Jason Evans ee0ab7cd86 Implement chunk allocation/deallocation hysteresis by caching one spare
chunk per arena, rather than immediately deallocating all unused chunks.
This fixes a potential performance issue when allocating/deallocating
an object of size (4kB..1MB] in a loop.

Reported by:	davidxu
2006-12-23 00:18:51 +00:00
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