userspace-resource-manager-extensions

8. Post-Boot Init Scripts

Directory: initscripts/post_boot/

Purpose

Post-boot scripts apply target-specific kernel and sysfs tuning at system startup, for example to configure CPU governor, RT scheduling, memory management, etc.

Script Inventory

Script Purpose
post_boot.sh Dispatcher: runs common + target-specific scripts
post_boot_qcm6490.sh QCM6490 kernel tuning
post_boot_qcs8300.sh QCS8300 kernel tuning
post_boot_qcs9075.sh QCS9075 kernel tuning
post_boot_qcs9100.sh QCS9100 kernel tuning

All scripts are installed to /etc/urm/initscripts/post_boot/ with execute permissions.

Dispatcher Script (post_boot.sh)

The dispatcher script:

  1. Runs post_boot_common.sh (if it exists and is executable).
  2. Reads /sys/devices/soc0/machine to detect the target name.
  3. Lowercases the machine name using tr.
  4. Runs post_boot_MACHINE.sh if it exists and is executable.

Target detection is fully automatic - no manual configuration needed.

Target-Specific Script Contents

All target-specific scripts (qcm6490, qcs8300, qcs9100, qcs9075) apply the target specific tuning based on machine name.

Tuning Summary Table

Setting Value Rationale
CPU governor schedutil Energy-aware; tracks actual CPU load
sched_util_clamp_min_rt_default 128 Prevents RT task throttling
mem_sleep s2idle Fast resume for embedded/always-on use
vm.swappiness 100 Aggressive swap to free RAM for workloads
vm.compaction_proactiveness 0 Disable THP compaction (THP not used)
camera-framework cgroup created Required for camera workload isolation

Adding a New Target Script

  1. Create initscripts/post_boot/post_boot_NEWTARGET.sh
  2. The dispatcher will automatically pick it up based on /sys/devices/soc0/machine
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