4a555aaef1
Prior to this commit, the `ConcurrentLruCache` implementation would use arrays of `AtomicReference` as operation buffers, and the buffer count would be calculated with the nearest power of two for the CPU count. This can result in significant heap memory usage as each `AtomicReference` buffer entry adds to the memory pressure. As seen in FasterXML/jackson-databind#3665, this can add a significant overhead for no real added benefit for the current use case. This commit changes the current implementation to use `AtomicReferenceArray` as buffers and reduce the number of buffers. JMH benchmarks results are within the error margin so we can assume that this does not change the performance characteristics for the typical use case in Spring Framework. Fixes gh-29520 |
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