void sigaction_sigbusy(int signum, siginfo_t *info, void *ctxt)
{
char *ptr;
int ret;
char x;
long len;
if (signum != SIGBUS)
return;
ptr = info->si_addr;
mnovolatile(ptr, CHUNK, &ret);
printf("Fixing up data\n");
len = (ptr - vaddr)/CHUNK;
x = 'A' + len;
memset(ptr, x, CHUNK);
printf("%c\n", x);
}
int main(int argc, char *argv[])
{
int i, purged;
char* file = NULL;
int fd;
int pressure = 0;
int opt;
/* Process arguments */
while ((opt = getopt(argc, argv, "p:f:"))!=-1) {
switch(opt) {
case 'p':
pressure = atoi(optarg);
break;
case 'f':
file = optarg;
break;
default:
printf("Usage: %s [-p <mempressure in megs>] [-f <filename>]\n", argv[0]);
printf(" -p: Amount of memory pressure to generate\n");
printf(" -f: Use a file\n");
exit(-1);
}
}
if (file) {
printf("Using file %s\n", file);
fd = open(file, O_RDWR);
vaddr = mmap(0, FULLSIZE, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
} else {
vaddr = malloc(FULLSIZE);
}
purged = 0;
vaddr += PAGE_SIZE-1;
vaddr -= (long)vaddr % PAGE_SIZE;
for(i=0; i < CHUNKNUM; i++)
memset(vaddr + (i*CHUNK), 'A'+i, CHUNK);
for(i=0; i < CHUNKNUM; ) {
mvolatile(vaddr + (i*CHUNK), CHUNK);
i+=2;
}
printf("Generating %i megs of pressure\n", pressure);
generate_pressure(pressure);
for(i=0; i < CHUNKNUM; ) {
mnovolatile(vaddr + (i*CHUNK), CHUNK, &purged);
i+=2;
}
if (purged)
printf("Data purged!\n");
for(i=0; i < CHUNKNUM; i++)
printf("%c\n", vaddr[i*CHUNK]);
return 0;
}
