Buddy System
	• Maintain a segment of contiguous pinned VM • Round up each request to nearest power of 2 • Recursively divide a chunk of size 2k into two “buddies” of size 2k-1 until an desired size • When freeing an object, recursively coalesce its block with adjacent free buddies • Problem, still a lot of fragmentation – E.g., 11 Kbyte page table requires 16 Kbytes