Firefox OS/Performance/Boot Sequence Optimization

Initial Ideas

Minimize data loaded by boot loader.
- Compacting vmlinuz/zImage by moving compiled-in drivers to modules.
- Minimize initial ramdisk if there is one.
- Minimize kernel cruft by excluding all unneeded drivers.
- Strip the kernel and all modules.
Minimize init launch sequence.
- Make init only launch the bare minimum for b2g process to launch.
- Ideally, init will only launch b2g.
B2G start-up sequence.
- Remove all synchronous external dependencies from B2G start-up sequence.
  - Kernel modules must be lazy loaded as needed.
  - Any sync waits on daemons must become async. Start-up b2g pieces as daemons finish launching.
  - Minimize start-up initializations.
    - Global statics need to be minimized as their constructors are run before main().
    - Global singletons must be initialized as needed.
Homescreen start-up.
- Minimize _init() code to bare minimum.
- Maybe freeze the homescreen app into a memory image that can be loaded and unfrozen instead of launching the app every time.
- Eliminate dependency on enumerating installed apps on launch.
  - Cache the list in local storage?
  - Cache the list in the frozen memory image?
  - Speed up mgmt.getAll()