#include <tools.h>
#include <unistd.h>
#include <stdlib.h>
#include <fcntl.h>
#include <sys/mman.h>
#include <sys/sysctl.h>

char *file = "/larder/file/file0";
int fd;
int size = 1*G;
char *ptr = 0;

int foo(void)
{
	static int old = -1;
	int pos; char tmp;
	long long before, after;
	volatile char x __attribute__ ((unused));

	do {
		pos = random() % size;
		if (mincore(&ptr[pos], 1, &tmp)) pdie("mincore");
	} while (tmp);

	before = rdtsc(); x = ptr[pos]; after = rdtsc();

	char str[1024]; size_t len;

#define SYSCTL(foo) \
		unsigned int foo; \
		str[0] = 0; len = sizeof(str); \
		if (sysctlbyname("debug." ## #foo, str, &len, NULL, 0)) \
			pdie("sysctl"); \
		foo = *(int*)str;

	SYSCTL(secsprcyl);
	SYSCTL(blkno);
	SYSCTL(cylinder);
	SYSCTL(head);
	SYSCTL(sector);
	SYSCTL(lba);

	if (old >= 0) printf("%g  \t%g    \tblk %d cyl %d head %d sec %d\n", (pos - old) / (1.0*M), (after - before)/1000.0,
			     blkno, cylinder, head, sector);
	old = pos;
	return pos;
}

int main(int argc, char *argv[])
{
	int i;

	fd = open(file, O_RDONLY);
	unless (fd >= 0) die("open");
	ptr = (char *) mmap(0, size, PROT_READ, MAP_PRIVATE, fd, 0);
	unless (ptr) die("mmap");
	srandom(time(0)+getpid());

	for (i = 0; i < 10000; i++)
		foo();
	return 0;
}