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    Subject[PATCH v5 10/10] Disable task moving when using kernel memory accounting
    Date
    Since this code is still experimental, we are leaving the exact
    details of how to move tasks between cgroups when kernel memory
    accounting is used as future work.

    For now, we simply disallow movement if there are any pending
    accounted memory.

    Signed-off-by: Glauber Costa <glommer@parallels.com>
    CC: Hiroyouki Kamezawa <kamezawa.hiroyu@jp.fujitsu.com>
    ---
    mm/memcontrol.c | 23 ++++++++++++++++++++++-
    1 files changed, 22 insertions(+), 1 deletions(-)

    diff --git a/mm/memcontrol.c b/mm/memcontrol.c
    index b532f91..248f92d 100644
    --- a/mm/memcontrol.c
    +++ b/mm/memcontrol.c
    @@ -5690,10 +5690,19 @@ static int mem_cgroup_can_attach(struct cgroup_subsys *ss,
    {
    int ret = 0;
    struct mem_cgroup *mem = mem_cgroup_from_cont(cgroup);
    + struct mem_cgroup *from = mem_cgroup_from_task(p);
    +
    +#if defined(CONFIG_CGROUP_MEM_RES_CTLR_KMEM) && defined(CONFIG_INET)
    + if (from != mem && !mem_cgroup_is_root(from) &&
    + res_counter_read_u64(&from->tcp.tcp_memory_allocated, RES_USAGE)) {
    + printk(KERN_WARNING "Can't move tasks between cgroups: "
    + "Kernel memory held. task: %s\n", p->comm);
    + return 1;
    + }
    +#endif

    if (mem->move_charge_at_immigrate) {
    struct mm_struct *mm;
    - struct mem_cgroup *from = mem_cgroup_from_task(p);

    VM_BUG_ON(from == mem);

    @@ -5861,6 +5870,18 @@ static int mem_cgroup_can_attach(struct cgroup_subsys *ss,
    struct cgroup *cgroup,
    struct task_struct *p)
    {
    + struct mem_cgroup *mem = mem_cgroup_from_cont(cgroup);
    + struct mem_cgroup *from = mem_cgroup_from_task(p);
    +
    +#if defined(CONFIG_CGROUP_MEM_RES_CTLR_KMEM) && defined(CONFIG_INET)
    + if (from != mem && !mem_cgroup_is_root(from) &&
    + res_counter_read_u64(&from->tcp.tcp_memory_allocated, RES_USAGE)) {
    + printk(KERN_WARNING "Can't move tasks between cgroups: "
    + "Kernel memory held. task: %s\n", p->comm);
    + return 1;
    + }
    +#endif
    +
    return 0;
    }
    static void mem_cgroup_cancel_attach(struct cgroup_subsys *ss,
    --
    1.7.6.4


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