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

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Date:	Thu, 3 Sep 2015 17:41:06 -0300
From:	Arnaldo Carvalho de Melo <acme@...hat.com>
To:	Jiri Olsa <jolsa@...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

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.

- Arnaldo
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