DEVRES_ALLOC(9) Driver Basics DEVRES_ALLOC(9)NAME
devres_alloc - Allocate device resource data
SYNOPSIS
void * devres_alloc(dr_release_t release, size_t size, gfp_t gfp);
ARGUMENTS
release
Release function devres will be associated with
size
Allocation size
gfp
Allocation flags
DESCRIPTION
Allocate devres of size bytes. The allocated area is zeroed, then associated with release. The returned pointer can be passed to other
devres_*() functions.
RETURNS
Pointer to allocated devres on success, NULL on failure.
COPYRIGHT Kernel Hackers Manual 2.6. July 2010 DEVRES_ALLOC(9)
Check Out this Related Man Page
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)
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