Since NVDIMMs are installed on memory slots, they expose the NUMA topology of a platform. This patchset adds support of sysfs 'numa_node' to the NVDIMM devices under /sys/bus/nd/devices. With this change, numactl(8) accepts 'block:' and 'file:' paths of pmem and btt devices as shown in the examples below. numactl --preferred block:pmem0 --show numactl --preferred file:/dev/pmem0s --show Here is a result of fio benchmark to ext4/dax on pmem0 using numactl on an HP DL380 with 2 sockets; pmem0 on node 0, and pmem1 on node 1. Local [1] : 4098.3MB/s Remote [2]: 3718.4MB/s [1] numactl --preferred block:pmem0 --cpunodebind block:pmem0 fio <fs-on-pmem0> [2] numactl --preferred block:pmem1 --cpunodebind block:pmem1 fio <fs-on-pmem0> Patch 1/3-2/3 apply on top of the acpica branch of the pm tree. Patch 3/3 applies on top of Dan Williams's v5 patch series of "libnvdimm: non-volatile memory devices". --- Toshi Kani (3): 1/3 acpi: Fix acpi_map_pxm_to_node() to handle numa_off 2/3 acpi: Add export to acpi_map_pxm_to_node() 3/3 libnvdimm: Add sysfs numa_node to NVDIMM devices --- drivers/acpi/nfit.c | 2 ++ drivers/acpi/numa.c | 13 ++++++++++--- drivers/nvdimm/btt.c | 2 ++ drivers/nvdimm/bus.c | 12 ++++++++++++ drivers/nvdimm/nd.h | 1 + drivers/nvdimm/region.c | 1 + drivers/nvdimm/region_devs.c | 1 + include/linux/acpi.h | 5 +++++ include/linux/libnvdimm.h | 1 + 9 files changed, 35 insertions(+), 3 deletions(-) -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
