162306a36Sopenharmony_ci// SPDX-License-Identifier: GPL-2.0 262306a36Sopenharmony_ci// Copyright (c) 2020 Facebook 362306a36Sopenharmony_ci 462306a36Sopenharmony_ci#include <linux/bpf.h> 562306a36Sopenharmony_ci#include <stdint.h> 662306a36Sopenharmony_ci#include <bpf/bpf_helpers.h> 762306a36Sopenharmony_ci#include "bpf_misc.h" 862306a36Sopenharmony_ci 962306a36Sopenharmony_cichar _license[] SEC("license") = "GPL"; 1062306a36Sopenharmony_ci 1162306a36Sopenharmony_cistruct { 1262306a36Sopenharmony_ci __uint(type, BPF_MAP_TYPE_PERF_EVENT_ARRAY); 1362306a36Sopenharmony_ci __uint(value_size, sizeof(int)); 1462306a36Sopenharmony_ci __uint(key_size, sizeof(int)); 1562306a36Sopenharmony_ci} perfbuf SEC(".maps"); 1662306a36Sopenharmony_ci 1762306a36Sopenharmony_ciconst volatile int batch_cnt = 0; 1862306a36Sopenharmony_ci 1962306a36Sopenharmony_cilong sample_val = 42; 2062306a36Sopenharmony_cilong dropped __attribute__((aligned(128))) = 0; 2162306a36Sopenharmony_ci 2262306a36Sopenharmony_ciSEC("fentry/" SYS_PREFIX "sys_getpgid") 2362306a36Sopenharmony_ciint bench_perfbuf(void *ctx) 2462306a36Sopenharmony_ci{ 2562306a36Sopenharmony_ci int i; 2662306a36Sopenharmony_ci 2762306a36Sopenharmony_ci for (i = 0; i < batch_cnt; i++) { 2862306a36Sopenharmony_ci if (bpf_perf_event_output(ctx, &perfbuf, BPF_F_CURRENT_CPU, 2962306a36Sopenharmony_ci &sample_val, sizeof(sample_val))) 3062306a36Sopenharmony_ci __sync_add_and_fetch(&dropped, 1); 3162306a36Sopenharmony_ci } 3262306a36Sopenharmony_ci return 0; 3362306a36Sopenharmony_ci} 34