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24_2 - Dynamic Memory Allocation 1 Outline ExplicitFreeList...

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1 Dynamic Memory Allocation
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2 Outline Explicit Free List Segregated Free List Suggested reading: 10.9
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3 Explicit free lists Explicit list among the free blocks using pointers within the  free blocks Use data space for link pointers Typically doubly linked Still need boundary tags for coalescing It is important to realize that links are not necessarily in the same  order as the blocks
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4 Explicit free lists A B C 4 4 4 4 6 6 4 4 4 4 Forward links Back links A B C
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5 Freeing with explicit free lists Where to put the newly freed block in the free list LIFO (last-in-first-out) policy insert freed block at the beginning of the free list pro: simple and constant time con: studies suggest fragmentation is worse than address ordered.
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6 Freeing with explicit free lists Where to put the newly freed block in the free list Address-ordered policy
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