85 lines
1.8 KiB
C
85 lines
1.8 KiB
C
#define _GNU_SOURCE
|
|
#include <assert.h>
|
|
#include <fcntl.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <sys/mman.h>
|
|
#include <sys/stat.h>
|
|
#include <sys/types.h>
|
|
#include <unistd.h>
|
|
|
|
typedef unsigned long long u64;
|
|
|
|
static size_t length = 1 << 24;
|
|
|
|
static u64 read_rss(void)
|
|
{
|
|
char buf[4096], *s = buf;
|
|
int i, fd;
|
|
u64 rss;
|
|
|
|
fd = open("/proc/self/statm", O_RDONLY);
|
|
assert(fd > 2);
|
|
memset(buf, 0, sizeof(buf));
|
|
read(fd, buf, sizeof(buf) - 1);
|
|
for (i = 0; i < 1; i++)
|
|
s = strchr(s, ' ') + 1;
|
|
rss = strtoull(s, NULL, 10);
|
|
return rss << 12; /* assumes 4k pagesize */
|
|
}
|
|
|
|
static void do_mmap(int fd, int extra_flags, int unmap)
|
|
{
|
|
int *p;
|
|
int flags = MAP_PRIVATE | MAP_POPULATE | extra_flags;
|
|
u64 before, after;
|
|
|
|
before = read_rss();
|
|
p = mmap(NULL, length, PROT_READ | PROT_WRITE, flags, fd, 0);
|
|
assert(p != MAP_FAILED ||
|
|
!"mmap returned an unexpected error");
|
|
after = read_rss();
|
|
assert(llabs(after - before - length) < 0x40000 ||
|
|
!"rss didn't grow as expected");
|
|
if (!unmap)
|
|
return;
|
|
munmap(p, length);
|
|
after = read_rss();
|
|
assert(llabs(after - before) < 0x40000 ||
|
|
!"rss didn't shrink as expected");
|
|
}
|
|
|
|
static int open_file(const char *path)
|
|
{
|
|
int fd, err;
|
|
|
|
unlink(path);
|
|
fd = open(path, O_CREAT | O_RDWR | O_TRUNC | O_EXCL
|
|
| O_LARGEFILE | O_CLOEXEC, 0600);
|
|
assert(fd > 2);
|
|
unlink(path);
|
|
err = ftruncate(fd, length);
|
|
assert(!err);
|
|
return fd;
|
|
}
|
|
|
|
int main(void)
|
|
{
|
|
int hugefd, fd;
|
|
|
|
fd = open_file("/dev/shm/hugetlbhog");
|
|
hugefd = open_file("/hugepages/hugetlbhog");
|
|
|
|
system("echo 100 > /proc/sys/vm/nr_hugepages");
|
|
do_mmap(-1, MAP_ANONYMOUS, 1);
|
|
do_mmap(fd, 0, 1);
|
|
do_mmap(-1, MAP_ANONYMOUS | MAP_HUGETLB, 1);
|
|
do_mmap(hugefd, 0, 1);
|
|
do_mmap(hugefd, MAP_HUGETLB, 1);
|
|
/* Leak the last one to test do_exit() */
|
|
do_mmap(-1, MAP_ANONYMOUS | MAP_HUGETLB, 0);
|
|
printf("oll korrekt.\n");
|
|
return 0;
|
|
}
|