a room for blkio-cgroup in struct page_cgroup

[Ryo Tsuruta]

Hi Kamezawa-san,

As you wrote before (http://lkml.org/lkml/2009/7/22/65)
> To be honest, what I expected in these days for people of blockio
> cgroup is like following for getting room for themselves.
<<snip>>
> --- mmotm-2.6.31-Jul16.orig/include/linux/page_cgroup.h
> +++ mmotm-2.6.31-Jul16/include/linux/page_cgroup.h
> @@ -13,7 +13,7 @@
>  struct page_cgroup {
>       unsigned long flags;
>       struct mem_cgroup *mem_cgroup;
> -     struct page *page;
> +     /* block io tracking will use extra unsigned long bytes */
>       struct list_head lru;       /* per cgroup LRU list */
> };

Have you already added a room for blkio_cgroup in struct page_cgroup?
If not, I would like you to apply the above change to mmotm.

The latest blkio-cgroup has reflected the comments you pointed out.
I would also like you to give me any comments on it and consider
merging blkio-cgroup to mmotm.

Thank you for your help in advance.
Ryo Tsuruta
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