Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * Copyright (c) 2023 Meta Platforms, Inc. and affiliates.
4 * Copyright (c) 2023 David Vernet <dvernet@meta.com>
5 * Copyright (c) 2023 Tejun Heo <tj@kernel.org>
6 */
7#include <bpf/bpf.h>
8#include <scx/common.h>
9#include <sys/wait.h>
10#include <unistd.h>
11#include "select_cpu_dispatch.bpf.skel.h"
12#include "scx_test.h"
13
14#define NUM_CHILDREN 1028
15
16static enum scx_test_status setup(void **ctx)
17{
18 struct select_cpu_dispatch *skel;
19
20 skel = select_cpu_dispatch__open();
21 SCX_FAIL_IF(!skel, "Failed to open");
22 SCX_ENUM_INIT(skel);
23 SCX_FAIL_IF(select_cpu_dispatch__load(skel), "Failed to load skel");
24
25 *ctx = skel;
26
27 return SCX_TEST_PASS;
28}
29
30static enum scx_test_status run(void *ctx)
31{
32 struct select_cpu_dispatch *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_dispatch_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 bpf_link__destroy(link);
54
55 return SCX_TEST_PASS;
56}
57
58static void cleanup(void *ctx)
59{
60 struct select_cpu_dispatch *skel = ctx;
61
62 select_cpu_dispatch__destroy(skel);
63}
64
65struct scx_test select_cpu_dispatch = {
66 .name = "select_cpu_dispatch",
67 .description = "Test direct dispatching to built-in DSQs from "
68 "ops.select_cpu()",
69 .setup = setup,
70 .run = run,
71 .cleanup = cleanup,
72};
73REGISTER_SCX_TEST(&select_cpu_dispatch)