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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