mm: fix tracing in free_pcppages_bulk()

page->private gets re-used in __free_one_page() to store page order
(so trace_mm_page_pcpu_drain() may print order instead of migratetype)
thus migratetype value must be cached locally.

Fixes regression introduced in commit a7016235a61d ("mm: fix migratetype
bug which slowed swapping").  This caused incorrect data to be attached
to the mm_page_pcpu_drain trace event.

[akpm@linux-foundation.org: add comment]
Cc: Marek Szyprowski <m.szyprowski@samsung.com>
Cc: Michal Nazarewicz <mina86@mina86.com>
Acked-by: Minchan Kim <minchan@kernel.org>
Acked-by: Mel Gorman <mgorman@suse.de>
Cc: Hugh Dickins <hughd@google.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Acked-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 5 insertions, 2 deletions

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index cefd14e6dcf2..3f18a14effb8 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -668,12 +668,15 @@ static void free_pcppages_bulk(struct zone *zone, int count,
                         batch_free = to_free;
 
                 do {
+                        int mt; /* migratetype of the to-be-freed page */
+
                         page = list_entry(list->prev, struct page, lru);
                         /* must delete as __free_one_page list manipulates */
                         list_del(&page->lru);
+                        mt = page_private(page);
                         /* MIGRATE_MOVABLE list may include MIGRATE_RESERVEs */
-                        __free_one_page(page, zone, 0, page_private(page));
-                        trace_mm_page_pcpu_drain(page, 0, page_private(page));
+                        __free_one_page(page, zone, 0, mt);
+                        trace_mm_page_pcpu_drain(page, 0, mt);
                 } while (--to_free && --batch_free && !list_empty(list));
         }
         __mod_zone_page_state(zone, NR_FREE_PAGES, count);