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