linux-kernel - Re: [PATCH] memcg: Add kmem.slabinfo to v2 for debugging purpose

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Message-Id: <20190626152553.6f9178a0361e699a5d53e360@linux-foundation.org>
Date:   Wed, 26 Jun 2019 15:25:53 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Waiman Long <longman@...hat.com>
Cc:     Johannes Weiner <hannes@...xchg.org>,
        Michal Hocko <mhocko@...nel.org>,
        Vladimir Davydov <vdavydov.dev@...il.com>,
        Tejun Heo <tj@...nel.org>, linux-kernel@...r.kernel.org,
        cgroups@...r.kernel.org, linux-mm@...ck.org,
        Shakeel Butt <shakeelb@...gle.com>
Subject: Re: [PATCH] memcg: Add kmem.slabinfo to v2 for debugging purpose

On Wed, 26 Jun 2019 12:56:14 -0400 Waiman Long <longman@...hat.com> wrote:

> With memory cgroup v1, there is a kmem.slabinfo file that can be
> used to view what slabs are allocated to the memory cgroup. There
> is currently no such equivalent in memory cgroup v2. This file can
> be useful for debugging purpose.
> 
> This patch adds an equivalent kmem.slabinfo to v2 with the caveat that
> this file will only show up as ".__DEBUG__.memory.kmem.slabinfo" when the
> "cgroup_debug" parameter is specified in the kernel boot command line.
> This is to avoid cluttering the cgroup v2 interface with files that
> are seldom used by end users.
>
> ...
>
> mm/memcontrol.c | 16 ++++++++++++++++
> 1 file changed, 16 insertions(+)

A change to the kernel's user interface triggers a change to the
kernel's user interface documentation.  This should be automatic by
now :(