Optimize boot time for Karnak

[488315]

• Enable init bootcharting (bootchart start in init.rc)
• Profile boot time with atrace and bootchart for timing bottlenecks
• Analyze logcat -b all -v threadtime for slow service startups
• Parallelize service startup in init.rc via class_start split
• Move non-critical services to late_start class
• Convert blocking import and on boot calls to property-based triggers
• Reduce init.rc parse time by removing unused entries (e.g., legacy daemons)
• Enable ZRAM with tuned swappiness in init.<board>.rc
• Replace slow mounts with async vold/fs_mgr staging
• Eliminate waits from boot (e.g., fsck, time sync) by caching where possible
• Disable unnecessary SELinux audit spam (setenforce 1, use auditd or filter logs)
• Use system/core/init/stats_event_logger.cpp for boot event tagging
• Convert kernel logs to dmesg -T on device to analyze early kernel boot
• Trim rc-based startup of SurfaceFlinger/zygote—trace using systrace
• Optimize kernel command line (e.g., remove androidboot.console=tty0 if unused)
• Enable ro.zygote.disable_gl_preload=true if no GL preload needed
• Enable ro.zygote.preload.disable=true temporarily for baseline boot test
• Benchmark bootloader-to-init timing via /proc/uptime snapshot in init
• Trace HAL start delays via vintf_fragments, hwservicemanager, and servicemanager
• Stub/disable heavy HALs (e.g., biometric, camera) to measure net improvement
• Strip ro.hardware.* branches if they're loading unused modules
• Enable ro.init.updatable_crashing_process.kill=true to kill stuck services
• Build system_server with dexpreopt and enable system_server class preloading
• Set ro.dalvik.vm.native.bridge=0 to disable unused libhoudini
• Convert high-cost Java services to native where possible (defer with JobScheduler)
• Enable native bridge preoptimization (ro.dalvik.vm.native.bridge.enable=0)
• Reorder Soong modules for early boot service prioritization (e.g., libbase, liblog)
• Tune init.environ.rc to reduce PATH, strip LD_PRELOAD, reduce ENV bloat
• Disable update_engine if not used (update_engine.rc, boot control HALs)