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