// SPDX-License-Identifier: GPL-2.0 // Copyright (c) 2020 Facebook #include <linux/bpf.h> #include <stdint.h> #include <bpf/bpf_helpers.h> #include "bpf_misc.h" char _license[] SEC("license") = "GPL"; struct { __uint(type, BPF_MAP_TYPE_PERF_EVENT_ARRAY); __uint(value_size, sizeof(int)); __uint(key_size, sizeof(int)); } perfbuf SEC(".maps"); const volatile int batch_cnt = 0; long sample_val = 42; long dropped __attribute__((aligned(128))) = 0; SEC("fentry/" SYS_PREFIX "sys_getpgid") int bench_perfbuf(void *ctx) { __u64 *sample; int i; for (i = 0; i < batch_cnt; i++) { if (bpf_perf_event_output(ctx, &perfbuf, BPF_F_CURRENT_CPU, &sample_val, sizeof(sample_val))) __sync_add_and_fetch(&dropped, 1); } return 0; }