linux-kernel - Re: [RFC PATCH] page_cgroup: Reduce allocation overhead for page_cgroup array for CONFIG

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Message-ID: <1298485162.7236.4.camel@nimitz>
Date:	Wed, 23 Feb 2011 10:19:22 -0800
From:	Dave Hansen <dave@...ux.vnet.ibm.com>
To:	Michal Hocko <mhocko@...e.cz>
Cc:	linux-mm@...ck.org,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH] page_cgroup: Reduce allocation overhead for
 page_cgroup array for CONFIG_SPARSEMEM

On Wed, 2011-02-23 at 16:10 +0100, Michal Hocko wrote:
> We can reduce this internal fragmentation by splitting the single
> page_cgroup array into more arrays where each one is well kmalloc
> aligned. This patch implements this idea. 

How about using alloc_pages_exact()?  These things aren't allocated
often enough to really get most of the benefits of being in a slab.
That'll at least get you down to a maximum of about PAGE_SIZE wasted.  

-- Dave

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