Hi :) On Wed, Sep 28, 2011 at 00:14, Prateek Sharma <prateek3.14@xxxxxxxxx> wrote: > Hello everyone, > I am trying to understand the kernel page frame reclaiming > mechanism, but one thing's bothering me: > How does the kernel 'know' which anonymous pages to evict? In the LRU > scheme, 'referenced/used' information for each page is required > (AFAIK). But anonymous pages can be used by user processes 'at any > time' without the kernel knowing about it. Same question hog my mind too so far :) The only satisfying self answer I could deduce is: kernel can't track every access to pages when you do it like e.g mov %ax,8(%esp). What kernel could track is when you access data via wrappers. I forgot which ones, but remember some of them are updating those "referenced" etc flags. Perhaps something like get_pages or alike. -- regards, Mulyadi Santosa Freelance Linux trainer and consultant blog: the-hydra.blogspot.com training: mulyaditraining.blogspot.com _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
