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hugetlb: redefine hugepage copy functions

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This patch modifies hugepage copy functions to have only destination
and source hugepages as arguments for later use.
The old ones are renamed from copy_{gigantic,huge}_page() to
copy_user_{gigantic,huge}_page().
This naming convention is consistent with that between copy_highpage()
and copy_user_highpage().

ChangeLog since v4:
- add blank line between local declaration and code
- remove unnecessary might_sleep()

ChangeLog since v2:
- change copy_huge_page() from macro to inline dummy function
  to avoid compile warning when !CONFIG_HUGETLB_PAGE.

Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Acked-by: Mel Gorman <mel@csn.ul.ie>
Reviewed-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Andi Kleen <ak@linux.intel.com>
This commit is contained in:
Naoya Horiguchi 2010-09-08 10:19:34 +09:00 committed by Andi Kleen
parent bf50bab2b3
commit 0ebabb416f
2 changed files with 44 additions and 5 deletions
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4
include/linux/hugetlb.h
View File

@ -44,6 +44,7 @@ int hugetlb_reserve_pages(struct inode *inode, long from, long to,
int acctflags);
void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed);
void __isolate_hwpoisoned_huge_page(struct page *page);
void copy_huge_page(struct page *dst, struct page *src);
extern unsigned long hugepages_treat_as_movable;
extern const unsigned long hugetlb_zero, hugetlb_infinity;
@ -102,6 +103,9 @@ static inline void hugetlb_report_meminfo(struct seq_file *m)
#define hugetlb_fault(mm, vma, addr, flags) ({ BUG(); 0; })
#define huge_pte_offset(mm, address) 0
#define __isolate_hwpoisoned_huge_page(page) 0
static inline void copy_huge_page(struct page *dst, struct page *src)
{
}
#define hugetlb_change_protection(vma, address, end, newprot)

45
mm/hugetlb.c
View File

@ -423,14 +423,14 @@ static void clear_huge_page(struct page *page,
}
}
static void copy_gigantic_page(struct page *dst, struct page *src,
static void copy_user_gigantic_page(struct page *dst, struct page *src,
unsigned long addr, struct vm_area_struct *vma)
{
int i;
struct hstate *h = hstate_vma(vma);
struct page *dst_base = dst;
struct page *src_base = src;
might_sleep();
for (i = 0; i < pages_per_huge_page(h); ) {
cond_resched();
copy_user_highpage(dst, src, addr + i*PAGE_SIZE, vma);
@ -440,14 +440,15 @@ static void copy_gigantic_page(struct page *dst, struct page *src,
src = mem_map_next(src, src_base, i);
}
}
static void copy_huge_page(struct page *dst, struct page *src,
static void copy_user_huge_page(struct page *dst, struct page *src,
unsigned long addr, struct vm_area_struct *vma)
{
int i;
struct hstate *h = hstate_vma(vma);
if (unlikely(pages_per_huge_page(h) > MAX_ORDER_NR_PAGES)) {
copy_gigantic_page(dst, src, addr, vma);
copy_user_gigantic_page(dst, src, addr, vma);
return;
}
@ -458,6 +459,40 @@ static void copy_huge_page(struct page *dst, struct page *src,
}
}
static void copy_gigantic_page(struct page *dst, struct page *src)
{
int i;
struct hstate *h = page_hstate(src);
struct page *dst_base = dst;
struct page *src_base = src;
for (i = 0; i < pages_per_huge_page(h); ) {
cond_resched();
copy_highpage(dst, src);
i++;
dst = mem_map_next(dst, dst_base, i);
src = mem_map_next(src, src_base, i);
}
}
void copy_huge_page(struct page *dst, struct page *src)
{
int i;
struct hstate *h = page_hstate(src);
if (unlikely(pages_per_huge_page(h) > MAX_ORDER_NR_PAGES)) {
copy_gigantic_page(dst, src);
return;
}
might_sleep();
for (i = 0; i < pages_per_huge_page(h); i++) {
cond_resched();
copy_highpage(dst + i, src + i);
}
}
static void enqueue_huge_page(struct hstate *h, struct page *page)
{
int nid = page_to_nid(page);
@ -2412,7 +2447,7 @@ retry_avoidcopy:
if (unlikely(anon_vma_prepare(vma)))
return VM_FAULT_OOM;
copy_huge_page(new_page, old_page, address, vma);
copy_user_huge_page(new_page, old_page, address, vma);
__SetPageUptodate(new_page);
/*