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[195.135.220.15]) by mx.google.com with ESMTPS id i6si1813164edd.252.2019.04.10.12.54.49 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 10 Apr 2019 12:54:49 -0700 (PDT) Received-SPF: softfail (google.com: domain of transitioning mhocko@kernel.org does not designate 195.135.220.15 as permitted sender) client-ip=195.135.220.15; Authentication-Results: mx.google.com; spf=softfail (google.com: domain of transitioning mhocko@kernel.org does not designate 195.135.220.15 as permitted sender) smtp.mailfrom=mhocko@kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=kernel.org X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx1.suse.de (Postfix) with ESMTP id EC13CAC31; Wed, 10 Apr 2019 19:54:47 +0000 (UTC) Date: Wed, 10 Apr 2019 21:54:43 +0200 From: Michal Hocko To: Waiman Long Cc: Tejun Heo , Li Zefan , Johannes Weiner , Jonathan Corbet , Vladimir Davydov , linux-kernel@vger.kernel.org, cgroups@vger.kernel.org, linux-doc@vger.kernel.org, linux-mm@kvack.org, Andrew Morton , Roman Gushchin , Shakeel Butt , Kirill Tkhai , Aaron Lu Subject: Re: [RFC PATCH 0/2] mm/memcontrol: Finer-grained memory control Message-ID: <20190410195443.GL10383@dhcp22.suse.cz> References: <20190410191321.9527-1-longman@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20190410191321.9527-1-longman@redhat.com> User-Agent: Mutt/1.10.1 (2018-07-13) X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Wed 10-04-19 15:13:19, Waiman Long wrote: > The current control mechanism for memory cgroup v2 lumps all the memory > together irrespective of the type of memory objects. However, there > are cases where users may have more concern about one type of memory > usage than the others. > > We have customer request to limit memory consumption on anonymous memory > only as they said the feature was available in other OSes like Solaris. Please be more specific about a usecase. > To allow finer-grained control of memory, this patchset 2 new control > knobs for memory controller: > - memory.subset.list for specifying the type of memory to be under control. > - memory.subset.high for the high limit of memory consumption of that > memory type. Please be more specific about the semantic. I am really skeptical about this feature to be honest, though. > For simplicity, the limit is not hierarchical and applies to only tasks > in the local memory cgroup. This is a no-go to begin with. > Waiman Long (2): > mm/memcontrol: Finer-grained control for subset of allocated memory > mm/memcontrol: Add a new MEMCG_SUBSET_HIGH event > > Documentation/admin-guide/cgroup-v2.rst | 35 +++++++++ > include/linux/memcontrol.h | 8 ++ > mm/memcontrol.c | 100 +++++++++++++++++++++++- > 3 files changed, 142 insertions(+), 1 deletion(-) > > -- > 2.18.1 -- Michal Hocko SUSE Labs