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[209.132.183.28]) by mx.google.com with ESMTPS id z24si728117qta.69.2019.04.11.07.55.17 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 11 Apr 2019 07:55:17 -0700 (PDT) Received-SPF: pass (google.com: domain of longman@redhat.com designates 209.132.183.28 as permitted sender) client-ip=209.132.183.28; Authentication-Results: mx.google.com; spf=pass (google.com: domain of longman@redhat.com designates 209.132.183.28 as permitted sender) smtp.mailfrom=longman@redhat.com; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=redhat.com Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id B69158E581; Thu, 11 Apr 2019 14:55:06 +0000 (UTC) Received: from llong.remote.csb (dhcp-17-47.bos.redhat.com [10.18.17.47]) by smtp.corp.redhat.com (Postfix) with ESMTP id 7F02D17F22; Thu, 11 Apr 2019 14:55:02 +0000 (UTC) Subject: Re: [RFC PATCH 0/2] mm/memcontrol: Finer-grained memory control To: Kirill Tkhai , Tejun Heo , Li Zefan , Johannes Weiner , Jonathan Corbet , Michal Hocko , Vladimir Davydov Cc: linux-kernel@vger.kernel.org, cgroups@vger.kernel.org, linux-doc@vger.kernel.org, linux-mm@kvack.org, Andrew Morton , Roman Gushchin , Shakeel Butt , aryabinin@virtuozzo.com References: <20190410191321.9527-1-longman@redhat.com> <1b6ee304-6176-15a0-c3fa-0b59cdd60085@virtuozzo.com> From: Waiman Long Openpgp: preference=signencrypt Autocrypt: addr=longman@redhat.com; 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Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 In-Reply-To: <1b6ee304-6176-15a0-c3fa-0b59cdd60085@virtuozzo.com> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Content-Language: en-US X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.28]); Thu, 11 Apr 2019 14:55:16 +0000 (UTC) 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 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