From mboxrd@z Thu Jan  1 00:00:00 1970
From: Roman Gushchin <guro@fb.com>
Subject: Re: [PATCH 4/5] mm: rework non-root kmem_cache lifecycle management
Date: Thu, 18 Apr 2019 18:04:27 +0000
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To: Christopher Lameter <cl@linux.com>
Cc: Roman Gushchin <guroan@gmail.com>, Andrew Morton <akpm@linux-foundation.org>, "linux-mm@kvack.org" <linux-mm@kvack.org>, "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>, Kernel Team <Kernel-team@fb.com>, Johannes Weiner <hannes@cmpxchg.org>, Michal Hocko <mhocko@kernel.org>, Rik van Riel <riel@surriel.com>, "david@fromorbit.com" <david@fromorbit.com>, Pekka Enberg <penberg@kernel.org>, Vladimir Davydov <vdavydov.dev@gmail.com>, "cgroups@vger.kernel.org" <cgroups@vger.kernel.org>

On Thu, Apr 18, 2019 at 01:34:52PM +0000, Christopher Lameter wrote:
> On Wed, 17 Apr 2019, Roman Gushchin wrote:
>=20
> > 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.
>=20
> Ok you are freeing one word in the page struct that can be used for other
> purposes now?
>=20

Looks so!