From mboxrd@z Thu Jan 1 00:00:00 1970 From: Michal Hocko Subject: Re: [RFC PATCH 0/2] mm/memcontrol: Finer-grained memory control Date: Wed, 10 Apr 2019 21:54:43 +0200 Message-ID: <20190410195443.GL10383@dhcp22.suse.cz> References: <20190410191321.9527-1-longman@redhat.com> Mime-Version: 1.0 Return-path: Content-Disposition: inline In-Reply-To: <20190410191321.9527-1-longman@redhat.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit 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 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