1 // SPDX-License-Identifier: GPL-2.0 2 /* Copyright (c) 2022 Bytedance */ 3 4 #include "vmlinux.h" 5 #include <bpf/bpf_helpers.h> 6 #include "bpf_misc.h" 7 8 char _license[] SEC("license") = "GPL"; 9 10 #define MAX_ENTRIES 1000 11 12 struct { 13 __uint(type, BPF_MAP_TYPE_HASH); 14 __type(key, u32); 15 __type(value, u64); 16 __uint(max_entries, MAX_ENTRIES); 17 } hash_map_bench SEC(".maps"); 18 19 u64 __attribute__((__aligned__(256))) percpu_time[256]; 20 u64 nr_loops; 21 22 static int loop_update_callback(__u32 index, u32 *key) 23 { 24 u64 init_val = 1; 25 26 bpf_map_update_elem(&hash_map_bench, key, &init_val, BPF_ANY); 27 return 0; 28 } 29 30 SEC("fentry/" SYS_PREFIX "sys_getpgid") 31 int benchmark(void *ctx) 32 { 33 u32 cpu = bpf_get_smp_processor_id(); 34 u32 key = cpu + MAX_ENTRIES; 35 u64 start_time = bpf_ktime_get_ns(); 36 37 bpf_loop(nr_loops, loop_update_callback, &key, 0); 38 percpu_time[cpu & 255] = bpf_ktime_get_ns() - start_time; 39 return 0; 40 } 41