Hi,
before I go crazy...one question:
On my BBB the file
/sys/fs/ext4/mmcblk0p2/session_write_kbytes
reports a steadily increasing count to writes to
mmcblk0p2 (root).
Regardsless what I trying to identify the process...I cant
find it. There seems no file be written and no task does
any I/O. For testing I stopped swap space...no effect.
Would it be possible, that writes to FIFOs and PIPEs, which
incarnations are on that block device, are counted via
session_write_kbytes...even if the bytes are not physically written
to that device?
Any other idea?
Thank you very much for any enlightement in advance! 
Best regards,
Meino