{"id":"free-list-is-lifo-stack","text":"The B-tree's free page list is a LIFO stack: `free_page` pushes onto the head and `allocate_page` pops from the head, so pages are reused in reverse order of when they were freed.","truth_value":"IN","source":"entries/2026/05/29/topic-free-list-fragmentation.md","source_url":"","source_hash":"","justifications":[],"dependents":[],"metadata":{},"created_at":"","updated_at":"","reviewed_at":"","verified_at":"","retracted_at":"","explanation":{"steps":[{"node":"free-list-is-lifo-stack","truth_value":"IN","reason":"premise"}]}}