101 lines
2.4 KiB
C
101 lines
2.4 KiB
C
|
/*
|
||
|
|
* Copyright 2014 Sony Mobile Communications Inc.
|
||
|
|
*
|
||
|
|
* Licensed under the terms of the GNU GPL License version 2
|
||
|
|
*
|
||
|
|
* 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, and only 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()
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <sys/sysinfo.h>
|
||
|
|
#include <unistd.h>
|
||
|
|
|
||
|
|
#define STDOUT_FILENO 1
|
||
|
|
|
||
|
|
static int print(const char *s)
|
||
|
|
{
|
||
|
|
return write(STDOUT_FILENO, s, __builtin_strlen(s));
|
||
|
|
}
|
||
|
|
|
||
|
|
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;
|
||
|
|
|
||
|
|
print("Testing system size.\n");
|
||
|
|
print("1..1\n");
|
||
|
|
|
||
|
|
ccode = sysinfo(&info);
|
||
|
|
if (ccode < 0) {
|
||
|
|
print("not ok 1 get runtime memory use\n");
|
||
|
|
print("# could not get sysinfo\n");
|
||
|
|
_exit(ccode);
|
||
|
|
}
|
||
|
|
/* ignore cache complexities for now */
|
||
|
|
used = info.totalram - info.freeram - info.bufferram;
|
||
|
|
print_k_value("ok 1 get runtime memory use # size = ", used,
|
||
|
|
info.mem_unit);
|
||
|
|
|
||
|
|
print("# System runtime memory report (units in Kilobytes):\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);
|
||
|
|
|
||
|
|
_exit(0);
|
||
|
|
}
|