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Commit 8e7e40d9 authored by Shaohua Li's avatar Shaohua Li Committed by Linus Torvalds
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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: default avatarShaohua 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: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 6fb332fa

mm/page_alloc.c

+4 −1
Original line number Original line Diff line number Diff line
@@ -4906,13 +4906,16 @@ int set_migratetype_isolate(struct page *page) 
	struct zone *zone;

	struct zone *zone;

	unsigned long flags;

	unsigned long flags;

	int ret = -EBUSY;

	int ret = -EBUSY;

	int zone_idx;





	zone = page_zone(page);

	zone = page_zone(page);

	zone_idx = zone_idx(zone);

	spin_lock_irqsave(&zone->lock, flags);

	spin_lock_irqsave(&zone->lock, flags);

	/*

	/*

	 * In future, more migrate types will be able to be isolation target.

	 * 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;

		goto out;

	set_pageblock_migratetype(page, MIGRATE_ISOLATE);

	set_pageblock_migratetype(page, MIGRATE_ISOLATE);

	move_freepages_block(zone, page, MIGRATE_ISOLATE);

	move_freepages_block(zone, page, MIGRATE_ISOLATE);