Linux VM
	• Kernel is pinned • Rest of frames used – Processes – Buffer cache – Page Cache • Multilevel paging – 3 levels – Contiguous (slab) memory allocation using buddy algorithm • Replacement – goal keep a certain number of pages free – Daemon (kswapd) runs once per second • Clock algorithm on page and buffer caches • Clock on unused shared pages • Modified clock (by VA order) on user processes (by # of frames)