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mm: add alloc_pages_exact() and free_pages_exact()

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alloc_pages_exact() is similar to alloc_pages(), except that it allocates
the minimum number of pages to fulfill the request.  This is useful if you
want to allocate a very large buffer that is slightly larger than an even
power-of-two number of pages.  In that case, alloc_pages() will waste a
lot of memory.

I have a video driver that wants to allocate a 5MB buffer.  alloc_pages()
wiill waste 3MB of physically-contiguous memory.

Signed-off-by: Timur Tabi <timur@freescale.com>
Cc: Andi Kleen <andi@firstfloor.org>
Acked-by: Mel Gorman <mel@csn.ul.ie>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Timur Tabi 2008-07-23 21:28:11 -07:00 • committed by Linus Torvalds
parent 3560e249ab
commit 2be0ffe2b2
2 changed files with 56 additions and 0 deletions
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3
include/linux/gfp.h
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@ -228,6 +228,9 @@ extern struct page *alloc_page_vma(gfp_t gfp_mask,
extern unsigned long __get_free_pages(gfp_t gfp_mask, unsigned int order);
extern unsigned long get_zeroed_page(gfp_t gfp_mask);
void *alloc_pages_exact(size_t size, gfp_t gfp_mask);
void free_pages_exact(void *virt, size_t size);
#define __get_free_page(gfp_mask) \
__get_free_pages((gfp_mask),0)