Messages in this thread Patch in this message |  | | | Date | Fri, 13 Feb 2015 11:19:49 +0800 | | From | Zefan Li <> | | Subject | [PATCH 1/3] cpuset: initialize effective masks when clone_children is enabled |
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If clone_children is enabled, effective masks won't be initialized due to the bug:
# mount -t cgroup -o cpuset xxx /mnt # echo 1 > cgroup.clone_children # mkdir /mnt/tmp # cat /mnt/tmp/ # cat cpuset.effective_cpus
# cat cpuset.cpus 0-15
And then this cpuset won't constrain the tasks in it.
Either the bug or the fix has no effect on unified hierarchy, as there's no clone_chidren flag there any more.
Reported-by: Christian Brauner <christianvanbrauner@gmail.com> Reported-by: Serge Hallyn <serge.hallyn@ubuntu.com> Cc: <stable@vger.kernel.org> # 3.17+ Signed-off-by: Zefan Li <lizefan@huawei.com> --- kernel/cpuset.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/kernel/cpuset.c b/kernel/cpuset.c index 64b257f..7e9d711 100644 --- a/kernel/cpuset.c +++ b/kernel/cpuset.c @@ -1992,7 +1992,9 @@ static int cpuset_css_online(struct cgroup_subsys_state *css) spin_lock_irq(&callback_lock); cs->mems_allowed = parent->mems_allowed; + cs->effective_mems = parent->mems_allowed; cpumask_copy(cs->cpus_allowed, parent->cpus_allowed); + cpumask_copy(cs->effective_cpus, parent->cpus_allowed); spin_unlock_irq(&callback_lock); out_unlock: mutex_unlock(&cpuset_mutex); -- 1.8.0.2
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