linux

iv/linux

History

Dietmar Eggemann 2d69f68ad4 cgroup/cpuset: Free DL BW in case can_attach() fails

commit 2ef269ef1ac006acf974793d975539244d77b28f upstream.

cpuset_can_attach() can fail. Postpone DL BW allocation until all tasks
have been checked. DL BW is not allocated per-task but as a sum over
all DL tasks migrating.

If multiple controllers are attached to the cgroup next to the cpuset
controller a non-cpuset can_attach() can fail. In this case free DL BW
in cpuset_cancel_attach().

Finally, update cpuset DL task count (nr_deadline_tasks) only in
cpuset_attach().

Suggested-by: Waiman Long <longman@redhat.com>
Signed-off-by: Dietmar Eggemann <dietmar.eggemann@arm.com>
Signed-off-by: Juri Lelli <juri.lelli@redhat.com>
Reviewed-by: Waiman Long <longman@redhat.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
[ Fix conflicts in kernel/cgroup/cpuset.c due to new code being applied
  that is not applicable on this branch. Reject new code. ]
Signed-off-by: Qais Yousef (Google) <qyousef@layalina.io>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2023-08-30 16:23:18 +02:00

cgroup-internal.h

memcg: fix possible use-after-free in memcg_write_event_control()

2022-12-14 11:31:57 +01:00

cgroup-v1.c

cgroup: Add missing cpus_read_lock() to cgroup_attach_task_all()

2022-09-23 14:17:00 +02:00

cgroup.c

sched/cpuset: Keep track of SCHED_DEADLINE task in cpusets

2023-08-30 16:23:17 +02:00

cpuset.c

cgroup/cpuset: Free DL BW in case can_attach() fails