On 13.08.2014 [17:13:01 -0700], Nishanth Aravamudan wrote: > Anton noticed (http://www.spinics.net/lists/linux-mm/msg67489.html) that > on ppc LPARs with memoryless nodes, a large amount of memory was > consumed by slabs and was marked unreclaimable. He tracked it down to > slab deactivations in the SLUB core when we allocate remotely, leading > to poor efficiency always when memoryless nodes are present. > > After much discussion, Joonsoo provided a few patches that help > significantly. They don't resolve the problem altogether: > > - memory hotplug still needs testing, that is when a memoryless node > becomes memory-ful, we want to dtrt > - there are other reasons for going off-node than memoryless nodes, > e.g., fully exhausted local nodes > > Neither case is resolved with this series, but I don't think that should > block their acceptance, as they can be explored/resolved with follow-on > patches. > > The series consists of: > > [1/4] topology: add support for node_to_mem_node() to determine the fallback node > [2/4] slub: fallback to node_to_mem_node() node if allocating on memoryless node > > - Joonsoo's patches to cache the nearest node with memory for each > NUMA node > > [3/4] Partial revert of 81c98869faa5 (""kthread: ensure locality of task_struct allocations") > > - At Tejun's request, keep the knowledge of memoryless node fallback to > the allocator core. > > [4/4] powerpc: reorder per-cpu NUMA information's initialization > > - Fix what appears to be a bug with when the NUMA topology information > is stored in the powerpc initialization code. Andrew & others, I know kernel summit is going on, so I'll be patient, but was just curious if anyone had any further comments other than Christoph's on the naming. Thanks, Nish > > arch/powerpc/kernel/smp.c | 12 ++++++------ > arch/powerpc/mm/numa.c | 13 ++++++++++--- > include/linux/topology.h | 17 +++++++++++++++++ > kernel/kthread.c | 2 +- > mm/page_alloc.c | 1 + > mm/slub.c | 24 ++++++++++++++++++------ > 6 files changed, 53 insertions(+), 16 deletions(-) -- 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>