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

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Date:   Mon, 11 Mar 2019 11:47:37 +0000
From:   Jonathan Cameron <jonathan.cameron@...wei.com>
To:     Keith Busch <keith.busch@...el.com>
CC:     <linux-kernel@...r.kernel.org>, <linux-acpi@...r.kernel.org>,
        <linux-mm@...ck.org>, <linux-api@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Rafael Wysocki <rafael@...nel.org>,
        "Dave Hansen" <dave.hansen@...el.com>,
        Dan Williams <dan.j.williams@...el.com>, <linuxarm@...wei.com>
Subject: Re: [PATCHv7 00/10] Heterogenous memory node attributes

On Wed, 27 Feb 2019 15:50:28 -0700
Keith Busch <keith.busch@...el.com> wrote:

> == 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.

Hi Keith,

Great to see this 'nearly' good to go.

For those that were too small / trivial to deserve a reviewed-by
Acked-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>

Subject to that one tweak in patch 7,
Tested-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>

Note that my tests were very limited for the memory-side caches
and not exactly comprehensive for the access attributes either.

They focused on the cases I care about rather than putting together
a fuller test suite.  That is probably worth doing at some point though
not sure I'll get to it any time soon.

Thanks,

Jonathan

> 
> 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
>