Verstion three adding heterogeneous memory attributes to existing node sysfs subsystem.
== 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. == Changes since v2 == Fixed the arch specific build breakage from modifying the acpi table parsing. This one has been in a public tree for 0-day and no failures reported after several weeks. The HMAT parsing rules is split in its own patch. This was originally intended to be a starting point to enable auto-detect a use for enabling memory randomization: https://lkml.org/lkml/2018/12/17/1116 But will leave them split for separate consideration and bring randomization auto-enable back when these settle. The previous version's node interface allowed expressing the relationship only among the best locality nodes, called "primary" initiators and targets. Based on public and private feedback, the interface has been augmented to allow registering nodes under a "class" hierarchy. If a subsystem wishes to express node relationships beyond the best, they may create additional access classes. The HMAT subsystem this series only registers the best performing class, "class0". Various changelog and documentation updates and clarifications. Keith Busch (13): 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 Documentation/ABI: Add new node sysfs attributes acpi/hmat: Register processor domain to its memory node: Add heterogenous memory access attributes Documentation/ABI: Add node performance attributes acpi/hmat: Register performance attributes node: Add memory caching attributes Documentation/ABI: Add node cache 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 | 184 +++++++++++++ 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 | 9 + drivers/acpi/Makefile | 1 + drivers/acpi/hmat.c | 375 ++++++++++++++++++++++++++ drivers/acpi/numa.c | 16 +- drivers/acpi/scan.c | 4 +- drivers/acpi/tables.c | 76 +++++- drivers/base/Kconfig | 8 + drivers/base/node.c | 317 +++++++++++++++++++++- 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 | 70 ++++- 23 files changed, 1170 insertions(+), 65 deletions(-) create mode 100644 Documentation/admin-guide/mm/numaperf.rst create mode 100644 drivers/acpi/hmat.c -- 2.14.4