# Aosp Infrastructure

> AOSP Part XIII — Infrastructure. Use when reasoning about Mainline modules / APEX (Project Mainline, APEX format/manifest/signing, apexd, module catalog, SDK Extensions, module boundaries), OTA updates (A/B updates, update_engine, payload format, Virtual A/B with snapshots, rollback protection), Virtualization (Android Virtualization Framework, pKVM, crosvm, microdroid), Testing (CTS/VTS/MTS, Tradefed, Ravenwood, atest, presubmit), or Debugging (Perfetto, atrace, simpleperf, heapprofd, logcat, dumpsys). Chapters 54–56.

- Skill: `aospbooks/aosp-infrastructure` (Agent Skill)
- Install (CLI): `npx skillmds@latest add aospbooks/aosp-infrastructure`
- Raw SKILL.md: https://api.skillmd.com/api/skills/aospbooks/aosp-infrastructure/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: aospbooks (https://skillmd.com/u/aospbooks)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/aospbooks/aosp-infrastructure

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# AOSP Part XIII — Infrastructure

Cross-cutting platform infrastructure: how the platform updates itself,
how isolated workloads run, and how tests/traces/profiles work.

## Chapters in this Part

- `54-mainline-modules.md` — Project Mainline, APEX format/manifest/signing, apexd, module catalog, SDK Extensions, module boundaries
- `55-ota-updates.md` — A/B updates, update_engine, payload format, virtual A/B with snapshots, rollback protection
- `56-virtualization.md` — Android Virtualization Framework, pKVM hypervisor, crosvm, microdroid, isolated workloads
- `57-testing.md` — CTS/VTS/MTS, Tradefed, Ravenwood (host-side framework testing), atest, presubmit infrastructure
- `58-debugging-tools.md` — Perfetto trace pipeline, atrace, simpleperf, heapprofd, logcat, dumpsys conventions

## When to load which chapter

- Question mentions APEX, Mainline, apexd, SDK Extensions → `54-mainline-modules.md`
- Question mentions OTA, A/B updates, update_engine, virtual A/B, snapshot, rollback → `55-ota-updates.md`
- Question mentions AVF, pKVM, crosvm, microdroid → `56-virtualization.md`
- Question mentions CTS, VTS, MTS, Tradefed, Ravenwood, atest → `57-testing.md`
- Question mentions Perfetto, atrace, simpleperf, heapprofd, dumpsys → `58-debugging-tools.md`