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Date:   Thu, 18 Apr 2019 13:34:52 +0000
From:   Christopher Lameter <cl@linux.com>
To:     Roman Gushchin <guroan@gmail.com>
cc:     Andrew Morton <akpm@linux-foundation.org>, linux-mm@kvack.org,
        linux-kernel@vger.kernel.org, kernel-team@fb.com,
        Johannes Weiner <hannes@cmpxchg.org>,
        Michal Hocko <mhocko@kernel.org>,
        Rik van Riel <riel@surriel.com>, david@fromorbit.com,
        Pekka Enberg <penberg@kernel.org>,
        Vladimir Davydov <vdavydov.dev@gmail.com>,
        cgroups@vger.kernel.org, Roman Gushchin <guro@fb.com>
Subject: Re: [PATCH 4/5] mm: rework non-root kmem_cache lifecycle
 management
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On Wed, 17 Apr 2019, Roman Gushchin wrote:

> Let's make every page to hold a reference to the kmem_cache (we
> already have a stable pointer), and make kmem_caches to hold a single
> reference to the memory cgroup.

Ok you are freeing one word in the page struct that can be used for other
purposes now?