Two free functions. uvm_pmr_freepages: - used for contiguous page free - used at boot average case complexity:log(s) log(r) worst case complexity:log(s) log(r) uvm_pmr_freepageq: - used for page lists - collates sequences of pages in a single free worst case complexity:n log(s) log(r) average case complexity:n log(s) log(r) s = number of segments n = number of pages to be freed r = number of memory fragments