Re: [PATCH v5 1/7] mm: postpone kmem_cache memcg pointer initialization to memcg_link_cache()

[Johannes Weiner]

On Tue, May 21, 2019 at 01:07:29PM -0700, Roman Gushchin wrote:
> Initialize kmem_cache->memcg_params.memcg pointer in
> memcg_link_cache() rather than in init_memcg_params().
> 
> Once kmem_cache will hold a reference to the memory cgroup,
> it will simplify the refcounting.
> 
> For non-root kmem_caches memcg_link_cache() is always called
> before the kmem_cache becomes visible to a user, so it's safe.
> 
> Signed-off-by: Roman Gushchin <guro@xxxxxx>
> Reviewed-by: Shakeel Butt <shakeelb@xxxxxxxxxx>

Acked-by: Johannes Weiner <hannes@xxxxxxxxxxx>