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Linux Memory Compaction Par KernelTrapLe [2010-04-03] à 04:03:38
Présentation : Linux news 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. The core compaction patch explains that memory is compacted in a zone by relocating movable pages towards the end of the zone A single compaction run involves a migration scanner and a free scanner. Both scanners operate on pageblock-sized areas in the zone. The migration scanner starts at the bottom of the zone and searches for all movable pages within each area, isolating them onto a private list called migratelist. The free scanner starts at the top of the zone and searches for suitable areas and consumes the free pages within making them available for the migration scanner. The pages isolated for migration are then migrated to the newly isolated free pages. read more
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