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    SubjectRe: Low overhead patches for the memory cgroup controller (v5)
    * Balbir Singh <balbir@linux.vnet.ibm.com> [2009-06-15 10:09:00]:

    >
    > Feature: Remove the overhead associated with the root cgroup
    >
    > From: Balbir Singh <balbir@linux.vnet.ibm.com>
    >
    > Changelog v5 -> v4
    > 1. Moved back to v3 logic (Daisuke and Kamezawa like that better)
    > 2. Incorporated changes from Daisuke (remove list_empty() checks)
    > 3. Updated documentation to reflect that limits cannot be set on root
    > cgroup
    >
    > Changelog v4 -> v3
    > 1. Rebase to mmotm 9th june 2009
    > 2. Remove PageCgroupRoot, we have account LRU flags to indicate that
    > we do only accounting and no reclaim.
    > 3. pcg_default_flags has been used again, since PCGF_ROOT is gone,
    > we set PCGF_ACCT_LRU only in mem_cgroup_add_lru_list
    > 4. More LRU functions are aware of PageCgroupAcctLRU
    >
    > Changelog v3 -> v2
    >
    > 1. Rebase to mmotm 2nd June 2009
    > 2. Test with some of the test cases recommended by Daisuke-San
    >
    > Changelog v2 -> v1
    > 1. Rebase to latest mmotm
    >
    > This patch changes the memory cgroup and removes the overhead associated
    > with accounting all pages in the root cgroup. As a side-effect, we can
    > no longer set a memory hard limit in the root cgroup.
    >
    > A new flag to track whether the page has been accounted or not
    > has been added as well. Flags are now set atomically for page_cgroup,
    > pcg_default_flags is now obsolete and removed.
    >
    > Signed-off-by: Balbir Singh <balbir@linux.vnet.ibm.com>
    > Signed-off-by: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>

    CC'ing the correct Kamezawa-San

    --
    Balbir


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