This is just an RFC...test is not enough yet.

I know it's merge window..this post is just for sharing idea.

This patch merges pc->flags and pc->mem_cgroup into a word. Then,
memcg's overhead will be 8bytes per page(4096bytes?).

Because this patch will affect all memory cgroup developers, I'd like to
show patches before MM Summit. I think we can agree the direction to
reduce size of page_cgroup..and finally integrate into 'struct page'
(and remove cgroup_disable= boot option...)

Patch 1/3 - introduce pc_to_mem_cgroup and hide pc->mem_cgroup
Patch 2/3 - remove pc->mem_cgroup
Patch 3/3 - remove memory barriers.

I'm now wondering when this change should be merged....


Thanks,
-Kame

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