// SPDX-License-Identifier: GPL-2.0
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// Copyright (c) 2020 Facebook
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#define _GNU_SOURCE
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#include <pthread.h>
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#include <sched.h>
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#include <test_progs.h>
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#include "perf_event_stackmap.skel.h"
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#ifndef noinline
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#define noinline __attribute__((noinline))
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#endif
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noinline int func_1(void)
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{
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static int val = 1;
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val += 1;
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usleep(100);
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return val;
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}
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noinline int func_2(void)
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{
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return func_1();
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}
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noinline int func_3(void)
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{
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return func_2();
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}
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noinline int func_4(void)
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{
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return func_3();
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}
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noinline int func_5(void)
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{
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return func_4();
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}
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noinline int func_6(void)
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{
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int i, val = 1;
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for (i = 0; i < 100; i++)
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val += func_5();
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return val;
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}
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void test_perf_event_stackmap(void)
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{
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struct perf_event_attr attr = {
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/* .type = PERF_TYPE_SOFTWARE, */
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.type = PERF_TYPE_HARDWARE,
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.config = PERF_COUNT_HW_CPU_CYCLES,
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.precise_ip = 2,
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.sample_type = PERF_SAMPLE_IP | PERF_SAMPLE_BRANCH_STACK |
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PERF_SAMPLE_CALLCHAIN,
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.branch_sample_type = PERF_SAMPLE_BRANCH_USER |
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PERF_SAMPLE_BRANCH_NO_FLAGS |
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PERF_SAMPLE_BRANCH_NO_CYCLES |
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PERF_SAMPLE_BRANCH_CALL_STACK,
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.sample_period = 5000,
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.size = sizeof(struct perf_event_attr),
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};
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struct perf_event_stackmap *skel;
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__u32 duration = 0;
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cpu_set_t cpu_set;
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int pmu_fd, err;
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skel = perf_event_stackmap__open();
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if (CHECK(!skel, "skel_open", "skeleton open failed\n"))
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return;
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err = perf_event_stackmap__load(skel);
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if (CHECK(err, "skel_load", "skeleton load failed: %d\n", err))
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goto cleanup;
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CPU_ZERO(&cpu_set);
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CPU_SET(0, &cpu_set);
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err = pthread_setaffinity_np(pthread_self(), sizeof(cpu_set), &cpu_set);
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if (CHECK(err, "set_affinity", "err %d, errno %d\n", err, errno))
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goto cleanup;
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pmu_fd = syscall(__NR_perf_event_open, &attr, -1 /* pid */,
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0 /* cpu 0 */, -1 /* group id */,
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0 /* flags */);
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if (pmu_fd < 0) {
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printf("%s:SKIP:cpu doesn't support the event\n", __func__);
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test__skip();
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goto cleanup;
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}
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skel->links.oncpu = bpf_program__attach_perf_event(skel->progs.oncpu,
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pmu_fd);
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if (CHECK(IS_ERR(skel->links.oncpu), "attach_perf_event",
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"err %ld\n", PTR_ERR(skel->links.oncpu))) {
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close(pmu_fd);
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goto cleanup;
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}
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/* create kernel and user stack traces for testing */
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func_6();
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CHECK(skel->data->stackid_kernel != 2, "get_stackid_kernel", "failed\n");
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CHECK(skel->data->stackid_user != 2, "get_stackid_user", "failed\n");
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CHECK(skel->data->stack_kernel != 2, "get_stack_kernel", "failed\n");
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CHECK(skel->data->stack_user != 2, "get_stack_user", "failed\n");
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cleanup:
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perf_event_stackmap__destroy(skel);
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}
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