linux-kernel - Re: [PATCH] pagemap: document KPF

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Message-Id: <20090831083911.715b630b.randy.dunlap@oracle.com>
Date:	Mon, 31 Aug 2009 08:39:11 -0700
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	Wu Fengguang <fengguang.wu@...el.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Josh Triplett <josh@...htriplett.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Andi Kleen <andi@...stfloor.org>,
	Nick Piggin <nickpiggin@...oo.com.au>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Hugh Dickins <hugh.dickins@...cali.co.uk>,
	Chris Wright <chrisw@...hat.com>,
	Izik Eidus <ieidus@...hat.com>
Subject: Re: [PATCH] pagemap: document KPF_KSM and show it in page-types

On Mon, 31 Aug 2009 15:17:02 +0800 Wu Fengguang wrote:

> It indicates to the system admin that processes mapping such pages may be
> eating less physical memory than the reported numbers by legacy tools.
> 
> CC: Hugh Dickins <hugh.dickins@...cali.co.uk>
> CC: Chris Wright <chrisw@...hat.com>
> CC: Izik Eidus <ieidus@...hat.com>
> Signed-off-by: Wu Fengguang <fengguang.wu@...el.com>
> ---
>  Documentation/vm/pagemap.txt |    4 ++++
>  tools/vm/page-types.c        |    2 ++
>  2 files changed, 6 insertions(+)
> 
> --- linux-mm.orig/Documentation/vm/pagemap.txt	2009-08-31 15:02:55.000000000 +0800
> +++ linux-mm/Documentation/vm/pagemap.txt	2009-08-31 15:05:02.000000000 +0800
> @@ -59,6 +59,7 @@ There are three components to pagemap:
>      18. UNEVICTABLE
>      19. HWPOISON
>      20. NOPAGE
> +    21. KSM
>  
>  Short descriptions to the page flags:
>  
> @@ -93,6 +94,9 @@ Short descriptions to the page flags:
>  20. NOPAGE
>      no page frame exists at the requested address
>  
> +21. KSM
> +    identical memory pages dynamicly shared between one or more processes

                              dynamically

> +
>      [IO related page flags]
>   1. ERROR     IO error occurred
>   3. UPTODATE  page has up-to-date data
> --- linux-mm.orig/tools/vm/page-types.c	2009-08-31 15:00:24.000000000 +0800
> +++ linux-mm/tools/vm/page-types.c	2009-08-31 15:02:10.000000000 +0800
> @@ -49,6 +49,7 @@
>  #define KPF_UNEVICTABLE		18
>  #define KPF_HWPOISON		19
>  #define KPF_NOPAGE		20
> +#define KPF_KSM			21
>  
>  /* [32-] kernel hacking assistances */
>  #define KPF_RESERVED		32
> @@ -97,6 +98,7 @@ static char *page_flag_names[] = {
>  	[KPF_UNEVICTABLE]	= "u:unevictable",
>  	[KPF_HWPOISON]		= "X:hwpoison",
>  	[KPF_NOPAGE]		= "n:nopage",
> +	[KPF_KSM]		= "x:ksm",
>  
>  	[KPF_RESERVED]		= "r:reserved",
>  	[KPF_MLOCKED]		= "m:mlocked",


---
~Randy
*** Remember to use Documentation/SubmitChecklist when testing your code ***
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