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Subject: Re: [RFC PATCH 0/2] mm/memcontrol: Finer-grained memory control
To:     Waiman Long <longman@redhat.com>, Tejun Heo <tj@kernel.org>,
        Li Zefan <lizefan@huawei.com>,
        Johannes Weiner <hannes@cmpxchg.org>,
        Jonathan Corbet <corbet@lwn.net>,
        Michal Hocko <mhocko@kernel.org>,
        Vladimir Davydov <vdavydov.dev@gmail.com>
Cc:     linux-kernel@vger.kernel.org, cgroups@vger.kernel.org,
        linux-doc@vger.kernel.org, linux-mm@kvack.org,
        Andrew Morton <akpm@linux-foundation.org>,
        Roman Gushchin <guro@fb.com>,
        Shakeel Butt <shakeelb@google.com>,
        Aaron Lu <aaron.lu@intel.com>, aryabinin@virtuozzo.com
References: <20190410191321.9527-1-longman@redhat.com>
From:   Kirill Tkhai <ktkhai@virtuozzo.com>
Message-ID: <1b6ee304-6176-15a0-c3fa-0b59cdd60085@virtuozzo.com>
Date:   Thu, 11 Apr 2019 17:37:51 +0300
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On 10.04.2019 22:13, 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.
> 
> 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.
> 
> For simplicity, the limit is not hierarchical and applies to only tasks
> in the local memory cgroup.
> 
> 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(-)

CC Andrey.

In Virtuozzo kernel we have similar functionality for limitation of page cache in a cgroup:

https://github.com/OpenVZ/vzkernel/commit/8ceef5e0c07c7621fcb0e04ccc48a679dfeec4a4