1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
|
// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright 2014 Sony Mobile Communications Inc.
*
* Selftest for runtime system size
*
* Prints the amount of RAM that the currently running system is using.
*
* This program tries to be as small as possible itself, to
* avoid perturbing the system memory utilization with its
* own execution. It also attempts to have as few dependencies
* on kernel features as possible.
*
* It should be statically linked, with startup libs avoided. It uses
* no library calls except the syscall() function for the following 3
* syscalls:
* sysinfo(), write(), and _exit()
*
* For output, it avoids printf (which in some C libraries
* has large external dependencies) by implementing it's own
* number output and print routines, and using __builtin_strlen()
*
* The test may crash if any of the above syscalls fails because in some
* libc implementations (e.g. the GNU C Library) errno is saved in
* thread-local storage, which does not get initialized due to avoiding
* startup libs.
*/
#include <sys/sysinfo.h>
#include <unistd.h>
#include <sys/syscall.h>
#define STDOUT_FILENO 1
static int print(const char *s)
{
size_t len = 0;
while (s[len] != '\0')
len++;
return syscall(SYS_write, STDOUT_FILENO, s, len);
}
static inline char *num_to_str(unsigned long num, char *buf, int len)
{
unsigned int digit;
/* put digits in buffer from back to front */
buf += len - 1;
*buf = 0;
do {
digit = num % 10;
*(--buf) = digit + '0';
num /= 10;
} while (num > 0);
return buf;
}
static int print_num(unsigned long num)
{
char num_buf[30];
return print(num_to_str(num, num_buf, sizeof(num_buf)));
}
static int print_k_value(const char *s, unsigned long num, unsigned long units)
{
unsigned long long temp;
int ccode;
print(s);
temp = num;
temp = (temp * units)/1024;
num = temp;
ccode = print_num(num);
print("\n");
return ccode;
}
/* this program has no main(), as startup libraries are not used */
void _start(void)
{
int ccode;
struct sysinfo info;
unsigned long used;
static const char *test_name = " get runtime memory use\n";
print("TAP version 13\n");
print("# Testing system size.\n");
ccode = syscall(SYS_sysinfo, &info);
if (ccode < 0) {
print("not ok 1");
print(test_name);
print(" ---\n reason: \"could not get sysinfo\"\n ...\n");
syscall(SYS_exit, ccode);
}
print("ok 1");
print(test_name);
/* ignore cache complexities for now */
used = info.totalram - info.freeram - info.bufferram;
print("# System runtime memory report (units in Kilobytes):\n");
print(" ---\n");
print_k_value(" Total: ", info.totalram, info.mem_unit);
print_k_value(" Free: ", info.freeram, info.mem_unit);
print_k_value(" Buffer: ", info.bufferram, info.mem_unit);
print_k_value(" In use: ", used, info.mem_unit);
print(" ...\n");
print("1..1\n");
syscall(SYS_exit, 0);
}
|
