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Update Garbage-Collector.md

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Justin Ethier 2016-01-20 23:02:00 -05:00
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@ -241,7 +241,7 @@ Limitations or potential issues:
- Heap memory fragmentation has not been addressed and could be an issue for long-running programs. Traditionally a compaction process is used to defragment a heap. An alternative strategy has also been suggested by Pizlo:
> instead of copying objects to evacuate fragmented regions of the heap, fragmentation is instead embraced. A fragmented heap is allowed to stay fragmented, but the collector ensures that it can still satisfy allocation requests even if no large enough contiguous free region of space exists.
> instead of copying objects to evacuate fragmented regions of the heap, fragmentation is instead embraced. A fragmented heap is allowed to stay fragmented, but the collector ensures that it can still satisfy allocation requests even if no large enough contiguous free region of space exists.
- Accordingly, the runtime needs to be able to handle large objects that could potentially span one or more pages.
- There is probably too much heap locking going on, and this could be an issue for a large heap and/or a large number of mutators. Improvements can likely be made in this area.