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| author | Mike Galbraith <mgalbraith@suse.de> | 2012-04-21 09:13:46 +0200 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2012-04-23 11:03:51 -0700 |
| commit | c4c27fbdda4e8ba87806c415b6d15266b07bce4b (patch) | |
| tree | e532518e0942a2562642744103eb64554c8abbda /Documentation/cgroups | |
| parent | 86f82d561864e902c70282b6f17cf590c0f34691 (diff) | |
| download | op-kernel-dev-c4c27fbdda4e8ba87806c415b6d15266b07bce4b.zip op-kernel-dev-c4c27fbdda4e8ba87806c415b6d15266b07bce4b.tar.gz | |
cgroups: disallow attaching kthreadd or PF_THREAD_BOUND threads
Allowing kthreadd to be moved to a non-root group makes no sense, it being
a global resource, and needlessly leads unsuspecting users toward trouble.
1. An RT workqueue worker thread spawned in a task group with no rt_runtime
allocated is not schedulable. Simple user error, but harmful to the box.
2. A worker thread which acquires PF_THREAD_BOUND can never leave a cpuset,
rendering the cpuset immortal.
Save the user some unexpected trouble, just say no.
Signed-off-by: Mike Galbraith <mgalbraith@suse.de>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Li Zefan <lizefan@huawei.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Diffstat (limited to 'Documentation/cgroups')
0 files changed, 0 insertions, 0 deletions
