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    Subject[PATCH v3 19/21] memcg: check lru vectors emptiness in pre-destroy
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    We must abort cgroup destroying if it still not empty,
    resource counter cannot catch isolated uncharged pages.

    Signed-off-by: Konstantin Khlebnikov <khlebnikov@openvz.org>
    ---
    mm/memcontrol.c | 10 +++++++++-
    1 files changed, 9 insertions(+), 1 deletions(-)

    diff --git a/mm/memcontrol.c b/mm/memcontrol.c
    index 4de8044..fbeff85 100644
    --- a/mm/memcontrol.c
    +++ b/mm/memcontrol.c
    @@ -4859,8 +4859,16 @@ free_out:
    static int mem_cgroup_pre_destroy(struct cgroup *cont)
    {
    struct mem_cgroup *memcg = mem_cgroup_from_cont(cont);
    + int ret;
    +
    + ret = mem_cgroup_force_empty(memcg, false);
    + if (ret)
    + return ret;

    - return mem_cgroup_force_empty(memcg, false);
    + if (mem_cgroup_nr_lru_pages(memcg, -1))
    + return -EBUSY;
    +
    + return 0;
    }

    static void mem_cgroup_destroy(struct cgroup *cont)


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