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With its -d option, pidstat can report I/O statistics, providing that you have a recent Linux kernel (2.6.20+) with the option CONFIG_TASK_IO_ACCOUNTING compiled in.
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userland htop or pidstat require the necessary kconf set http://sebastien.godard.pagesperso-orange.fr/tutorial.html
kconf causality https://github.com/torvalds/linux/blob/master/init/Kconfig#L471
CONFIG_TASKSTATS
|> CONFIG_TASK_XACCT
|> CONFIG_TASK_IO_ACCOUNTING
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