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