On Mon, Feb 04, 2019 at 01:17:43PM +0300, Konstantin Khlebnikov wrote: > This is useful for moving journal thread into cgroup or > for tracing it with ftrace/perf/blktrace. > > For now the only way is `pgrep jbd2/$DISK` but this is not reliable: > name may be longer than "comm" limit and any task could mock it. > > Attribute shows pid in current pid-namespace or 0 if task is unreachable. > > Signed-off-by: Konstantin Khlebnikov <khlebnikov@xxxxxxxxxxxxxx> Thanks, applied with one change; if the file system does not have a journal, reading the /sys/fs/ext4/<disk>/journal_task will return "<none>" instead of returning a ESRCH error. - Ted
