linux-kernel - Re: [PATCH v5 7/7] mm: fix /proc/kpagecgroup interface for slab pages

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Date:   Tue, 28 May 2019 20:38:16 +0300
From:   Vladimir Davydov <vdavydov.dev@...il.com>
To:     Roman Gushchin <guro@...com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, kernel-team@...com,
        Johannes Weiner <hannes@...xchg.org>,
        Michal Hocko <mhocko@...nel.org>,
        Rik van Riel <riel@...riel.com>,
        Shakeel Butt <shakeelb@...gle.com>,
        Christoph Lameter <cl@...ux.com>, cgroups@...r.kernel.org,
        Waiman Long <longman@...hat.com>
Subject: Re: [PATCH v5 7/7] mm: fix /proc/kpagecgroup interface for slab pages

On Tue, May 21, 2019 at 01:07:35PM -0700, Roman Gushchin wrote:
> Switching to an indirect scheme of getting mem_cgroup pointer for
> !root slab pages broke /proc/kpagecgroup interface for them.
> 
> Let's fix it by learning page_cgroup_ino() how to get memcg
> pointer for slab pages.
> 
> Reported-by: Shakeel Butt <shakeelb@...gle.com>
> Signed-off-by: Roman Gushchin <guro@...com>
> Reviewed-by: Shakeel Butt <shakeelb@...gle.com>
> ---
>  mm/memcontrol.c  |  5 ++++-
>  mm/slab.h        | 25 +++++++++++++++++++++++++
>  mm/slab_common.c |  1 +
>  3 files changed, 30 insertions(+), 1 deletion(-)

What about mem_cgroup_from_kmem, see mm/list_lru.c?
Shouldn't we fix it, too?