62 lines
1.3 KiB
C
62 lines
1.3 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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// Copyright (c) 2020 Facebook
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#include <linux/bpf.h>
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#include <stdint.h>
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#include <bpf/bpf_helpers.h>
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#include "bpf_misc.h"
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char _license[] SEC("license") = "GPL";
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struct {
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__uint(type, BPF_MAP_TYPE_RINGBUF);
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} ringbuf SEC(".maps");
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const volatile int batch_cnt = 0;
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const volatile long use_output = 0;
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long sample_val = 42;
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long dropped __attribute__((aligned(128))) = 0;
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const volatile long wakeup_data_size = 0;
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static __always_inline long get_flags()
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{
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long sz;
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if (!wakeup_data_size)
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return 0;
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sz = bpf_ringbuf_query(&ringbuf, BPF_RB_AVAIL_DATA);
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return sz >= wakeup_data_size ? BPF_RB_FORCE_WAKEUP : BPF_RB_NO_WAKEUP;
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}
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SEC("fentry/" SYS_PREFIX "sys_getpgid")
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int bench_ringbuf(void *ctx)
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{
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long *sample, flags;
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int i;
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if (!use_output) {
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for (i = 0; i < batch_cnt; i++) {
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sample = bpf_ringbuf_reserve(&ringbuf,
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sizeof(sample_val), 0);
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if (!sample) {
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__sync_add_and_fetch(&dropped, 1);
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} else {
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*sample = sample_val;
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flags = get_flags();
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bpf_ringbuf_submit(sample, flags);
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}
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}
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} else {
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for (i = 0; i < batch_cnt; i++) {
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flags = get_flags();
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if (bpf_ringbuf_output(&ringbuf, &sample_val,
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sizeof(sample_val), flags))
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__sync_add_and_fetch(&dropped, 1);
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}
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}
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return 0;
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}
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