page->private gets re-used in __free_one_page() to store page order
so migratetype value must be cached locally.
Fixes regression introduced in a701623 ("mm: fix migratetype bug
which slowed swapping").
Cc: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
Cc: Michal Nazarewicz <mina86@xxxxxxxxxx>
Cc: Minchan Kim <minchan@xxxxxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxx>
Cc: Hugh Dickins <hughd@xxxxxxxxxx>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@xxxxxxxxxxx>
Signed-off-by: Kyungmin Park <kyungmin.park@xxxxxxxxxxx>
---
mm/page_alloc.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 93a3433..e9da55c 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;
+
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);
--
1.7.11.3
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