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Linux/tools/testing/selftests/size/get_size.c

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  1 // SPDX-License-Identifier: GPL-2.0-only
  2 /*
  3  * Copyright 2014 Sony Mobile Communications Inc.
  4  *
  5  * Selftest for runtime system size
  6  *
  7  * Prints the amount of RAM that the currently running system is using.
  8  *
  9  * This program tries to be as small as possible itself, to
 10  * avoid perturbing the system memory utilization with its
 11  * own execution.  It also attempts to have as few dependencies
 12  * on kernel features as possible.
 13  *
 14  * It should be statically linked, with startup libs avoided.  It uses
 15  * no library calls except the syscall() function for the following 3
 16  * syscalls:
 17  *   sysinfo(), write(), and _exit()
 18  *
 19  * For output, it avoids printf (which in some C libraries
 20  * has large external dependencies) by  implementing it's own
 21  * number output and print routines, and using __builtin_strlen()
 22  *
 23  * The test may crash if any of the above syscalls fails because in some
 24  * libc implementations (e.g. the GNU C Library) errno is saved in
 25  * thread-local storage, which does not get initialized due to avoiding
 26  * startup libs.
 27  */
 28 
 29 #include <sys/sysinfo.h>
 30 #include <unistd.h>
 31 #include <sys/syscall.h>
 32 
 33 #define STDOUT_FILENO 1
 34 
 35 static int print(const char *s)
 36 {
 37         size_t len = 0;
 38 
 39         while (s[len] != '\0')
 40                 len++;
 41 
 42         return syscall(SYS_write, STDOUT_FILENO, s, len);
 43 }
 44 
 45 static inline char *num_to_str(unsigned long num, char *buf, int len)
 46 {
 47         unsigned int digit;
 48 
 49         /* put digits in buffer from back to front */
 50         buf += len - 1;
 51         *buf = 0;
 52         do {
 53                 digit = num % 10;
 54                 *(--buf) = digit + '';
 55                 num /= 10;
 56         } while (num > 0);
 57 
 58         return buf;
 59 }
 60 
 61 static int print_num(unsigned long num)
 62 {
 63         char num_buf[30];
 64 
 65         return print(num_to_str(num, num_buf, sizeof(num_buf)));
 66 }
 67 
 68 static int print_k_value(const char *s, unsigned long num, unsigned long units)
 69 {
 70         unsigned long long temp;
 71         int ccode;
 72 
 73         print(s);
 74 
 75         temp = num;
 76         temp = (temp * units)/1024;
 77         num = temp;
 78         ccode = print_num(num);
 79         print("\n");
 80         return ccode;
 81 }
 82 
 83 /* this program has no main(), as startup libraries are not used */
 84 void _start(void)
 85 {
 86         int ccode;
 87         struct sysinfo info;
 88         unsigned long used;
 89         static const char *test_name = " get runtime memory use\n";
 90 
 91         print("TAP version 13\n");
 92         print("# Testing system size.\n");
 93 
 94         ccode = syscall(SYS_sysinfo, &info);
 95         if (ccode < 0) {
 96                 print("not ok 1");
 97                 print(test_name);
 98                 print(" ---\n reason: \"could not get sysinfo\"\n ...\n");
 99                 syscall(SYS_exit, ccode);
100         }
101         print("ok 1");
102         print(test_name);
103 
104         /* ignore cache complexities for now */
105         used = info.totalram - info.freeram - info.bufferram;
106         print("# System runtime memory report (units in Kilobytes):\n");
107         print(" ---\n");
108         print_k_value(" Total:  ", info.totalram, info.mem_unit);
109         print_k_value(" Free:   ", info.freeram, info.mem_unit);
110         print_k_value(" Buffer: ", info.bufferram, info.mem_unit);
111         print_k_value(" In use: ", used, info.mem_unit);
112         print(" ...\n");
113         print("1..1\n");
114 
115         syscall(SYS_exit, 0);
116 }
117 

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