perf tests: Fix map_groups refcount test

When introducing reference counting for struct thread instances I forgot
to remove the synthetic threads from the machine's rbtree so that it
then the threads would have just one reference and thus the
thread__put() replacing the thread__delete() really turns into a
thread__delete() (thread->refcnt == 1 at thread__put() time) and thus
drop the thread->mg refcount, as expected by the this test.

Fix it by calling machine__remove_thread() (the counterpart of
machine__findnew_thread()) on all the synthetic threads after the
checks that involves the rbtree were done.

Before:

  # perf test -v mg
  30: Test thread mg sharing                                 :
  --- start ---
  test child forked, pid 26995
  FAILED tests/thread-mg-share.c:68 wrong refcnt (4 != 3)
  test child finished with -1
  ---- end ----
  Test thread mg sharing: FAILED!
  #

After:

  # perf test mg
  30: Test thread mg sharing: Ok
  #

Fixes: b91fc39f4ad7 ("perf machine: Protect the machine->threads with a rwlock")
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Borislav Petkov <bp@suse.de>
Cc: David Ahern <dsahern@gmail.com>
Cc: Don Zickus <dzickus@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-uoqq0fjei90ohhhcboz6ay33@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/tests/thread-mg-share.c b/tools/perf/tests/thread-mg-share.c
index 04eccee..c0ed56f 100644 (file)
--- a/tools/perf/tests/thread-mg-share.c
+++ b/tools/perf/tests/thread-mg-share.c
@@ -58,6 +58,18 @@ int test__thread_mg_share(void)
        other_leader = machine__find_thread(machine, 4, 4);
        TEST_ASSERT_VAL("failed to find other leader", other_leader);
 
+       /*
+        * Ok, now that all the rbtree related operations were done,
+        * lets remove all of them from there so that we can do the
+        * refcounting tests.
+        */
+       machine__remove_thread(machine, leader);
+       machine__remove_thread(machine, t1);
+       machine__remove_thread(machine, t2);
+       machine__remove_thread(machine, t3);
+       machine__remove_thread(machine, other);
+       machine__remove_thread(machine, other_leader);
+
        other_mg = other->mg;
        TEST_ASSERT_EQUAL("wrong refcnt", other_mg->refcnt, 2);
 
@@ -81,11 +93,6 @@ int test__thread_mg_share(void)
 
        thread__put(other);
 
-       /*
-        * Cannot call machine__delete_threads(machine) now,
-        * because we've already released all the threads.
-        */
-
        machines__exit(&machines);
        return 0;
 }