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cgroup: disallow disabled controllers on the default hierarchy 

After booting with cgroup_disable=memory, I still saw memcg files
in the default hierarchy, and I can write to them, though it won't
take effect.

  # dmesg
  ...
  Disabling memory control group subsystem
  ...
  # mount -t cgroup -o __DEVEL__sane_behavior xxx /cgroup
  # ls /cgroup
  ...
  memory.failcnt                   memory.move_charge_at_immigrate
  memory.force_empty               memory.numa_stat
  memory.limit_in_bytes            memory.oom_control
  ...
  # cat /cgroup/memory.usage_in_bytes
  0

tj: Minor comment update.

Signed-off-by: Li Zefan <lizefan@huawei.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Li Zefan 2014-06-05 17:16:30 +08:00 committed by Tejun Heo
parent 1f779fb28a
commit c731ae1d0f
1 changed files with 9 additions and 5 deletions
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14
kernel/cgroup.c
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@ -3069,6 +3069,9 @@ int cgroup_add_cftypes(struct cgroup_subsys *ss, struct cftype *cfts)
{
int ret;
if (ss->disabled)
return 0;
if (!cfts || cfts[0].name[0] == '\0')
return 0;
@ -4678,8 +4681,6 @@ static void __init cgroup_init_subsys(struct cgroup_subsys *ss, bool early)
BUG_ON(online_css(css));
cgrp_dfl_root.subsys_mask |= 1 << ss->id;
mutex_unlock(&cgroup_mutex);
}
@ -4758,11 +4759,14 @@ int __init cgroup_init(void)
&cgrp_dfl_root.cgrp.e_csets[ssid]);
/*
* cftype registration needs kmalloc and can't be done
* during early_init. Register base cftypes separately.
* Setting dfl_root subsys_mask needs to consider the
* disabled flag and cftype registration needs kmalloc,
* both of which aren't available during early_init.
*/
if (ss->base_cftypes)
if (!ss->disabled) {
cgrp_dfl_root.subsys_mask |= 1 << ss->id;
WARN_ON(cgroup_add_cftypes(ss, ss->base_cftypes));
}
}
cgroup_kobj = kobject_create_and_add("cgroup", fs_kobj);