@Collection
def memory_subsystem():
    """ Config the memory subsystem """

    @Collection
    def physical_mm():
        """ Physical memory manager  """

        @Term
        def pmalloc_method():
            """ Allocation policy for phiscal memory  """
            
            type(["simple", "buddy", "ncontig"])
            default("simple")

        @Group
        def pmalloc_simple_po_thresholds():
            
            @Term
            def pmalloc_simple_max_po0():
                """ free list capacity for order-0 pages  """
                
                type(int)
                default(4096)

            @Term
            def pmalloc_simple_max_po1():
                """ free list capacity for order-1 pages  """

                type(int)
                default(2048)
            
            @Term
            def pmalloc_simple_max_po2():
                """ free list capacity for order-2 pages  """

                type(int)
                default(2048)
            
            @Term
            def pmalloc_simple_max_po3():
                """ free list capacity for order-3 pages  """
                
                type(int)
                default(2048)
            
            @Term
            def pmalloc_simple_max_po4():
                """ free list capacity for order-4 pages  """

                type(int)
                default(512)
            
            @Term
            def pmalloc_simple_max_po5():
                """ free list capacity for order-5 pages  """

                type(int)
                default(512)
            
            @Term
            def pmalloc_simple_max_po6():
                """ free list capacity for order-6 pages  """

                type(int)
                default(128)
            
            @Term
            def pmalloc_simple_max_po7():
                """ free list capacity for order-7 pages  """

                type(int)
                default(128)
            
            @Term
            def pmalloc_simple_max_po8():
                """ free list capacity for order-8 pages  """

                type(int)
                default(64)
            
            @Term
            def pmalloc_simple_max_po9():
                """ free list capacity for order-9 pages  """

                type(int)
                default(32)

            return v(pmalloc_method) == "simple"

    add_to_collection(kernel_feature)