1 // SPDX-License-Identifier: GPL-2.0
2 // Copyright (c) 2020 Facebook
6 #include <bpf/bpf_helpers.h>
8 char _license[] SEC("license") = "GPL";
11 __uint(type, BPF_MAP_TYPE_RINGBUF);
12 } ringbuf SEC(".maps");
14 const volatile int batch_cnt = 0;
15 const volatile long use_output = 0;
18 long dropped __attribute__((aligned(128))) = 0;
20 const volatile long wakeup_data_size = 0;
22 static __always_inline long get_flags()
26 if (!wakeup_data_size)
29 sz = bpf_ringbuf_query(&ringbuf, BPF_RB_AVAIL_DATA);
30 return sz >= wakeup_data_size ? BPF_RB_FORCE_WAKEUP : BPF_RB_NO_WAKEUP;
33 SEC("fentry/__x64_sys_getpgid")
34 int bench_ringbuf(void *ctx)
40 for (i = 0; i < batch_cnt; i++) {
41 sample = bpf_ringbuf_reserve(&ringbuf,
42 sizeof(sample_val), 0);
44 __sync_add_and_fetch(&dropped, 1);
48 bpf_ringbuf_submit(sample, flags);
52 for (i = 0; i < batch_cnt; i++) {
54 if (bpf_ringbuf_output(&ringbuf, &sample_val,
55 sizeof(sample_val), flags))
56 __sync_add_and_fetch(&dropped, 1);