Hello, Xishi, Tang. On Mon, Aug 18, 2014 at 11:18:00AM +0800, Xishi Qiu wrote: > If all the nodes are marked hotpluggable flag, alloc node data will fail. > Because __next_mem_range_rev() will skip the hotpluggable memory regions. > numa_register_memblks() > setup_node_data() > memblock_find_in_range_node() > __memblock_find_range_top_down() > for_each_mem_range_rev() > __next_mem_range_rev() I'm not sure clearing hotplug flag for all memory is the best approach here. The problem is that there are places where we want to be selectively ignoring the hotplug status and apparently we may want it back later. Why not add an agument to memblock allocation / iteration functions so that hotplug area can be skipped selectively? Thanks. -- tejun -- 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>