Hi, everyone
My name is Jin Huang, a graduate student interested in Linux Kernel.
Hope I ask the question in the right place.
I want to track the access activity of the pages in the LUR lists, including Anon/File active/inactive lists, the access times and stuff.
(1) I find a function very interesting and promising, void folio_mark_accessed(struct folio *folio), in mm/swap.c in linux v6.0.
Looking at the comment, seems it is used to mark the page access for the LRU algorithm.
(2) I try to use some conditions, like folio_test_lru, folio_test_anon, folio_test_active, to collect the access information for anon_[in/]activelist, file_[in/]activelist.
(3) From this experiment, I found I could not get the information I want.
Seems there are always, even I do not run any application, many many file pages access(for system) coming into folio_mark_accessed();
Even though I run some large memory-intensive application workload, the information of the anon pages I get from this function is so limited, only about 200 page access for a more than 50G memory consumption workload.I want to ask/confirm folio_mark_accessed() does not track every page access as I expect, right?
Do you have some suggestions if I want to track the LRU page access information? Especially for the application pages.
Thank You
BestJin Huang
