linux-kernel - Re: [PATCH 3/6] change alloc function in alloc_slab

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Message-ID: <alpine.DEB.2.00.1004131437140.8617@chino.kir.corp.google.com>
Date:	Tue, 13 Apr 2010 14:37:52 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Minchan Kim <minchan.kim@...il.com>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Mel Gorman <mel@....ul.ie>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Bob Liu <lliubbo@...il.com>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, Christoph Lameter <cl@...ux-foundation.org>,
	Pekka Enberg <penberg@...helsinki.fi>
Subject: Re: [PATCH 3/6] change alloc function in alloc_slab_page

On Wed, 14 Apr 2010, Minchan Kim wrote:

> alloc_slab_page never calls alloc_pages_node with -1.
> 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.
> 
> Cc: Christoph Lameter <cl@...ux-foundation.org>
> Signed-off-by: Minchan Kim <minchan.kim@...il.com>
> ---
>  mm/slub.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/mm/slub.c b/mm/slub.c
> index b364844..9984165 100644
> --- a/mm/slub.c
> +++ b/mm/slub.c
> @@ -1084,7 +1084,7 @@ static inline struct page *alloc_slab_page(gfp_t flags, int node,
>  	if (node == -1)
>  		return alloc_pages(flags, order);
>  	else
> -		return alloc_pages_node(node, flags, order);
> +		return alloc_pages_exact_node(node, flags, order);
>  }
>  
>  static struct page *allocate_slab(struct kmem_cache *s, gfp_t flags, int node)

Slub changes need to go through its maintainer, Pekka Enberg 
<penberg@...helsinki.fi>.
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