07-03-2010
Another added benefit from dropping SimpleCDN... overall performance has improved.
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LEARN ABOUT CENTOS
free_hugepage_region
GET_HUGEPAGE_REGION(3) Library Functions Manual GET_HUGEPAGE_REGION(3)
NAME
get_hugepage_region, free_hugepage_region - Allocate and free regions of memory that use hugepages where possible
SYNOPSIS
#include <hugetlbfs.h>
void *get_hugepage_region(size_t len, ghr_t flags);
void free_hugepage_region(void *ptr);
DESCRIPTION
get_hugepage_region() 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.
Unlike get_huge_pages(), len does not have to be hugepage-aligned although memory may be wasted due to alignment. The caller may also spec-
ify that base pages be used in the event there are no hugepages available.
The flags argument changes the behaviour of the function. Flags may be or'd together.
GHR_FALLBACK
Use base pages if there are an insufficient number of huge pages.
GHR_STRICT
Use hugepages or return NULL.
GHR_COLOR
When specified, bytes that would be wasted due to alignment are used to color the buffer by offsetting it by a random cacheline
within the hugepage. This avoids a performance problem whereby multiple buffers use the same cache lines at the same offsets. If it
is not important that the start of the buffer be page-aligned, specify this flag.
GHR_DEFAULT
The library chooses a sensible combination of flags for allocating a region of memory. The current default is: GHR_FALLBACK |
GHR_COLOR
free_hugepage_region() frees a region of memory allocated by get_hugepage_region(). The behaviour of the function if another pointer is
used, valid or otherwise, is undefined.
RETURN VALUE
On success, a pointer is returned for 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_huge_pages(3) , libhugetlbfs(7)
AUTHORS
libhugetlbfs was written by various people on the libhugetlbfs-devel mailing list.
November 7, 2008 GET_HUGEPAGE_REGION(3)