zxfoundation::memory::rmap::entry Struct Reference

One reverse-map entry: identifies a single VMA slot that maps a given physical frame. More...

Collaboration diagram for zxfoundation::memory::rmap::entry:

Data Fields
entry *	next {nullptr}
vm::vm_region *	region {nullptr}
u32	slot_index {0}

Detailed Description

One reverse-map entry: identifies a single VMA slot that maps a given physical frame.

Stored in a per-PFN singly-linked intrusive list whose head lives in rmap_head (see rmap.cxxm). The link pointer is stored inside the entry itself (intrusive) so the entry can be allocated from a fixed-size pool indexed by nothing but its own address.

Lifetime:

• rmap_insert is called by the VM fault path immediately after a slot is populated with a non-empty state pointing at a shared frame (CoW, file_cache, IPC, portal).
• rmap_remove is called on slot.clear() (unmap, CoW copy, eviction, drain) before the slot is reset.
• The walker rmap_for_each_phys lets a caller invoke a function pointer on every VMA slot that currently references a given phys, enabling peer TLB shootdown on CoW and peer invalidation on reclaim.

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The documentation for this struct was generated from the following file:

• zxfoundation/memory/rmap.zcomponent/types.cxxm