What does the number on the end of the [flush] thread mean?

Solution Unverified - Updated -

Issue

  • ps command shows some processes named like [flush-x:x]
# ps aux | grep flush
root       531  0.0  0.0      0     0 ?        S    Mar06   0:00 [flush-253:1]
root      7479  0.0  0.0      0     0 ?        S    Mar06   0:00 [flush-253:2]
  • What do those processes actually indicate and represent?

Environment

  • Red Hat Enterprise Linux 6

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