/* SPDX-License-Identifier: GPL-2.0 */ /* * Copyright (c) 2023 Meta Platforms, Inc. and affiliates. * Copyright (c) 2023 David Vernet <dvernet@meta.com> * Copyright (c) 2023 Tejun Heo <tj@kernel.org> */ #include <bpf/bpf.h> #include <scx/common.h> #include <sys/wait.h> #include <unistd.h> #include "select_cpu_dispatch.bpf.skel.h" #include "scx_test.h" #define NUM_CHILDREN 1028 static enum scx_test_status setup(void **ctx) { struct select_cpu_dispatch *skel; skel = select_cpu_dispatch__open_and_load(); SCX_FAIL_IF(!skel, "Failed to open and load skel"); *ctx = skel; return SCX_TEST_PASS; } static enum scx_test_status run(void *ctx) { struct select_cpu_dispatch *skel = ctx; struct bpf_link *link; pid_t pids[NUM_CHILDREN]; int i, status; link = bpf_map__attach_struct_ops(skel->maps.select_cpu_dispatch_ops); SCX_FAIL_IF(!link, "Failed to attach scheduler"); for (i = 0; i < NUM_CHILDREN; i++) { pids[i] = fork(); if (pids[i] == 0) { sleep(1); exit(0); } } for (i = 0; i < NUM_CHILDREN; i++) { SCX_EQ(waitpid(pids[i], &status, 0), pids[i]); SCX_EQ(status, 0); } bpf_link__destroy(link); return SCX_TEST_PASS; } static void cleanup(void *ctx) { struct select_cpu_dispatch *skel = ctx; select_cpu_dispatch__destroy(skel); } struct scx_test select_cpu_dispatch = { .name = "select_cpu_dispatch", .description = "Test direct dispatching to built-in DSQs from " "ops.select_cpu()", .setup = setup, .run = run, .cleanup = cleanup, }; REGISTER_SCX_TEST(&select_cpu_dispatch)