vm-data2.c

#include <stdio.h>
#include <stdlib.h>

#define PAGE_SIZE       (4096)
#define PAGES           (2048)  /* 8 MB worth of data : won't all fit */
#define SIZE            (PAGE_SIZE * PAGES / sizeof(int))
#define NUM_REFS        (2)
#define PAGES_TO_TOUCH  (1536) /* Touching 6 MB of data */

/* Create a very large array */
unsigned int array[SIZE];

int
main()
{
        unsigned int i = 0;
        unsigned int index = 0;
        unsigned int refs = 0;

        for (refs = 0; refs < NUM_REFS; refs++) {
                for (i=0; i<PAGES_TO_TOUCH; i++) {
                        index = i * PAGE_SIZE  / sizeof(int);
                        array[index] = i;
                }
        }

        for (i=0; i<PAGES_TO_TOUCH; i++) {
                index = i * PAGE_SIZE  / sizeof(int);
                if (array[index] != i) {
                        printf("FAILED array[%d] = %u != %d\n", i, array[index], i);
                        exit(1);
                }
        }

        printf("SUCCEEDED\n");
        exit(0);
}