1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * Copyright (c) 2023 Meta Platforms, Inc. and affiliates.
4 * Copyright (c) 2023 David Vernet <[email protected]>
5 * Copyright (c) 2023 Tejun Heo <[email protected]>
6 */
7 #include <bpf/bpf.h>
8 #include <scx/common.h>
9 #include <sys/wait.h>
10 #include <unistd.h>
11 #include "select_cpu_dfl_nodispatch.bpf.skel.h"
12 #include "scx_test.h"
13
14 #define NUM_CHILDREN 1028
15
setup(void ** ctx)16 static enum scx_test_status setup(void **ctx)
17 {
18 struct select_cpu_dfl_nodispatch *skel;
19
20 skel = select_cpu_dfl_nodispatch__open();
21 SCX_FAIL_IF(!skel, "Failed to open");
22 SCX_ENUM_INIT(skel);
23 SCX_FAIL_IF(select_cpu_dfl_nodispatch__load(skel), "Failed to load skel");
24
25 *ctx = skel;
26
27 return SCX_TEST_PASS;
28 }
29
run(void * ctx)30 static enum scx_test_status run(void *ctx)
31 {
32 struct select_cpu_dfl_nodispatch *skel = ctx;
33 struct bpf_link *link;
34 pid_t pids[NUM_CHILDREN];
35 int i, status;
36
37 link = bpf_map__attach_struct_ops(skel->maps.select_cpu_dfl_nodispatch_ops);
38 SCX_FAIL_IF(!link, "Failed to attach scheduler");
39
40 for (i = 0; i < NUM_CHILDREN; i++) {
41 pids[i] = fork();
42 if (pids[i] == 0) {
43 sleep(1);
44 exit(0);
45 }
46 }
47
48 for (i = 0; i < NUM_CHILDREN; i++) {
49 SCX_EQ(waitpid(pids[i], &status, 0), pids[i]);
50 SCX_EQ(status, 0);
51 }
52
53 SCX_ASSERT(skel->bss->saw_local);
54
55 bpf_link__destroy(link);
56
57 return SCX_TEST_PASS;
58 }
59
cleanup(void * ctx)60 static void cleanup(void *ctx)
61 {
62 struct select_cpu_dfl_nodispatch *skel = ctx;
63
64 select_cpu_dfl_nodispatch__destroy(skel);
65 }
66
67 struct scx_test select_cpu_dfl_nodispatch = {
68 .name = "select_cpu_dfl_nodispatch",
69 .description = "Verify behavior of scx_bpf_select_cpu_dfl() in "
70 "ops.select_cpu()",
71 .setup = setup,
72 .run = run,
73 .cleanup = cleanup,
74 };
75 REGISTER_SCX_TEST(&select_cpu_dfl_nodispatch)
76