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
14 static struct maximal *skel;
15 static pthread_t threads[2];
16
17 bool force_exit = false;
18
19 static 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
30 static 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
45 static 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
62 static void cleanup(void *ctx)
63 {
64 force_exit = true;
65 maximal__destroy(skel);
66 }
67
68 struct 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 };
75 REGISTER_SCX_TEST(&reload_loop)
76
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