n-horiguchi@...jp.nec.com>
Subject: Re: [RFC V4] mm:add KPF_ZERO_PAGE flag for /proc/kpageflags

On Mon, Dec 08, 2014 at 10:00:50AM +0800, Wang, Yalin wrote:
> This patch add KPF_ZERO_PAGE flag for zero_page,
> so that userspace process can notice zero_page from
> /proc/kpageflags, and then do memory analysis more accurately.
> 
> Signed-off-by: Yalin Wang <yalin.wang@...ymobile.com>
> ---
>  Documentation/vm/pagemap.txt           |  5 +++++
>  fs/proc/page.c                         | 16 +++++++++++++---
>  include/linux/huge_mm.h                | 12 ++++++++++++
>  include/uapi/linux/kernel-page-flags.h |  1 +
>  mm/huge_memory.c                       |  7 +------
>  5 files changed, 32 insertions(+), 9 deletions(-)
> 
> diff --git a/Documentation/vm/pagemap.txt b/Documentation/vm/pagemap.txt
> index 5948e45..fdeb06e 100644
> --- a/Documentation/vm/pagemap.txt
> +++ b/Documentation/vm/pagemap.txt
> @@ -62,6 +62,8 @@ There are three components to pagemap:
>      20. NOPAGE
>      21. KSM
>      22. THP
> +    23. BALLOON
> +    24. ZERO_PAGE
>  
>  Short descriptions to the page flags:
>  
> @@ -102,6 +104,9 @@ Short descriptions to the page flags:
>  22. THP
>      contiguous pages which construct transparent hugepages
>  
> +24. ZERO_PAGE
> +    zero page for pfn_zero or huge_zero page
> +
>      [IO related page flags]
>   1. ERROR     IO error occurred
>   3. UPTODATE  page has up-to-date data

Would be nice to document BALLOON while you're there.
Otherwise looks good to me.

Acked-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>

-- 
 Kirill A. Shutemov
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