Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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kernel
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linux
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Dhrystone benchmark test module
4 *
5 * Copyright (C) 2022 Glider bv
6 */
7
8#include "dhry.h"
9
10#include <linux/kernel.h>
11#include <linux/module.h>
12#include <linux/moduleparam.h>
13#include <linux/mutex.h>
14#include <linux/smp.h>
15
16#define DHRY_VAX 1757
17
18static int dhry_run_set(const char *val, const struct kernel_param *kp);
19static const struct kernel_param_ops run_ops = {
20 .flags = KERNEL_PARAM_OPS_FL_NOARG,
21 .set = dhry_run_set,
22};
23static bool dhry_run;
24module_param_cb(run, &run_ops, &dhry_run, 0200);
25MODULE_PARM_DESC(run, "Run the test (default: false)");
26
27static int iterations = -1;
28module_param(iterations, int, 0644);
29MODULE_PARM_DESC(iterations,
30 "Number of iterations through the benchmark (default: auto)");
31
32static void dhry_benchmark(void)
33{
34 unsigned int cpu = get_cpu();
35 int i, n;
36
37 if (iterations > 0) {
38 n = dhry(iterations);
39 goto report;
40 }
41
42 for (i = DHRY_VAX; i > 0; i <<= 1) {
43 n = dhry(i);
44 if (n != -EAGAIN)
45 break;
46 }
47
48report:
49 put_cpu();
50 if (n >= 0)
51 pr_info("CPU%u: Dhrystones per Second: %d (%d DMIPS)\n", cpu,
52 n, n / DHRY_VAX);
53 else if (n == -EAGAIN)
54 pr_err("Please increase the number of iterations\n");
55 else
56 pr_err("Dhrystone benchmark failed error %pe\n", ERR_PTR(n));
57}
58
59static int dhry_run_set(const char *val, const struct kernel_param *kp)
60{
61 int ret;
62
63 if (val) {
64 ret = param_set_bool(val, kp);
65 if (ret)
66 return ret;
67 } else {
68 dhry_run = true;
69 }
70
71 if (dhry_run && system_state == SYSTEM_RUNNING)
72 dhry_benchmark();
73
74 return 0;
75}
76
77static int __init dhry_init(void)
78{
79 if (dhry_run)
80 dhry_benchmark();
81
82 return 0;
83}
84module_init(dhry_init);
85
86MODULE_AUTHOR("Geert Uytterhoeven <geert+renesas@glider.be>");
87MODULE_LICENSE("GPL");