[$] The guaranteed contiguous memory allocator

As a system runs and its memory becomes fragmented, allocating large,physically contiguous regions of memory becomes increasingly difficult.Much effort over the years has gone into avoiding the need to make suchallocations whenever possible, but there are times when they simply cannotbe avoided. The kernel's contiguous memoryallocator (CMA) subsystem attempts to make such allocations possible,but it has never been a perfect solution. Suren Baghdasaryan is is tryingto improve that situation with the guaranteedcontiguous memory allocator patch set, which includes work from MinchanKim as well.