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| author | Adrian Hunter <adrian.hunter@intel.com> | 2015-09-08 10:58:56 +0300 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2015-09-15 10:44:22 -0300 |
| commit | 934e0f2053ce299893ca48a411bf7fdc8ac6254f (patch) | |
| tree | 1e30f1d040c4cd5392d6eb6b4e46b2735d11a291 /tools | |
| parent | fce4d296b405b03fba033a55017348bf55b10db6 (diff) | |
| download | lwn-934e0f2053ce299893ca48a411bf7fdc8ac6254f.tar.gz lwn-934e0f2053ce299893ca48a411bf7fdc8ac6254f.zip | |
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@intel.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@intel.com>
Link: http://lkml.kernel.org/r/1441699142-18905-9-git-send-email-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools')
| -rw-r--r-- | tools/perf/util/evlist.c | 19 |
1 files changed, 15 insertions, 4 deletions
diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c index 5bd3b49452c6..78ff52ee8788 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); } |