| // 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; |
| } |
