What does pm in linux mean?

PM in Linux is the abbreviation of "Power Management", which refers to power management. Power management plays an important role in modern computer systems. It involves power distribution, power consumption control, performance optimization, etc. In the Linux operating system, pm is mainly responsible for managing and controlling the use of power to achieve energy efficiency. Utilization and system stability.

The operating environment of this article: Linux 6.4.3 system, DELL G3 computer.

In Linux, PM is the abbreviation of Power Management, which refers to power management. Power management plays an important role in modern computer systems. It involves power distribution, power consumption control, performance optimization, etc. In the Linux operating system, PM is mainly responsible for managing and controlling power usage to achieve efficient energy utilization and system stability.

In Linux, PM can be divided into two parts: user space and kernel space. The user space PM is mainly responsible for providing graphical interfaces and command line tools for users to configure and control power management-related parameters and options. For example, users can control power usage by setting sleep time, screen brightness, etc. User space PM also provides functions such as battery status monitoring and power scheduling, so that users can understand the remaining battery capacity and system energy consumption in real time.

The kernel space PM is a subsystem in the Linux operating system, which is responsible for the actual management and control of power usage. The kernel space PM mainly interacts with the hardware through device drivers to monitor and control the power supply. It can dynamically adjust the CPU frequency, turn off useless devices, optimize the power consumption of each component, etc. according to the system load condition and user-configured policies to achieve efficient energy utilization and system performance optimization.

Kernel space PM also involves CPU energy-saving management technology, such as Power State Management (PSM). PSM allows the CPU to switch between different power consumption states to dynamically adjust based on load conditions. When the CPU is idle, it can enter a low-power state to reduce power consumption and heat dissipation. When higher performance is required, the CPU can quickly switch to a high-performance state to provide better response speed and processing capabilities.

In addition, Linux also supports the ACPI (Advanced Configuration and Power Interface) standard, which defines a unified way to manage power and configure devices. ACPI enables the system to effectively control all aspects of hardware devices through software, including power control, device status monitoring and management. This provides Linux with more flexible and intelligent power management capabilities.

In summary, PM refers to power management in Linux, including user space and kernel space PM. It is responsible for managing and controlling power usage to achieve efficient energy utilization and system stability. In Linux, PM mainly implements various power consumption adjustment and power control functions through tools and drivers in user space and kernel space to provide better user experience and system performance.

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