[RFT PATCH v3 0/5] Unify NUMA implementation between ARM64 & RISC-V

[Jonathan Cameron]

On Fri, 18 Sep 2020 13:11:35 -0700
Atish Patra <atish.patra at wdc.com> wrote:

> This series attempts to move the ARM64 numa implementation to common
> code so that RISC-V can leverage that as well instead of reimplementing
> it again.
> 
> RISC-V specific bits are based on initial work done by Greentime Hu [1] but
> modified to reuse the common implementation to avoid duplication.
> 
> [1] https://lkml.org/lkml/2020/1/10/233
> 
> This series has been tested on qemu with numa enabled for both RISC-V & ARM64.
> It would be great if somebody can test it on numa capable ARM64 hardware platforms.
> This patch series doesn't modify the maintainers list for the common code (arch_numa)
> as I am not sure if somebody from ARM64 community or Greg should take up the
> maintainership. Ganapatrao was the original author of the arm64 version.
> I would be happy to update that in the next revision once it is decided.

Was fairly sure this set was a noop on arm64 ACPI systems, but ran a quick
sanity check on a 2 socket kunpeng920 and everything came up as normal
(4 nodes, around 250G a node) 

Tested-by: Jonathan Cameron <Jonathan.Cameron at huawei.com>
For patches 1 and 2.  Doesn't seem relevant to the rest :)

> 
> # numactl --hardware
> available: 2 nodes (0-1)
> node 0 cpus: 0 1 2 3
> node 0 size: 486 MB
> node 0 free: 470 MB
> node 1 cpus: 4 5 6 7
> node 1 size: 424 MB
> node 1 free: 408 MB
> node distances:
> node   0   1 
>   0:  10  20 
>   1:  20  10 
> # numactl -show
> policy: default
> preferred node: current
> physcpubind: 0 1 2 3 4 5 6 7 
> cpubind: 0 1 
> nodebind: 0 1 
> membind: 0 1 
> 
> For RISC-V, the following qemu series is a pre-requisite(already available in upstream)
> to test the patches in Qemu and 2 socket OmniXtend FPGA.
> 
> https://patchwork.kernel.org/project/qemu-devel/list/?series=303313
> 
> The patches are also available at
> 
> https://github.com/atishp04/linux/tree/5.10_numa_unified_v3
> 
> There may be some minor conflicts with Mike's cleanup series [2] depending on the
> order in which these two series are being accepted. I can rebase on top his series
> if required.
> 
> [2] https://lkml.org/lkml/2020/8/18/754
> 
> Changes from v2->v3:
> 1. Added Acked-by/Reviewed-by tags.
> 2. Replaced asm/acpi.h with linux/acpi.h
> 3. Defined arch_acpi_numa_init as static.
> 
> Changes from v1->v2:
> 1. Replaced ARM64 specific compile time protection with ACPI specific ones.
> 2. Dropped common pcibus_to_node changes. Added required changes in RISC-V. 
> 3. Fixed few typos.
> 
> Atish Patra (4):
> numa: Move numa implementation to common code
> arm64, numa: Change the numa init functions name to be generic
> riscv: Separate memory init from paging init
> riscv: Add numa support for riscv64 platform
> 
> Greentime Hu (1):
> riscv: Add support pte_protnone and pmd_protnone if
> CONFIG_NUMA_BALANCING
> 
> arch/arm64/Kconfig                            |  1 +
> arch/arm64/include/asm/numa.h                 | 45 +----------------
> arch/arm64/kernel/acpi_numa.c                 | 13 -----
> arch/arm64/mm/Makefile                        |  1 -
> arch/arm64/mm/init.c                          |  4 +-
> arch/riscv/Kconfig                            | 31 +++++++++++-
> arch/riscv/include/asm/mmzone.h               | 13 +++++
> arch/riscv/include/asm/numa.h                 |  8 +++
> arch/riscv/include/asm/pci.h                  | 14 ++++++
> arch/riscv/include/asm/pgtable.h              | 21 ++++++++
> arch/riscv/kernel/setup.c                     | 11 ++++-
> arch/riscv/kernel/smpboot.c                   | 12 ++++-
> arch/riscv/mm/init.c                          | 10 +++-
> drivers/base/Kconfig                          |  6 +++
> drivers/base/Makefile                         |  1 +
> .../mm/numa.c => drivers/base/arch_numa.c     | 31 ++++++++++--
> include/asm-generic/numa.h                    | 49 +++++++++++++++++++
> 17 files changed, 201 insertions(+), 70 deletions(-)
> create mode 100644 arch/riscv/include/asm/mmzone.h
> create mode 100644 arch/riscv/include/asm/numa.h
> rename arch/arm64/mm/numa.c => drivers/base/arch_numa.c (95%)
> create mode 100644 include/asm-generic/numa.h
> 
> --
> 2.25.1
>