/**
* get_hugepage_region - Allocate an amount of memory backed by huge pages
*
* len: Size of the region to allocate
* flags: Flags specifying the behaviour of the function
*
* This function allocates a region of memory backed by huge pages. Care should
* be taken when using this function as a drop-in replacement for malloc() as
* memory can be wasted if the length is not hugepage-aligned. This function
* is more relaxed than get_huge_pages() in that it allows fallback to small
* pages when requested.
*/
void *get_hugepage_region(size_t len, ghr_t flags)
{
size_t aligned_len, wastage;
void *buf;
/* Catch an altogether-too easy typo */
if (flags & GHP_MASK)
ERROR("Improper use of GHP_* in get_hugepage_region()\n");
/* Align the len parameter to a hugepage boundary and allocate */
aligned_len = ALIGN(len, gethugepagesize());
buf = get_huge_pages(aligned_len, GHP_DEFAULT);
if (buf == NULL && (flags & GHR_FALLBACK)) {
aligned_len = ALIGN(len, getpagesize());
buf = fallback_base_pages(len, flags);
}
/* Calculate wastage for coloring */
wastage = aligned_len - len;
if (wastage != 0 && !(flags & GHR_COLOR))
DEBUG("get_hugepage_region: Wasted %zd bytes due to alignment\n",
wastage);
/* Only colour if requested */
if (flags & GHR_COLOR)
buf = cachecolor(buf, len, wastage);
return buf;
}
void* chpl_comm_ofi_hp_get_huge_pages(size_t size) {
return get_huge_pages(size, GHP_DEFAULT);
}