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anand76 22105366d9 More accurate accounting of compressed cache memory (#13032) 
Summary:
When an item is inserted into the compressed secondary cache, this PR calculates the charge using the malloc_usable_size of the allocated memory, as well as the unique pointer allocation.

Pull Request resolved: https://github.com/facebook/rocksdb/pull/13032

Test Plan: New unit test

Reviewed By: pdillinger

Differential Revision: D63418493

Pulled By: anand1976

fbshipit-source-id: 1db2835af6867442bb8cf6d9bf412e120ddd3824
2024-09-25 17:47:40 -07:00

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Fix under counting of allocated memory in the compressed secondary cache due to looking at the compressed block size rather than the actual memory allocated, which could be larger due to internal fragmentation.