#include <stdlib.h>
#include <unistd.h>
#include <stdio.h>
#include <sys/types.h>
#include <pthread.h>
#include </usr/src/linux/include/linux/memstats.h>

#define PAGESIZE 4096

int main()
{
	int status, i;
	int nr_pages = 100000;
	char **page_array;
	struct memstats stats;

	printf("\n'test.c'\n\n");

	status = syscall (328, &stats);

	printf( "stats:\n" );
	printf(
		"    Number of free pages = %lu\n"
		"    Number of pages used by slab allocator = %lu\n"
		"    Number of pages in active list = %lu\n"
		"    Number of pages in inactive list = %lu\n"
		"    Number of pages in active list with set bit = %lu\n"
		"    Number of pages in inactive list with set bit = %lu\n"
		"    Number of pages moved from active to inactive list = %lu\n"
		"    Number of pages evicted from inactive list = %lu\n",
		stats.u1, stats.u2, stats.u3, stats.u4, stats.u5, stats.u6, stats.u7,
		stats.u8);


	page_array = (char **)malloc(nr_pages * sizeof(char *));

	if ( page_array == NULL )
	{
		printf("ERROR ALLOCATING MEMORY TO FILL PAGES!\n");
		return -1;
	}


	for( i = 0; i < nr_pages; i++)
	{
		page_array[i] = (char *)malloc( sizeof(char) * PAGESIZE );

		if ( page_array[i] == NULL )
		{
			printf("ERROR ALLOCATING MEMORY TO PAGE %d!\n", i);
			return -1;
		}
	}

	printf("\nMemory has been allocated for %d pages\n\n", nr_pages);

	sleep(2);

	status = syscall (328, &stats);

	printf( "stats:\n" );
	printf(
		"    Number of free pages = %lu\n"
		"    Number of pages used by slab allocator = %lu\n"
		"    Number of pages in active list = %lu\n"
		"    Number of pages in inactive list = %lu\n"
		"    Number of pages in active list with set bit = %lu\n"
		"    Number of pages in inactive list with set bit = %lu\n"
		"    Number of pages moved from active to inactive list = %lu\n"
		"    Number of pages evicted from inactive list = %lu\n",
		stats.u1, stats.u2, stats.u3, stats.u4, stats.u5, stats.u6, stats.u7,
		stats.u8);

	printf("\nFreeing allocated memory...\n\n", nr_pages);

	for( i = 0; i < nr_pages; i++)
	{
		free( page_array[i] );
	}

	free( page_array );

	sleep(2);

	printf("Stats after freeing %d pages:\n\n", nr_pages);

	status = syscall (328, &stats);

	printf( "stats:\n" );
	printf(
		"    Number of free pages = %lu\n"
		"    Number of pages used by slab allocator = %lu\n"
		"    Number of pages in active list = %lu\n"
		"    Number of pages in inactive list = %lu\n"
		"    Number of pages in active list with set bit = %lu\n"
		"    Number of pages in inactive list with set bit = %lu\n"
		"    Number of pages moved from active to inactive list = %lu\n"
		"    Number of pages evicted from inactive list = %lu\n",
		stats.u1, stats.u2, stats.u3, stats.u4, stats.u5, stats.u6, stats.u7,
		stats.u8);


	return 0;
}