path: root/mm/page_alloc.c
diff options
authorShaohua Li <>2009-09-21 17:01:18 -0700
committerLinus Torvalds <>2009-09-22 07:17:26 -0700
commit8e7e40d9658cf7b2ae2b76484e235799b3ddaa97 (patch)
tree7dfc66d7878d5d4df8f29c56f9195f653626c378 /mm/page_alloc.c
parent6fb332fabd7288af9dbe7992394aa6ba97c1a537 (diff)
memory hotplug: make pages from movable zone always isolatable
Pages on movable zone have two types, MIGRATE_MOVABLE and MIGRATE_RESERVE, both them can be movable, because only movable memory allocation can get pages from movable zone. This makes pages in movable zone always be able to migrate. Signed-off-by: Shaohua Li <> Cc: Mel Gorman <> Cc: Christoph Lameter <> Cc: Yakui Zhao <> Signed-off-by: Andrew Morton <> Signed-off-by: Linus Torvalds <>
Diffstat (limited to 'mm/page_alloc.c')
1 files changed, 4 insertions, 1 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 8a830271172..7b4d4e4ea64 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -4906,13 +4906,16 @@ int set_migratetype_isolate(struct page *page)
struct zone *zone;
unsigned long flags;
int ret = -EBUSY;
+ int zone_idx;
zone = page_zone(page);
+ zone_idx = zone_idx(zone);
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)
+ if (get_pageblock_migratetype(page) != MIGRATE_MOVABLE &&
+ zone_idx != ZONE_MOVABLE)
goto out;
set_pageblock_migratetype(page, MIGRATE_ISOLATE);
move_freepages_block(zone, page, MIGRATE_ISOLATE);