Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / tools / testing / selftests / size / get_size.c

diff --git a/kernel/tools/testing/selftests/size/get_size.c b/kernel/tools/testing/selftests/size/get_size.c
new file mode 100644 (file)
index 0000000..2d1af7c
--- /dev/null
+++ b/kernel/tools/testing/selftests/size/get_size.c
@@ -0,0 +1,100 @@
+/*
+ * 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);
+}