stacktrace_map.c (2255B)
1// SPDX-License-Identifier: GPL-2.0 2#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.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 one 53 * 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}