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    Subjectmemcg: lazy_lru (was Re: [RFC] [PATCH 8/9] memcg: remove page_cgroup pointer from memmap)
    On Fri, 12 Sep 2008 09:12:48 -0700
    Balbir Singh <> wrote:
    > Kamezawa,
    > I feel we can try the following approaches
    > 1. Try per-node per-zone radix tree with dynamic allocation
    > 2. Try the approach you have
    > 3. Integrate with sparsemem (last resort for performance), Dave Hansen suggested
    > adding a mem_section member and using that.
    > I am going to try #1 today and see what the performance looks like

    I'm now writing *lazy* lru handing via per-cpu struct like pagevec.
    It seems works well (but not so fast as expected on 2cpu box....)
    I need more tests but it's not so bad to share the logic at this stage.

    I added 3 patches on to this set. (my old set need bug fix.)
    [1] patches/page_count.patch ....get_page()/put_page() via page_cgroup.
    [2] patches/lazy_lru_free.patch page_cgroup from LRU in lazy way.
    [3] patches/lazy_lru_add.patch ....add page_cgroup to LRU in lazy way.

    3 patches will follow this mail.

    Because of speculative radix-tree lookup, page_count patch seems a bit

    Anyway, I'll make this patch readable and post again.


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