How to find out, what "pdflush" is working on

[Frank Ch. Eigler]

> [...]
>> Is there a way to find out what a certain instance of "pdflush" is
>> working on? Like which block-device or which fliesystem it is
>> writing to? [...]

Something based upon the following systemtap script may help:

probe kernel.function("__writeback_single_inode") {
  if (execname() == "pdflush")
     printf("pdflush %d writeback bdev %x inode %x\n", tid(), $inode->i_rdev, $inode->i_ino) 
}

Other fields are available as $inode->FOO.

- FChE