centos man page for free_huge_pages

Query: free_huge_pages

OS: centos

Section: 3

Format: Original Unix Latex Style Formatted with HTML and a Horizontal Scroll Bar

GET_HUGE_PAGES(3)					     Library Functions Manual						 GET_HUGE_PAGES(3)

NAME
get_huge_pages, free_huge_pages - Allocate and free hugepages
SYNOPSIS
#include <hugetlbfs.h> void *get_huge_pages(size_t len, ghp_t flags); void free_huge_pages(void *ptr);
DESCRIPTION
get_huge_pages() allocates a memory region len bytes in size backed by hugepages. Hugepages may be of benefit to applications that use large amounts of address space and suffer a performance hit due to TLB misses. Wall-clock time or oprofile can be used to determine if there is a performance benefit from using hugepages or not. The len parameter must be hugepage-aligned. In the current implementation, only the default hugepage size may be allocated via this func- tion. Use gethugepagesize to discover what the alignment should be. The flags argument changes the behaviour of the function. Flags may be or'd together. GHP_DEFAULT Allocate a region of memory of the requested length backed by hugepages of the default hugepage size. Return NULL if sufficient pages are not available free_huge_pages() frees a region of memory allocated by get_huge_pages(). The behaviour of the function if another pointer is used, valid or otherwise, is undefined.
RETURN VALUE
On success, a pointer is returned to the allocated memory. On error, NULL is returned. errno will be set based on what the failure of mmap() was due to.
SEE ALSO
oprofile(1) , gethugepagesize(3) , get_hugepage_region(3) , libhugetlbfs(7)
AUTHORS
libhugetlbfs was written by various people on the libhugetlbfs-devel mailing list. October 8, 2008 GET_HUGE_PAGES(3)
Related Man Pages
hugectl(8) - centos
free_hugepage_region(3) - centos
gethugepagesizes(3) - centos
hugetlbfs_find_path_for_size(3) - centos
hugetlbfs_unlinked_fd(3) - centos
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