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 S0Ys70W8 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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, > ...to be clear, dax_kmem is not creating a new NUMA node, it is just > potentially onlining a proximity domain that was fully described by ACPI > SRAT but offline. > >> 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? > Userland should be able to interrogate the memory_side_cache/ property > in NUMA sysfs: > > https://docs.kernel.org/admin-guide/mm/numaperf.html?#numa-cache > > Otherwise I believe SRAT and SLIT for that node only reflect the > performance of the DDR fronting the PMEM. So if you have a DDR node and > DDR+PMEM cache node, they may look the same from the ACPI SLIT > perspective, but the ACPI HMAT contains the details of the backing > memory. The Linux NUMA performance sysfs interface gets populated by > ACPI HMAT. Thanks Dan. Please correct me if I'm mistaken:  if I configure some barlowpass nvdimms to MemoryMode and reboot, as those regions of memory is automatically two level with DDR as the front cache, so hmat_init() is expected to create the memory_side_cache/indexN interface, and if I see multiple indexN layers, that would be a sign that pmem in MemoryMode is present, right? I've yet to grab hold of a system to confirm this, but apparently with only DDR memory, memory_side_cache/ doesn't exist. thanks! -jane