Commit-ID: 934e0f2053ce299893ca48a411bf7fdc8ac6254f
Gitweb: http://git.kernel.org/tip/934e0f2053ce299893ca48a411bf7fdc8ac6254f
Author: Adrian Hunter <adrian.hunter@xxxxxxxxx>
AuthorDate: Tue, 8 Sep 2015 10:58:56 +0300
Committer: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
CommitDate: Tue, 15 Sep 2015 10:44:22 -0300
perf evlist: Make set_maps() more resilient
Make perf_evlist__set_maps() more resilient by allowing for the
possibility that one or another of the maps isn't being changed and
therefore should not be "put".
Signed-off-by: Adrian Hunter <adrian.hunter@xxxxxxxxx>
Acked-by: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Kan Liang <kan.liang@xxxxxxxxx>
Link: http://lkml.kernel.org/r/1441699142-18905-9-git-send-email-adrian.hunter@xxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
tools/perf/util/evlist.c | 19 +++++++++++++++----
1 file changed, 15 insertions(+), 4 deletions(-)
diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
index 5bd3b49..78ff52e 100644
--- a/tools/perf/util/evlist.c
+++ b/tools/perf/util/evlist.c
@@ -1155,11 +1155,22 @@ out_delete_threads:
void perf_evlist__set_maps(struct perf_evlist *evlist, struct cpu_map *cpus,
struct thread_map *threads)
{
- cpu_map__put(evlist->cpus);
- evlist->cpus = cpus;
+ /*
+ * Allow for the possibility that one or another of the maps isn't being
+ * changed i.e. don't put it. Note we are assuming the maps that are
+ * being applied are brand new and evlist is taking ownership of the
+ * original reference count of 1. If that is not the case it is up to
+ * the caller to increase the reference count.
+ */
+ if (cpus != evlist->cpus) {
+ cpu_map__put(evlist->cpus);
+ evlist->cpus = cpus;
+ }
- thread_map__put(evlist->threads);
- evlist->threads = threads;
+ if (threads != evlist->threads) {
+ thread_map__put(evlist->threads);
+ evlist->threads = threads;
+ }
perf_evlist__propagate_maps(evlist);
}
--
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