I'm now testing this patch, removing PCG_ACCT_LRU, onto mmotm.
How do you think ?

Here is a performance score at running page fault test.
==
[Before]
    11.20%   malloc  [kernel.kallsyms]  [k] clear_page_c
    ....
     1.80%   malloc  [kernel.kallsyms]  [k] __mem_cgroup_commit_charge
     0.94%   malloc  [kernel.kallsyms]  [k] mem_cgroup_lru_add_list
     0.87%   malloc  [kernel.kallsyms]  [k] mem_cgroup_lru_del_list

[After]
    11.66%   malloc  [kernel.kallsyms]  [k] clear_page_c
    2.17%   malloc  [kernel.kallsyms]  [k] __mem_cgroup_commit_charge
    0.56%   malloc  [kernel.kallsyms]  [k] mem_cgroup_lru_add_list
    0.25%   malloc  [kernel.kallsyms]  [k] mem_cgroup_lru_del_list

==

seems attractive to me.

==