On Tue, 2012-05-15 at 17:43 +0200, Jan Kara wrote: > +static struct timer_list writeout_period_timer = > + TIMER_DEFERRED_INITIALIZER(writeout_period, 0, 0); So the problem with using a deferred timer is that it 'ignores' idle time. So if a very busy period is followed by a real quiet period you'd expect all the proportions to have aged to 0, but they won't have. One way to solve that is to track a jiffies count of the last time the timer triggered and compute the missed periods from that and extend fprop_new_period() to deal with period increments of more than 1. The other is of course to not use deferred timers. -- 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