From 46f24fd857b37bb86ddd5d0ac3d194e984dfdf1c Mon Sep 17 00:00:00 2001 From: Joonsoo Kim Date: Tue, 26 Jul 2016 15:23:58 -0700 Subject: mm/page_alloc: introduce post allocation processing on page allocator This patch is motivated from Hugh and Vlastimil's concern [1]. There are two ways to get freepage from the allocator. One is using normal memory allocation API and the other is __isolate_free_page() which is internally used for compaction and pageblock isolation. Later usage is rather tricky since it doesn't do whole post allocation processing done by normal API. One problematic thing I already know is that poisoned page would not be checked if it is allocated by __isolate_free_page(). Perhaps, there would be more. We could add more debug logic for allocated page in the future and this separation would cause more problem. I'd like to fix this situation at this time. Solution is simple. This patch commonize some logic for newly allocated page and uses it on all sites. This will solve the problem. [1] http://marc.info/?i=alpine.LSU.2.11.1604270029350.7066%40eggly.anvils%3E [iamjoonsoo.kim@lge.com: mm-page_alloc-introduce-post-allocation-processing-on-page-allocator-v3] Link: http://lkml.kernel.org/r/1464230275-25791-7-git-send-email-iamjoonsoo.kim@lge.com Link: http://lkml.kernel.org/r/1466150259-27727-9-git-send-email-iamjoonsoo.kim@lge.com Link: http://lkml.kernel.org/r/1464230275-25791-7-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_isolation.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) (limited to 'mm/page_isolation.c') diff --git a/mm/page_isolation.c b/mm/page_isolation.c index 927f5ee24c87..4639163b78f9 100644 --- a/mm/page_isolation.c +++ b/mm/page_isolation.c @@ -128,9 +128,7 @@ static void unset_migratetype_isolate(struct page *page, unsigned migratetype) out: spin_unlock_irqrestore(&zone->lock, flags); if (isolated_page) { - kernel_map_pages(page, (1 << order), 1); - set_page_refcounted(page); - set_page_owner(page, order, __GFP_MOVABLE); + post_alloc_hook(page, order, __GFP_MOVABLE); __free_pages(isolated_page, order); } } -- cgit v1.2.3