At 10/06/2012 03:06 AM, KOSAKI Motohiro Wrote: >> 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. > OK, I will try it. Thanks Wen Congyang -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>