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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 <balbir@linux.vnet.ibm.com> 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 ....free 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
difficult.
Anyway, I'll make this patch readable and post again.

Thanks,
-Kame



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