tree 2193f97c46fcf7e50928259798fd5e466b5892cb
parent 973f5f1a0d64a0faa49a22929520281c786fbd24
author buyingyi <buyingyi@gmail.com> 1376608520 -0700
committer buyingyi <buyingyi@gmail.com> 1376608520 -0700

clean up the checkpointing control