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Date:   Tue, 28 May 2019 17:56:37 -0400
From:   Johannes Weiner <hannes@cmpxchg.org>
To:     Roman Gushchin <guro@fb.com>
Cc:     Andrew Morton <akpm@linux-foundation.org>, linux-mm@kvack.org,
        linux-kernel@vger.kernel.org, kernel-team@fb.com,
        Michal Hocko <mhocko@kernel.org>,
        Rik van Riel <riel@surriel.com>,
        Shakeel Butt <shakeelb@google.com>,
        Christoph Lameter <cl@linux.com>,
        Vladimir Davydov <vdavydov.dev@gmail.com>,
        cgroups@vger.kernel.org, Waiman Long <longman@redhat.com>
Subject: Re: [PATCH v5 1/7] mm: postpone kmem_cache memcg pointer
 initialization to memcg_link_cache()
Message-ID: <20190528215637.GA26614@cmpxchg.org>
References: <20190521200735.2603003-1-guro@fb.com>
 <20190521200735.2603003-2-guro@fb.com>
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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@fb.com>
> Reviewed-by: Shakeel Butt <shakeelb@google.com>

Acked-by: Johannes Weiner <hannes@cmpxchg.org>