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Re: [Xen-devel] [PATCH v2 2/2] xen: fill topology info for all present cpus


  • To: Jan Beulich <JBeulich@xxxxxxxx>
  • From: Juergen Gross <jgross@xxxxxxxx>
  • Date: Tue, 4 Sep 2018 09:38:53 +0200
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  • Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>, Wei Liu <wei.liu2@xxxxxxxxxx>, George Dunlap <George.Dunlap@xxxxxxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>, Tim Deegan <tim@xxxxxxx>, xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
  • Delivery-date: Tue, 04 Sep 2018 07:39:04 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
  • Openpgp: preference=signencrypt

On 03/09/18 15:41, Jan Beulich wrote:
>>>> On 31.08.18 at 17:22, <jgross@xxxxxxxx> wrote:
>> The topology information obtainable via XEN_SYSCTL_cputopoinfo is
>> filled rather weird: the size of the array is derived from the highest
>> online cpu number, so in case there are trailing offline cpus they
>> will not be included.
>>
>> On a dual core system with 4 threads booted with smt=0 without this
>> patch xl info -n will print:
>>
>> cpu_topology           :
>> cpu:    core    socket     node
>>   0:       0        0        0
>>   1:       0        0        0
>>   2:       1        0        0
>>
>> while with this patch the output is:
>>
>> cpu_topology           :
>> cpu:    core    socket     node
>>   0:       0        0        0
>>   1:       0        0        0
>>   2:       1        0        0
>>   3:       1        0        0
>>
>> Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
> 
> Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
> for x86. I'd like this to have an ARM ack as well, though, for
> there possibly being differences in how cpu_present_map is
> handled in their case. In particular I notice that the only access
> to the variable is in smp_prepare_cpus().

How relevant is that information for arm at all?

cpu_to_core(i) et al always return 0. So topology information is not
really helpful.


Juergen

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