[RFC PATCH 2/6] mm/damon/tests/core-kunit: add damon_commit_probes() test

[SJ Park <sj@kernel.org>]

Add kunit test to ensure damon_commit_probes() updates destination DAMON
context with source probes as expected.

Signed-off-by: SJ Park <sj@kernel.org>
---
 mm/damon/tests/core-kunit.h | 81 +++++++++++++++++++++++++++++++++++++
 1 file changed, 81 insertions(+)

diff --git a/mm/damon/tests/core-kunit.h b/mm/damon/tests/core-kunit.h
index ff864402e9c75..d1e8c612fea03 100644
--- a/mm/damon/tests/core-kunit.h
+++ b/mm/damon/tests/core-kunit.h
@@ -1393,6 +1393,86 @@ static void damon_test_commit_filter(struct kunit *test)
 			});
 }
 
+static struct damon_ctx *damon_test_help_setup_probes(unsigned int weights[],
+		int nr_weights)
+{
+	struct damon_ctx *ctx;
+	struct damon_probe *probe;
+	int i;
+
+	ctx = damon_new_ctx();
+	if (!ctx)
+		return NULL;
+	for (i = 0; i < nr_weights; i++) {
+		probe = damon_new_probe();
+		if (!probe) {
+			damon_destroy_ctx(ctx);
+			return NULL;
+		}
+		probe->weight = weights[i];
+		damon_add_probe(ctx, probe);
+	}
+	return ctx;
+}
+
+static void damon_test_commit_probes_for(struct kunit *test,
+		unsigned int dst_weights[], int nr_dst_probes,
+		unsigned int src_weights[], int nr_src_probes)
+{
+	struct damon_ctx *dst, *src;
+	int err;
+	struct damon_probe *dst_probe, *src_probe;
+
+	dst = damon_test_help_setup_probes(dst_weights, nr_dst_probes);
+	if (!dst)
+		kunit_skip(test, "dst alloc fail");
+	src = damon_test_help_setup_probes(src_weights, nr_src_probes);
+	if (!src) {
+		damon_destroy_ctx(dst);
+		kunit_skip(test, "src alloc fail");
+	}
+
+	err = damon_commit_probes(dst, src);
+	KUNIT_EXPECT_EQ(test, err, 0);
+	if (err)
+		return;
+	nr_dst_probes = 0;
+	damon_for_each_probe(dst_probe, dst)
+		nr_dst_probes++;
+	nr_src_probes = 0;
+	damon_for_each_probe(src_probe, src)
+		nr_src_probes++;
+	KUNIT_EXPECT_EQ(test, nr_dst_probes, nr_src_probes);
+	nr_dst_probes = 0;
+	damon_for_each_probe(dst_probe, dst) {
+		src_probe = damon_nth_probe(nr_dst_probes, src);
+		KUNIT_EXPECT_EQ(test, src_probe->weight, dst_probe->weight);
+		nr_dst_probes++;
+	}
+	damon_destroy_ctx(dst);
+	damon_destroy_ctx(src);
+}
+
+static void damon_test_commit_probes(struct kunit *test)
+{
+	damon_test_commit_probes_for(test,
+			(unsigned int[]){}, 0, (unsigned int[]){}, 0);
+	damon_test_commit_probes_for(test,
+			(unsigned int[]){}, 0, (unsigned int[]){1}, 1);
+	damon_test_commit_probes_for(test,
+			(unsigned int[]){}, 0, (unsigned int[]){1, 2}, 2);
+	damon_test_commit_probes_for(test,
+			(unsigned int[]){1}, 1, (unsigned int[]){2}, 1);
+	damon_test_commit_probes_for(test,
+			(unsigned int[]){1}, 1, (unsigned int[]){2, 3}, 2);
+	damon_test_commit_probes_for(test,
+			(unsigned int[]){2, 3}, 2, (unsigned int[]){1}, 1);
+	damon_test_commit_probes_for(test,
+			(unsigned int[]){2, 3}, 2, (unsigned int[]){}, 0);
+	damon_test_commit_probes_for(test,
+			(unsigned int[]){2}, 1, (unsigned int[]){}, 0);
+}
+
 static void damon_test_commit_ctx(struct kunit *test)
 {
 	struct damon_ctx *src, *dst;
@@ -1745,6 +1825,7 @@ static struct kunit_case damon_test_cases[] = {
 	KUNIT_CASE(damos_test_commit_migrate_hot),
 	KUNIT_CASE(damon_test_commit_target_regions),
 	KUNIT_CASE(damon_test_commit_filter),
+	KUNIT_CASE(damon_test_commit_probes),
 	KUNIT_CASE(damon_test_commit_ctx),
 	KUNIT_CASE(damos_test_filter_out),
 	KUNIT_CASE(damon_test_feed_loop_next_input),
-- 
2.47.3