Babysitter Memory Allocator

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

install

source · Clone the upstream repo

git clone https://github.com/a5c-ai/babysitter

Claude Code · Install into ~/.claude/skills/

T=$(mktemp -d) && git clone --depth=1 https://github.com/a5c-ai/babysitter "$T" && mkdir -p ~/.claude/skills && cp -r "$T/library/specializations/programming-languages/skills/memory-allocator" ~/.claude/skills/a5c-ai-babysitter-memory-allocator && rm -rf "$T"

manifest: library/specializations/programming-languages/skills/memory-allocator/SKILL.md

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

Size Classes: Design size classes to minimize internal fragmentation
Thread Safety: Use thread-local allocation for hot paths
Large Objects: Handle large objects separately from small allocations
Profiling: Build allocation statistics from the start
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" }
    }
  }
}