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perf tests: Fix map_groups refcount test

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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: b91fc39f4a ("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>
This commit is contained in:
Arnaldo Carvalho de Melo 2015-05-11 18:13:14 -03:00
parent 0ceb8f6e6c
commit 8b00f46951
1 changed files with 12 additions and 5 deletions
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17
tools/perf/tests/thread-mg-share.c
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@ -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;
}