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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 Content-Language: en-US Autocrypt: addr=david@redhat.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Received-SPF: pass client-ip=170.10.129.124; envelope-from=david@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -42 X-Spam_score: -4.3 X-Spam_bar: ---- X-Spam_report: (-4.3 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.519, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-1.697, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org 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