diff options
| -rw-r--r-- | mm/page_alloc.c | 10 | ||||
| -rw-r--r-- | mm/page_isolation.c | 5 |
2 files changed, 12 insertions, 3 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c index eb79d2af9de6..ea7b697bcf6c 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -901,13 +901,17 @@ static inline void add_to_free_list_tail(struct page *page, struct zone *zone, area->nr_free++; } -/* Used for pages which are on another list */ +/* + * Used for pages which are on another list. Move the pages to the tail + * of the list - so the moved pages won't immediately be considered for + * allocation again (e.g., optimization for memory onlining). + */ static inline void move_to_free_list(struct page *page, struct zone *zone, unsigned int order, int migratetype) { struct free_area *area = &zone->free_area[order]; - list_move(&page->lru, &area->free_list[migratetype]); + list_move_tail(&page->lru, &area->free_list[migratetype]); } static inline void del_page_from_free_list(struct page *page, struct zone *zone, @@ -2340,7 +2344,7 @@ static inline struct page *__rmqueue_cma_fallback(struct zone *zone, #endif /* - * Move the free pages in a range to the free lists of the requested type. + * Move the free pages in a range to the freelist tail of the requested type. * Note that start_page and end_pages are not aligned on a pageblock * boundary. If alignment is required, use move_freepages_block() */ diff --git a/mm/page_isolation.c b/mm/page_isolation.c index abfe26ad59fd..83692b937784 100644 --- a/mm/page_isolation.c +++ b/mm/page_isolation.c @@ -106,6 +106,11 @@ static void unset_migratetype_isolate(struct page *page, unsigned migratetype) * If we isolate freepage with more than pageblock_order, there * should be no freepage in the range, so we could avoid costly * pageblock scanning for freepage moving. + * + * We didn't actually touch any of the isolated pages, so place them + * to the tail of the freelist. This is an optimization for memory + * onlining - just onlined memory won't immediately be considered for + * allocation. */ if (!isolated_page) { nr_pages = move_freepages_block(zone, page, migratetype, NULL); |