> > In addtion, new order is always less than old order in that context. > > so big order page reclaim makes much safe for low order pages. > big order page reclaim makes we have more chances to reclaim useful > pages by lumpy, why it's safe? Because some crappy driver try high order GFP_ATOMIC allocation and they often don't have enough failure handling. Even though they have good allocation failure handling, network packet loss (wireless drivers are one of most big high order GFP_ATOMIC user) is usually big impact than page cache drop/re-readings. Thanks. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom policy in Canada: sign http://dissolvethecrtc.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>