version: "1.0.3" name: aosp-infrastructure description: | 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. metadata: author: 'utzcoz' version: '2026.06.24' last-updated: '2026-09-12'

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