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This implements Two-Level Segregated Fit (TLSF) allocator optimized for real-time scenarios: - O(1) malloc/free via bitmap-based segregated free lists - Branchless clz/ctz using mask-based shifts for RV32I compatibility - Immediate coalescing on free() to minimize fragmentation - Configurable FL_INDEX_MAX via CONFIG_TLSF_FL_INDEX_MAX - Bounds validation in block_remove/block_insert with panic on corruption - Sentinel placement validation in mo_heap_init - Block header sanity checks in free() to detect double-free Test coverage: - Block coalescing verification - Realloc in-place growth - Block splitting logic - Heap exhaustion handling - FL/SL boundary allocations - Alignment verification - Bitmap stress tests
Linmo CI Test ResultsOverall Status: ✅ passed Toolchain Results
Application Tests
Functional Test Details
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visitorckw
reviewed
Feb 3, 2026
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Would it make sense to move them to a shared header (like bitops.h)?
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This implements Two-Level Segregated Fit (TLSF) allocator optimized for real-time scenarios:
Test coverage:
Summary by cubic
Replaced the first-fit allocator with a TLSF allocator to get O(1) malloc/free, lower fragmentation, and stronger corruption checks. API stays the same; adds extensive tests and a config knob for tuning.
New Features
Migration
Written for commit 48bb991. Summary will update on new commits.