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[2003:cb:c705:f700:352b:d857:b95d:9072]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-37ee0b9bb15sm6766254f8f.99.2024.10.22.07.35.31 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 22 Oct 2024 07:35:31 -0700 (PDT) Message-ID: <4a14d90b-75f0-4f4f-9e04-e2f7a39d85ba@redhat.com> Date: Tue, 22 Oct 2024 16:35:30 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [RFC] Virtualizing tagged disaggregated memory capacity (app specific, multi host shared) To: Gregory Price Cc: Jonathan Cameron , linux-mm@kvack.org, linux-cxl@vger.kernel.org, Davidlohr Bueso , Ira Weiny , John Groves , virtualization@lists.linux.dev, Oscar Salvador , qemu-devel@nongnu.org, Dave Jiang , Dan Williams , linuxarm@huawei.com, wangkefeng.wang@huawei.com, John Groves , Fan Ni , Navneet Singh , =?UTF-8?B?4oCcTWljaGFlbCBTLiBUc2lya2lu4oCd?= , Igor Mammedov , =?UTF-8?Q?Philippe_Mathieu-Daud=C3=A9?= References: <20240815172223.00001ca7@Huawei.com> <1238f2a3-88a2-4996-92f2-05735801002b@redhat.com> From: David Hildenbrand Autocrypt: addr=david@redhat.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Stat-Signature: yriyw9o8fo7g6bchby4ybc7a49isc9gw X-Rspamd-Queue-Id: A47AB20024 X-Rspam-User: X-Rspamd-Server: rspam08 X-HE-Tag: 1729607719-476925 X-HE-Meta: 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 KHpNegb/ OmofaJRFcCQMNQOrew7IvUfiRgFuy2RBa6qzTkk+ZQtFQSAvznKYyJfvHC8pZJwFUif9FFX97nI8eLpQbLxVo+i+8mZbVzPZiMI/Q059Pbl1iJ6J1SHUC1qilACl38wCbjelGUz5A5Qe2JOcU1fHKlanZNPoU2I04zT0sztpfU+SIXY4SPC+w34gbb5JxWC9QygyryEz1hIOEt/N4zDes4ESIdTC0dFU/DcslKPUcg3rIRzDaUcLw91mogxHMYNcxLLTp14UtXZkrYW0CE3HXTG9HJw55cJLa9FHA5h+G6+DUsuy1fThSmEbE8AVod1HmcOsOcp22oIqT6xRPTTJzuNbxgZuuW+kj+jYgj+6clxGtvc50idhGmvM2BxuVEUiEvbb7caouK0h2WqA= 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: List-Subscribe: List-Unsubscribe: On 22.10.24 16:24, Gregory Price wrote: > On Tue, Oct 22, 2024 at 11:33:07AM +0200, David Hildenbrand wrote: >> On 20.09.24 11:06, Gregory Price wrote: >> >>> The only concern is when insufficient ZONE_NORMAL exists to support >>> ZONE_MOVABLE capacity - but this is unlikely to be the general scenario AND >>> can be mitigated w/ existing mechanisms. >> >> It might be worthwhile looking at >> Documentation/admin-guide/mm/memory-hotplug.rst "auto-movable" memory >> onlining polciy. It might not fit all sue cases, though (just like >> ZONE_MOVABLE doesn't) >> > > I managed to miss auto-movable in my last pass through there. Though for > our use-case, forcibly preventing ZONE_NORMAL for all CXL is the preferred > option in an effort to keep as much kernel resources out of high latency > memory. Yes, that makes sense for this memory with very different performance characteristics. -- Cheers, David / dhildenb