[PATCH v2 7/7] selftest: sync: stress test for merges

[Emilio López]

This test is based on the libsync test suite from Android.
This commit includes a test to stress merge operations.

Signed-off-by: Emilio López <emilio.lopez at collabora.co.uk>
---
 tools/testing/selftests/sync/Makefile            |   1 +
 tools/testing/selftests/sync/sync_stress_merge.c | 115 +++++++++++++++++++++++
 tools/testing/selftests/sync/sync_test.c         |   1 +
 tools/testing/selftests/sync/synctest.h          |   3 +
 4 files changed, 120 insertions(+)
 create mode 100644 tools/testing/selftests/sync/sync_stress_merge.c

diff --git a/tools/testing/selftests/sync/Makefile b/tools/testing/selftests/sync/Makefile
index 20428d5..87ac400 100644
--- a/tools/testing/selftests/sync/Makefile
+++ b/tools/testing/selftests/sync/Makefile
@@ -16,6 +16,7 @@ TESTS += sync_merge.o
 TESTS += sync_wait.o
 TESTS += sync_stress_parallelism.o
 TESTS += sync_stress_consumer.o
+TESTS += sync_stress_merge.o
 
 sync_test: $(OBJS) $(TESTS)
 
diff --git a/tools/testing/selftests/sync/sync_stress_merge.c b/tools/testing/selftests/sync/sync_stress_merge.c
new file mode 100644
index 0000000..99e83ef
--- /dev/null
+++ b/tools/testing/selftests/sync/sync_stress_merge.c
@@ -0,0 +1,115 @@
+/*
+ *  sync stress test: merging
+ *  Copyright 2015-2016 Collabora Ltd.
+ *
+ *  Based on the implementation from the Android Open Source Project,
+ *
+ *  Copyright 2012 Google, Inc
+ *
+ *  Permission is hereby granted, free of charge, to any person obtaining a
+ *  copy of this software and associated documentation files (the "Software"),
+ *  to deal in the Software without restriction, including without limitation
+ *  the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ *  and/or sell copies of the Software, and to permit persons to whom the
+ *  Software is furnished to do so, subject to the following conditions:
+ *
+ *  The above copyright notice and this permission notice shall be included in
+ *  all copies or substantial portions of the Software.
+ *
+ *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ *  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ *  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ *  THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ *  OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ *  ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ *  OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+
+#include "sync.h"
+#include "sw_sync.h"
+#include "synctest.h"
+
+int test_merge_stress_random_merge(void)
+{
+	int i, size, ret;
+	int timeline_count = 32;
+	int merge_count = 1024 * 32;
+	int timelines[timeline_count];
+	int fence_map[timeline_count];
+	int fence, tmpfence, merged, valid;
+	int timeline, timeline_offset, sync_point;
+
+	srand(time(NULL));
+
+	for (i = 0; i < timeline_count; i++)
+		timelines[i] = sw_sync_timeline_create();
+
+	fence = sw_sync_fence_create(timelines[0], "fence", 0);
+	valid = sw_sync_fence_is_valid(fence);
+	ASSERT(valid, "Failure creating fence\n");
+
+	memset(fence_map, -1, sizeof(fence_map));
+	fence_map[0] = 0;
+
+	/*
+	 * Randomly create sync_points out of a fixed set of timelines,
+	 * and merge them together
+	 */
+	for (i = 0; i < merge_count; i++) {
+		/* Generate sync_point. */
+		timeline_offset = rand() % timeline_count;
+		timeline = timelines[timeline_offset];
+		sync_point = rand();
+
+		/* Keep track of the latest sync_point in each timeline. */
+		if (fence_map[timeline_offset] == -1)
+			fence_map[timeline_offset] = sync_point;
+		else if (fence_map[timeline_offset] < sync_point)
+			fence_map[timeline_offset] = sync_point;
+
+		/* Merge */
+		tmpfence = sw_sync_fence_create(timeline, "fence", sync_point);
+		merged = sync_merge("merge", tmpfence, fence);
+		sw_sync_fence_destroy(tmpfence);
+		sw_sync_fence_destroy(fence);
+		fence = merged;
+
+		valid = sw_sync_fence_is_valid(merged);
+		ASSERT(valid, "Failure creating fence i\n");
+	}
+
+	size = 0;
+	for (i = 0; i < timeline_count; i++)
+		if (fence_map[i] != -1)
+			size++;
+
+	/* Confirm our map matches the fence. */
+	ASSERT(sync_fence_size(fence) == size,
+	       "Quantity of elements not matching\n");
+
+	/* Trigger the merged fence */
+	for (i = 0; i < timeline_count; i++) {
+		if (fence_map[i] != -1) {
+			ret = sync_wait(fence, 0);
+			ASSERT(ret == 0,
+			       "Failure waiting on fence until timeout\n");
+			/* Increment the timeline to the last sync_point */
+			sw_sync_timeline_inc(timelines[i], fence_map[i]);
+		}
+	}
+
+	/* Check that the fence is triggered. */
+	ret = sync_wait(fence, 0);
+	ASSERT(ret > 0, "Failure triggering fence\n");
+
+	sw_sync_fence_destroy(fence);
+
+	for (i = 0; i < timeline_count; i++)
+		sw_sync_timeline_destroy(timelines[i]);
+
+	return 0;
+}
diff --git a/tools/testing/selftests/sync/sync_test.c b/tools/testing/selftests/sync/sync_test.c
index 32f2534..9ea08d9 100644
--- a/tools/testing/selftests/sync/sync_test.c
+++ b/tools/testing/selftests/sync/sync_test.c
@@ -68,6 +68,7 @@ int main(void)
 	err += RUN_TEST(test_fence_multi_timeline_wait);
 	err += RUN_TEST(test_stress_two_threads_shared_timeline);
 	err += RUN_TEST(test_consumer_stress_multi_producer_single_consumer);
+	err += RUN_TEST(test_merge_stress_random_merge);
 
 	if (err)
 		printf("[FAIL]\tsync errors: %d\n", err);
diff --git a/tools/testing/selftests/sync/synctest.h b/tools/testing/selftests/sync/synctest.h
index a94b622..4e0e59f 100644
--- a/tools/testing/selftests/sync/synctest.h
+++ b/tools/testing/selftests/sync/synctest.h
@@ -60,4 +60,7 @@ int test_stress_two_threads_shared_timeline(void);
 /* Stress test - consumer */
 int test_consumer_stress_multi_producer_single_consumer(void);
 
+/* Stress test - merging */
+int test_merge_stress_random_merge(void);
+
 #endif
-- 
2.10.1