Ajay Mohan / Rasperf

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Commit 8314bd572f9abd9faef2574cd00bc17c1d5c401c

Authored by Aravind Kumar
1 parent e17bc6f3be
Exists in master

pfpault

Showing 2 changed files with 3 additions and 3 deletions Inline Diff

memory/pagefault.c View file @ 8314bd5
#include <stdio.h> 1 1 #include <stdio.h>
#include <stdlib.h> 2 2 #include <stdlib.h>
#include <errno.h> 3 3 #include <errno.h>
#include <unistd.h> 4 4 #include <unistd.h>
#include <stdlib.h> 5 5 #include <stdlib.h>
#include <sys/mman.h> 6 6 #include <sys/mman.h>
#include <sys/stat.h> 7 7 #include <sys/stat.h>
#include <fcntl.h> 8 8 #include <fcntl.h>
9 9
#define KB 1024 10 10 #define KB 1024
#define MB 1024 * KB 11 11 #define MB 1024 * KB
#define GB 1024 * MB 12 12 #define GB 1024 * MB
#define SIZE_OF_MEMORY 839*MB // Main memory size 13 13 #define SIZE_OF_MEMORY 839*MB // Main memory size
#define CPU_FREQ 900000.0 14 14 #define CPU_FREQ 900000.0
#define ITERATIONS 1024.0*1024.0 15 15 #define ITERATIONS 1024.0*1024.0
#define handle_error(msg) do { perror(msg); exit(EXIT_FAILURE); } while (0) 16 16 #define handle_error(msg) do { perror(msg); exit(EXIT_FAILURE); } while (0)
17 17
18 18
int main(int argc, char *argv[]){ 19 19 int main(int argc, char *argv[]){
20 20
int fd1, fd2; 21 21 int fd1, fd2;
char *addr1, *addr2; 22 22 char *addr1, *addr2;
register volatile int c=0; 23 23 register volatile int c=0;
int i, j; 24 24 int i, j;
unsigned s_t, e_t, t=0; 25 25 unsigned s_t, e_t, t=0;
26 26
if (argc != 3){ 27 27 if (argc != 3){
printf("usage: a.out <file1> <file2> \n"); 28 28 printf("usage: a.out <file1> <file2> \n");
exit(EXIT_FAILURE); 29 29 exit(EXIT_FAILURE);
} 30 30 }
31 31
if ((fd1 = open(argv[1], O_RDONLY)) == -1){ 32 32 if ((fd1 = open(argv[1], O_RDONLY)) == -1){
//handle_error("open"); 33 33 //handle_error("open");
printf("exit fd1\n"); 34 34 printf("exit fd1\n");
exit(0); 35 35 exit(0);
} 36 36 }
37 37
if ((fd2 = open(argv[2], O_RDONLY)) == -1){ 38 38 if ((fd2 = open(argv[2], O_RDONLY)) == -1){
//handle_error("open"); 39 39 //handle_error("open");
printf("exit fd2\n"); 40 40 printf("exit fd2\n");
exit(0); 41 41 exit(0);
} 42 42 }
43 43
posix_fadvise(fd1, 0, 0, POSIX_FADV_RANDOM); 44 44 posix_fadvise(fd1, 0, 0, POSIX_FADV_RANDOM);
posix_fadvise(fd2, 0, 0, POSIX_FADV_RANDOM); 45 45 posix_fadvise(fd2, 0, 0, POSIX_FADV_RANDOM);
46 46
addr1 = (char *) mmap(0, SIZE_OF_MEMORY, PROT_READ, MAP_PRIVATE | MAP_POPULATE, fd1, 0); 47 47 addr1 = (char *) mmap(0, SIZE_OF_MEMORY, PROT_READ, MAP_PRIVATE | MAP_POPULATE, fd1, 0);
if (addr1 == MAP_FAILED){ 48 48 if (addr1 == MAP_FAILED){
printf("mmap1 %d %s", errno, strerror(errno)); 49 49 printf("mmap1 %d %s", errno, strerror(errno));
exit(0); 50 50 exit(0);
} 51 51 }
addr2 = (char *) mmap(0, SIZE_OF_MEMORY, PROT_READ, MAP_PRIVATE | MAP_POPULATE, fd2, 0); 52 52 addr2 = (char *) mmap(0, SIZE_OF_MEMORY, PROT_READ, MAP_PRIVATE | MAP_POPULATE, fd2, 0);
if (addr2 == MAP_FAILED){ 53 53 if (addr2 == MAP_FAILED){
printf("mmap2 %d %s", errno, strerror(errno)); 54 54 printf("mmap2 %d %s", errno, strerror(errno));
exit(0); 55 55 exit(0);
} 56 56 }
57 57
madvise(addr1, 0, MADV_RANDOM); 58 58 madvise(addr1, 0, MADV_RANDOM);
madvise(addr2, 0, MADV_RANDOM); 59 59 madvise(addr2, 0, MADV_RANDOM);
asm volatile("mrc p15, 0, %0, c9, c14, 0" : "=r" (i)); 60 60 asm volatile("mrc p15, 0, %0, c9, c14, 0" : "=r" (i));
printf("User enable regr: %x\n", i); 61 61 printf("User enable regr: %x\n", i);
62 62
j = 32; 63 63 j = 32;
for(i = 0; i < 100; i=i++){ 64 64 for(i = 0; i < 60000; i=i+10){
asm volatile("mrc p15, 0, %0, c9, c13, 0" : "=r" (s_t)); 65 65 asm volatile("mrc p15, 0, %0, c9, c13, 0" : "=r" (s_t));
c+= (addr1[i + j*4*KB]); // read at multiple of page size, so every read causes a page fault 66 66 c+= (addr1[i*4*KB]); // read at multiple of page size, so every read causes a page fault
j = j*2; 67 67 // j = j*2;
//c = c+1; 68 68 //c = c+1;
asm volatile("mrc p15, 0, %0, c9, c13, 0" : "=r" (e_t)); 69 69 asm volatile("mrc p15, 0, %0, c9, c13, 0" : "=r" (e_t));
t += (e_t - s_t); 70 70 t += (e_t - s_t);
memory/pagefault.o View file @ 8314bd5

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