Links:
- Mini book: https://biriukov.dev/docs/page-cache
- Source code: https://github.com/brk0v/sre-page-cache-article/blob/main/lru/main.go
- Official doc of page table procfs interface: https://www.kernel.org/doc/Documentation/vm/pagemap.txt
- Official doc of idle pages tracking: https://www.kernel.org/doc/html/latest/admin-guide/mm/idle_page_tracking.html