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

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commit 2ef269ef1a 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>
[ Conflict in kernel/cgroup/cpuset.c due to pulling extra neighboring
  functions that are not applicable on this branch. ]
Signed-off-by: Qais Yousef (Google) <qyousef@layalina.io>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

This commit is contained in:

Dietmar Eggemann 2023-08-20 16:22:58 +01:00 • committed by Greg Kroah-Hartman

parent ffff4fc4ba

commit 3cb86cc565

3 changed files with 50 additions and 20 deletions

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2

include/linux/sched.h

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51

kernel/cgroup/cpuset.c

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17

kernel/sched/core.c

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