sunrpc: use better NUMA affinities

Use NUMA aware allocations to reduce latencies and increase throughput.

sunrpc kthreads can use kthread_create_on_node() if pool_mode is
"percpu" or "pernode", and svc_prepare_thread()/svc_init_buffer() can
also take into account NUMA node affinity for memory allocations.

Signed-off-by: Eric Dumazet <[email protected]>
CC: "J. Bruce Fields" <[email protected]>
CC: Neil Brown <[email protected]>
CC: David Miller <[email protected]>
Reviewed-by: Greg Banks <[email protected]>
[[email protected]: fix up caller nfs41_callback_up]
Signed-off-by: J. Bruce Fields <[email protected]>

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