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 <khlebni...@yandex-team.ru>
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
