Linux: Memory Compaction
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Mel Gorman posted the seventh version of his Memory Compaction patches asking, "are there any further obstacles to merging?" The patches, first posted in May of 2007, provide a mechanism for moving GFP_MOVABLE pages into a smaller number of pageblocks, reducing externally fragmented memory. Mel explains that 'compaction' is another method of defragmenting memory, "for example, lumpy reclaim is a form of defragmentation as was slub 'defragmentation' (really a form of targeted reclaim). Hence, this is called 'compaction' to distinguish it from other forms of defragmentation."
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