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

From: Lee Schermerhorn
Date: Wed Mar 17 2010 - 10:43:25 EST


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@xxxxxxxxxxxxxx>
> Cc: Ravikiran Thirumalai <kiran@xxxxxxxxxxxx>
> Cc: Christoph Lameter <cl@xxxxxxxxxxxxxxxxxxxx>
> Cc: Mel Gorman <mel@xxxxxxxxx>
> Cc: Lee Schermerhorn <lee.schermerhorn@xxxxxx>
> Cc: Hugh Dickins <hugh.dickins@xxxxxxxxxxxxx>
> Cc: <stable@xxxxxxxxxx>

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

[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@xxxxxxx>, 1.12.01
> Updated:
> Hugh Dickins, 4 June 2007
> +Updated:
> + KOSAKI Motohiro, 16 Mar 2010

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