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Date:   Thu, 11 Apr 2019 10:55:01 -0400
From:   Waiman Long <>
To:     Kirill Tkhai <>, Tejun Heo <>,
        Li Zefan <>,
        Johannes Weiner <>,
        Jonathan Corbet <>,
        Michal Hocko <>,
        Vladimir Davydov <>
        Andrew Morton <>,
        Roman Gushchin <>,
        Shakeel Butt <>,
Subject: Re: [RFC PATCH 0/2] mm/memcontrol: Finer-grained memory control

On 04/11/2019 10:37 AM, Kirill Tkhai wrote:
> 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:

It will be helpful to know the use case where you want to limit page
cache usage. I have anonymous memory in mind when I compose this patch,
but I make the mechanism more generic so that it can apply to other use
cases as well.


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