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

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Message-ID: <YJGifgASdDD7T8Xc@krava>
Date:   Tue, 4 May 2021 21:37:34 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Jin Yao <yao.jin@...ux.intel.com>, 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

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 

jirka

> 
> IMHO.
> 
> - Arnaldo
>