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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_dfl_nodispatch.bpf.skel.h"12#include "scx_test.h"13 14#define NUM_CHILDREN 102815 16static enum scx_test_status setup(void **ctx)17{18 struct select_cpu_dfl_nodispatch *skel;19 20 skel = select_cpu_dfl_nodispatch__open_and_load();21 SCX_FAIL_IF(!skel, "Failed to open and load skel");22 *ctx = skel;23 24 return SCX_TEST_PASS;25}26 27static enum scx_test_status run(void *ctx)28{29 struct select_cpu_dfl_nodispatch *skel = ctx;30 struct bpf_link *link;31 pid_t pids[NUM_CHILDREN];32 int i, status;33 34 link = bpf_map__attach_struct_ops(skel->maps.select_cpu_dfl_nodispatch_ops);35 SCX_FAIL_IF(!link, "Failed to attach scheduler");36 37 for (i = 0; i < NUM_CHILDREN; i++) {38 pids[i] = fork();39 if (pids[i] == 0) {40 sleep(1);41 exit(0);42 }43 }44 45 for (i = 0; i < NUM_CHILDREN; i++) {46 SCX_EQ(waitpid(pids[i], &status, 0), pids[i]);47 SCX_EQ(status, 0);48 }49 50 SCX_ASSERT(skel->bss->saw_local);51 52 bpf_link__destroy(link);53 54 return SCX_TEST_PASS;55}56 57static void cleanup(void *ctx)58{59 struct select_cpu_dfl_nodispatch *skel = ctx;60 61 select_cpu_dfl_nodispatch__destroy(skel);62}63 64struct scx_test select_cpu_dfl_nodispatch = {65 .name = "select_cpu_dfl_nodispatch",66 .description = "Verify behavior of scx_bpf_select_cpu_dfl() in "67 "ops.select_cpu()",68 .setup = setup,69 .run = run,70 .cleanup = cleanup,71};72REGISTER_SCX_TEST(&select_cpu_dfl_nodispatch)73