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    Subject[PATCH 0/6 v4] memcg: page cgroup diet

    Here is v4. I removed RFC and fixed a fatal bug in v3.

    This patch series is a preparetion for removing page_cgroup->flags. To remove
    it, we need to reduce flags on page_cgroup. In this set, PCG_MOVE_LOCK and
    PCG_FILE_MAPPED are remvoed.

    After this, we only have 3 bits.
    ==
    enum {
    /* flags for mem_cgroup */
    PCG_LOCK, /* Lock for pc->mem_cgroup and following bits. */
    PCG_USED, /* this object is in use. */
    PCG_MIGRATION, /* under page migration */
    __NR_PCG_FLAGS,
    };
    ==

    I'll make a try to merge this 3bits to lower 3bits of pointer to
    memcg. Then, we can make page_cgroup 8(4)bytes per page.


    Major changes since v3 are
    - replaced move_lock_page_cgroup() with move_lock_mem_cgroup().
    passes pointer to memcg rather than page_cgroup.

    Working on linux-next feb13 and passed several tests.

    Thanks,
    -Kame



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