On Fri, 13 Apr 2012, Haojian Zhuang wrote: > I have one question on memory migration. As we know, malloc() from > user app will allocate MIGRATE_MOVABLE pages. But if we want to use > this memory as DMA usage, we can't accept MIGRATE_MOVABLE type. Could > we change its behavior before DMA working? MIGRATE_MOVABLE works fine for DMA. If you keep a reference from a device driver to user pages then you will have to increase the page refcount which will in turn pin the page and make it non movable for as long as you keep the refcount. -- 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/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>