private void fillFragments() {
    if (!validateMemoryWithFill) {
      return;
    }
    for (Fragment fragment : fragmentList) {
      fragment.fill();
    }
  }
Fills all fragments with a fill used for data integrity validation if fill validation is
enabled.
geode-core/src/main/java/org/apache/geode/internal/offheap/FreeListManager.java