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libbpf.h
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lwt_len_hist_kern.c
lwt_len_hist_user.c
map_perf_test_kern.c
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offwaketime_kern.c
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tcp_rwnd_kern.c
tcp_synrto_kern.c
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test_map_in_map_kern.c
test_map_in_map_user.c
test_overhead_kprobe_kern.c
test_overhead_raw_tp_kern.c
test_overhead_tp_kern.c
test_overhead_user.c
test_override_return.sh
test_probe_write_user_kern.c
test_probe_write_user_user.c
trace_event_kern.c
trace_event_user.c
trace_output_kern.c
trace_output_user.c
tracex1_kern.c
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tracex2_kern.c
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xdp_tx_iptunnel_common.h
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/* This program is free software; you can redistribute it and/or * modify it under the terms of version 2 of the GNU General Public * License as published by the Free Software Foundation. */ #include <stdio.h> #include <unistd.h> #include <stdlib.h> #include <stdbool.h> #include <string.h> #include <fcntl.h> #include <poll.h> #include <linux/perf_event.h> #include <linux/bpf.h> #include <errno.h> #include <assert.h> #include <sys/syscall.h> #include <sys/ioctl.h> #include <sys/mman.h> #include <time.h> #include <signal.h> #include "libbpf.h" #include "bpf_load.h" #include "perf-sys.h" #include "trace_helpers.h" static int pmu_fd; static __u64 time_get_ns(void) { struct timespec ts; clock_gettime(CLOCK_MONOTONIC, &ts); return ts.tv_sec * 1000000000ull + ts.tv_nsec; } static __u64 start_time; #define MAX_CNT 100000ll static int print_bpf_output(void *data, int size) { static __u64 cnt; struct { __u64 pid; __u64 cookie; } *e = data; if (e->cookie != 0x12345678) { printf("BUG pid %llx cookie %llx sized %d\n", e->pid, e->cookie, size); return LIBBPF_PERF_EVENT_ERROR; } cnt++; if (cnt == MAX_CNT) { printf("recv %lld events per sec\n", MAX_CNT * 1000000000ll / (time_get_ns() - start_time)); return LIBBPF_PERF_EVENT_DONE; } return LIBBPF_PERF_EVENT_CONT; } static void test_bpf_perf_event(void) { struct perf_event_attr attr = { .sample_type = PERF_SAMPLE_RAW, .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_BPF_OUTPUT, }; int key = 0; pmu_fd = sys_perf_event_open(&attr, -1/*pid*/, 0/*cpu*/, -1/*group_fd*/, 0); assert(pmu_fd >= 0); assert(bpf_map_update_elem(map_fd[0], &key, &pmu_fd, BPF_ANY) == 0); ioctl(pmu_fd, PERF_EVENT_IOC_ENABLE, 0); } int main(int argc, char **argv) { char filename[256]; FILE *f; int ret; snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]); if (load_bpf_file(filename)) { printf("%s", bpf_log_buf); return 1; } test_bpf_perf_event(); if (perf_event_mmap(pmu_fd) < 0) return 1; f = popen("taskset 1 dd if=/dev/zero of=/dev/null", "r"); (void) f; start_time = time_get_ns(); ret = perf_event_poller(pmu_fd, print_bpf_output); kill(0, SIGINT); return ret; }
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