private EvictionCounters getLRUStats(Region region) {
    return ((LocalRegion) region).getEvictionController().getCounters();
  }
Do not change the value OP_COUNT = 400 The test case is dependent on this value.
geode-core/src/integrationTest/java/org/apache/geode/internal/cache/diskPerf/DiskRegOverflowSyncJUnitPerformanceTest.java