linux-kernel - [PATCHv7 00/10] Heterogenous memory node attributes

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Date:   Wed, 27 Feb 2019 15:50:28 -0700
From:   Keith Busch <keith.busch@...el.com>
To:     linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
        linux-mm@...ck.org, linux-api@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Rafael Wysocki <rafael@...nel.org>,
        Dave Hansen <dave.hansen@...el.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Keith Busch <keith.busch@...el.com>
Subject: [PATCHv7 00/10] Heterogenous memory node attributes

== Changes since v6 ==

  Updated to linux-next, which has a change to the HMAT structures to
  account for ACPI revision 6.3.

  Changed memory-side cache "associativity" attribute to "indexing"

Regarding the Kconfig, I am having the implementation specific as a user
selectable option, and the generic interface, HMEM_REPORTING, is not a
user prompt. I just wanted to clarify the point that there's only one.

== 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. Those applications may query performance
attributes relative to a particular CPU they're running on in order to
make more informed choices for where they want to allocate hot and cold
data. This works with mbind() or the numactl library.

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
  node: Add heterogenous memory access attributes
  node: Add memory-side caching attributes
  acpi/hmat: Register processor domain to its memory
  acpi/hmat: Register performance 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     | 164 +++++++
 arch/arm64/kernel/acpi_numa.c                 |   2 +-
 arch/arm64/kernel/smp.c                       |   4 +-
 arch/ia64/kernel/acpi.c                       |  14 +-
 arch/x86/kernel/acpi/boot.c                   |  36 +-
 drivers/acpi/Kconfig                          |   1 +
 drivers/acpi/Makefile                         |   1 +
 drivers/acpi/hmat/Kconfig                     |  11 +
 drivers/acpi/hmat/Makefile                    |   1 +
 drivers/acpi/hmat/hmat.c                      | 670 ++++++++++++++++++++++++++
 drivers/acpi/numa.c                           |  16 +-
 drivers/acpi/scan.c                           |   4 +-
 drivers/acpi/tables.c                         |  76 ++-
 drivers/base/Kconfig                          |   8 +
 drivers/base/node.c                           | 352 +++++++++++++-
 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                          |  72 ++-
 25 files changed, 1487 insertions(+), 66 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