From 4101196b19d7f905dca5dcf46cd35eb758cf06c0 Mon Sep 17 00:00:00 2001 From: "Matthew Wilcox (Oracle)" Date: Mon, 23 Sep 2019 15:34:52 -0700 Subject: mm: page cache: store only head pages in i_pages Transparent Huge Pages are currently stored in i_pages as pointers to consecutive subpages. This patch changes that to storing consecutive pointers to the head page in preparation for storing huge pages more efficiently in i_pages. Large parts of this are "inspired" by Kirill's patch https://lore.kernel.org/lkml/20170126115819.58875-2-kirill.shutemov@linux.intel.com/ Kirill and Huang Ying contributed several fixes. [willy@infradead.org: use compound_nr, squish uninit-var warning] Link: http://lkml.kernel.org/r/20190731210400.7419-1-willy@infradead.org Signed-off-by: Matthew Wilcox Acked-by: Jan Kara Reviewed-by: Kirill Shutemov Reviewed-by: Song Liu Tested-by: Song Liu Tested-by: William Kucharski Reviewed-by: William Kucharski Tested-by: Qian Cai Tested-by: Mikhail Gavrilov Cc: Hugh Dickins Cc: Chris Wilson Cc: Song Liu Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/shmem.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'mm/shmem.c') diff --git a/mm/shmem.c b/mm/shmem.c index 15d26c86e5ef..57a6aedf6649 100644 --- a/mm/shmem.c +++ b/mm/shmem.c @@ -631,7 +631,7 @@ static int shmem_add_to_page_cache(struct page *page, if (xas_error(&xas)) goto unlock; next: - xas_store(&xas, page + i); + xas_store(&xas, page); if (++i < nr) { xas_next(&xas); goto next; -- cgit v1.2.3