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Thu, 23 Oct 2025 16:29:48 +0100 Date: Thu, 23 Oct 2025 16:29:44 +0100 From: Jonathan Cameron To: Gregory Price CC: , Yiannis Nikolakopoulos , Wei Xu , David Rientjes , Matthew Wilcox , Bharata B Rao , , , , , , , , , , , , , , , , , , , , , , , , "Adam Manzanares" Subject: Re: [RFC PATCH v2 0/8] mm: Hot page tracking and promotion infrastructure Message-ID: <20251023162944.000074dd@huawei.com> In-Reply-To: References: <20251017153613.00004940@huawei.com> <20251020150526.000078b6@huawei.com> <20251022100950.00002785@huawei.com> X-Mailer: Claws Mail 4.3.0 (GTK 3.24.42; x86_64-w64-mingw32) MIME-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit X-Originating-IP: [10.203.177.15] X-ClientProxiedBy: lhrpeml100010.china.huawei.com (7.191.174.197) To dubpeml100005.china.huawei.com (7.214.146.113) X-Rspam-User: X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 2537B80007 X-Stat-Signature: z6utsooddwphjb943ht7ora1rsse3ime X-HE-Tag: 1761233394-777936 X-HE-Meta: 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 1F5l68VA 8c+m15WPLyGnDxMSPcRRULnEjTVNPY4UlFcxdz5lbwiRpXmpIPkUpLcOXJ/omRSZKwNKoRyZANrrq2ngiYwpt4DgH+b82/PK42NPdFRhyMszzHa7kkwQ3XEZMsiJRdOmes/mUGEuG2NMdq0HW6FlMoseu+LM4GTW+7qe5Z1dtCpQnddGlVoO8N0jGjk72NlV76czcVoNatfsqyTY5VDkat/mcsXdlZN0z6/7uOg7kVHhjWysEwltTdqegMr52uUkvfNgMT+bbgU1UGRhYUyOjiqRr1CMcO9tksKt+olKn42eJTU6kvUnmYWz3qSuH5mvtzEULpMKbPbKFfpSs0jvz5aF5wSLdEpGOT7n3 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 Wed, 22 Oct 2025 11:05:16 -0400 Gregory Price wrote: > On Wed, Oct 22, 2025 at 10:09:50AM +0100, Jonathan Cameron wrote: > > > > My gut feeling is the need to do dynamic NUMA nodes will not be driven > > but this but more by large scale fabrics (if that ever happens) > > and trade offs of host PA space vs QoS in the hardware. Those > > trade offs might put memory with very different performance > > characteristics behind one window. > > > > I can't believe we live in a world where "We have to think about the > scenario where we actually need all 256 TB of 48-bit phys-addressing" > is not a tongue in cheek joke o_o You think everyone wires all the 48 bits? Certainly not everyone does. > > That's a paltry 2048 128GB DIMMs... and whatever monstrosity you have to > build to host it all but that's at least a fun engineering problem :V > > Bring on the 128-bit CPUs! > > What do we name those x86 registers though? Slap the E back on for ERAX? > > > Meh. Let's suggest people burn host PA space for now. If anyone hits > > that limit they can solve it (crosses fingers it's not my lot :) > > > > +1 > > ~Gregory