>> arch/powerpc/mm/numa.c | 7 ------- >> 1 file changed, 7 deletions(-) >> >> diff --git a/arch/powerpc/mm/numa.c b/arch/powerpc/mm/numa.c >> index 15c2dd5..18f3038 100644 >> --- a/arch/powerpc/mm/numa.c >> +++ b/arch/powerpc/mm/numa.c >> @@ -907,13 +907,6 @@ void __init initmem_init(void) >> >> memblock_dump_all(); >> >> - /* >> - * Reduce the possible NUMA nodes to the online NUMA nodes, >> - * since we do not support node hotplug. This ensures that we >> - * lower the maximum NUMA node ID to what is actually present. >> - */ >> - nodes_and(node_possible_map, node_possible_map, node_online_map); >> - > > There is an overhead with turning this off if you have too many cgroups > with the memory controller. I think this fix was added for a pathological > test case. On my system I see 84 cgroups with 1 node, so the probable > overhead is 84*255*sizeof(struct mem_cgroup_tree_per_node). > > I tried some patches to reduce the overhead, but those need more overhauling > and rework.
Is there some other way to add a node to a dynamic, running system without crashing? I have not encountered one as yet. > Balbir Singh. -- Michael W. Bringmann Linux Technology Center IBM Corporation Tie-Line 363-5196 External: (512) 286-5196 Cell: (512) 466-0650 m...@linux.vnet.ibm.com
