On Thu, 10 Mar 2005, Rahul Iyer wrote: > Unfortunately, there is no pointer from struct page to the page table > entry (struct pte_t) using the page, probably because there may be more > than one. I then looked at rmap.h and rmap.c in 2.6.11. In those files i > saw page_referenced(...). From what i gather, this function tests and > clears the referenced flag for the given pages. Am I right? Yes. The code in rmap.c provides all the infrastructure you need to check the referenced bit on a per physical page basis. > Another question... what is ignore_token? As I saw from the source, > I couldn't get the logic behind this bit. Please read the paper referenced from mm/thrash.c ;) Unfortunately the implementation in the upstream kernel was made by me in only a day and a half, and the code needs a lot of work to run smoothly under low loads. The algorithm does seem to work very well under high loads, though ... > P.S: Are all pages that are not backed by files (mmap'd) called anonymous > pages? Yes. -- "Debugging is twice as hard as writing the code in the first place. Therefore, if you write the code as cleverly as possible, you are, by definition, not smart enough to debug it." - Brian W. Kernighan -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
