Why is most the of disk IO attributed to jbd2 and not to the process that is actually using the IO?

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                          When monitoring disk IO, most of the IO is attributed to jbd2, while the original process that caused the high IO is attributed a much lower IO percentage. Why?

Here's iotop's example output (other processes with IO<1% omitted):

Asked by Sparkler (1109 rep)

Feb 8, 2017, 11:24 PM
Last activity: Jun 24, 2025, 08:01 AM

Why is most the of disk IO attributed to jbd2 and not to the process that is actually using the IO?

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