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On 3/7/2024 1:05 PM, Dan Williams wrote: > Jane Chu wrote: >> Hi, Dan and Vishal, >> >> What kind of NUMAness is visible to the kernel w.r.t. SysRAM region >> backed by Barlopass nvdimms configured in MemoryMode by impctl ? > As always, the NUMA description, is a property of the platform not the > media type / DIMM. The ACPI HMAT desrcibes the details of a > memory-side-caches. See "5.2.27.2 Memory Side Cache Overview" in ACPI > 6.4. Thanks!  So, compare to dax_kmem which assign a numa node to a newly converted pmem/SysRAM region,  w.r.t. pmem in MemoryMode, is there any clue that kernel exposes(or could expose) to userland about the extra latency such that userland may treat these memory regions differently? thanks, -jane