1/* SPDX-License-Identifier: GPL-2.0 */
 2/*
 3 * Copyright (c) 2024 Meta Platforms, Inc. and affiliates.
 4 * Copyright (c) 2024 David Vernet <dvernet@meta.com>
 5 */
 6#include <bpf/bpf.h>
 7#include <pthread.h>
 8#include <scx/common.h>
 9#include <sys/wait.h>
10#include <unistd.h>
11#include "maximal.bpf.skel.h"
12#include "scx_test.h"
13
14static struct maximal *skel;
15static pthread_t threads[2];
16
17bool force_exit = false;
18
19static enum scx_test_status setup(void **ctx)
20{
21	skel = maximal__open_and_load();
22	if (!skel) {
23		SCX_ERR("Failed to open and load skel");
24		return SCX_TEST_FAIL;
25	}
26
27	return SCX_TEST_PASS;
28}
29
30static void *do_reload_loop(void *arg)
31{
32	u32 i;
33
34	for (i = 0; i < 1024 && !force_exit; i++) {
35		struct bpf_link *link;
36
37		link = bpf_map__attach_struct_ops(skel->maps.maximal_ops);
38		if (link)
39			bpf_link__destroy(link);
40	}
41
42	return NULL;
43}
44
45static enum scx_test_status run(void *ctx)
46{
47	int err;
48	void *ret;
49
50	err = pthread_create(&threads[0], NULL, do_reload_loop, NULL);
51	SCX_FAIL_IF(err, "Failed to create thread 0");
52
53	err = pthread_create(&threads[1], NULL, do_reload_loop, NULL);
54	SCX_FAIL_IF(err, "Failed to create thread 1");
55
56	SCX_FAIL_IF(pthread_join(threads[0], &ret), "thread 0 failed");
57	SCX_FAIL_IF(pthread_join(threads[1], &ret), "thread 1 failed");
58
59	return SCX_TEST_PASS;
60}
61
62static void cleanup(void *ctx)
63{
64	force_exit = true;
65	maximal__destroy(skel);
66}
67
68struct scx_test reload_loop = {
69	.name = "reload_loop",
70	.description = "Stress test loading and unloading schedulers repeatedly in a tight loop",
71	.setup = setup,
72	.run = run,
73	.cleanup = cleanup,
74};
75REGISTER_SCX_TEST(&reload_loop)