18c2ecf20Sopenharmony_ci// SPDX-License-Identifier: GPL-2.0 28c2ecf20Sopenharmony_ci// Copyright (c) 2020 Facebook 38c2ecf20Sopenharmony_ci 48c2ecf20Sopenharmony_ci#include <linux/bpf.h> 58c2ecf20Sopenharmony_ci#include <stdint.h> 68c2ecf20Sopenharmony_ci#include <bpf/bpf_helpers.h> 78c2ecf20Sopenharmony_ci 88c2ecf20Sopenharmony_cichar _license[] SEC("license") = "GPL"; 98c2ecf20Sopenharmony_ci 108c2ecf20Sopenharmony_cistruct { 118c2ecf20Sopenharmony_ci __uint(type, BPF_MAP_TYPE_PERF_EVENT_ARRAY); 128c2ecf20Sopenharmony_ci __uint(value_size, sizeof(int)); 138c2ecf20Sopenharmony_ci __uint(key_size, sizeof(int)); 148c2ecf20Sopenharmony_ci} perfbuf SEC(".maps"); 158c2ecf20Sopenharmony_ci 168c2ecf20Sopenharmony_ciconst volatile int batch_cnt = 0; 178c2ecf20Sopenharmony_ci 188c2ecf20Sopenharmony_cilong sample_val = 42; 198c2ecf20Sopenharmony_cilong dropped __attribute__((aligned(128))) = 0; 208c2ecf20Sopenharmony_ci 218c2ecf20Sopenharmony_ciSEC("fentry/__x64_sys_getpgid") 228c2ecf20Sopenharmony_ciint bench_perfbuf(void *ctx) 238c2ecf20Sopenharmony_ci{ 248c2ecf20Sopenharmony_ci __u64 *sample; 258c2ecf20Sopenharmony_ci int i; 268c2ecf20Sopenharmony_ci 278c2ecf20Sopenharmony_ci for (i = 0; i < batch_cnt; i++) { 288c2ecf20Sopenharmony_ci if (bpf_perf_event_output(ctx, &perfbuf, BPF_F_CURRENT_CPU, 298c2ecf20Sopenharmony_ci &sample_val, sizeof(sample_val))) 308c2ecf20Sopenharmony_ci __sync_add_and_fetch(&dropped, 1); 318c2ecf20Sopenharmony_ci } 328c2ecf20Sopenharmony_ci return 0; 338c2ecf20Sopenharmony_ci} 34