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perf tests: Show refcounting broken expectations in thread-mg-share test

tip:perf/core tip-bot for Arnaldo Carvalho de Melo 1 participant 1 message May 15, 2015 perf events

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Commit-ID:  8f1960138baf8a6c139917ecbc032e7916d109ef
Gitweb:     http://git.kernel.org/tip/8f1960138baf8a6c139917ecbc032e7916d109ef
Author:     Arnaldo Carvalho de Melo <[email protected]>
AuthorDate: Mon, 11 May 2015 16:30:20 -0300
Committer:  Arnaldo Carvalho de Melo <[email protected]>
CommitDate: Tue, 12 May 2015 09:59:51 -0300

perf tests: Show refcounting broken expectations in thread-mg-share test

To help understand the failure.

[acme@zoo linux]$ perf test -v 30
30: Test thread mg sharing :
--- start ---
test child forked, pid 12275

  FAILED tests/thread-mg-share.c:68 wrong refcnt (4 != 3)
  test child finished with -1
  ---- end ----
  Test thread mg sharing: FAILED!
  [acme@zoo linux]$

This is under investigation, the thread__delete() calls were replaced with thread__put(), and those cause mismatches because now we need to be more judicious with the thread lifetime management.

I.e. previously the thread__delete() would drop the map_group refcount, but now since thread__put doesn't call thread__delete() necessarily. because we have other refcount holders, the map_group refcount will not be as we expected when this test was implemented.

Will be fixed soon...

Cc Adrian Hunter <[email protected]>
Cc Borislav Petkov <[email protected]>
Cc David Ahern <[email protected]>
Cc Don Zickus <[email protected]>
Cc Frederic Weisbecker <[email protected]>
Cc Jiri Olsa <[email protected]>
Cc Namhyung Kim <[email protected]>
Cc Stephane Eranian <[email protected]>
Link http://lkml.kernel.org/n/[email protected] open here
Signed-off-by Arnaldo Carvalho de Melo <[email protected]>
---
 tools/perf/tests/tests.h           |  9 +++++++++
 tools/perf/tests/thread-mg-share.c | 12 ++++++------
 2 files changed, 15 insertions(+), 6 deletions(-)
tools/perf/tests/tests.h +9 -0
index 52758a3..a10eaf5 100644
@@ -9,6 +9,15 @@ do {									 \
 	}								 \
 } while (0)
 
+#define TEST_ASSERT_EQUAL(text, val, expected)				 \
+do {									 \
+	if (val != expected) {						 \
+		pr_debug("FAILED %s:%d %s (%d != %d)\n",		 \
+			 __FILE__, __LINE__, text, val, expected);	 \
+		return -1;						 \
+	}								 \
+} while (0)
+
 enum {
 	TEST_OK   =  0,
 	TEST_FAIL = -1,
tools/perf/tests/thread-mg-share.c +6 -6
index dc05bd6..04eccee 100644
@@ -43,7 +43,7 @@ int test__thread_mg_share(void)
 			leader && t1 && t2 && t3 && other);
 
 	mg = leader->mg;
-	TEST_ASSERT_VAL("wrong refcnt", mg->refcnt == 4);
+	TEST_ASSERT_EQUAL("wrong refcnt", mg->refcnt, 4);
 
 	/* test the map groups pointer is shared */
 	TEST_ASSERT_VAL("map groups don't match", mg == t1->mg);

@@ -59,25 +59,25 @@ int test__thread_mg_share(void)
 	TEST_ASSERT_VAL("failed to find other leader", other_leader);
 
 	other_mg = other->mg;
-	TEST_ASSERT_VAL("wrong refcnt", other_mg->refcnt == 2);
+	TEST_ASSERT_EQUAL("wrong refcnt", other_mg->refcnt, 2);
 
 	TEST_ASSERT_VAL("map groups don't match", other_mg == other_leader->mg);
 
 	/* release thread group */
 	thread__put(leader);
-	TEST_ASSERT_VAL("wrong refcnt", mg->refcnt == 3);
+	TEST_ASSERT_EQUAL("wrong refcnt", mg->refcnt, 3);
 
 	thread__put(t1);
-	TEST_ASSERT_VAL("wrong refcnt", mg->refcnt == 2);
+	TEST_ASSERT_EQUAL("wrong refcnt", mg->refcnt, 2);
 
 	thread__put(t2);
-	TEST_ASSERT_VAL("wrong refcnt", mg->refcnt == 1);
+	TEST_ASSERT_EQUAL("wrong refcnt", mg->refcnt, 1);
 
 	thread__put(t3);
 
 	/* release other group  */
 	thread__put(other_leader);
-	TEST_ASSERT_VAL("wrong refcnt", other_mg->refcnt == 1);
+	TEST_ASSERT_EQUAL("wrong refcnt", other_mg->refcnt, 1);
 
 	thread__put(other);