1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
|
// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2022 Bytedance */
#include "vmlinux.h"
#include <bpf/bpf_helpers.h>
#include "bpf_misc.h"
char _license[] SEC("license") = "GPL";
#define MAX_ENTRIES 1000
struct {
__uint(type, BPF_MAP_TYPE_HASH);
__type(key, u32);
__type(value, u64);
__uint(max_entries, MAX_ENTRIES);
} hash_map_bench SEC(".maps");
u64 __attribute__((__aligned__(256))) percpu_time[256];
u64 nr_loops;
static int loop_update_callback(__u32 index, u32 *key)
{
u64 init_val = 1;
bpf_map_update_elem(&hash_map_bench, key, &init_val, BPF_ANY);
return 0;
}
SEC("fentry/" SYS_PREFIX "sys_getpgid")
int benchmark(void *ctx)
{
u32 cpu = bpf_get_smp_processor_id();
u32 key = cpu + MAX_ENTRIES;
u64 start_time = bpf_ktime_get_ns();
bpf_loop(nr_loops, loop_update_callback, &key, 0);
percpu_time[cpu & 255] = bpf_ktime_get_ns() - start_time;
return 0;
}
|
