perf tests: Add a testcase for histogram output sorting

With new output fields option, its internal implementation was changed
so add a new testcase to verify whether it breaks things.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Link: http://lkml.kernel.org/r/1400480762-22852-21-git-send-email-namhyung@kernel.org
Signed-off-by: Jiri Olsa <jolsa@kernel.org>

tools/perf/Makefile.perf

@@ -399,6 +399,7 @@ LIB_OBJS += $(OUTPUT)tests/pmu.o
 LIB_OBJS += $(OUTPUT)tests/hists_common.o
 LIB_OBJS += $(OUTPUT)tests/hists_link.o
 LIB_OBJS += $(OUTPUT)tests/hists_filter.o
+LIB_OBJS += $(OUTPUT)tests/hists_output.o
 LIB_OBJS += $(OUTPUT)tests/python-use.o
 LIB_OBJS += $(OUTPUT)tests/bp_signal.o
 LIB_OBJS += $(OUTPUT)tests/bp_signal_overflow.o

tools/perf/tests/builtin-test.c

@@ -135,6 +135,10 @@ static struct test {
 		.desc = "Test thread mg sharing",
 		.func = test__thread_mg_share,
 	},
+	{
+		.desc = "Test output sorting of hist entries",
+		.func = test__hists_output,
+	},
 	{
 		.func = NULL,
 	},

tools/perf/tests/hists_common.c

@@ -193,8 +193,8 @@ void print_hists_out(struct hists *hists)
 		he = rb_entry(node, struct hist_entry, rb_node);
 
 		if (!he->filtered) {
-			pr_info("%2d: entry: %-8s [%-8s] %20s: period = %"PRIu64"\n",
-				i, thread__comm_str(he->thread),
+			pr_info("%2d: entry: %8s:%5d [%-8s] %20s: period = %"PRIu64"\n",
+				i, thread__comm_str(he->thread), he->thread->tid,
 				he->ms.map->dso->short_name,
 				he->ms.sym->name, he->stat.period);
 		}

tools/perf/tests/hists_filter.c

@@ -283,6 +283,7 @@ int test__hists_filter(void)
 out:
 	/* tear down everything */
 	perf_evlist__delete(evlist);
+	reset_output_field();
 	machines__exit(&machines);
 
 	return err;

tools/perf/tests/hists_link.c

@@ -332,6 +332,7 @@ int test__hists_link(void)
 out:
 	/* tear down everything */
 	perf_evlist__delete(evlist);
+	reset_output_field();
 	machines__exit(&machines);
 
 	return err;

tools/perf/tests/tests.h

@@ -44,6 +44,7 @@ int test__dwarf_unwind(void);
 int test__hists_filter(void);
 int test__mmap_thread_lookup(void);
 int test__thread_mg_share(void);
+int test__hists_output(void);
 
 #if defined(__x86_64__) || defined(__i386__) || defined(__arm__)
 #ifdef HAVE_DWARF_UNWIND_SUPPORT