From: Michal Nazarewicz <mina86@xxxxxxxxxx> If page is on PCP list while pageblock it belongs to gets isolated, the page's private still holds the old migrate type. This means that free_pcppages_bulk() will put the page on a freelist of the old migrate type instead of MIGRATE_ISOLATE. This commit changes that by explicitly checking whether page's pageblock's migrate type is MIGRATE_ISOLATE and if it is, overwrites page's private data. Signed-off-by: Michal Nazarewicz <mina86@xxxxxxxxxx> Signed-off-by: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx> --- mm/page_alloc.c | 12 ++++++++++++ 1 files changed, 12 insertions(+), 0 deletions(-) diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 9dd443d..58d1a2e 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -628,6 +628,18 @@ static void free_pcppages_bulk(struct zone *zone, int count, page = list_entry(list->prev, struct page, lru); /* must delete as __free_one_page list manipulates */ list_del(&page->lru); + + /* + * When page is isolated in set_migratetype_isolate() + * function it's page_private is not changed since the + * function has no way of knowing if it can touch it. + * This means that when a page is on PCP list, it's + * page_private no longer matches the desired migrate + * type. + */ + if (get_pageblock_migratetype(page) == MIGRATE_ISOLATE) + set_page_private(page, MIGRATE_ISOLATE); + /* 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)); -- 1.7.1.569.g6f426 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>