On Wed, 17 Nov 2010, shaohui.zheng@xxxxxxxxx wrote: > From: Haicheng Li <haicheng.li@xxxxxxxxx> > > NUMA hotplug emulator introduces a new node state N_HIDDEN to > identify the fake offlined node. It firstly hides RAM via E820 > table and then emulates fake offlined nodes with the hidden RAM. > Hmm, why can't you use numa=hide to hide a specified quantity of memory from the kernel and then use the add_memory() interface to hot-add the offlined memory in the desired quantity? In other words, why do you need to track the offlined nodes with a state? The userspace interface would take a desired size of hidden memory to hot-add and the node id would be the first_unset_node(node_online_map). > After system bootup, user is able to hotplug-add these offlined > nodes, which is just similar to a real hardware hotplug behavior. > > Using boot option "numa=hide=N*size" to fake offlined nodes: > - N is the number of hidden nodes > - size is the memory size (in MB) per hidden node. > size should be parsed with memparse() so users can specify 'M' or 'G', it would even make your parsing code simpler. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom policy in Canada: sign http://dissolvethecrtc.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>