Re: [RFC PATCH] page_cgroup: Reduce allocation overhead forpage_cgroup array for CONFIG_SPARSEMEM

From: Dave Hansen
Date: Wed Feb 23 2011 - 13:19:36 EST


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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