Hi Christian, I am looking into idle page tracking and noticed the page-types tool in tools/vm/. It seems you are only marking pages as idle if the -f option is passed ("Walk file address space"). I was curious why you decided do the marking of idle pages only for files and not anonymous pages? As doing in the following code: if (opt_mark_idle && opt_file) page_idle_fd = checked_open(SYS_KERNEL_MM_PAGE_IDLE, O_RDWR); We mainly want to do idle page tracking for anonymous regions to determine howmuch of its anonymous memory is a process really using actively. But I was curious what was the reason you did it this way? thanks, - Joel