Summary:
... ahead of dynamic variant.
* Introduce an Unref function for a common pattern. Cases that were previously using std::memory_order_acq_rel we doing so because we were saving the pre-updated value in case it might be used. Now we are explicitly throwing away the pre-updated value so do not need the acquire semantic, just release.
* Introduce a reusable EvictionData struct and TrackAndReleaseEvictedEntry() function.
* Based on a linter suggesting, use const Func& parameter type instead of Func for templated callable parameters.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/11630
Test Plan: existing tests, and performance test with release build of cache_bench. Getting 1-2% difference between before & after from run to run, but inconsistent about which one is faster.
Reviewed By: jowlyzhang
Differential Revision: D47657334
Pulled By: pdillinger
fbshipit-source-id: 5cf2377c0d47a39143b04be6735f98c550e8bdc3
Peter Dillinger
c41122b1a0