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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: hvr, erikd, simonmar, jrtc27, trommler Reviewed By: simonmar Subscribers: trommler, jrtc27, rwbarton, thomie, carter Differential Revision: https://phabricator.haskell.org/D4363
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