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1/* SPDX-License-Identifier: GPL-2.0 */2/*3 * Copyright (c) 2024 Meta Platforms, Inc. and affiliates.4 * Copyright (c) 2024 David Vernet <dvernet@meta.com>5 */6#include <bpf/bpf.h>7#include <pthread.h>8#include <scx/common.h>9#include <sys/wait.h>10#include <unistd.h>11#include "maximal.bpf.skel.h"12#include "scx_test.h"13 14static struct maximal *skel;15static pthread_t threads[2];16 17bool force_exit = false;18 19static enum scx_test_status setup(void **ctx)20{21 skel = maximal__open_and_load();22 if (!skel) {23 SCX_ERR("Failed to open and load skel");24 return SCX_TEST_FAIL;25 }26 27 return SCX_TEST_PASS;28}29 30static void *do_reload_loop(void *arg)31{32 u32 i;33 34 for (i = 0; i < 1024 && !force_exit; i++) {35 struct bpf_link *link;36 37 link = bpf_map__attach_struct_ops(skel->maps.maximal_ops);38 if (link)39 bpf_link__destroy(link);40 }41 42 return NULL;43}44 45static enum scx_test_status run(void *ctx)46{47 int err;48 void *ret;49 50 err = pthread_create(&threads[0], NULL, do_reload_loop, NULL);51 SCX_FAIL_IF(err, "Failed to create thread 0");52 53 err = pthread_create(&threads[1], NULL, do_reload_loop, NULL);54 SCX_FAIL_IF(err, "Failed to create thread 1");55 56 SCX_FAIL_IF(pthread_join(threads[0], &ret), "thread 0 failed");57 SCX_FAIL_IF(pthread_join(threads[1], &ret), "thread 1 failed");58 59 return SCX_TEST_PASS;60}61 62static void cleanup(void *ctx)63{64 force_exit = true;65 maximal__destroy(skel);66}67 68struct scx_test reload_loop = {69 .name = "reload_loop",70 .description = "Stress test loading and unloading schedulers repeatedly in a tight loop",71 .setup = setup,72 .run = run,73 .cleanup = cleanup,74};75REGISTER_SCX_TEST(&reload_loop)76