7 #define PAGE_SIZE sysconf(_SC_PAGE_SIZE)
10 /* max mmap size, *start is the largest power-of-2 size considered */
11 static size_t mmax(int fd, size_t *start)
16 for (i=n=*start; i>=PAGE_SIZE; i/=2) {
17 if ((p=mmap(0, n, PROT_NONE, MAP_PRIVATE, fd, 0)) == MAP_FAILED) {
26 return n & -PAGE_SIZE;
30 fills the virtual memory with anonymous PROT_NONE mmaps,
31 returns the mappings in *p and *n in decreasing size order,
32 the return value is the number of mappings or -1 on failure.
34 int t_vmfill(void **p, size_t *n, int len)
36 int fd = open("/dev/zero", O_RDWR);
37 size_t start = SIZE_MAX/2 + 1;
46 q = mmap(0, m, PROT_NONE, MAP_PRIVATE, fd, 0);