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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>
This commit is contained in:
Adrian Hunter 2015-09-08 10:58:56 +03:00 committed by Arnaldo Carvalho de Melo
parent fce4d296b4
commit 934e0f2053
1 changed files with 15 additions and 4 deletions
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19
tools/perf/util/evlist.c
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@ -1155,11 +1155,22 @@ int perf_evlist__create_maps(struct perf_evlist *evlist, struct target *target)
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);
}