Changes since v1 [1]: - Rework numa_map_to_online_node() to be compatible with papr_scm_node() (Aneesh) - Export the 'target_node' attribute for nvdimm regions and namespaces (Aneesh) - Rename memory_add_physaddr_to_target_nid() to phys_to_target_node() and make it independent of CONFIG_MEMORY_HOTPLUG=y. Put a weak definition in mm/mempolicy.c that can be overridden by an arch implementation. - Fix various build reports (kbuild-robot) - Collect some reviewed-by's from Aneesh. [1]: https://lore.kernel.org/r/157309899529.1582359.15358067933360719580.stgit@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx/ --- As mentioned in the v1 cover letter [1] the libnvdimm device-type cleanup is intertwined with the new target_node infrastructure. The more interesting patches for arch and mm folks start at patch 14. This new infrastructure will prove more valuable over time for Memory Tiers / Hierarchy management as more platforms (via the ACPI HMAT and EFI Specific Purpose Memory) publish reserved or "soft-reserved" ranges to Linux. Linux system administrators will expect to be able to interact with those ranges with a unique numa node number when/if that memory is onlined via the dax_kmem driver [2]. One configuration that currently fails to properly convey the target node for the resulting memory hotplug operation is persistent memory defined by the memmap=nn!ss parameter. For example, today if node1 is a memory only node, and all the memory from node1 is specified to memmap=nn!ss and subsequently onlined, it will end up being onlined as node0 memory. As it stands, memory_add_physaddr_to_nid() can only identify online nodes and since node1 in this example has no online cpus / memory the target node is initialized node0. The fix is to preserve rather than discard the numa_meminfo entries that are relevant for reserved memory ranges, and to uplevel the node distance helper for determining the "local" (closest) node relative to an initiator node. The first 13 patches are cleanups to make sure that all nvdimm devices and their children properly export a numa_node attribute, and add a 'target_node' attribute by default to regions and namespaces. The switch to a device-type is less code and less error prone as a result. Patch 14 - 17 are the core changes to allow numa node information for offline memory to be tracked, and to provide a unified node mapping distance helper across architectures numa_map_to_online_node. Patches 18 uses this new capability to fix the conveyance of target_node information for memmap=nn!ss assignments. See patch 18 for more details and the test case. Given the timeframe to the v5.5 merge window I expect patch 14 - 18 will likely miss due to not enough time to review, but posting them for feedback nonetheless. [2]: https://pmem.io/ndctl/daxctl-reconfigure-device.html --- Dan Williams (18): libnvdimm: Move attribute groups to device type libnvdimm: Move region attribute group definition libnvdimm: Move nd_device_attribute_group to device_type libnvdimm: Move nd_numa_attribute_group to device_type libnvdimm: Move nd_region_attribute_group to device_type libnvdimm: Move nd_mapping_attribute_group to device_type libnvdimm: Move nvdimm_attribute_group to device_type libnvdimm: Move nvdimm_bus_attribute_group to device_type dax: Create a dax device_type dax: Simplify root read-only definition for the 'resource' attribute libnvdimm: Simplify root read-only definition for the 'resource' attribute dax: Add numa_node to the default device-dax attributes libnvdimm: Export the target_node attribute for regions and namespaces acpi/numa: Up-level "map to online node" functionality mm/numa: Skip NUMA_NO_NODE and online nodes in numa_map_to_online_node() powerpc/papr_scm: Switch to numa_map_to_online_node() x86/numa: Provide a range-to-target_node lookup facility libnvdimm/e820: Retrieve and populate correct 'target_node' info arch/powerpc/platforms/pseries/papr_scm.c | 46 ------ arch/x86/mm/numa.c | 76 +++++++++ drivers/acpi/nfit/core.c | 7 - drivers/acpi/numa.c | 41 ----- drivers/dax/bus.c | 22 ++- drivers/nvdimm/btt_devs.c | 24 +-- drivers/nvdimm/bus.c | 44 +++++ drivers/nvdimm/core.c | 8 + drivers/nvdimm/dax_devs.c | 27 +-- drivers/nvdimm/dimm_devs.c | 30 ++-- drivers/nvdimm/e820.c | 31 ---- drivers/nvdimm/namespace_devs.c | 77 +++++----- drivers/nvdimm/nd.h | 5 - drivers/nvdimm/of_pmem.c | 13 -- drivers/nvdimm/pfn_devs.c | 38 ++--- drivers/nvdimm/region_devs.c | 235 +++++++++++++++-------------- include/linux/acpi.h | 23 +++ include/linux/libnvdimm.h | 7 - include/linux/numa.h | 17 ++ mm/mempolicy.c | 35 ++++ 20 files changed, 430 insertions(+), 376 deletions(-)
