From a9627bc5e34e79ae80a33241b8a1501cc498e191 Mon Sep 17 00:00:00 2001 From: Joonsoo Kim Date: Tue, 26 Jul 2016 15:23:49 -0700 Subject: mm/page_owner: introduce split_page_owner and replace manual handling split_page() calls set_page_owner() to set up page_owner to each pages. But, it has a drawback that head page and the others have different stacktrace because callsite of set_page_owner() is slightly differnt. To avoid this problem, this patch copies head page's page_owner to the others. It needs to introduce new function, split_page_owner() but it also remove the other function, get_page_owner_gfp() so looks good to do. Link: http://lkml.kernel.org/r/1464230275-25791-4-git-send-email-iamjoonsoo.kim@lge.com Signed-off-by: Joonsoo Kim Acked-by: Vlastimil Babka Cc: Mel Gorman Cc: Minchan Kim Cc: Alexander Potapenko Cc: Hugh Dickins Cc: Michal Hocko Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/page_owner.c | 14 +++++++------- 1 file changed, 7 insertions(+), 7 deletions(-) (limited to 'mm/page_owner.c') diff --git a/mm/page_owner.c b/mm/page_owner.c index 437877f5b774..31b69437a3d6 100644 --- a/mm/page_owner.c +++ b/mm/page_owner.c @@ -94,17 +94,17 @@ void __set_page_owner_migrate_reason(struct page *page, int reason) page_ext->last_migrate_reason = reason; } -gfp_t __get_page_owner_gfp(struct page *page) +void __split_page_owner(struct page *page, unsigned int order) { + int i; struct page_ext *page_ext = lookup_page_ext(page); + if (unlikely(!page_ext)) - /* - * The caller just returns 0 if no valid gfp - * So return 0 here too. - */ - return 0; + return; - return page_ext->gfp_mask; + page_ext->order = 0; + for (i = 1; i < (1 << order); i++) + __copy_page_owner(page, page + i); } void __copy_page_owner(struct page *oldpage, struct page *newpage) -- cgit v1.2.3-55-g7522