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SubjectRe: [RFC PATCH 0/2] mm/memcontrol: Finer-grained memory control
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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:
>
> https://github.com/OpenVZ/vzkernel/commit/8ceef5e0c07c7621fcb0e04ccc48a679dfeec4a4

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.

Cheers,
Longman

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