cgroup/cpuset: Add cpuset_can_fork() and cpuset_cancel_fork() methods

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In the case of CLONE_INTO_CGROUP, not all cpusets are ready to accept
new tasks. It is too late to check that in cpuset_fork(). So we need
to add the cpuset_can_fork() and cpuset_cancel_fork() methods to
pre-check it before we can allow attachment to a different cpuset.

We also need to set the attach_in_progress flag to alert other code
that a new task is going to be added to the cpuset.

Fixes: ef2c41cf38 ("clone3: allow spawning processes into cgroups")
Suggested-by: Michal Koutný <mkoutny@suse.com>
Signed-off-by: Waiman Long <longman@redhat.com>
Cc: stable@vger.kernel.org # v5.7+
Signed-off-by: Tejun Heo <tj@kernel.org>

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Waiman Long 2023-04-11 09:35:59 -04:00 • committed by Tejun Heo

parent 42a11bf5c5

commit eee8785379

1 changed files with 86 additions and 11 deletions

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kernel/cgroup/cpuset.c

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