1 files changed, 62 insertions, 0 deletions
diff --git a/tools/testing/selftests/sched_ext/select_cpu_vtime.c b/tools/testing/selftests/sched_ext/select_cpu_vtime.c
new file mode 100644
index 000000000000..1e9b5c9bfff1
--- /dev/null
+++ b/tools/testing/selftests/sched_ext/select_cpu_vtime.c
@@ -0,0 +1,62 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (c) 2024 Meta Platforms, Inc. and affiliates.
+ * Copyright (c) 2024 David Vernet <dvernet@meta.com>
+ * Copyright (c) 2024 Tejun Heo <tj@kernel.org>
+ */
+#include <bpf/bpf.h>
+#include <scx/common.h>
+#include <sys/wait.h>
+#include <unistd.h>
+#include "select_cpu_vtime.bpf.skel.h"
+#include "scx_test.h"
+
+static enum scx_test_status setup(void **ctx)
+{
+	struct select_cpu_vtime *skel;
+
+	skel = select_cpu_vtime__open();
+	SCX_FAIL_IF(!skel, "Failed to open");
+	SCX_ENUM_INIT(skel);
+	SCX_FAIL_IF(select_cpu_vtime__load(skel), "Failed to load skel");
+
+	*ctx = skel;
+
+	return SCX_TEST_PASS;
+}
+
+static enum scx_test_status run(void *ctx)
+{
+	struct select_cpu_vtime *skel = ctx;
+	struct bpf_link *link;
+
+	SCX_ASSERT(!skel->bss->consumed);
+
+	link = bpf_map__attach_struct_ops(skel->maps.select_cpu_vtime_ops);
+	SCX_FAIL_IF(!link, "Failed to attach scheduler");
+
+	sleep(1);
+
+	SCX_ASSERT(skel->bss->consumed);
+
+	bpf_link__destroy(link);
+
+	return SCX_TEST_PASS;
+}
+
+static void cleanup(void *ctx)
+{
+	struct select_cpu_vtime *skel = ctx;
+
+	select_cpu_vtime__destroy(skel);
+}
+
+struct scx_test select_cpu_vtime = {
+	.name = "select_cpu_vtime",
+	.description = "Test doing direct vtime-dispatching from "
+		       "ops.select_cpu(), to a non-built-in DSQ",
+	.setup = setup,
+	.run = run,
+	.cleanup = cleanup,
+};
+REGISTER_SCX_TEST(&select_cpu_vtime)