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iotop suddenly giving 'CONFIG_TASK_DELAY_ACCT not enabled in kernel, cannot determine SWAPIN and IO %' message

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http://serverfault.com – I was using rsync on a server (CentOS 6.0) to copy lot of Gb of data on a separate disk than the one on which linux was installed. Just to see how much Disk I/O was rsync taking, cause copy was happening slow, I gave the command with the pids of rsync command: iotop --pid=6088 --pid=6089 --pid=6090 It was working fine, and I stopped it. After some time when I again gave the same command, iotop started, but instead of showing me the process details, in the bottom it gave the message: "CONFIG_TASK_DELAY_ACCT not enabled in kernel, cannot determine SWAPIN and IO %" Then I gave the command "i (HowTos)