1// SPDX-License-Identifier: GPL-2.0
2/* Copyright (c) 2022 Bytedance */
3
4#include "bench.h"
5#include "bpf_hashmap_full_update_bench.skel.h"
6#include "bpf_util.h"
7
8/* BPF triggering benchmarks */
9static struct ctx {
10 struct bpf_hashmap_full_update_bench *skel;
11} ctx;
12
13#define MAX_LOOP_NUM 10000
14
15static void validate(void)
16{
17 if (env.consumer_cnt != 0) {
18 fprintf(stderr, "benchmark doesn't support consumer!\n");
19 exit(1);
20 }
21}
22
23static void *producer(void *input)
24{
25 while (true) {
26 /* trigger the bpf program */
27 syscall(__NR_getpgid);
28 }
29
30 return NULL;
31}
32
33static void measure(struct bench_res *res)
34{
35}
36
37static void setup(void)
38{
39 struct bpf_link *link;
40 int map_fd, i, max_entries;
41
42 setup_libbpf();
43
44 ctx.skel = bpf_hashmap_full_update_bench__open_and_load();
45 if (!ctx.skel) {
46 fprintf(stderr, "failed to open skeleton\n");
47 exit(1);
48 }
49
50 ctx.skel->bss->nr_loops = MAX_LOOP_NUM;
51
52 link = bpf_program__attach(ctx.skel->progs.benchmark);
53 if (!link) {
54 fprintf(stderr, "failed to attach program!\n");
55 exit(1);
56 }
57
58 /* fill hash_map */
59 map_fd = bpf_map__fd(ctx.skel->maps.hash_map_bench);
60 max_entries = bpf_map__max_entries(ctx.skel->maps.hash_map_bench);
61 for (i = 0; i < max_entries; i++)
62 bpf_map_update_elem(map_fd, &i, &i, BPF_ANY);
63}
64
65static void hashmap_report_final(struct bench_res res[], int res_cnt)
66{
67 unsigned int nr_cpus = bpf_num_possible_cpus();
68 int i;
69
70 for (i = 0; i < nr_cpus; i++) {
71 u64 time = ctx.skel->bss->percpu_time[i];
72
73 if (!time)
74 continue;
75
76 printf("%d:hash_map_full_perf %lld events per sec\n",
77 i, ctx.skel->bss->nr_loops * 1000000000ll / time);
78 }
79}
80
81const struct bench bench_bpf_hashmap_full_update = {
82 .name = "bpf-hashmap-full-update",
83 .validate = validate,
84 .setup = setup,
85 .producer_thread = producer,
86 .measure = measure,
87 .report_progress = NULL,
88 .report_final = hashmap_report_final,
89};
90

source code of linux/tools/testing/selftests/bpf/benchs/bench_bpf_hashmap_full_update.c