linux-kernel - Re: [PATCH 5/5] doc: add the documentation for mpol=local

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Date:	Wed, 17 Mar 2010 10:42:36 -0400
From:	Lee Schermerhorn <Lee.Schermerhorn@...com>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc:	LKML <linux-kernel@...r.kernel.org>, kiran@...lex86.org,
	cl@...ux-foundation.org, hugh.dickins@...cali.co.uk, mel@....ul.ie,
	stable@...nel.org, linux-mm <linux-mm@...ck.org>,
	akpm@...ux-foundation.org
Subject: Re: [PATCH 5/5] doc: add the documentation for mpol=local

On Tue, 2010-03-16 at 14:53 +0900, KOSAKI Motohiro wrote:
> commit 3f226aa1c (mempolicy: support mpol=local tmpfs mount option)
> added new mpol=local mount option. but it didn't add a documentation.
> 
> This patch does it.
> 
> Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
> Cc: Ravikiran Thirumalai <kiran@...lex86.org>
> Cc: Christoph Lameter <cl@...ux-foundation.org>
> Cc: Mel Gorman <mel@....ul.ie>
> Cc: Lee Schermerhorn <lee.schermerhorn@...com>
> Cc: Hugh Dickins <hugh.dickins@...cali.co.uk>
> Cc: <stable@...nel.org>

Acked-by: Lee Schermerhorn <lee.schermerhorn@...com>

[Note:  looking at this patch in context, it appears that a few more
updates are in order.  E.g., "contextualization" of the specified
nodelists based on mems_allowed when one allocates a tmpfs file and what
happens when the mount option nodelist is disjoint from a task's
mems_allowed.  I'll test the behavior to make sure it matches my
expectations and update the doc accordingly in a subsequent patch.]

> ---
>  Documentation/filesystems/tmpfs.txt |    6 +++++-
>  1 files changed, 5 insertions(+), 1 deletions(-)
> 
> diff --git a/Documentation/filesystems/tmpfs.txt b/Documentation/filesystems/tmpfs.txt
> index 3015da0..fe09a2c 100644
> --- a/Documentation/filesystems/tmpfs.txt
> +++ b/Documentation/filesystems/tmpfs.txt
> @@ -82,11 +82,13 @@ tmpfs has a mount option to set the NUMA memory allocation policy for
>  all files in that instance (if CONFIG_NUMA is enabled) - which can be
>  adjusted on the fly via 'mount -o remount ...'
>  
> -mpol=default             prefers to allocate memory from the local node
> +mpol=default             use the process allocation policy
> +                         (see set_mempolicy(2))
>  mpol=prefer:Node         prefers to allocate memory from the given Node
>  mpol=bind:NodeList       allocates memory only from nodes in NodeList
>  mpol=interleave          prefers to allocate from each node in turn
>  mpol=interleave:NodeList allocates from each node of NodeList in turn
> +mpol=local		 prefers to allocate memory from the local node
>  
>  NodeList format is a comma-separated list of decimal numbers and ranges,
>  a range being two hyphen-separated decimal numbers, the smallest and
> @@ -134,3 +136,5 @@ Author:
>     Christoph Rohland <cr@....com>, 1.12.01
>  Updated:
>     Hugh Dickins, 4 June 2007
> +Updated:
> +   KOSAKI Motohiro, 16 Mar 2010

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