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find ount what [flush-8:0] is writing

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http://unix.stackexchange.com – Using iotop, I found out that [flush-8:0] is doing a lot of hard disk activity, which explains the annoying slowdowns. However, I can't figure out what's the actual cause behind this flushing. No other process seems to be doing inordinate amounts of IO. And you can't strace a kernel task. I've also enabled IO debugging (via echo 1 >/proc/sys/vm/block_dump), but it gives me block numbers on a JFS filesystem, and I have no idea how to translate those into filenames (just try a web search to see what you get). I actually have a suspect, a java process that seems to cause hard disk activity w (HowTos)