76 lines · c
1// SPDX-License-Identifier: GPL-2.02#include <test_progs.h>3 4void test_stacktrace_map(void)5{6 int control_map_fd, stackid_hmap_fd, stackmap_fd, stack_amap_fd;7 const char *prog_name = "oncpu";8 int err, prog_fd, stack_trace_len;9 const char *file = "./test_stacktrace_map.bpf.o";10 __u32 key, val, duration = 0;11 struct bpf_program *prog;12 struct bpf_object *obj;13 struct bpf_link *link;14 15 err = bpf_prog_test_load(file, BPF_PROG_TYPE_TRACEPOINT, &obj, &prog_fd);16 if (CHECK(err, "prog_load", "err %d errno %d\n", err, errno))17 return;18 19 prog = bpf_object__find_program_by_name(obj, prog_name);20 if (CHECK(!prog, "find_prog", "prog '%s' not found\n", prog_name))21 goto close_prog;22 23 link = bpf_program__attach_tracepoint(prog, "sched", "sched_switch");24 if (!ASSERT_OK_PTR(link, "attach_tp"))25 goto close_prog;26 27 /* find map fds */28 control_map_fd = bpf_find_map(__func__, obj, "control_map");29 if (CHECK_FAIL(control_map_fd < 0))30 goto disable_pmu;31 32 stackid_hmap_fd = bpf_find_map(__func__, obj, "stackid_hmap");33 if (CHECK_FAIL(stackid_hmap_fd < 0))34 goto disable_pmu;35 36 stackmap_fd = bpf_find_map(__func__, obj, "stackmap");37 if (CHECK_FAIL(stackmap_fd < 0))38 goto disable_pmu;39 40 stack_amap_fd = bpf_find_map(__func__, obj, "stack_amap");41 if (CHECK_FAIL(stack_amap_fd < 0))42 goto disable_pmu;43 44 /* give some time for bpf program run */45 sleep(1);46 47 /* disable stack trace collection */48 key = 0;49 val = 1;50 bpf_map_update_elem(control_map_fd, &key, &val, 0);51 52 /* for every element in stackid_hmap, we can find a corresponding one53 * in stackmap, and vise versa.54 */55 err = compare_map_keys(stackid_hmap_fd, stackmap_fd);56 if (CHECK(err, "compare_map_keys stackid_hmap vs. stackmap",57 "err %d errno %d\n", err, errno))58 goto disable_pmu;59 60 err = compare_map_keys(stackmap_fd, stackid_hmap_fd);61 if (CHECK(err, "compare_map_keys stackmap vs. stackid_hmap",62 "err %d errno %d\n", err, errno))63 goto disable_pmu;64 65 stack_trace_len = PERF_MAX_STACK_DEPTH * sizeof(__u64);66 err = compare_stack_ips(stackmap_fd, stack_amap_fd, stack_trace_len);67 if (CHECK(err, "compare_stack_ips stackmap vs. stack_amap",68 "err %d errno %d\n", err, errno))69 goto disable_pmu;70 71disable_pmu:72 bpf_link__destroy(link);73close_prog:74 bpf_object__close(obj);75}76