New Arena Range#855

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mjp41 wants to merge 23 commits into

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BackendArenaRange

Commits on Jun 12, 2026

Fix double base-adjust in FlatPagemap::get_mut<true>

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Add BackendArenaBins<B>: bin scheme, per-sc tables, and bitmap

mjp41
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Add RBTree::neighbours probe helper

mjp41
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Add BackendArena: dual-tree free-range manager with consolidation

mjp41
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Add multi-instance BackendArena tests with shared pagemap

mjp41
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BackendArena: representation-agnostic Rep concept + boundary support

mjp41
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Add BackendArenaRange and generalise BackendArena to byte units

mjp41
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Substitute LargeBuddyRange with BackendArenaRange in default range pipelines

mjp41
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Uniform sizeclass encoding for small and large allocations

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Per-chunk pagemap offset encoding

mjp41
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Fix compile-time aligned alloc/dealloc asymmetry

mjp41
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Front-end: request non-pow2 large allocations

mjp41
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BackendArena slow-path hardening

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PagemapRep: static_assert Word::Two markerless discriminator invariant

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BackendArena::unlink_block: use Bins::bin_index for classification

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Style and documentation cleanup on BackendArena

mjp41
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Add non-pow2 metadata sub-allocator: InplaceRep + SmallArenaRange

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Wire SmallArenaRange in as the LocalMetaRange

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Remove buddy allocators

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Rename BackendArena → Arena and friends

mjp41
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Round metadata to MIN_META_ALIGN, not next_pow2

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Rewrite docs/Arena.md as a docs/ companion to AddressSpace.md

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Fix CI failures across release/debug, MSVC, GCC, 32-bit and clang-format

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New Arena Range#855

New Arena Range#855
mjp41 wants to merge 23 commits into
mainfrom
BackendArenaRange

Commits on Jun 12, 2026

Fix double base-adjust in FlatPagemap::get_mut<true>

Add BackendArenaBins<B>: bin scheme, per-sc tables, and bitmap

Add RBTree::neighbours probe helper

Add BackendArena: dual-tree free-range manager with consolidation

Add multi-instance BackendArena tests with shared pagemap

BackendArena: representation-agnostic Rep concept + boundary support

Add BackendArenaRange and generalise BackendArena to byte units

Substitute LargeBuddyRange with BackendArenaRange in default range pipelines

Uniform sizeclass encoding for small and large allocations

Per-chunk pagemap offset encoding

Fix compile-time aligned alloc/dealloc asymmetry

Front-end: request non-pow2 large allocations

BackendArena slow-path hardening

PagemapRep: static_assert Word::Two markerless discriminator invariant

BackendArena::unlink_block: use Bins::bin_index for classification

Style and documentation cleanup on BackendArena

Add non-pow2 metadata sub-allocator: InplaceRep + SmallArenaRange

Wire SmallArenaRange in as the LocalMetaRange

Remove buddy allocators

Rename BackendArena → Arena and friends

Round metadata to MIN_META_ALIGN, not next_pow2

Rewrite docs/Arena.md as a docs/ companion to AddressSpace.md

Fix CI failures across release/debug, MSVC, GCC, 32-bit and clang-format