"Li, Zhijian" <lizhijian@xxxxxxxxxxxxxx> writes: > Copied to nvdimm list > > Thanks > > Zhijian > > > on 2022/1/6 14:12, Li Zhijian wrote: >> >> Add Dan to the party :) >> >> May i know whether there is any existing APIs to check whether >> a va/page backs to a nvdimm/pmem ? I don't know of one. You could try walk_system_ram_range looking for IORES_DESC_PERSISTENT_MEMORY, but that's not very efficient. >>> You need to get Dan to check this out, but I'm pretty sure this should >>> be more like this: >>> >>> if (is_zone_device_page(page) && page->pgmap->type == >>> MEMORY_DEVICE_FS_DAX) You forgot MEMORY_DEVICE_GENERIC. However, this doesn't guarantee the memory belongs to persistent memory, only that it is direct access capable. Dan, any ideas? -Jeff
