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