Andrew, This kills unnessesary ra->mmap_miss and ra->prev_pos updates on every page fault when the readahead is disabled. They fix the cache line bouncing problem in the mosbench exim benchmark, which does multi-threaded page faults on shared struct file on tmpfs. Thanks, Fengguang -- 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 internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>