CentOS 7.0 - man page for gethugepagesizes (centos section 3)
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gethugepagesizes - Get the system supported huge page sizes
int gethugepagesizes(long pagesizes, int n_elem);
The gethugepagesizes() function returns either the number of system supported huge page
sizes or the sizes themselves. If pagesizes is NULL and n_elem is 0, then the number of
huge pages the system supports is returned. Otherwise, pagesizes is filled with at most
n_elem page sizes.
On success, either the number of huge page sizes supported by the system or the number of
huge page sizes stored in pagesizes is returned. On failure, -1 is returned and errno is
EINVAL n_elem is less than zero or n_elem is greater than zero and pagesizes is NULL.
Also see opendir(3) for other possible values for errno. This error occurs when the sysfs
directory exists but cannot be opened.
This call will return all huge page sizes as reported by the kernel. Not all of these
sizes may be usable by the programmer since mount points may not be available for all
sizes. To test whether a size will be usable by libhugetlbfs,
hugetlbfs_find_path_for_size() can be called on a specific size to see if a mount point is
oprofile(1), opendir(3), hugetlbfs_find_path_for_size(3), libhugetlbfs(7)
libhugetlbfs was written by various people on the libhugetlbfs-devel mailing list.
October 10, 2008 GETHUGEPAGESIZES(3)
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