Memory allocator

Memory Allocator Skill

Overview

Expert skill for custom memory allocator design optimized for language runtime needs.

Capabilities

• Implement bump/arena allocators
• Implement free-list allocators with size classes
• Design slab allocators for fixed-size objects
• Implement thread-local allocation buffers (TLAB)
• Handle large object allocation strategies
• Implement memory pooling and recycling
• Design memory profiling and statistics
• Implement address space layout optimization

Target Processes

• memory-allocator-design.js
• garbage-collector-implementation.js
• interpreter-implementation.js
• bytecode-vm-implementation.js

Dependencies

jemalloc, tcmalloc references

Usage Guidelines

1. Size Classes: Design size classes to minimize internal fragmentation
2. Thread Safety: Use thread-local allocation for hot paths
3. Large Objects: Handle large objects separately from small allocations
4. Profiling: Build allocation statistics from the start
5. GC Integration: Design allocator API with GC integration in mind

Output Schema

{
  "type": "object",
  "properties": {
    "allocatorType": {
      "type": "string",
      "enum": ["bump", "free-list", "slab", "hybrid"]
    },
    "sizeClasses": {
      "type": "array",
      "items": { "type": "integer" }
    },
    "threadSafety": {
      "type": "string",
      "enum": ["single-threaded", "tlab", "lock-free"]
    },
    "generatedFiles": {
      "type": "array",
      "items": { "type": "string" }
    }
  }
}