code: @Override
      public void purgeZeroObject(Long bucketId, Long objectId, AllocationPoint point, boolean copyback) {
          forget(point, AllocationStatus.HOST);
  
          flowController.waitTillReleased(point);
  
          // we call for caseless deallocation here
          //JCudaDriver.cuCtxSetCurrent(contextPool.getCuContextForDevice(0));
          free(point, AllocationStatus.HOST);
  
          point.setAllocationStatus(AllocationStatus.DEALLOCATED);
  
          long reqMem = AllocationUtils.getRequiredMemory(point.getShape()) * -1;
          zeroUseCounter.addAndGet(reqMem);
      }
docs: This method explicitly removes object from zero-copy memory.
  
  @param bucketId
  @param objectId
  @param copyback  if TRUE, corresponding memory block on JVM side will be updated, if FALSE - memory will be just discarded