Le 22/10/2018 à 22:13, Dave Hansen a écrit : > Persistent memory is cool. But, currently, you have to rewrite > your applications to use it. Wouldn't it be cool if you could > just have it show up in your system like normal RAM and get to > it like a slow blob of memory? Well... have I got the patch > series for you! > > This series adds a new "driver" to which pmem devices can be > attached. Once attached, the memory "owned" by the device is > hot-added to the kernel and managed like any other memory. On > systems with an HMAT (a new ACPI table), each socket (roughly) > will have a separate NUMA node for its persistent memory so > this newly-added memory can be selected by its unique NUMA > node. Hello Dave What happens on systems without an HMAT? Does this new memory get merged into existing NUMA nodes? Also, do you plan to have a way for applications to find out which NUMA nodes are "real DRAM" while others are "pmem-backed"? (something like a new attribute in /sys/devices/system/node/nodeX/) Or should we use HMAT performance attributes for this? Brice
