xref: /OK3568_Linux_fs/kernel/tools/testing/selftests/bpf/progs/perfbuf_bench.c (revision 4882a59341e53eb6f0b4789bf948001014eff981) 
1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0
2*4882a593Smuzhiyun // Copyright (c) 2020 Facebook
3*4882a593Smuzhiyun 
4*4882a593Smuzhiyun #include <linux/bpf.h>
5*4882a593Smuzhiyun #include <stdint.h>
6*4882a593Smuzhiyun #include <bpf/bpf_helpers.h>
7*4882a593Smuzhiyun 
8*4882a593Smuzhiyun char _license[] SEC("license") = "GPL";
9*4882a593Smuzhiyun 
10*4882a593Smuzhiyun struct {
11*4882a593Smuzhiyun 	__uint(type, BPF_MAP_TYPE_PERF_EVENT_ARRAY);
12*4882a593Smuzhiyun 	__uint(value_size, sizeof(int));
13*4882a593Smuzhiyun 	__uint(key_size, sizeof(int));
14*4882a593Smuzhiyun } perfbuf SEC(".maps");
15*4882a593Smuzhiyun 
16*4882a593Smuzhiyun const volatile int batch_cnt = 0;
17*4882a593Smuzhiyun 
18*4882a593Smuzhiyun long sample_val = 42;
19*4882a593Smuzhiyun long dropped __attribute__((aligned(128))) = 0;
20*4882a593Smuzhiyun 
21*4882a593Smuzhiyun SEC("fentry/__x64_sys_getpgid")
bench_perfbuf(void * ctx)22*4882a593Smuzhiyun int bench_perfbuf(void *ctx)
23*4882a593Smuzhiyun {
24*4882a593Smuzhiyun 	__u64 *sample;
25*4882a593Smuzhiyun 	int i;
26*4882a593Smuzhiyun 
27*4882a593Smuzhiyun 	for (i = 0; i < batch_cnt; i++) {
28*4882a593Smuzhiyun 		if (bpf_perf_event_output(ctx, &perfbuf, BPF_F_CURRENT_CPU,
29*4882a593Smuzhiyun 					  &sample_val, sizeof(sample_val)))
30*4882a593Smuzhiyun 			__sync_add_and_fetch(&dropped, 1);
31*4882a593Smuzhiyun 	}
32*4882a593Smuzhiyun 	return 0;
33*4882a593Smuzhiyun }
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