On 05/30/2012 05:37 PM, Frederic Weisbecker wrote:

Right. __mem_cgroup_get_kmem_cache() fetches the memcg of the owner
and calls memcg_create_cache_enqueue() which does css_tryget(&memcg->css).
After this tryget I think you're fine. And in-between you're safe against
css_set removal due to rcu_read_lock().

I'm less clear with __mem_cgroup_new_kmem_page() though...

That one does not get memcg->css but it does call mem_cgroup_get(), that 
does prevent against the memcg structure being freed, which I believe to 
be good enough.

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