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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000024, 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 12/18/2024 8:51 PM, Nadav Amit wrote: > > >> On 18 Dec 2024, at 6:19, David Rientjes wrote: >> >> Hi everybody, >> >> We had a very interactive discussion last week led by RaghavendraKT on >> slow-tier page promotion intended for memory tiering platforms, thank >> you! Thanks as well to everybody who attended and provided great >> questions, suggestions, and feedback. >> >> The RFC patch series "mm: slowtier page promotion based on PTE A bit"[1] >> is a proposal to allow for asynchronous page promotion based on memory >> accesses as an alternative to NUMA Balancing based promotions. There was >> widespread interest in this topic and the discussion surfaced multiple >> use cases and requirements, very focused on CXL use cases. >> > > Just sharing my 2 cents. > > IIUC, the suggested approach has two benefits: > > 1. Fewer/no page-faults (as A-bit is used to detect usage) > 2. Batching > > While (2) seems like a win that might be added un top of AutoNUMA, (1) > is more delicate. As indicated in the patch-set, the "exact destination” > is lost. At the same time, the last time I checked, the A-bit setting > wasn’t free and cost something like 550 cycles (others saw similar > results [1]). > > So considering empty page-fault is ~1050 cycles (2014 number Linus > measured [2]), there is a question how big of a win it is... > > > [1] https://lore.kernel.org/all/20160620000606.GB3194@blaptop/ > [2] Google+ post RIP Thanks for the feedback. (as I noted in other post), can A bit scanning that detects hot VMA information be fed to NUMAB=1 scanning? Regards - Raghu