[RFC][PATCH -mmotm 0/2] misc patches for memory cgroup hierarchy

[Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>]

Hi.

I'm writing some patches for memory cgroup hierarchy.

I think KAMEZAWA-san's cgroup-id patches are the most important pathes now,
but I post these patches as RFC before going further.

Patch descriptions:
- [1/2] take account of memsw
    mem_cgroup_hierarchical_reclaim checks only mem->res now.
    It should also check mem->memsw when do_swap_account.
- [2/2] avoid oom
    In previous implementation, mem_cgroup_try_charge checked the return
    value of mem_cgroup_try_to_free_pages, and just retried if some pages
    had been reclaimed.
    But now, try_charge(and mem_cgroup_hierarchical_reclaim called from it)
    only checks whether the usage is less than the limit.
    I see oom easily in some tests which didn't cause oom before.

Both patches are for memory-cgroup-hierarchical-reclaim-v4 patch series.

My current plan for memory cgroup hierarchy:
- If hierarchy is enabled, limit of child should not exceed that of parent.
- Change other calls for mem_cgroup_try_to_free_page() to
  mem_cgroup_hierarchical_reclaim() if possible.


Thanks,
Daisuke Nishimura.

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