64 lines
1.5 KiB
C
64 lines
1.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Copyright (c) 2023 Isovalent */
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#include "vmlinux.h"
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#include <bpf/bpf_helpers.h>
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#include "bpf_misc.h"
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char _license[] SEC("license") = "GPL";
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struct {
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__uint(type, BPF_MAP_TYPE_HASH);
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} hash_map_bench SEC(".maps");
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/* The number of slots to store times */
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#define NR_SLOTS 32
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#define NR_CPUS 256
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#define CPU_MASK (NR_CPUS-1)
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/* Configured by userspace */
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u64 nr_entries;
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u64 nr_loops;
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u32 __attribute__((__aligned__(8))) key[NR_CPUS];
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/* Filled by us */
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u64 __attribute__((__aligned__(256))) percpu_times_index[NR_CPUS];
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u64 __attribute__((__aligned__(256))) percpu_times[NR_CPUS][NR_SLOTS];
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static inline void patch_key(u32 i)
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{
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#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
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key[0] = i + 1;
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#else
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key[0] = __builtin_bswap32(i + 1);
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#endif
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/* the rest of key is random and is configured by userspace */
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}
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static int lookup_callback(__u32 index, u32 *unused)
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{
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patch_key(index);
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return bpf_map_lookup_elem(&hash_map_bench, key) ? 0 : 1;
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}
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static int loop_lookup_callback(__u32 index, u32 *unused)
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{
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return bpf_loop(nr_entries, lookup_callback, NULL, 0) ? 0 : 1;
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}
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SEC("fentry/" SYS_PREFIX "sys_getpgid")
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int benchmark(void *ctx)
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{
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u32 cpu = bpf_get_smp_processor_id();
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u32 times_index;
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u64 start_time;
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times_index = percpu_times_index[cpu & CPU_MASK] % NR_SLOTS;
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start_time = bpf_ktime_get_ns();
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bpf_loop(nr_loops, loop_lookup_callback, NULL, 0);
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percpu_times[cpu & CPU_MASK][times_index] = bpf_ktime_get_ns() - start_time;
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percpu_times_index[cpu & CPU_MASK] += 1;
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return 0;
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}
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