Re: [PATCH 4/5] mm: rework non-root kmem_cache lifecycle management

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To: Christopher Lameter <cl@xxxxxxxxx>
Subject: Re: [PATCH 4/5] mm: rework non-root kmem_cache lifecycle management
From: Roman Gushchin <guro@xxxxxx>
Date: Thu, 18 Apr 2019 18:04:27 +0000
Accept-language: en-US
Cc: Roman Gushchin <guroan@xxxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, "linux-mm@xxxxxxxxx" <linux-mm@xxxxxxxxx>, "linux-kernel@xxxxxxxxxxxxxxx" <linux-kernel@xxxxxxxxxxxxxxx>, Kernel Team <Kernel-team@xxxxxx>, Johannes Weiner <hannes@xxxxxxxxxxx>, Michal Hocko <mhocko@xxxxxxxxxx>, Rik van Riel <riel@xxxxxxxxxxx>, "david@xxxxxxxxxxxxx" <david@xxxxxxxxxxxxx>, Pekka Enberg <penberg@xxxxxxxxxx>, Vladimir Davydov <vdavydov.dev@xxxxxxxxx>, "cgroups@xxxxxxxxxxxxxxx" <cgroups@xxxxxxxxxxxxxxx>
In-reply-to: <0100016a30a83bcf-7f99039c-77ec-4c48-a1c4-92e398f8f185-000000@email.amazonses.com>
References: <20190417215434.25897-1-guro@fb.com> <20190417215434.25897-5-guro@fb.com> <0100016a30a83bcf-7f99039c-77ec-4c48-a1c4-92e398f8f185-000000@email.amazonses.com>

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!

References:
- [PATCH 0/5] mm: reparent slab memory on cgroup removal
  - From: Roman Gushchin
- [PATCH 4/5] mm: rework non-root kmem_cache lifecycle management
  - From: Roman Gushchin
- Re: [PATCH 4/5] mm: rework non-root kmem_cache lifecycle management
  - From: Christopher Lameter

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