8 #define PAGE_SIZE sysconf(_SC_PAGE_SIZE)
11 #define MAP_ANONYMOUS 0
14 /* max mmap size, *start is the largest power-of-2 size considered */
15 static size_t mmax(int fd, size_t *start)
20 for (i=n=*start; i>=PAGE_SIZE; i/=2) {
21 if ((p=mmap(0, n, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS, fd, 0)) == MAP_FAILED) {
30 return n & -PAGE_SIZE;
34 fills the virtual memory with anonymous PROT_NONE mmaps,
35 returns the mappings in *p and *n in decreasing size order,
36 the return value is the number of mappings or -1 on failure.
38 int t_vmfill(void **p, size_t *n, int len)
40 int fd = MAP_ANONYMOUS ? -1 : open("/dev/zero", O_RDWR);
41 size_t start = SIZE_MAX/2 + 1;
50 q = mmap(0, m, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS, fd, 0);