[GitHub] [trafficserver] SolidWallOfCode commented on issue #5155: Arena::free just set the last ArenaBlock's m_water_level

[GitBox <gi...@apache.org>]

SolidWallOfCode commented on issue #5155:
URL: https://github.com/apache/trafficserver/issues/5155#issuecomment-915537074


   My `MemArena` doesn't do that either. The problem is finding the appropriate block, which requires walking all the blocks. For performance reasons, `MemArena` has the concept of a "full" block and never looks at those again. Non-stacking de-allocation
   would be more trouble than it's worth for that implementation. One of the costs of using memory arenas like this is the inability
   to release memory. In fact, `MemArena` doesn't have any de-allocation at all. Instead there is direct access to the unused part
   of a block, which can be used without allocation, or used and then allocated. Overall I think it will work better.
   
   [Documentation](http://docs.solidwallofcode.com/libswoc/code/MemArena.en.html).


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