linux-kernel - [PATCH v3 3/9] mm/page_owner: copy last_migrate_reason in copy_page

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Date:	Fri, 17 Jun 2016 16:57:33 +0900
From:	js1304@...il.com
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Vlastimil Babka <vbabka@...e.cz>, mgorman@...hsingularity.net,
	Minchan Kim <minchan@...nel.org>,
	Alexander Potapenko <glider@...gle.com>,
	Hugh Dickins <hughd@...gle.com>,
	Michal Hocko <mhocko@...nel.org>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, Sasha Levin <sasha.levin@...cle.com>,
	Joonsoo Kim <iamjoonsoo.kim@....com>
Subject: [PATCH v3 3/9] mm/page_owner: copy last_migrate_reason in copy_page_owner()

From: Joonsoo Kim <iamjoonsoo.kim@....com>

Currently, copy_page_owner() doesn't copy all the owner information.  It
skips last_migrate_reason because copy_page_owner() is used for migration
and it will be properly set soon.  But, following patch will use
copy_page_owner() and this skip will cause the problem that allocated page
has uninitialied last_migrate_reason.  To prevent it, this patch also copy
last_migrate_reason in copy_page_owner().

Link: http://lkml.kernel.org/r/1464230275-25791-3-git-send-email-iamjoonsoo.kim@lge.com
Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@....com>
Acked-by: Vlastimil Babka <vbabka@...e.cz>
Cc: Mel Gorman <mgorman@...hsingularity.net>
Cc: Minchan Kim <minchan@...nel.org>
Cc: Alexander Potapenko <glider@...gle.com>
Cc: Hugh Dickins <hughd@...gle.com>
Cc: Michal Hocko <mhocko@...nel.org>
---
 mm/page_owner.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/mm/page_owner.c b/mm/page_owner.c
index c6cda3e..73e202f 100644
--- a/mm/page_owner.c
+++ b/mm/page_owner.c
@@ -118,6 +118,7 @@ void __copy_page_owner(struct page *oldpage, struct page *newpage)
 
 	new_ext->order = old_ext->order;
 	new_ext->gfp_mask = old_ext->gfp_mask;
+	new_ext->last_migrate_reason = old_ext->last_migrate_reason;
 	new_ext->nr_entries = old_ext->nr_entries;
 
 	for (i = 0; i < ARRAY_SIZE(new_ext->trace_entries); i++)
-- 
1.9.1