In the absence of hotplug we use extra memory proportional to (possible_nodes - online_nodes) * number_of_cgroups. PPC64 has a patch to disable large consumption with large number of cgroups. This patch adds hotplug support to memory cgroups and reverts the commit that limited possible nodes to online nodes. Cc: Tejun Heo <tj@xxxxxxxxxx> Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> Cc: Johannes Weiner <hannes@xxxxxxxxxxx> Cc: Michal Hocko <mhocko@xxxxxxxxxx> Cc: Vladimir Davydov <vdavydov.dev@xxxxxxxxx> I've tested this patches under a VM with two nodes and movable nodes enabled. I've offlined nodes and checked that the system and cgroups with tasks deep in the hierarchy continue to work fine. Balbir Singh (3): Add basic infrastructure for memcg hotplug support Move from all possible nodes to online nodes powerpc: fix node_possible_map limitations arch/powerpc/mm/numa.c | 7 ---- mm/memcontrol.c | 96 +++++++++++++++++++++++++++++++++++++++++++------- 2 files changed, 83 insertions(+), 20 deletions(-) -- 2.5.5 -- 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>