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

[Jonathan Cameron <Jonathan.Cameron@Huawei.com>]

On Mon, 21 Sep 2020 17:08:32 -0700
Atish Patra <atishp@atishpatra.org> wrote:

> On Mon, Sep 21, 2020 at 8:51 AM Jonathan Cameron
> <Jonathan.Cameron@huawei.com> wrote:
> >
> > On Fri, 18 Sep 2020 13:11:35 -0700
> > Atish Patra <atish.patra@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.  
> >  
> 
> Any thoughts on the maintenanership of this code ?

Currently it is a trivial enough bit of code, I'd not be too worried
as long as it doesn't fall through the cracks.  Changes that directory are going
to need a GregKH Ack so unlikely anything will get missed.

If you feel a specific entry is needed in MAINTAINERS go for it.
Feel free to stick me down as a reviewer and I'll keep an eye on
it from ARM64 side of things.

Thanks,

Jonathan


> 
> > 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@huawei.com>
> > For patches 1 and 2.  Doesn't seem relevant to the rest :)
> >  
> 
> Thanks a lot!
> 
> > >
> > > # 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
> > >  
> >
> >
> >
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> 
> 
>