diff options
Diffstat (limited to 'mm/page_alloc.c')
| -rw-r--r-- | mm/page_alloc.c | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 71ced519c31..a44715e8205 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -41,6 +41,7 @@ #include <linux/pfn.h> #include <linux/backing-dev.h> #include <linux/fault-inject.h> +#include <linux/page-isolation.h> #include <asm/tlbflush.h> #include <asm/div64.h> @@ -4433,3 +4434,46 @@ void set_pageblock_flags_group(struct page *page, unsigned long flags, else __clear_bit(bitidx + start_bitidx, bitmap); } + +/* + * This is designed as sub function...plz see page_isolation.c also. + * set/clear page block's type to be ISOLATE. + * page allocater never alloc memory from ISOLATE block. + */ + +int set_migratetype_isolate(struct page *page) +{ + struct zone *zone; + unsigned long flags; + int ret = -EBUSY; + + zone = page_zone(page); + spin_lock_irqsave(&zone->lock, flags); + /* + * In future, more migrate types will be able to be isolation target. + */ + if (get_pageblock_migratetype(page) != MIGRATE_MOVABLE) + goto out; + set_pageblock_migratetype(page, MIGRATE_ISOLATE); + move_freepages_block(zone, page, MIGRATE_ISOLATE); + ret = 0; +out: + spin_unlock_irqrestore(&zone->lock, flags); + if (!ret) + drain_all_local_pages(); + return ret; +} + +void unset_migratetype_isolate(struct page *page) +{ + struct zone *zone; + unsigned long flags; + zone = page_zone(page); + spin_lock_irqsave(&zone->lock, flags); + if (get_pageblock_migratetype(page) != MIGRATE_ISOLATE) + goto out; + set_pageblock_migratetype(page, MIGRATE_MOVABLE); + move_freepages_block(zone, page, MIGRATE_MOVABLE); +out: + spin_unlock_irqrestore(&zone->lock, flags); +} |