于 2012年08月13日 03:14, Marek Vasut 写道: > Don't forget the malloc header and padding around malloc()'d space. So you're > behind the 2 * PAGESIZE anyway. > sorry, I misunderstood your meaning. My meaning is even the SLUB maybe costs some extra memory, it still save much memory then we use the devm_kzalloc(). thanks Huang Shijie