Re: [PATCH] pagemap: document KPF_KSM and show it in page-types

[Randy Dunlap <randy.dunlap@oracle.com>]

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@tiscali.co.uk>
> CC: Chris Wright <chrisw@redhat.com>
> CC: Izik Eidus <ieidus@redhat.com>
> Signed-off-by: Wu Fengguang <fengguang.wu@intel.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 ***