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

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Message-ID: <20191003104741.GB6678@blackbody.suse.cz>
Date:   Thu, 3 Oct 2019 12:47:41 +0200
From:   Michal Koutný <mkoutny@...e.com>
To:     Suleiman Souhlal <suleiman@...gle.com>
Cc:     Roman Gushchin <guro@...com>, Johannes Weiner <hannes@...xchg.org>,
        Kernel Team <Kernel-team@...com>,
        Vladimir Davydov <vdavydov.dev@...il.com>,
        Shakeel Butt <shakeelb@...gle.com>,
        Michal Hocko <mhocko@...nel.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        Waiman Long <longman@...hat.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH RFC 00/14] The new slab memory controller

On Wed, Oct 02, 2019 at 10:00:07PM +0900, Suleiman Souhlal <suleiman@...gle.com> wrote:
> kmem.slabinfo has been absolutely invaluable for debugging, in my experience.
> I am however not aware of any automation based on it.
My experience is the same. However, the point is that this has been
exposed since ages, so the safe assumption is that there may be users.

> Maybe it might be worth adding it to cgroup v2 and have a CONFIG
> option to enable it?
I don't think v2 file is necessary given the cost of obtaining the
information. But I concur the idea of making the per-object tracking
switchable at boot time or at least CONFIGurable.

Michal

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