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    Subject[PATCH] memcg: towards I/O aware memcg v5
    This is v5.

    Sorry for delaying...but I had time for resetting myself and..several
    changes are added. I think this version is simpler than v4.

    Major changes from v4 is
    a) added kernel/cgroup.c hooks again. (for b)
    b) make RCU aware. previous version seems dangerous in an extreme case.

    Then, codes are updated. Most of changes are related to RCU.

    Patch brief view:
    1. add hooks to kernel/cgroup.c for ID management.
    2. use ID-array in memcg.
    3. record ID to page_cgroup rather than pointer.
    4. make update_file_mapped to be RCU aware routine instead of spinlock.
    5. make update_file_mapped as general-purpose function.


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