Sept. 27, 2011
5:14 p.m.
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. Am i missing something? Or does the kernel just drop some random anon pages of a process? Is there a way to obtain the 'referenced' information about anonymous pages as well? Thanks, Prateek