This is v4. Thank you for hints/commentes to previous versions. I think this versions only contains necessary things and not invasive. Tested several patterns of node hotplug and seems to work well.
Changes since v3 - removed changes against get_unbound_pool() - remvoed codes in cpu offline event. - added node unregister callback. clear wq_numa_possible_mask at node offline rather than cpu offline. - updates per-cpu pool's pool-> node at node_(un)register. - added more comments. - almost all codes are under CONFIG_MEMORY_HOTPLUG include/linux/memory_hotplug.h | 3 + kernel/workqueue.c | 81 ++++++++++++++++++++++++++++++++++++++++- mm/memory_hotplug.c | 6 ++- 3 files changed, 88 insertions(+), 2 deletions(-) Original problem was a memory allocation failure because pool->node points to not-online node. This happens when cpu<->node mapping changes. Yasuaki Ishimatsu hit a allocation failure bug when the numa mapping between CPU and node is changed. This was the last scene: SLUB: Unable to allocate memory on node 2 (gfp=0x80d0) cache: kmalloc-192, object size: 192, buffer size: 192, default order: 1, min order: 0 node 0: slabs: 6172, objs: 259224, free: 245741 node 1: slabs: 3261, objs: 136962, free: 127656 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
