linux-kernel - Re: [RFC/RFT PATCH v2 0/5] Unify NUMA implementation between ARM64 & RISC-V

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Date:   Mon, 14 Sep 2020 09:04:48 +0100
From:   Jonathan Cameron <Jonathan.Cameron@...wei.com>
To:     Atish Patra <atish.patra@....com>
CC:     <linux-kernel@...r.kernel.org>, Albert Ou <aou@...s.berkeley.edu>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Anshuman Khandual <anshuman.khandual@....com>,
        Anup Patel <anup@...infault.org>,
        "Arnd Bergmann" <arnd@...db.de>,
        Catalin Marinas <catalin.marinas@....com>,
        "David Hildenbrand" <david@...hat.com>,
        Greentime Hu <greentime.hu@...ive.com>,
        Bjorn Helgaas <helgaas@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jia He <justin.he@....com>, <linux-arch@...r.kernel.org>,
        <linux-riscv@...ts.infradead.org>,
        "Mike Rapoport" <rppt@...nel.org>,
        Nicolas Saenz Julienne <nsaenzjulienne@...e.de>,
        Palmer Dabbelt <palmer@...belt.com>,
        "Paul Walmsley" <paul.walmsley@...ive.com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Steven Price <steven.price@....com>,
        Will Deacon <will@...nel.org>, Zong Li <zong.li@...ive.com>
Subject: Re: [RFC/RFT PATCH v2 0/5] Unify NUMA implementation between ARM64
 & RISC-V

On Fri, 11 Sep 2020 18:34:36 -0700
Atish Patra <atish.patra@....com> wrote:


Hi Atish,

I'm not seeing a change log from v1.  Putting one in makes it easier
for people who reviewed v1 to remember what to look for when looking
at v2.

Either here, or individual patches after the --- is fine.

Thanks,

Jonathan


> 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.
> 
> # 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_v2
> 
> 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
> 
> Atish Patra (4):
> numa: Move numa implementation to common code
> arm64, numa: Change the numa init function 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     | 29 +++++++++--
> include/asm-generic/numa.h                    | 49 +++++++++++++++++++
> 17 files changed, 200 insertions(+), 69 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
> 
> --
> 2.24.0
>