What is meant by local and remote memory?
The terms local memory and remote memory are typically used in reference to a currently running process. That said, local memory is typically defined to be the memory that is on the same node as the CPU currently running the process. Any memory that does not belong to the node on which the process is currently running is then, by that definition, remote. Local and remote memory can also be used in reference to things other than the currently running process. When in interrupt context, there technically is no currently executing process, but memory on the node containing the CPU handling the interrupt is still called local memory. Also, you could use local and remote memory in terms of a disk. For example if there was a disk (attached to node 1) doing a DMA, the memory it is reading or writing would be called remote if it were located on another node (i.e. node 0).
