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. These patches are on top of linux-next (20161117) Changelog v2: Add get/put_online_mems() around node iteration Use MEM_OFFLINE/MEM_ONLINE instead of MEM_GOING_OFFLINE/ONLINE Balbir Singh (3): mm: Add basic infrastructure for memcg hotplug support mm: Move operations to hotplug callbacks powerpc/mm: fix node_possible_map limitations arch/powerpc/mm/numa.c | 7 ---- mm/memcontrol.c | 107 +++++++++++++++++++++++++++++++++++++++++++------ 2 files changed, 94 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>