1// SPDX-License-Identifier: GPL-2.0
2// Copyright (c) 2020 Facebook
3
4#include <linux/bpf.h>
5#include <stdint.h>
6#include <bpf/bpf_helpers.h>
7
8char _license[] SEC("license") = "GPL";
9
10struct {
11	__uint(type, BPF_MAP_TYPE_PERF_EVENT_ARRAY);
12	__uint(value_size, sizeof(int));
13	__uint(key_size, sizeof(int));
14} perfbuf SEC(".maps");
15
16const volatile int batch_cnt = 0;
17
18long sample_val = 42;
19long dropped __attribute__((aligned(128))) = 0;
20
21SEC("fentry/__x64_sys_getpgid")
22int bench_perfbuf(void *ctx)
23{
24	__u64 *sample;
25	int i;
26
27	for (i = 0; i < batch_cnt; i++) {
28		if (bpf_perf_event_output(ctx, &perfbuf, BPF_F_CURRENT_CPU,
29					  &sample_val, sizeof(sample_val)))
30			__sync_add_and_fetch(&dropped, 1);
31	}
32	return 0;
33}
34