From: Dave Hansen <dave@linux.vnet.ibm.com>
To: Michal Hocko <mhocko@suse.cz>
Cc: linux-mm@kvack.org,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
linux-kernel@vger.kernel.org
Subject: Re: [RFC PATCH] page_cgroup: Reduce allocation overhead for page_cgroup array for CONFIG_SPARSEMEM
Date: Wed, 23 Feb 2011 10:19:22 -0800 [thread overview]
Message-ID: <1298485162.7236.4.camel@nimitz> (raw)
In-Reply-To: <20110223151047.GA7275@tiehlicka.suse.cz>
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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next prev parent reply other threads:[~2011-02-23 18:19 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-02-23 15:10 [RFC PATCH] page_cgroup: Reduce allocation overhead for page_cgroup array for CONFIG_SPARSEMEM Michal Hocko
2011-02-23 18:19 ` Dave Hansen [this message]
2011-02-23 23:52 ` KAMEZAWA Hiroyuki
2011-02-24 9:35 ` Michal Hocko
2011-02-24 10:02 ` KAMEZAWA Hiroyuki
2011-02-24 9:33 ` Michal Hocko
2011-02-24 13:40 ` [RFC PATCH] page_cgroup: Reduce allocation overhead for page_cgroup array for CONFIG_SPARSEMEM v2 Michal Hocko
2011-02-25 3:25 ` KAMEZAWA Hiroyuki
2011-02-25 9:53 ` [RFC PATCH] page_cgroup: Reduce allocation overhead for page_cgroup array for CONFIG_SPARSEMEM v3 Michal Hocko
2011-02-28 0:53 ` KAMEZAWA Hiroyuki
2011-02-28 9:12 ` [RFC PATCH] page_cgroup: Reduce allocation overhead for page_cgroup array for CONFIG_SPARSEMEM v4 Michal Hocko
2011-02-28 9:23 ` KAMEZAWA Hiroyuki
2011-02-28 9:53 ` Michal Hocko
2011-02-28 9:48 ` KAMEZAWA Hiroyuki
2011-02-28 10:12 ` Michal Hocko
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