linux-kernel - Re: [PATCH 6/6] add documentation on proc.txt

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Date:	Mon, 22 Apr 2013 10:48:39 -0500
From:	Rob Landley <rob@...dley.net>
To:	Minchan Kim <minchan@...nel.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Michael Kerrisk <mtk.manpages@...il.com>,
	Rik van Riel <riel@...hat.com>,
	Minchan Kim <minchan@...nel.org>
Subject: Re: [PATCH 6/6] add documentation on proc.txt

On 04/22/2013 03:45:06 AM, Minchan Kim wrote:
> This patch adds documentation about new reclaim field in proc.txt
> 
> Cc: Rob Landley <rob@...dley.net>
> Signed-off-by: Minchan Kim <minchan@...nel.org>
> ---
>  Documentation/filesystems/proc.txt | 24 ++++++++++++++++++++++++
>  1 file changed, 24 insertions(+)
> 
> diff --git a/Documentation/filesystems/proc.txt  
> b/Documentation/filesystems/proc.txt
> index 488c094..c1f5ee4 100644
> --- a/Documentation/filesystems/proc.txt
> +++ b/Documentation/filesystems/proc.txt
> @@ -136,6 +136,7 @@ Table 1-1: Process specific entries in /proc
>   maps		Memory maps to executables and library files	 
> (2.4)
>   mem		Memory held by this process
>   root		Link to the root directory of this process
> + reclaim	Reclaim pages in this process
>   stat		Process status
>   statm		Process memory status information
>   status		Process status in human readable form
> @@ -489,6 +490,29 @@ To clear the soft-dirty bit
> 
>  Any other value written to /proc/PID/clear_refs will have no effect.
> 
> +The /proc/PID/reclaim is used to reclaim pages in this process.

Trivial nitpick: Either start with "The file" or just /proc/PID/reclaim

> +To reclaim file-backed pages,
> +    > echo 1 > /proc/PID/reclaim
> +
> +To reclaim anonymous pages,
> +    > echo 2 > /proc/PID/reclaim
> +
> +To reclaim both pages,
> +    > echo 3 > /proc/PID/reclaim
> +
> +Also, you can specify address range of process so part of address  
> space
> +will be reclaimed. The format is following as
> +    > echo 4 addr size > /proc/PID/reclaim

Size is in bytes or pages? (I'm guessing bytes. It must be a multiple  
of pages?)

So the following examples are telling it to reclaim a specific page?

> +To reclaim file-backed pages in address range,
> +    > echo 4 $((1<<20) 4096 > /proc/PID/reclaim
> +
> +To reclaim anonymous pages in address range,
> +    > echo 5 $((1<<20) 4096 > /proc/PID/reclaim
> +
> +To reclaim both pages in address range,
> +    > echo 6 $((1<<20) 4096 > /proc/PID/reclaim
> +
>  The /proc/pid/pagemap gives the PFN, which can be used to find the  
> pageflags
>  using /proc/kpageflags and number of times a page is mapped using
>  /proc/kpagecount. For detailed explanation, see  
> Documentation/vm/pagemap.txt.

Otherwise, if the series goes in I'm fine with this going in with it.

Acked-by: Rob Landley <rob@...dley.net>

Rob--
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