diff options
Diffstat (limited to 'mm/huge_memory.c')
| -rw-r--r-- | mm/huge_memory.c | 21 |
1 files changed, 15 insertions, 6 deletions
diff --git a/mm/huge_memory.c b/mm/huge_memory.c index 45eaae030628..2ed1a160a85b 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -1559,7 +1559,8 @@ static int __split_huge_page_splitting(struct page *page, return ret; } -static void __split_huge_page_refcount(struct page *page) +static void __split_huge_page_refcount(struct page *page, + struct list_head *list) { int i; struct zone *zone = page_zone(page); @@ -1645,7 +1646,7 @@ static void __split_huge_page_refcount(struct page *page) BUG_ON(!PageDirty(page_tail)); BUG_ON(!PageSwapBacked(page_tail)); - lru_add_page_tail(page, page_tail, lruvec); + lru_add_page_tail(page, page_tail, lruvec, list); } atomic_sub(tail_count, &page->_count); BUG_ON(atomic_read(&page->_count) <= 0); @@ -1752,7 +1753,8 @@ static int __split_huge_page_map(struct page *page, /* must be called with anon_vma->root->rwsem held */ static void __split_huge_page(struct page *page, - struct anon_vma *anon_vma) + struct anon_vma *anon_vma, + struct list_head *list) { int mapcount, mapcount2; pgoff_t pgoff = page->index << (PAGE_CACHE_SHIFT - PAGE_SHIFT); @@ -1783,7 +1785,7 @@ static void __split_huge_page(struct page *page, mapcount, page_mapcount(page)); BUG_ON(mapcount != page_mapcount(page)); - __split_huge_page_refcount(page); + __split_huge_page_refcount(page, list); mapcount2 = 0; anon_vma_interval_tree_foreach(avc, &anon_vma->rb_root, pgoff, pgoff) { @@ -1798,7 +1800,14 @@ static void __split_huge_page(struct page *page, BUG_ON(mapcount != mapcount2); } -int split_huge_page(struct page *page) +/* + * Split a hugepage into normal pages. This doesn't change the position of head + * page. If @list is null, tail pages will be added to LRU list, otherwise, to + * @list. Both head page and tail pages will inherit mapping, flags, and so on + * from the hugepage. + * Return 0 if the hugepage is split successfully otherwise return 1. + */ +int split_huge_page_to_list(struct page *page, struct list_head *list) { struct anon_vma *anon_vma; int ret = 1; @@ -1823,7 +1832,7 @@ int split_huge_page(struct page *page) goto out_unlock; BUG_ON(!PageSwapBacked(page)); - __split_huge_page(page, anon_vma); + __split_huge_page(page, anon_vma, list); count_vm_event(THP_SPLIT); BUG_ON(PageCompound(page)); |