linux-kernel - Re: [PATCH 5/6] change alloc function in __vmalloc_area

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Message-ID: <20100413160227.GF25756@csn.ul.ie>
Date:	Tue, 13 Apr 2010 17:02:28 +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, Nick Piggin <npiggin@...e.de>
Subject: Re: [PATCH 5/6] change alloc function in __vmalloc_area_node

On Wed, Apr 14, 2010 at 12:25:02AM +0900, Minchan Kim wrote:
> __vmalloc_area_node never pass -1 to alloc_pages_node.
> It means node's validity check is unnecessary.
> So we can use alloc_pages_exact_node instead of alloc_pages_node.
> It could avoid comparison and branch as 6484eb3e2a81807722 tried.
> 

Seems fine, the check for node id being negative has already been made.

Reviewed-by: Mel Gorman <mel@....ul.ie>

> Cc: Nick Piggin <npiggin@...e.de>
> Signed-off-by: Minchan Kim <minchan.kim@...il.com>
> ---
>  mm/vmalloc.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/mm/vmalloc.c b/mm/vmalloc.c
> index ae00746..7abf423 100644
> --- a/mm/vmalloc.c
> +++ b/mm/vmalloc.c
> @@ -1499,7 +1499,7 @@ static void *__vmalloc_area_node(struct vm_struct *area, gfp_t gfp_mask,
>  		if (node < 0)
>  			page = alloc_page(gfp_mask);
>  		else
> -			page = alloc_pages_node(node, gfp_mask, 0);
> +			page = alloc_pages_exact_node(node, gfp_mask, 0);
>  
>  		if (unlikely(!page)) {
>  			/* Successfully allocated i pages, free them in __vunmap() */
> -- 
> 1.7.0.5
> 

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