How do I trace jbd2 task activity?

Solution In Progress - Updated -

Issue

  • On one of our Virtual machines running on HyperV platform we encouter high journal writes up to 50Mb/sec.
  • I have enabled debugfs and enabled tracing. It did not give me the output I really wanted.
  • I want to know if its possible to "strace" the journal process. Actually I want to know which files are being written to the journal. (I know strace is not possible on kernel processes)

Environment

  • Red Hat Enterprise Linux 6.5
  • JBD2 journal task

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