On Wed, Nov 26, 2014 at 08:27:23PM -0800, Tim Bird wrote:
> --- /dev/null
> +++ b/tools/testing/selftests/size/Makefile
[...]
> +LIBGCC=$(shell $(CC) -print-libgcc-file-name)
> +
> +get_size: get_size.c
> + $(CC) --static -ffreestanding -nostartfiles \
> + -Wl,--entry=_start get_size.c $(LIBGCC) \
> + -o get_size
You don't need -Wl,--entry=_start; that's the default.
You shouldn't need to manually find libgcc, either; the compiler should
do that for you. What goes wrong if you don't include that? If you're
trying to link libgcc statically, try -static-libgcc.
Also, static is normally spelled -static, not --static.
> --- /dev/null
> +++ b/tools/testing/selftests/size/get_size.c
[...]
> +int print(const char *s)
This function, and all the others apart from _start, should be declared
static.
> +void num_to_str(unsigned long num, char *s)
Likewise, static.
> +{
> + unsigned long long temp, div;
> + int started;
> +
> + temp = num;
> + div = 1000000000000000000LL;
> + started = 0;
> + while (div) {
> + if (temp/div || started) {
> + *s++ = (unsigned char)(temp/div + '0');
> + started = 1;
> + }
> + temp -= (temp/div)*div;
> + div /= 10;
> + }
> + *s = 0;
> +}
You'd probably end up with significantly smaller code (and no divisions,
and thus no corner cases on architectures that need a special function
to do unsigned long long division) if you print in hex. You could also
drop the "no leading zeros" logic, and just *always* print a 64-bit
value as 16 hex digits.
> +int print_num(unsigned long num)
Likewise, static.
> +{
> + char num_buf[30];
> +
> + num_to_str(num, num_buf);
> + return print(num_buf);
> +}
> +
> +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;
> +}
I'd suggest dropping this entirely, and just always printing the exact
values returned by sysinfo. Drop the multiply, too, and just print
info.mem_unit as well. It's easy to post-process the value in a more
capable environment.
> +/* 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 size runtime size\n");
Shouldn't the "not ok" here and the "ok" below have the same test
description?
> + 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);
> +}
> --
> 1.8.2.2
>
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