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    Subject[PATCH 5/21] memcg-hierarchy-avoid-unnecessary-reclaim.patch
    From: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>

    If hierarchy is not used, no tree-walk is necessary.

    Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
    Signed-off-by: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
    Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>

    mm/memcontrol.c | 2 ++
    1 file changed, 2 insertions(+)

    Index: mmotm-2.6.28-Dec02/mm/memcontrol.c
    ===================================================================
    --- mmotm-2.6.28-Dec02.orig/mm/memcontrol.c
    +++ mmotm-2.6.28-Dec02/mm/memcontrol.c
    @@ -606,6 +606,8 @@ static int mem_cgroup_hierarchical_recla
    ret = try_to_free_mem_cgroup_pages(root_mem, gfp_mask, noswap);
    if (mem_cgroup_check_under_limit(root_mem))
    return 0;
    + if (!root_mem->use_hierarchy)
    + return ret;

    next_mem = mem_cgroup_get_first_node(root_mem);



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