On Thursday, 12 October 2017 16:30:09 CEST Richard W.M. Jones wrote:
 After this change the debugging output looks like this:
 
   guestfsd: enter: mount (0x1) request length 64 bytes
   commandrvf: stdout=n stderr=y flags=0x0
   commandrvf: udevadm --debug settle -E /dev/sda1
   calling: settle
   command: mount '/dev/sda1' '/sysroot//'
   [    0.951731] EXT4-fs (sda1): mounting ext2 file system using the ext4 subsystem
   [    0.954585] EXT4-fs (sda1): mounted filesystem without journal. Opts: (null)
   guestfsd: leave: mount (0x1) took 0.01 secs
   guestfsd: enter: touch (0x3) request length 52 bytes
   guestfsd: leave: touch (0x3) took 0.00 secs
 --- 
LGTM.
Maybe a small visual improvements could be replacing the "enter" and
"leave" texts with ASCII arrows, e.g. "<="/"<-" and
"=>"/"->":
  guestfsd: [->] touch (0x3) request length 52 bytes
  guestfsd: [<-] touch (0x3) took 0.00 secs
This may make the output slightly more eye-friendly, but YMMV.
-- 
Pino Toscano