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 16 static 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 30 static 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 58 static void cleanup(void *ctx) 59 { 60 struct select_cpu_dispatch *skel = ctx; 61 62 select_cpu_dispatch__destroy(skel); 63 } 64 65 struct 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 }; 73 REGISTER_SCX_TEST(&select_cpu_dispatch) 74