linux-kernel - Re: [PATCH 6/6] Add comment in alloc_pages_exact

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Message-ID: <20100413161326.GG25756@csn.ul.ie>
Date:	Tue, 13 Apr 2010 17:13:26 +0100
From:	Mel Gorman <mel@....ul.ie>
To:	Minchan Kim <minchan.kim@...il.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Bob Liu <lliubbo@...il.com>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [PATCH 6/6] Add comment in alloc_pages_exact_node

On Wed, Apr 14, 2010 at 12:25:03AM +0900, Minchan Kim wrote:
> alloc_pages_exact_node naming makes some people misleading.
> They considered it following as.
> "This function will allocate pages from node which I wanted
> exactly".
> But it can allocate pages from fallback list if page allocator
> can't find free page from node user wanted.
> 
> So let's comment this NOTE.
> 

It's a little tough to read. How about

/*
 * Use this instead of alloc_pages_node when the caller knows
 * exactly which node they need (as opposed to passing in -1
 * for current). Fallback to other nodes will still occur
 * unless __GFP_THISNODE is specified.
 */

That at least will tie in why "exact" is in the name?

> Actually I wanted to change naming with better.
> ex) alloc_pages_explict_node.

"Explicit" can also be taken to mean "this and only this node".

> But I changed my mind since the comment would be enough.
> 
> If anybody suggests better name, I will do with pleasure.
> 
> Cc: Mel Gorman <mel@....ul.ie>
> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
> Cc: Bob Liu <lliubbo@...il.com>
> Signed-off-by: Minchan Kim <minchan.kim@...il.com>
> ---
>  include/linux/gfp.h |    5 +++++
>  1 files changed, 5 insertions(+), 0 deletions(-)
> 
> diff --git a/include/linux/gfp.h b/include/linux/gfp.h
> index b65f003..7539c17 100644
> --- a/include/linux/gfp.h
> +++ b/include/linux/gfp.h
> @@ -288,6 +288,11 @@ static inline struct page *alloc_pages_node(int nid, gfp_t gfp_mask,
>  	return __alloc_pages(gfp_mask, order, node_zonelist(nid, gfp_mask));
>  }
>  
> +/*
> + * NOTE : Allow page from fallback if page allocator can't find free page
> + * in your nid. Only if you want to allocate page from your nid, use
> + * __GFP_THISNODE flags with gfp_mask.
> + */
>  static inline struct page *alloc_pages_exact_node(int nid, gfp_t gfp_mask,
>  						unsigned int order)
>  {
> -- 
> 1.7.0.5
> 

-- 
Mel Gorman
Part-time Phd Student                          Linux Technology Center
University of Limerick                         IBM Dublin Software Lab
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