linux-kernel - Re: [PATCH 4/5] mm: rework non-root kmem

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Message-ID: <20190418180421.GA11008@tower.DHCP.thefacebook.com>
Date:   Thu, 18 Apr 2019 18:04:27 +0000
From:   Roman Gushchin <guro@...com>
To:     Christopher Lameter <cl@...ux.com>
CC:     Roman Gushchin <guroan@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Kernel Team <Kernel-team@...com>,
        Johannes Weiner <hannes@...xchg.org>,
        Michal Hocko <mhocko@...nel.org>,
        Rik van Riel <riel@...riel.com>,
        "david@...morbit.com" <david@...morbit.com>,
        Pekka Enberg <penberg@...nel.org>,
        Vladimir Davydov <vdavydov.dev@...il.com>,
        "cgroups@...r.kernel.org" <cgroups@...r.kernel.org>
Subject: Re: [PATCH 4/5] mm: rework non-root kmem_cache lifecycle management

On Thu, Apr 18, 2019 at 01:34:52PM +0000, Christopher Lameter wrote:
> 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?
> 

Looks so!