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

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Date:   Wed, 5 May 2021 10:49:23 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Jiri Olsa <jolsa@...hat.com>
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

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

?

- Arnaldo