Re: [PATCH v4 0/3] NUMA: Apply cluster-NUMA-node boundary for aarch64 and riscv machines

[Igor Mammedov <imammedo@redhat.com>]

On Thu, 13 Apr 2023 13:50:57 +0800
Gavin Shan <gshan@redhat.com> wrote:

> On 4/12/23 7:42 PM, Peter Maydell wrote:
> > On Wed, 12 Apr 2023 at 02:08, Gavin Shan <gshan@redhat.com> wrote:  
> >> On 3/27/23 9:26 PM, Igor Mammedov wrote:  
> >>> On Fri, 17 Mar 2023 14:25:39 +0800
> >>> Gavin Shan <gshan@redhat.com> wrote:
> >>>  
> >>>> For arm64 and riscv architecture, the driver (/base/arch_topology.c) is
> >>>> used to populate the CPU topology in the Linux guest. It's required that
> >>>> the CPUs in one cluster can't span mutiple NUMA nodes. Otherwise, the Linux
> >>>> scheduling domain can't be sorted out, as the following warning message
> >>>> indicates. To avoid the unexpected confusion, this series attempts to
> >>>> warn about such kind of irregular configurations.
> >>>>
> >>>>      -smp 6,maxcpus=6,sockets=2,clusters=1,cores=3,threads=1 \
> >>>>      -numa node,nodeid=0,cpus=0-1,memdev=ram0                \
> >>>>      -numa node,nodeid=1,cpus=2-3,memdev=ram1                \
> >>>>      -numa node,nodeid=2,cpus=4-5,memdev=ram2                \
> >>>>
> >>>>      ------------[ cut here ]------------
> >>>>      WARNING: CPU: 0 PID: 1 at kernel/sched/topology.c:2271 build_sched_domains+0x284/0x910
> >>>>      Modules linked in:
> >>>>      CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.14.0-268.el9.aarch64 #1
> >>>>      pstate: 00400005 (nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
> >>>>      pc : build_sched_domains+0x284/0x910
> >>>>      lr : build_sched_domains+0x184/0x910
> >>>>      sp : ffff80000804bd50
> >>>>      x29: ffff80000804bd50 x28: 0000000000000002 x27: 0000000000000000
> >>>>      x26: ffff800009cf9a80 x25: 0000000000000000 x24: ffff800009cbf840
> >>>>      x23: ffff000080325000 x22: ffff0000005df800 x21: ffff80000a4ce508
> >>>>      x20: 0000000000000000 x19: ffff000080324440 x18: 0000000000000014
> >>>>      x17: 00000000388925c0 x16: 000000005386a066 x15: 000000009c10cc2e
> >>>>      x14: 00000000000001c0 x13: 0000000000000001 x12: ffff00007fffb1a0
> >>>>      x11: ffff00007fffb180 x10: ffff80000a4ce508 x9 : 0000000000000041
> >>>>      x8 : ffff80000a4ce500 x7 : ffff80000a4cf920 x6 : 0000000000000001
> >>>>      x5 : 0000000000000001 x4 : 0000000000000007 x3 : 0000000000000002
> >>>>      x2 : 0000000000001000 x1 : ffff80000a4cf928 x0 : 0000000000000001
> >>>>      Call trace:
> >>>>       build_sched_domains+0x284/0x910
> >>>>       sched_init_domains+0xac/0xe0
> >>>>       sched_init_smp+0x48/0xc8
> >>>>       kernel_init_freeable+0x140/0x1ac
> >>>>       kernel_init+0x28/0x140
> >>>>       ret_from_fork+0x10/0x20
> >>>>
> >>>> PATCH[1] Warn about the irregular configuration if required
> >>>> PATCH[2] Enable the validation for aarch64 machines
> >>>> PATCH[3] Enable the validation for riscv machines
> >>>>
> >>>> v3: https://lists.nongnu.org/archive/html/qemu-arm/2023-02/msg01226.html
> >>>> v2: https://lists.nongnu.org/archive/html/qemu-arm/2023-02/msg01080.html
> >>>> v1: https://lists.nongnu.org/archive/html/qemu-arm/2023-02/msg00886.html
> >>>>
> >>>> Changelog
> >>>> =========
> >>>> v4:
> >>>>     * Pick r-b and ack-b from Daniel/Philippe                   (Gavin)
> >>>>     * Replace local variable @len with possible_cpus->len in
> >>>>       validate_cpu_cluster_to_numa_boundary()                   (Philippe)
> >>>> v3:
> >>>>     * Validate cluster-to-NUMA instead of socket-to-NUMA
> >>>>       boundary                                                  (Gavin)
> >>>>     * Move the switch from MachineState to MachineClass         (Philippe)
> >>>>     * Warning instead of rejecting the irregular configuration  (Daniel)
> >>>>     * Comments to mention cluster-to-NUMA is platform instead
> >>>>       of architectural choice                                   (Drew)
> >>>>     * Drop PATCH[v2 1/4] related to qtests/numa-test            (Gavin)
> >>>> v2:
> >>>>     * Fix socket-NUMA-node boundary issues in qtests/numa-test  (Gavin)
> >>>>     * Add helper set_numa_socket_boundary() and validate the
> >>>>       boundary in the generic path                              (Philippe)
> >>>>
> >>>> Gavin Shan (3):
> >>>>     numa: Validate cluster and NUMA node boundary if required
> >>>>     hw/arm: Validate cluster and NUMA node boundary
> >>>>     hw/riscv: Validate cluster and NUMA node boundary
> >>>>
> >>>>    hw/arm/sbsa-ref.c   |  2 ++
> >>>>    hw/arm/virt.c       |  2 ++
> >>>>    hw/core/machine.c   | 42 ++++++++++++++++++++++++++++++++++++++++++
> >>>>    hw/riscv/spike.c    |  2 ++
> >>>>    hw/riscv/virt.c     |  2 ++
> >>>>    include/hw/boards.h |  1 +
> >>>>    6 files changed, 51 insertions(+)
> >>>>  
> >>>
> >>> Acked-by: Igor Mammedov <imammedo@redhat.com>
> >>>  
> >>
> >> Not sure if QEMU v8.0 is still available to integrate this series.
> >> Otherwise, it should be something for QEMU v8.1. By the way, I'm
> >> also uncertain who needs to be merge this series.  
> > 
> > It barely touches arm specific boards, so I'm assuming it will
> > be reviewed and taken by whoever handles hw/core/machine.c
> > 
> > And yes, 8.0 is nearly out the door, this is 8.1 stuff.
> >   
> 
> Indeed. In this case, it needs to be merged via 'Machine core' tree,
> which is being taken care by Eduardo Habkost or Marcel Apfelbaum.
> 
> Eduardo and  Marcel, could you please merge this to QEMU v8.1 when it's
> ready? Thanks in advance.

Lately it was Paolo who taking care of generic machine queue

> 
> Thanks,
> Gavin
>