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| 1 | +#define _GNU_SOURCE |
| 2 | +#include <assert.h> |
| 3 | +#include <fcntl.h> |
| 4 | +#include <stdio.h> |
| 5 | +#include <stdlib.h> |
| 6 | +#include <string.h> |
| 7 | +#include <sys/mman.h> |
| 8 | +#include <sys/stat.h> |
| 9 | +#include <sys/types.h> |
| 10 | +#include <unistd.h> |
| 11 | + |
| 12 | +typedef unsigned long long u64; |
| 13 | + |
| 14 | +static size_t length = 1 << 24; |
| 15 | + |
| 16 | +static u64 read_rss(void) |
| 17 | +{ |
| 18 | + char buf[4096], *s = buf; |
| 19 | + int i, fd; |
| 20 | + u64 rss; |
| 21 | + |
| 22 | + fd = open("/proc/self/statm", O_RDONLY); |
| 23 | + assert(fd > 2); |
| 24 | + memset(buf, 0, sizeof(buf)); |
| 25 | + read(fd, buf, sizeof(buf) - 1); |
| 26 | + for (i = 0; i < 1; i++) |
| 27 | + s = strchr(s, ' ') + 1; |
| 28 | + rss = strtoull(s, NULL, 10); |
| 29 | + return rss << 12; /* assumes 4k pagesize */ |
| 30 | +} |
| 31 | + |
| 32 | +static void do_mmap(int fd, int extra_flags, int unmap) |
| 33 | +{ |
| 34 | + int *p; |
| 35 | + int flags = MAP_PRIVATE | MAP_POPULATE | extra_flags; |
| 36 | + u64 before, after; |
| 37 | + |
| 38 | + before = read_rss(); |
| 39 | + p = mmap(NULL, length, PROT_READ | PROT_WRITE, flags, fd, 0); |
| 40 | + assert(p != MAP_FAILED || |
| 41 | + !"mmap returned an unexpected error"); |
| 42 | + after = read_rss(); |
| 43 | + assert(llabs(after - before - length) < 0x40000 || |
| 44 | + !"rss didn't grow as expected"); |
| 45 | + if (!unmap) |
| 46 | + return; |
| 47 | + munmap(p, length); |
| 48 | + after = read_rss(); |
| 49 | + assert(llabs(after - before) < 0x40000 || |
| 50 | + !"rss didn't shrink as expected"); |
| 51 | +} |
| 52 | + |
| 53 | +static int open_file(const char *path) |
| 54 | +{ |
| 55 | + int fd, err; |
| 56 | + |
| 57 | + unlink(path); |
| 58 | + fd = open(path, O_CREAT | O_RDWR | O_TRUNC | O_EXCL |
| 59 | + | O_LARGEFILE | O_CLOEXEC, 0600); |
| 60 | + assert(fd > 2); |
| 61 | + unlink(path); |
| 62 | + err = ftruncate(fd, length); |
| 63 | + assert(!err); |
| 64 | + return fd; |
| 65 | +} |
| 66 | + |
| 67 | +int main(void) |
| 68 | +{ |
| 69 | + int hugefd, fd; |
| 70 | + |
| 71 | + fd = open_file("/dev/shm/hugetlbhog"); |
| 72 | + hugefd = open_file("/hugepages/hugetlbhog"); |
| 73 | + |
| 74 | + system("echo 100 > /proc/sys/vm/nr_hugepages"); |
| 75 | + do_mmap(-1, MAP_ANONYMOUS, 1); |
| 76 | + do_mmap(fd, 0, 1); |
| 77 | + do_mmap(-1, MAP_ANONYMOUS | MAP_HUGETLB, 1); |
| 78 | + do_mmap(hugefd, 0, 1); |
| 79 | + do_mmap(hugefd, MAP_HUGETLB, 1); |
| 80 | + /* Leak the last one to test do_exit() */ |
| 81 | + do_mmap(-1, MAP_ANONYMOUS | MAP_HUGETLB, 0); |
| 82 | + printf("oll korrekt.\n"); |
| 83 | + return 0; |
| 84 | +} |
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