On Mon 01-08-16 16:26:26, Vladimir Davydov wrote:
[...]
> static struct mem_cgroup *mem_cgroup_id_get_active(struct mem_cgroup *memcg)
> {
> - while (!atomic_inc_not_zero(&memcg->id.ref))
> + while (!atomic_inc_not_zero(&memcg->id.ref)) {
> + VM_BUG_ON(mem_cgroup_is_root(memcg));
> memcg = parent_mem_cgroup(memcg);
> + }
why is this BUG_ON ok? What if the root.use_hierarchy=true?
> return memcg;
> }
--
Michal Hocko
SUSE Labs
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