>> >> Sorry, I have trouble parsing this sentence, could you elaborate on "when"? > > page_referenced() indicates if a page was accessed since the previous > page_referenced() call. > > page_referenced_kstaled() indicates if a page was accessed since the > previous page_referenced_kstaled() call. > > Both of the functions need to clear PTE young bits; however we don't > want the two functions to interfere with each other. To achieve this, > we add two page bits to indicate when a young PTE has been observed by > one of the functions but not by the other. OK and this gives different page aging schemes for the same page? Is this to track state changes PR1 sees: PTE x young as 0 PR2 sees: PTE x as 1, the rest to 0 so PR1 and PR2 will disagree? Should I be looking deeper in the patches to understand Balbir -- 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>