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    SubjectRe: [PATCH 0/10] memory-hotplug: hot-remove physical memory
    > Known problems:
    > 1. memory can't be offlined when CONFIG_MEMCG is selected.
    > For example: there is a memory device on node 1. The address range
    > is [1G, 1.5G). You will find 4 new directories memory8, memory9, memory10,
    > and memory11 under the directory /sys/devices/system/memory/.
    > If CONFIG_MEMCG is selected, we will allocate memory to store page cgroup
    > when we online pages. When we online memory8, the memory stored page cgroup
    > is not provided by this memory device. But when we online memory9, the memory
    > stored page cgroup may be provided by memory8. So we can't offline memory8
    > now. We should offline the memory in the reversed order.
    > When the memory device is hotremoved, we will auto offline memory provided
    > by this memory device. But we don't know which memory is onlined first, so
    > offlining memory may fail. In such case, you should offline the memory by
    > hand before hotremoving the memory device.

    Just iterate twice. 1st iterate: offline every non primary memory
    block. 2nd iterate:
    offline primary (i.e. first added) memory block. It may work.


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