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X-Rspam-User: X-Rspamd-Queue-Id: 5D68E2000F X-Rspamd-Server: rspam08 X-HE-Tag: 1768506612-13966 X-HE-Meta: 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 V40sWb9p 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 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: Andrew Morton wrote: > On Thu, 15 Jan 2026 17:43:02 +0800 Cui Chao wrote: > > > When a CXL RAM region is created in userspace, the memory capacity of > > the newly created region is not added to the CFMW-dedicated NUMA node. > > Instead, it is accumulated into an existing NUMA node (e.g., NUMA0 > > containing RAM). This makes it impossible to clearly distinguish between > > the two types of memory, which may affect memory-tiering applications. > > > > OK, thanks, I added this to the changelog. Please retain it when > sending v3. > > What I'm actually looking for here are answers to the questions > > Should we backport this into -stable kernels and if so, why? > And if not, why not? > > So a very complete description of the runtime effects really helps > myself and others to decide which kernels to patch. And it helps > people to understand *why* we made that decision. > > And sorry, but "may affect memory-tiering applications" isn't very > complete! > > So please, tell us how much our users are hurting from this and please > make a recommendation on the backporting decision. > To add on here, Cui, please describe which shipping hardware platforms in the wild create physical address maps like this. For example, if this is something that only occurs in QEMU configurations or similar, then the urgency is low and it is debatable if Linux should even worry about fixing it. I know that x86 platforms typically do not do this. It is also within the realm of possibility for platform firmware to fix. So in addition to platform impact please also clarify why folks can not just ask for a firmware update to get this fixed without updating their kernel.