linux-kernel - Re: [tip:perf/urgent] perf evlist: Open event on evsel cpus and threads

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Date:	Fri, 4 Sep 2015 09:05:07 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	Arnaldo Carvalho de Melo <acme@...hat.com>
Cc:	Adrian Hunter <adrian.hunter@...el.com>, kan.liang@...el.com,
	mingo@...nel.org, jolsa@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [tip:perf/urgent] perf evlist: Open event on evsel cpus and
 threads

On Thu, Sep 03, 2015 at 05:41:06PM -0300, Arnaldo Carvalho de Melo wrote:
> Em Thu, Sep 03, 2015 at 08:19:39PM +0200, Jiri Olsa escreveu:
> > On Thu, Sep 03, 2015 at 01:41:09PM -0300, Arnaldo Carvalho de Melo wrote:
> > > Em Thu, Sep 03, 2015 at 07:23:43PM +0300, Adrian Hunter escreveu:
> > > > On 3/09/2015 6:27 p.m., Arnaldo Carvalho de Melo wrote:
> > > > >Em Thu, Sep 03, 2015 at 04:34:24PM +0300, Adrian Hunter escreveu:
> > > > >>On 01/09/15 11:31, tip-bot for Kan Liang wrote:
> > > > >Something we could catch in a 'test' entry? Even if that required Intel
> > > > >PT hardware that would be something important to have, all this stuff is
> > > > >growing in complexity, we need those tests...
> 
> > > > There is "Test tracking with sched_switch" but you need to expose it
> > > > to the same issue i.e.
> 
> > > Sure, Kan and Jiri were talking about the need to go doing these
> > > changes, Jiri? Kan?
>  
> > perf_evlist__propagate_maps is called from perf_evlist__create_maps,
> > so if evsel is added later it will not be affected, perhaps we need
> > something like below:
> 
> > +++ b/tools/perf/util/evlist.c
> > @@ -133,6 +133,9 @@ void perf_evlist__add(struct perf_evlist *evlist, struct perf_evsel *entry)
> >  
> >  	if (!evlist->nr_entries++)
> >  		perf_evlist__set_id_pos(evlist);
> > +
> > +	entry->cpus = cpu_map__get(evlist->cpus);
> > +	entry->threads = thread_map__get(evlist->threads);
> 
> You can't simply do that, we need to do it only if those fields are not
> already set.

argh, right.. forgot about cpus setup.. anyway, Adrian already wanted
to do single function for this and the propagate function

jirka
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