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Date:   Fri, 25 Jun 2021 17:55:22 +0200
From:   Michal =?iso-8859-1?Q?Koutn=FD?= <mkoutny@suse.com>
To:     Philipp Hahn <pmhahn+lkml@pmhahn.de>
Cc:     "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "cgroups@vger.kernel.org" <cgroups@vger.kernel.org>
Subject: Re: Prevent inode/dentry trashing?
Message-ID: <YNX8anv2yCnkVPXy@blackbook>
References: <ce330972-78e6-4347-9735-72ee7bb21ef5@pmhahn.de>
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Hello Phillip.

On Mon, Jun 07, 2021 at 02:39:35PM +0200, Philipp Hahn <pmhahn+lkml@pmhahn.=
de> wrote:
> The trashed caches affect all other processes running in parallel or the
> first processes started each morning.
>=20
> Is it possible to prevent inode/dentry trashing for example by limiting t=
he
> cache per process(-group)?

Yes. Unless you have disabled it with CONFIG_MEMCG_KMEM or
cgroup.memory=3Dnokmem, dentries and inodes are charged to respective
cgroups. And you can limit overall memory of a cgroup, see
memory.{max,high} attributes. (You suggest this inode/dentry consumption
is dominant enough to affect other jobs, so the limit would keep it
constrained as you intend).

HTH,
Michal

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