One strategy of allocating kernel memory is known as

When a process running in user mode requests additional memory, pages are allocated from the list of free page frames maintained by the kernel. There are two strategies for allocating kernel memory: buddy system and slab allocation. Slab allocation eliminates fragmentation caused by allocations and deallocations. The technique is used to retain allocated memory that contains a data object of a certain type for reuse upon subsequent allocations of objects of the same type.