perf evlist: Add perf_evlist__remove()

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.
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Link: http://lkml.kernel.org/r/1443186956-18718-23-git-send-email-adrian.hunter@intel.com
[ Renamed it from perf_evlist__del() to perf_evlist__remove() and removed the perf_evsel__delete() call ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/evlist.c

@@ -165,6 +165,13 @@ void perf_evlist__add(struct perf_evlist *evlist, struct perf_evsel *entry)
 	__perf_evlist__propagate_maps(evlist, entry);
 }
 
+void perf_evlist__remove(struct perf_evlist *evlist, struct perf_evsel *evsel)
+{
+	evsel->evlist = NULL;
+	list_del_init(&evsel->node);
+	evlist->nr_entries -= 1;
+}
+
 void perf_evlist__splice_list_tail(struct perf_evlist *evlist,
 				   struct list_head *list)
 {

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__remove(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);