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SubjectRe: [PATCH 3/9] bio-cgroup controller
On Fri, 17 Apr 2009 16:22:01 +0900 (JST)
Ryo Tsuruta <ryov@valinux.co.jp> wrote:

> In the case where the bio-cgroup data is allocated dynamically,
> - Sometimes quite a large amount of memory get marked dirty.
> In this case it requires more kernel memory than that of the
> current implementation.
> - The operation is expansive due to memory allocations and exclusive
> controls by such as spinlocks.
>
> In the case where the bio-cgroup data is allocated by delayed allocation,
> - It makes the operation complicated and expensive, because
> sometimes a bio has to be created in the context of other
> processes, such as aio and swap-out operation.
>
> I'd prefer a simple and lightweight implementation. bio-cgroup only
> needs 4bytes unlike memory controller. The reason why bio-cgroup chose
> this approach is to minimize the overhead.
>
My point is, plz do your best to reduce memory usage here. You increase
size of page_cgroup just because you cannot increase size of struct page.
It's not be sane reason to increase size of this object.
It's a cheat in my point of view.


Thanks,
-Kame



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