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Date:   Sat, 09 Jan 2021 12:51:14 -0800 (PST)
From:   Palmer Dabbelt <palmer@...belt.com>
To:     atishp@...shpatra.org
CC:     linux-kernel@...r.kernel.org, rafael@...nel.org,
        catalin.marinas@....com, Jonathan.Cameron@...wei.com,
        Atish Patra <Atish.Patra@....com>,
        linux-riscv@...ts.infradead.org, will@...nel.org, ardb@...nel.org,
        linux-arch@...r.kernel.org, liuzhengyuan@...kylinos.cn,
        bhe@...hat.com, anup@...infault.org, daniel.lezcano@...aro.org,
        steven.price@....com, greentime.hu@...ive.com,
        aou@...s.berkeley.edu, Arnd Bergmann <arnd@...db.de>,
        anshuman.khandual@....com,
        Paul Walmsley <paul.walmsley@...ive.com>,
        linux-arm-kernel@...ts.infradead.org,
        Greg KH <gregkh@...uxfoundation.org>,
        akpm@...ux-foundation.org, rppt@...nel.org
Subject:     Re: [PATCH v5 0/5] Unify NUMA implementation between ARM64 & RISC-V

On Sun, 13 Dec 2020 17:02:19 PST (-0800), atishp@...shpatra.org wrote:
> On Wed, Nov 18, 2020 at 4:39 PM Atish Patra <atish.patra@....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.
>>
>> # 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
>>
>> The patches are also available at
>> https://github.com/atishp04/linux/tree/5.11_numa_unified_v5
>>
>> For RISC-V, the following qemu series is a pre-requisite(already available in upstream)
>> https://patchwork.kernel.org/project/qemu-devel/list/?series=303313
>>
>> Testing:
>> RISC-V:
>> Tested in Qemu and 2 socket OmniXtend FPGA.
>>
>> ARM64:
>> 2 socket kunpeng920 (4 nodes around 250G a node)
>> Tested-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
>>
>> Changes from v4->v5:
>> 1. Added by Acked-by & Reviewed-by tags.
>> 2. Swapped patch 1 & 2 in v4 version.
>>
>> Changes from v3->v4:
>> 1. Removed redundant duplicate header.
>> 2. Added Reviewed-by tags.
>>
>> 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):
>> arm64, numa: Change the numa init functions name to be generic
>> numa: Move numa implementation to common code
>> 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                 | 48 +----------------
>> arch/arm64/kernel/acpi_numa.c                 | 12 -----
>> 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     | 27 ++++++++--
>> include/asm-generic/numa.h                    | 52 +++++++++++++++++++
>> 17 files changed, 200 insertions(+), 72 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 (96%)
>> create mode 100644 include/asm-generic/numa.h
>>
>> --
>> 2.25.1
>>
>>
>> _______________________________________________
>> linux-riscv mailing list
>> linux-riscv@...ts.infradead.org
>> http://lists.infradead.org/mailman/listinfo/linux-riscv
>
> Hey Palmer,
> I did not see this series in for-next. Let me know if you need
> anything else to be done for this series.

Sorry about that.  It's on for-next, with Randy's comment addressed.  There was
one merge conflict: we don't have resource_init() in for-next yet (which I
think means I missed something else).  IDK if that's necessary for the NUMA
stuff, I just dropped it.  I haven't tested this yet.

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