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#include "bpf_misc.h"
 8
 9char _license[] SEC("license") = "GPL";
10
11struct {
12	__uint(type, BPF_MAP_TYPE_RINGBUF);
13} ringbuf SEC(".maps");
14
15const volatile int batch_cnt = 0;
16const volatile long use_output = 0;
17
18long sample_val = 42;
19long dropped __attribute__((aligned(128))) = 0;
20
21const volatile long wakeup_data_size = 0;
22
23static __always_inline long get_flags()
24{
25	long sz;
26
27	if (!wakeup_data_size)
28		return 0;
29
30	sz = bpf_ringbuf_query(&ringbuf, BPF_RB_AVAIL_DATA);
31	return sz >= wakeup_data_size ? BPF_RB_FORCE_WAKEUP : BPF_RB_NO_WAKEUP;
32}
33
34SEC("fentry/" SYS_PREFIX "sys_getpgid")
35int bench_ringbuf(void *ctx)
36{
37	long *sample, flags;
38	int i;
39
40	if (!use_output) {
41		for (i = 0; i < batch_cnt; i++) {
42			sample = bpf_ringbuf_reserve(&ringbuf,
43					             sizeof(sample_val), 0);
44			if (!sample) {
45				__sync_add_and_fetch(&dropped, 1);
46			} else {
47				*sample = sample_val;
48				flags = get_flags();
49				bpf_ringbuf_submit(sample, flags);
50			}
51		}
52	} else {
53		for (i = 0; i < batch_cnt; i++) {
54			flags = get_flags();
55			if (bpf_ringbuf_output(&ringbuf, &sample_val,
56					       sizeof(sample_val), flags))
57				__sync_add_and_fetch(&dropped, 1);
58		}
59	}
60	return 0;
61}

 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_RINGBUF);
12} ringbuf SEC(".maps");
13
14const volatile int batch_cnt = 0;
15const volatile long use_output = 0;
16
17long sample_val = 42;
18long dropped __attribute__((aligned(128))) = 0;
19
20const volatile long wakeup_data_size = 0;
21
22static __always_inline long get_flags()
23{
24	long sz;
25
26	if (!wakeup_data_size)
27		return 0;
28
29	sz = bpf_ringbuf_query(&ringbuf, BPF_RB_AVAIL_DATA);
30	return sz >= wakeup_data_size ? BPF_RB_FORCE_WAKEUP : BPF_RB_NO_WAKEUP;
31}
32
33SEC("fentry/__x64_sys_getpgid")
34int bench_ringbuf(void *ctx)
35{
36	long *sample, flags;
37	int i;
38
39	if (!use_output) {
40		for (i = 0; i < batch_cnt; i++) {
41			sample = bpf_ringbuf_reserve(&ringbuf,
42					             sizeof(sample_val), 0);
43			if (!sample) {
44				__sync_add_and_fetch(&dropped, 1);
45			} else {
46				*sample = sample_val;
47				flags = get_flags();
48				bpf_ringbuf_submit(sample, flags);
49			}
50		}
51	} else {
52		for (i = 0; i < batch_cnt; i++) {
53			flags = get_flags();
54			if (bpf_ringbuf_output(&ringbuf, &sample_val,
55					       sizeof(sample_val), flags))
56				__sync_add_and_fetch(&dropped, 1);
57		}
58	}
59	return 0;
60}