Re: [PATCH 9/13] memcg: lookup page cgroup (and remove pointerfrom struct page)

[Peter Zijlstra]

On Mon, 2008-09-22 at 20:12 +0900, KAMEZAWA Hiroyuki wrote:

>   - all page_cgroup struct is maintained by hash. 
>     I think we have 2 ways to handle sparse index in general
>     ...radix-tree and hash. This uses hash because radix-tree's layout is
>     affected by memory map's layout.

Could you provide further detail? That is, is this solely because our
radix tree implementation is sucky for large indexes?

If so, I did most of the work of fixing that, just need to spend a
little more time to stabalize the code.

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