[$] Kernel-text replication on NUMA systems

Kernel developers often go out of their way to reduce the memory used bythe kernel itself; that memory is not available for the workloads thatpeople are actually interested in running on their systems. Lower memoryusage also tends to lead to better performance overall. But there aretimes when the expenditure of some extra memory can make the system faster.The replication of the kernel's text (executable code) and read-only dataacross a NUMA system may be a case in point; patch sets have been postedadding that capability to two architectures.