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[PATCH v3 3/9] mm/page_owner: copy last_migrate_reason in copy_page_owner()

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From: Joonsoo Kim <iamjoonsoo.kim@lge.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@lge.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Mel Gorman <mgorman@techsingularity.net>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Alexander Potapenko <glider@google.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Michal Hocko <mhocko@kernel.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

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[PATCH v3 0/9] reduce memory usage by page_owner js1304@gmail.com - 2016-06-17 10:00 +0200
  [PATCH v3 9/9] mm/page_isolation: clean up confused code js1304@gmail.com - 2016-06-17 10:00 +0200
    Re: [PATCH v3 9/9] mm/page_isolation: clean up confused code Vlastimil Babka <vbabka@suse.cz> - 2016-06-17 15:40 +0200
  [PATCH v3 5/9] tools/vm/page_owner: increase temporary buffer size js1304@gmail.com - 2016-06-17 10:00 +0200
    Re: [PATCH v3 5/9] tools/vm/page_owner: increase temporary buffer  size Vlastimil Babka <vbabka@suse.cz> - 2016-06-17 15:00 +0200
  [PATCH v3 1/9] mm/compaction: split freepages without holding the zone lock js1304@gmail.com - 2016-06-17 10:10 +0200
  [PATCH v3 3/9] mm/page_owner: copy last_migrate_reason in copy_page_owner() js1304@gmail.com - 2016-06-17 10:10 +0200

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