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(parent: 231fe82) | patch
ext4: add sysfs attr /sys/fs/ext4/<disk>/journal_task
authorKonstantin Khlebnikov <khlebnikov@yandex-team.ru>
Thu, 21 Feb 2019 16:49:27 +0000 (11:49 -0500)
committerTheodore Ts'o <tytso@mit.edu>
Thu, 21 Feb 2019 16:49:27 +0000 (11:49 -0500)
commitbc1d69d6151f1911ecb120a8dbd65e47210b7a72
tree894a447e6f9669653f4668ab3f791534d6b5f460tree | snapshot
parent231fe82b5609c5d679f81073739c6132aaf166eacommit | diff
ext4: add sysfs attr /sys/fs/ext4/<disk>/journal_task

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@yandex-team.ru>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Documentation/ABI/testing/sysfs-fs-ext4 diff | blob | history
fs/ext4/sysfs.c diff | blob | history
Domain: System / Kernel;