Re: [PATCH v8 2/5] qtest/numa-test: Specify CPU topology in aarch64_numa_cpu()

[Igor Mammedov <imammedo@redhat.com>]

On Mon, 2 May 2022 18:07:00 +0800
Gavin Shan <gshan@redhat.com> wrote:

> Hi Igor,
> 
> On 5/2/22 4:52 PM, Igor Mammedov wrote:
> > On Mon, 25 Apr 2022 11:27:59 +0800
> > Gavin Shan <gshan@redhat.com> wrote:
> >   
> >> The CPU topology isn't enabled on arm/virt machine yet, but we're
> >> going to do it in next patch. After the CPU topology is enabled by
> >> next patch, "thrad-id=1" becomes invalid because the CPU core is  
> >                   ^^^ typo
> >   
> 
> hmm, my bad. Lets fix it in next revision.
> 
> >> preferred on arm/virt machine. It means these two CPUs have 0/1
> >> as their core IDs, but their thread IDs are all 0. It will trigger
> >> test failure as the following message indicates:
> >>
> >>    [14/21 qemu:qtest+qtest-aarch64 / qtest-aarch64/numa-test  ERROR
> >>    1.48s   killed by signal 6 SIGABRT  
> >>    >>> G_TEST_DBUS_DAEMON=/home/gavin/sandbox/qemu.main/tests/dbus-vmstate-daemon.sh \  
> >>        QTEST_QEMU_STORAGE_DAEMON_BINARY=./storage-daemon/qemu-storage-daemon         \
> >>        QTEST_QEMU_BINARY=./qemu-system-aarch64                                       \
> >>        QTEST_QEMU_IMG=./qemu-img MALLOC_PERTURB_=83                                  \
> >>        /home/gavin/sandbox/qemu.main/build/tests/qtest/numa-test --tap -k
> >>    ――――――――――――――――――――――――――――――――――――――――――――――
> >>    stderr:
> >>    qemu-system-aarch64: -numa cpu,node-id=0,thread-id=1: no match found
> >>
> >> This fixes the issue by providing comprehensive SMP configurations
> >> in aarch64_numa_cpu(). The SMP configurations aren't used before
> >> the CPU topology is enabled in next patch.
> >>
> >> Signed-off-by: Gavin Shan <gshan@redhat.com>
> >> Reviewed-by: Yanan Wang <wangyanan55@huawei.com>
> >> ---
> >>   tests/qtest/numa-test.c | 3 ++-
> >>   1 file changed, 2 insertions(+), 1 deletion(-)
> >>
> >> diff --git a/tests/qtest/numa-test.c b/tests/qtest/numa-test.c
> >> index 90bf68a5b3..aeda8c774c 100644
> >> --- a/tests/qtest/numa-test.c
> >> +++ b/tests/qtest/numa-test.c
> >> @@ -223,7 +223,8 @@ static void aarch64_numa_cpu(const void *data)
> >>       QTestState *qts;
> >>       g_autofree char *cli = NULL;
> >>   
> >> -    cli = make_cli(data, "-machine smp.cpus=2 "
> >> +    cli = make_cli(data, "-machine "
> >> +        "smp.cpus=2,smp.sockets=1,smp.clusters=1,smp.cores=1,smp.threads=2 "
> >>           "-numa node,nodeid=0,memdev=ram -numa node,nodeid=1 "
> >>           "-numa cpu,node-id=1,thread-id=0 "  
> >                                  ^^^^
> > make it sensible as well, i.e. socket/cluster/cores-ids ...
> >   
> 
> Could you help if the following command lines are what you want? I don't
> think we can do it. Without PATCH[v8 3/5] applied, {socket,cluster,core}-id
> are invalid from arm/virt machine side and we will run into errors.
you are right, you can only fix -numa after 3/5

btw: 
splitting threads between several numa nodes here probably is unreal
configuration. Should be fixed in follow up patches.

>       -machine                                                           \
>       smp.cpus=2,smp.sockets=1,smp.clusters=1,smp.cores=1,smp.threads=2  \
>       -numa node,nodeid=0,memdev=ram -numa node,nodeid=1                 \
>       -numa cpu,node-id=1,socket-id=0,cluster-id=0,core-id=0,thread-id=0 \
>       -numa cpu,node-id=0,socket-id=0,cluster-id=0,core-id=0,thread-id=1
>      
>       # make -j 10 check
>         :
>       >>> QTEST_QEMU_IMG=./qemu-img MALLOC_PERTURB_=237                        \  
>          QTEST_QEMU_STORAGE_DAEMON_BINARY=./storage-daemon/qemu-storage-daemon \
>          QTEST_QEMU_BINARY=./qemu-system-aarch64                               \
>          G_TEST_DBUS_DAEMON=/home/gavin/sandbox/qemu.main/tests/dbus-vmstate-daemon.sh \
>          /home/gavin/sandbox/qemu.main/build/tests/qtest/numa-test --tap -k
>      ―――――――――――――――――――――――――――――――――――――――――――――― ✀  ――――――――――――――――――――――――――――――――――――――――――――――
>      stderr:
>      qemu-system-aarch64: -numa cpu,node-id=1,socket-id=0,cluster-id=0,core-id=0,thread-id=0: core-id is not supported
>      Broken pipe
> 
>      (The error is reported from hw/core/machine.c::machine_set_cpu_numa_node())
> 
> By the way, could you also help to check if the following patches look
> good to you? I hope to make next revision eligible for merge :)
> 
>      [PATCH v8 1/5] qapi/machine.json: Add cluster-id
>      [PATCH v8 3/5] hw/arm/virt: Consider SMP configuration in CPU topology
> 
> >>           "-numa cpu,node-id=0,thread-id=1");  
> >   
> 
> Thanks,
> Gavin
>