Current code assumes that memory is at node level, but on non numa
machines there is no node level at all. Instead of assuming memory
location in a topology search for it dynamically.
Use hwloc_get_next_obj_by_type() instead of directly following cousin
list and handle list wrap around. Also fixed use of uninitialized
variable (I wonder why compiler did not complain).
Current code crashes on an assert while dividing memory to cpus if number
of cpus seastar is configured to use is smaller then number of available
numa nodes. The reason is that seastar tries to use all available memory,
but considers only one numa node while dividing it. This patch makes
memory division two phase process: first each cpu tries to grub as
much memory from its local node as it can, second all free memory that
was left is divided between all cpus. The algorithm works like that to
prevent one cpu from stealing local memory from another cpu.
