Sorry, Mel, I've had to revert this patch (and its two little children) from my 3.2.0-rc6-next-20111222 testing: you really do need a page flag (or substitute) for your "immediate" lru. How else can a del_page_from_lru[_list]() know whether to decrement the count of the immediate or the inactive list? page_lru() says to decrement the count of the inactive list, so in due course that wraps to a gigantic number, and then page reclaim livelocks trying to wring pages out of an empty list. It's the memcg case I've been hitting, but presumably the same happens with global counts. There is another such accounting bug in -next, been there longer and not so easy to hit: I'm fairly sure it will turn out to be memcg misaccounting a THPage somewhere, I'll have a look around shortly. Hugh p.s. Immediate? Isn't that an odd name for a list of pages which are not immediately freeable? Maybe Rik's launder/laundry name would be better: pages which are currently being cleaned. -- 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>