> +static unsigned long ra_stats[RA_PATTERN_MAX][RA_ACCOUNT_MAX]; Why not make it per cpu? That should get the overhead down, probably even enough that it can be enabled by default. BTW I have an older framework to make it really easy to add per cpu stats counters to debugfs. Will repost, that would simplify it even more. -Andi -- 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>