Messages in this thread Patch in this message | | | Subject | [RFC] move free page back to MIGRATE_MOVABLE? | From | Shaohua Li <> | Date | Thu, 13 Dec 2007 13:19:59 +0800 |
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pages are MIGRATE_MOVABLE initially, and fallback to other types. If the pages are freed, I wonder why not move them back to MIGRATE_MOVABLE. This, for example, can help memory remove.
Thanks, Shaohua
Index: linux/mm/page_alloc.c =================================================================== --- linux.orig/mm/page_alloc.c 2007-12-13 11:44:36.000000000 +0800 +++ linux/mm/page_alloc.c 2007-12-13 12:04:59.000000000 +0800 @@ -386,6 +386,9 @@ static inline int page_is_buddy(struct p return 0; } +int move_freepages(struct zone *zone, + struct page *start_page, struct page *end_page, + int migratetype); /* * Freeing function for a buddy system allocator. * @@ -446,6 +449,17 @@ static inline void __free_one_page(struc list_add(&page->lru, &zone->free_area[order].free_list[migratetype]); zone->free_area[order].nr_free++; + + if (order >= pageblock_order && migratetype != MIGRATE_MOVABLE) { + struct page *tmp = page; + + move_freepages(zone, page, page + (1 << order) - 1, MIGRATE_MOVABLE); + + while (tmp < page + (1 << order)) { + set_pageblock_migratetype(tmp, MIGRATE_MOVABLE); + tmp += pageblock_nr_pages; + } + } } static inline int free_pages_check(struct page *page)
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