linux-kernel - Re: [PATCH 22/25] perf tools: Add perf_evlist_

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Date:	Mon, 28 Sep 2015 17:14:42 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Adrian Hunter <adrian.hunter@...el.com>
Cc:	Jiri Olsa <jolsa@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 22/25] perf tools: Add perf_evlist__del()

Em Mon, Sep 28, 2015 at 10:33:32AM -0300, Arnaldo Carvalho de Melo escreveu:
> Em Fri, Sep 25, 2015 at 04:15:53PM +0300, Adrian Hunter escreveu:
> > Add a counterpart to perf_evlist__add() that does the opposite
> > and deletes the evsel.
> > 
> > This will be used by perf inject to remove unwanted evsels
> 
> I think perf_evsel__remove() is better, as __del() looks like a shortcut
> for __delete(), which has different semantics than removing an entry
> from a list.
> 
> I'll fix up the patches.

Ouch, but it also deletes the evsel, I think in this case it is better
to either have a perf_evlist__delete_evsel() or plain use
perf_evlist__remove() + perf_evsel__delete(). Doing the later, we can
rediscuss if you feel strongly about it.

- Arnaldo
 
> - Arnaldo
>  
> > Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
> > ---
> >  tools/perf/util/evlist.c | 8 ++++++++
> >  tools/perf/util/evlist.h | 1 +
> >  2 files changed, 9 insertions(+)
> > 
> > diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
> > index e6760380d731..0bb15e6d12a0 100644
> > --- a/tools/perf/util/evlist.c
> > +++ b/tools/perf/util/evlist.c
> > @@ -165,6 +165,14 @@ void perf_evlist__add(struct perf_evlist *evlist, struct perf_evsel *entry)
> >  	__perf_evlist__propagate_maps(evlist, entry);
> >  }
> >  
> > +void perf_evlist__del(struct perf_evlist *evlist, struct perf_evsel *evsel)
> > +{
> > +	evsel->evlist = NULL;
> > +	list_del_init(&evsel->node);
> > +	evlist->nr_entries -= 1;
> > +	perf_evsel__delete(evsel);
> > +}
> > +
> >  void perf_evlist__splice_list_tail(struct perf_evlist *evlist,
> >  				   struct list_head *list)
> >  {
> > diff --git a/tools/perf/util/evlist.h b/tools/perf/util/evlist.h
> > index 0edf0d4f4efa..7fab57d85fa1 100644
> > --- a/tools/perf/util/evlist.h
> > +++ b/tools/perf/util/evlist.h
> > @@ -73,6 +73,7 @@ void perf_evlist__exit(struct perf_evlist *evlist);
> >  void perf_evlist__delete(struct perf_evlist *evlist);
> >  
> >  void perf_evlist__add(struct perf_evlist *evlist, struct perf_evsel *entry);
> > +void perf_evlist__del(struct perf_evlist *evlist, struct perf_evsel *evsel);
> >  int perf_evlist__add_default(struct perf_evlist *evlist);
> >  int __perf_evlist__add_default_attrs(struct perf_evlist *evlist,
> >  				     struct perf_event_attr *attrs, size_t nr_attrs);
> > -- 
> > 1.9.1
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