On 08/08/2012 06:53 PM, Rafael Aquini wrote:
Memory fragmentation introduced by ballooning might reduce significantly the number of 2MB contiguous memory blocks that can be used within a guest, thus imposing performance penalties associated with the reduced number of transparent huge pages that could be used by the guest workload. Besides making balloon pages movable at allocation time and introducing the necessary primitives to perform balloon page migration/compaction, this patch also introduces the following locking scheme to provide the proper synchronization and protection for struct virtio_balloon elements against concurrent accesses due to parallel operations introduced by memory compaction / page migration. - balloon_lock (mutex) : synchronizes the access demand to elements of struct virtio_balloon and its queue operations; - pages_lock (spinlock): special protection to balloon pages list against concurrent list handling operations; Signed-off-by: Rafael Aquini<aquini@xxxxxxxxxx>
Reviewed-by: Rik van Riel <riel@xxxxxxxxxx> -- All rights reversed -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>