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Commit d44d363f authored by Shaohua Li's avatar Shaohua Li Committed by Linus Torvalds
Browse files

mm: don't assume anonymous pages have SwapBacked flag 

There are a few places the code assumes anonymous pages should have
SwapBacked flag set.  MADV_FREE pages are anonymous pages but we are
going to add them to LRU_INACTIVE_FILE list and clear SwapBacked flag
for them.  The assumption doesn't hold any more, so fix them.

Link: http://lkml.kernel.org/r/3945232c0df3dd6c4ef001976f35a95f18dcb407.1487965799.git.shli@fb.com


Signed-off-by: default avatarShaohua Li <shli@fb.com>
Acked-by: default avatarJohannes Weiner <hannes@cmpxchg.org>
Acked-by: default avatarHillf Danton <hillf.zj@alibaba-inc.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Hugh Dickins <hughd@google.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Mel Gorman <mgorman@techsingularity.net>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent a128ca71

mm/huge_memory.c

+0 −1
Original line number Diff line number Diff line
@@ -2399,7 +2399,6 @@ int split_huge_page_to_list(struct page *page, struct list_head *list) 


	VM_BUG_ON_PAGE(is_huge_zero_page(page), page);

	VM_BUG_ON_PAGE(!PageLocked(page), page);

	VM_BUG_ON_PAGE(!PageSwapBacked(page), page);

	VM_BUG_ON_PAGE(!PageCompound(page), page);



	if (PageAnon(head)) {

mm/khugepaged.c

+3 −5
Original line number Diff line number Diff line
@@ -483,8 +483,7 @@ void __khugepaged_exit(struct mm_struct *mm) 


static void release_pte_page(struct page *page)

{

	/* 0 stands for page_is_file_cache(page) == false */

	dec_node_page_state(page, NR_ISOLATED_ANON + 0);

	dec_node_page_state(page, NR_ISOLATED_ANON + page_is_file_cache(page));

	unlock_page(page);

	putback_lru_page(page);

}
@@ -532,7 +531,6 @@ static int __collapse_huge_page_isolate(struct vm_area_struct *vma, 


		VM_BUG_ON_PAGE(PageCompound(page), page);

		VM_BUG_ON_PAGE(!PageAnon(page), page);

		VM_BUG_ON_PAGE(!PageSwapBacked(page), page);



		/*

		 * We can do it before isolate_lru_page because the
@@ -579,8 +577,8 @@ static int __collapse_huge_page_isolate(struct vm_area_struct *vma, 
			result = SCAN_DEL_PAGE_LRU;

			goto out;

		}

		/* 0 stands for page_is_file_cache(page) == false */

		inc_node_page_state(page, NR_ISOLATED_ANON + 0);

		inc_node_page_state(page,

				NR_ISOLATED_ANON + page_is_file_cache(page));

		VM_BUG_ON_PAGE(!PageLocked(page), page);

		VM_BUG_ON_PAGE(PageLRU(page), page);

mm/migrate.c

+2 −1
Original line number Diff line number Diff line
@@ -1944,6 +1944,7 @@ int migrate_misplaced_transhuge_page(struct mm_struct *mm, 


	/* Prepare a page as a migration target */

	__SetPageLocked(new_page);

	if (PageSwapBacked(page))

		__SetPageSwapBacked(new_page);



	/* anon mapping, we can simply copy page->mapping to the new page: */

mm/rmap.c

+2 −1
Original line number Diff line number Diff line
@@ -1424,7 +1424,8 @@ static int try_to_unmap_one(struct page *page, struct vm_area_struct *vma, 
			 * Store the swap location in the pte.

			 * See handle_pte_fault() ...

			 */

			VM_BUG_ON_PAGE(!PageSwapCache(page), page);

			VM_BUG_ON_PAGE(!PageSwapCache(page) && PageSwapBacked(page),

				page);



			if (!PageDirty(page)) {

				/* It's a freeable page by MADV_FREE */