Preparation 
  Connect to the desired database
    db2 connect to <dbname>
  Create stored procedures
    db2 -td@ -f db2perf_utils.db2
    db2 -td@ -f db2perf_bp.db2
  Turn on bufferpool monitoring by default with DFT_MON_BUFPOOL dbm config switch
Use
  Connect to the desired database
    db2 connect to <dbname>
  Call stored procedure & examine results
    db2 -call db2perf_bufferpool
  Update configuration based on results, if necessary


For more information, see db2perf.pdf
