[RFC][PATCH 0/4] some memcg fixes

[Daisuke Nishimura]

Hi.

These are patches that I've been testing.

They survived my test(rmdir aftre task move under memory pressure
and page migration) w/o big problem(except oom) for hours
in both use_hierarchy==0/1 case.

I want them go in 2.6.29.

They are based on mmotm-2009-01-05-12-50.

[1/4] fix for mem_cgroup_get_reclaim_stat_from_page

[2/4] fix error path of mem_cgroup_move_parent

[3/4] fix for mem_cgroup_hierarchical_reclaim

[4/4] make oom less frequently


I think 1 and 2 are ok.
I'll update them based on comments.


Thanks,
Daisuke Nishimura.
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