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| author | Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com> | 2012-10-08 16:31:57 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-10-09 16:22:44 +0900 |
| commit | 770c8aaaf6f04a87e6765f24d497132de9152a46 (patch) | |
| tree | c93d594ad97750bee9115778ddc160e0414c342a /mm | |
| parent | 02c6de8d757cb32c0829a45d81c3dfcbcafd998b (diff) | |
| download | lwn-770c8aaaf6f04a87e6765f24d497132de9152a46.tar.gz lwn-770c8aaaf6f04a87e6765f24d497132de9152a46.zip | |
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>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/page_alloc.c | 7 |
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); |