== Changes since v4 == All public interfaces have kernel docs. Renamed "class" to "access", docs and changed logs updated accordingly. (Rafael) The sysfs hierarchy is altered to put initiators and targets in their own attribute group directories (Rafael). The node lists are removed. This feedback is in conflict with v1 feedback, but consensus wants to remove multi-value sysfs attributes, which includes lists. We only have symlinks now, just like v1 provided. Documentation and code patches are combined such that the code introducing new attributes and its documentation are in the same patch. (Rafael and Dan). The performance attributes, bandwidth and latency, are moved into the initiators directory. This should make it obvious for which node access the attributes apply, which was previously ambiguous. (Jonathan Cameron). The HMAT code selecting "local" initiators is substantially changed. Only PXM's that have identical performance to the HMAT's processor PXM in Address Range Structure are registered. This is to avoid considering nodes identical when only one of several perf attributes are the same. (Jonathan Cameron). Verbose variable naming. Examples include "initiator" and "target" instead of "i" and "t", "mem_pxm" and "cpu_pxm" instead of "m" and "p". (Rafael) Compile fixes for when HMEM_REPORTING is not set. This is not a user selectable config option, default 'n', and will have to be selected by other config options that require it (Greg KH and Rafael). == Background == Platforms may provide multiple types of cpu attached system memory. The memory ranges for each type may have different characteristics that applications may wish to know about when considering what node they want their memory allocated from. It had previously been difficult to describe these setups as memory rangers were generally lumped into the NUMA node of the CPUs. New platform attributes have been created and in use today that describe the more complex memory hierarchies that can be created. This series' objective is to provide the attributes from such systems that are useful for applications to know about, and readily usable with existing tools and libraries. Keith Busch (10): acpi: Create subtable parsing infrastructure acpi: Add HMAT to generic parsing tables acpi/hmat: Parse and report heterogeneous memory node: Link memory nodes to their compute nodes acpi/hmat: Register processor domain to its memory node: Add heterogenous memory access attributes acpi/hmat: Register performance attributes node: Add memory caching attributes acpi/hmat: Register memory side cache attributes doc/mm: New documentation for memory performance Documentation/ABI/stable/sysfs-devices-node | 87 ++++- Documentation/admin-guide/mm/numaperf.rst | 167 ++++++++ arch/arm64/kernel/acpi_numa.c | 2 +- arch/arm64/kernel/smp.c | 4 +- arch/ia64/kernel/acpi.c | 12 +- arch/x86/kernel/acpi/boot.c | 36 +- drivers/acpi/Kconfig | 1 + drivers/acpi/Makefile | 1 + drivers/acpi/hmat/Kconfig | 9 + drivers/acpi/hmat/Makefile | 1 + drivers/acpi/hmat/hmat.c | 537 ++++++++++++++++++++++++++ drivers/acpi/numa.c | 16 +- drivers/acpi/scan.c | 4 +- drivers/acpi/tables.c | 76 +++- drivers/base/Kconfig | 8 + drivers/base/node.c | 354 ++++++++++++++++- drivers/irqchip/irq-gic-v2m.c | 2 +- drivers/irqchip/irq-gic-v3-its-pci-msi.c | 2 +- drivers/irqchip/irq-gic-v3-its-platform-msi.c | 2 +- drivers/irqchip/irq-gic-v3-its.c | 6 +- drivers/irqchip/irq-gic-v3.c | 10 +- drivers/irqchip/irq-gic.c | 4 +- drivers/mailbox/pcc.c | 2 +- include/linux/acpi.h | 6 +- include/linux/node.h | 60 ++- 25 files changed, 1344 insertions(+), 65 deletions(-) create mode 100644 Documentation/admin-guide/mm/numaperf.rst create mode 100644 drivers/acpi/hmat/Kconfig create mode 100644 drivers/acpi/hmat/Makefile create mode 100644 drivers/acpi/hmat/hmat.c -- 2.14.4
