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  1. 08 Jan, 2018 1 commit
    • Simon Marlow's avatar
      Improve accuracy of get/setAllocationCounter · a1a689dd
      Simon Marlow authored
      Summary:
      get/setAllocationCounter didn't take into account allocations in the
      current block. This was known at the time, but it turns out to be
      important to have more accuracy when using these in a fine-grained
      way.
      
      Test Plan:
      New unit test to test incrementally larger allocaitons.  Before I got
      results like this:
      
      ```
      +0
      +0
      +0
      +0
      +0
      +4096
      +0
      +0
      +0
      +0
      +0
      +4064
      +0
      +0
      +4088
      +4056
      +0
      +0
      +0
      +4088
      +4096
      +4056
      +4096
      ```
      
      Notice how the results aren't always monotonically increasing.  After
      this patch:
      
      ```
      +344
      +416
      +488
      +560
      +632
      +704
      +776
      +848
      +920
      +992
      +1064
      +1136
      +1208
      +1280
      +1352
      +1424
      +1496
      +1568
      +1640
      +1712
      +1784
      +1856
      +1928
      +2000
      +2072
      +2144
      ```
      
      Reviewers: niteria, bgamari, hvr, erikd
      
      Subscribers: rwbarton, thomie, carter
      
      Differential Revision: https://phabricator.haskell.org/D4288
      a1a689dd