public long currentAllocatedMemory() {
    return bytesInUse.get();
  }
Gets the total amount of memory in bytes allocated for all values for this PR in this VM. This
is the current memory (MB) watermark for data in this PR.

If eviction to disk is enabled, this does not reflect the size of entries on disk.

@return the total memory size in bytes for all the Map's values
geode-core/src/main/java/org/apache/geode/internal/cache/PartitionedRegionDataStore.java