# power-performance

> Power management and performance optimization for Zephyr RTOS. Covers system power states (Idle, Suspend, Off), device-level power management, residency hooks, and code/data relocation for speed efficiency. Trigger when optimizing battery life, reducing latency, or managing memory constraints.

- Author: Jonathan Beri
- Repository: beriberikix/zephyr-agent-skills
- Version: 20260207093633
- Stars: 1
- Forks: 0
- Last Updated: 2026-02-07
- Source: https://github.com/beriberikix/zephyr-agent-skills
- Web: https://mule.run/skillshub/@@beriberikix/zephyr-agent-skills~power-performance:20260207093633

---

---
name: power-performance
description: Power management and performance optimization for Zephyr RTOS. Covers system power states (Idle, Suspend, Off), device-level power management, residency hooks, and code/data relocation for speed efficiency. Trigger when optimizing battery life, reducing latency, or managing memory constraints.
---

# Zephyr Power & Performance

Maximize the efficiency of your embedded system by balancing power consumption and computational performance.

## Core Workflows

### 1. Power Management (PM)
Implement system-level and peripheral-specific power saving strategies.
- **Reference**: **[power_management.md](references/power_management.md)**
- **Key Tools**: `pm_device_action_run`, `pm_state_set`, Residency hooks.

### 2. Performance Tuning
Optimize critical code paths and monitor system resources.
- **Reference**: **[performance_tuning.md](references/performance_tuning.md)**
- **Key Tools**: `CONFIG_THREAD_ANALYZER`, Linker Map, Code relocation.

### 3. Memory Optimization
Relocate code and data to utilize the fastest memory available.
- **Reference**: **[performance_tuning.md](references/performance_tuning.md#code--data-relocation)**
- **Key Tools**: `__ramfunc`, Relocation scripts.

## Quick Start (Device Suspend)
```c
#include <zephyr/pm/device.h>

const struct device *spi0 = DEVICE_DT_GET(DT_NODELABEL(spi0));

void sleep_spi(void) {
    pm_device_action_run(spi0, PM_DEVICE_ACTION_SUSPEND);
}
```

## Professional Patterns (Optimization)
- **Aggressive Suspend**: Transition peripherals to low-power states as soon as their transaction is complete.
- **ITCM/DTCM**: Use Tightly Coupled Memory for time-critical control loops to avoid Flash latency.
- **Runtime Monitoring**: Always enable the thread analyzer during development to find the "RAM floor" for your application.
- **Coordinated Sleep**: To coordinate sleep across modules, see **[Zbus](../kernel-services/references/zbus.md)** for event-driven power management.

## Resources

- **[References](references/)**:
  - `power_management.md`: System states, device PM, and hooks.
  - `performance_tuning.md`: Optimization strategies and relocation.