linux-kernel - Re: [PATCH v1 1/2] perf header: Support HYBRID

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Date:   Thu, 6 May 2021 10:22:44 +0800
From:   "Jin, Yao" <yao.jin@...ux.intel.com>
To:     Jiri Olsa <jolsa@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     jolsa@...nel.org, peterz@...radead.org, mingo@...hat.com,
        alexander.shishkin@...ux.intel.com, Linux-kernel@...r.kernel.org,
        ak@...ux.intel.com, kan.liang@...el.com, yao.jin@...el.com
Subject: Re: [PATCH v1 1/2] perf header: Support HYBRID_TOPOLOGY feature

Hi Jiri,

On 5/6/2021 4:28 AM, Jiri Olsa wrote:
> On Wed, May 05, 2021 at 10:49:23AM -0300, Arnaldo Carvalho de Melo wrote:
>> Em Tue, May 04, 2021 at 09:37:34PM +0200, Jiri Olsa escreveu:
>>> On Tue, May 04, 2021 at 04:28:33PM -0300, Arnaldo Carvalho de Melo wrote:
>>>> Em Tue, May 04, 2021 at 04:56:44PM +0200, Jiri Olsa escreveu:
>>>>> On Fri, Apr 30, 2021 at 03:46:01PM +0800, Jin Yao wrote:
>>>>>> It would be useful to let user know the hybrid topology.
>>>>>> Adding HYBRID_TOPOLOGY feature in header to indicate the
>>>>>> core cpus and the atom cpus.
>>>>
>>>>>> With this patch,
>>>>
>>>>>> For the perf.data generated on hybrid platform,
>>>>>> reports the hybrid cpu list.
>>>>
>>>>>>    root@...pl-adl-s-2:~# perf report --header-only -I
>>>>>>    ...
>>>>>>    # cpu_core cpu list : 0-15
>>>>>>    # cpu_atom cpu list : 16-23
>>>>
>>>>> hum, should we print 'hybrid:' or something to make
>>>>> sure its not confused with something else? like
>>>>   
>>>>>    # hybrid cpu_core cpu list : 0-15
>>>>>    # hybrid cpu_atom cpu list : 16-23
>>>>
>>>> But this _core/_atom already got to be enough? I disagreed with that
>>>> naming, but neverthless having one or the other present in an output is
>>>> a clear mark of this hybrid topology.
>>>>
>>>> I.e having that extra hybrid string that wouldn't add information to the
>>>> output.
>>>
>>> sure when you know that cpu_core/cpu_atom are hybrid pmus ;-)
>>> and I guess other arch will come with other names
>>
>> Yeah, its too Intel centric, I thought they would come up with
>> cpu_big/cpu_little and map it to core/atom on Intel and whatever other
>> BIG/little arches come up with.
>>
>> Perhaps:
>>
>> root@...pl-adl-s-2:~# perf report --header-only -I
>> ...
>> # hybrid cpu system:
>> # cpu_core cpu list : 0-15
>> # cpu_atom cpu list : 16-23
>>
>> ?
> 
> 'hybrid pmus' would sounds better to me,
> but as long as there's hybrid in there I'm good ;-)
> 
> thanks,
> jirka
> 

:)

Thanks
Jin Yao

>>
>> - Arnaldo
>>
>