951724: who takes lots of time

1. functions consuming lots of time on writing node

• user process writing

! 12070.36 us |        } /* __ocfs2_cluster_lock */
! 12086.88 us |      } /* ocfs2_inode_lock_full_nested */
! 12597.91 us |    } /* ocfs2_write_begin */       
! 12654.60 us |  } /* ocfs2_file_aio_write */

• ocfs2cm
  

! 9007.779 us |  } /* ocfs2_commit_cache */

  2. functions consuming lots of time on reading node

! 37082.67 us |  } /* ocfs2_file_aio_read */
! 11116.05 us |        } /* __ocfs2_cluster_lock */
! 11139.69 us |      } /* ocfs2_inode_lock_full_nested */
! 11169.11 us |    } /* ocfs2_inode_lock_atime *