提升 folio 引用计数可扩展性 · v6

Google GVE driver bumps page refcount with INT_MAX ghost users instead of the usual USHRT_MAX like other drivers. This INT_MAX bump brings refcount dangerously close to an overflow. This works fine f

[mm: drop page refcount zero state semantics] Some call sites manipulate page refcount directly based on its own assumptions of the refcount int value. Instead of making such assumptions these call si

[mm: implement page refcount locking via dedicated bit] The current page refcount implementation uses a single counter value (zero) as dead. So, to prevent incrementing a dead refcount in folio_try_ge