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

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Message-ID: <b2aa6227-90e6-81dc-f629-1d5221f2cae5@linux.intel.com>
Date:   Thu, 6 May 2021 10:17:29 +0800
From:   "Jin, Yao" <yao.jin@...ux.intel.com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...hat.com>
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 Arnaldo,

On 5/5/2021 9:49 PM, 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
> 
> ?
>

That's a good idea! :)

On my ADL test machine, it's now output like:

# hybrid cpu system:
# cpu_core cpu list : 0-15
# cpu_atom cpu list : 16-23

Thanks
Jin Yao

> - Arnaldo
>