Hello, Andrew. On Mon, Jul 25, 2016 at 04:20:22PM -0700, Andrew Morton wrote: > > When a pool workqueue is initialized, if its cpumask belongs to a node, its > > pool->node will be mapped to that node. And memory used by this workqueue will > > also be allocated on that node. > > Plan B is to hunt down and fix up all the workqueue structures at > hotplug-time. Has that option been evaluated? > > Your fix is x86-only and this bug presumably affects other > architectures, yes? I think a "Plan B" would fix all architectures? Yeah, that was one of the early approaches. The issue isn't limited to wq. Any memory allocation can have similar issues of underlying node association changing and we don't have any synchronization mechanism around it. It doesn't make any sense to make NUMA association dynamic when the consumer surface is vastly larger and there's nothing inherently dynamic about the association itself. Thanks. -- tejun -- 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>