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Describe the Buddy system of memory allocation.
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Free memory is maintained in linked lists, each of equal
sized blocks. Any such block is of size 2k. When some
memory is required by a process, the block size of next
higher order is chosen, and broken into two. The two such
pieces differ in address only in their kth bit. Such pieces
are called buddies. When any used block is freed, the OS
checks to see if its buddy is also free. If so, it is
rejoined, and put into the original free-block linked-list.
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