linux-kernel - Re: [PATCH RFC 00/14] The new slab memory controller

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Message-ID: <20191001151202.GA6678@blackbody.suse.cz>
Date:   Tue, 1 Oct 2019 17:12:02 +0200
From:   Michal Koutný <mkoutny@...e.com>
To:     Roman Gushchin <guro@...com>
Cc:     linux-mm@...ck.org, Michal Hocko <mhocko@...nel.org>,
        Johannes Weiner <hannes@...xchg.org>,
        linux-kernel@...r.kernel.org, kernel-team@...com,
        Shakeel Butt <shakeelb@...gle.com>,
        Vladimir Davydov <vdavydov.dev@...il.com>,
        Waiman Long <longman@...hat.com>
Subject: Re: [PATCH RFC 00/14] The new slab memory controller

On Thu, Sep 05, 2019 at 02:45:44PM -0700, Roman Gushchin <guro@...com> wrote:
> Roman Gushchin (14):
> [...]
>   mm: memcg/slab: use one set of kmem_caches for all memory cgroups
From that commit's message:

> 6) obsoletes kmem.slabinfo cgroup v1 interface file, as there are
>   no per-memcg kmem_caches anymore (empty output is printed)

The empty file means no allocations took place in the particular cgroup.
I find this quite a surprising change for consumers of these stats.

I understand obtaining the same data efficiently from the proposed
structures is difficult, however, such a change should be avoided. (In
my understanding, obsoleted file ~ not available in v2, however, it
should not disappear from v1.)

Michal

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