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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 <shaohua.li@intel.com>
Cc: Mel Gorman <mel@csn.ul.ie>
Cc: Christoph Lameter <cl@linux-foundation.org>
Cc: Yakui Zhao <yakui.zhao@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Shaohua Li 2009-09-21 17:01:18 -07:00 committed by Linus Torvalds
parent 6fb332fabd
commit 8e7e40d965
1 changed files with 4 additions and 1 deletions
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5
mm/page_alloc.c
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@ -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);