// 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; }