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author | Andrea Arcangeli <aarcange@redhat.com> | 2011-01-13 15:46:47 -0800 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-01-13 17:32:41 -0800 |
commit | 47ad8475c000141eacb3ecda5e5ce4b43a9cd04d (patch) | |
tree | 78c29aaf2ae9340e314a25ea08e9724471cf4414 /mm/memory.c | |
parent | 3f04f62f90d46a82dd73027c5fd7a15daed5c33d (diff) | |
download | linux-47ad8475c000141eacb3ecda5e5ce4b43a9cd04d.tar.gz linux-47ad8475c000141eacb3ecda5e5ce4b43a9cd04d.tar.bz2 linux-47ad8475c000141eacb3ecda5e5ce4b43a9cd04d.zip |
thp: clear_copy_huge_page
Move the copy/clear_huge_page functions to common code to share between
hugetlb.c and huge_memory.c.
Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
Acked-by: Rik van Riel <riel@redhat.com>
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>
Diffstat (limited to 'mm/memory.c')
-rw-r--r-- | mm/memory.c | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/mm/memory.c b/mm/memory.c index 567bca80ea53..60e1c68d8218 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -3645,3 +3645,74 @@ void might_fault(void) } EXPORT_SYMBOL(might_fault); #endif + +#if defined(CONFIG_TRANSPARENT_HUGEPAGE) || defined(CONFIG_HUGETLBFS) +static void clear_gigantic_page(struct page *page, + unsigned long addr, + unsigned int pages_per_huge_page) +{ + int i; + struct page *p = page; + + might_sleep(); + for (i = 0; i < pages_per_huge_page; + i++, p = mem_map_next(p, page, i)) { + cond_resched(); + clear_user_highpage(p, addr + i * PAGE_SIZE); + } +} +void clear_huge_page(struct page *page, + unsigned long addr, unsigned int pages_per_huge_page) +{ + int i; + + if (unlikely(pages_per_huge_page > MAX_ORDER_NR_PAGES)) { + clear_gigantic_page(page, addr, pages_per_huge_page); + return; + } + + might_sleep(); + for (i = 0; i < pages_per_huge_page; i++) { + cond_resched(); + clear_user_highpage(page + i, addr + i * PAGE_SIZE); + } +} + +static void copy_user_gigantic_page(struct page *dst, struct page *src, + unsigned long addr, + struct vm_area_struct *vma, + unsigned int pages_per_huge_page) +{ + int i; + struct page *dst_base = dst; + struct page *src_base = src; + + for (i = 0; i < pages_per_huge_page; ) { + cond_resched(); + copy_user_highpage(dst, src, addr + i*PAGE_SIZE, vma); + + i++; + dst = mem_map_next(dst, dst_base, i); + src = mem_map_next(src, src_base, i); + } +} + +void copy_user_huge_page(struct page *dst, struct page *src, + unsigned long addr, struct vm_area_struct *vma, + unsigned int pages_per_huge_page) +{ + int i; + + if (unlikely(pages_per_huge_page > MAX_ORDER_NR_PAGES)) { + copy_user_gigantic_page(dst, src, addr, vma, + pages_per_huge_page); + return; + } + + might_sleep(); + for (i = 0; i < pages_per_huge_page; i++) { + cond_resched(); + copy_user_highpage(dst + i, src + i, addr + i*PAGE_SIZE, vma); + } +} +#endif /* CONFIG_TRANSPARENT_HUGEPAGE || CONFIG_HUGETLBFS */ |