// SPDX-License-Identifier: GPL-2.0
|
#include <test_progs.h>
|
|
void test_stacktrace_map(void)
|
{
|
int control_map_fd, stackid_hmap_fd, stackmap_fd, stack_amap_fd;
|
const char *prog_name = "tracepoint/sched/sched_switch";
|
int err, prog_fd, stack_trace_len;
|
const char *file = "./test_stacktrace_map.o";
|
__u32 key, val, duration = 0;
|
struct bpf_program *prog;
|
struct bpf_object *obj;
|
struct bpf_link *link;
|
|
err = bpf_prog_load(file, BPF_PROG_TYPE_TRACEPOINT, &obj, &prog_fd);
|
if (CHECK(err, "prog_load", "err %d errno %d\n", err, errno))
|
return;
|
|
prog = bpf_object__find_program_by_title(obj, prog_name);
|
if (CHECK(!prog, "find_prog", "prog '%s' not found\n", prog_name))
|
goto close_prog;
|
|
link = bpf_program__attach_tracepoint(prog, "sched", "sched_switch");
|
if (CHECK(IS_ERR(link), "attach_tp", "err %ld\n", PTR_ERR(link)))
|
goto close_prog;
|
|
/* find map fds */
|
control_map_fd = bpf_find_map(__func__, obj, "control_map");
|
if (CHECK_FAIL(control_map_fd < 0))
|
goto disable_pmu;
|
|
stackid_hmap_fd = bpf_find_map(__func__, obj, "stackid_hmap");
|
if (CHECK_FAIL(stackid_hmap_fd < 0))
|
goto disable_pmu;
|
|
stackmap_fd = bpf_find_map(__func__, obj, "stackmap");
|
if (CHECK_FAIL(stackmap_fd < 0))
|
goto disable_pmu;
|
|
stack_amap_fd = bpf_find_map(__func__, obj, "stack_amap");
|
if (CHECK_FAIL(stack_amap_fd < 0))
|
goto disable_pmu;
|
|
/* give some time for bpf program run */
|
sleep(1);
|
|
/* disable stack trace collection */
|
key = 0;
|
val = 1;
|
bpf_map_update_elem(control_map_fd, &key, &val, 0);
|
|
/* for every element in stackid_hmap, we can find a corresponding one
|
* in stackmap, and vise versa.
|
*/
|
err = compare_map_keys(stackid_hmap_fd, stackmap_fd);
|
if (CHECK(err, "compare_map_keys stackid_hmap vs. stackmap",
|
"err %d errno %d\n", err, errno))
|
goto disable_pmu;
|
|
err = compare_map_keys(stackmap_fd, stackid_hmap_fd);
|
if (CHECK(err, "compare_map_keys stackmap vs. stackid_hmap",
|
"err %d errno %d\n", err, errno))
|
goto disable_pmu;
|
|
stack_trace_len = PERF_MAX_STACK_DEPTH * sizeof(__u64);
|
err = compare_stack_ips(stackmap_fd, stack_amap_fd, stack_trace_len);
|
if (CHECK(err, "compare_stack_ips stackmap vs. stack_amap",
|
"err %d errno %d\n", err, errno))
|
goto disable_pmu;
|
|
disable_pmu:
|
bpf_link__destroy(link);
|
close_prog:
|
bpf_object__close(obj);
|
}
|
