Many Power Management Updates For The Linux 4.10 Kernel
Written by Michael Larabel in Hardware on 13 December 2016 at 06:46 AM EST. 21 Comments
HARDWARE --
Rafael Wysocki of Intel on Monday submitted the new ACPI and power management material for the Linux 4.10 merge window. Like most kernel cycles, there is a lot of ACPI/PM improvements on the horizon for Linux.

Some of the ACPI/PM highlights for Linux 4.10 include:

- Support for using generic CPUFreq governors in Intel P-State.

- P-State also now supports per-logical-CPU P-State limits and Energy Performance Preference / Energy Performance Bias (EPP/EPB).

- Other Intel P-State driver updates and adding new CPU ID for Knights Mill. The intel_idle driver also saw CPU IDs added for Knights Mill and Atom Z34xx hardware as did the RAPL power-capping driver.

- The CPUFreq Schedutil governor now makes use of SCHED_FIFO kernel threads for doing delayed work to lower the response latency in some cases. There are also other CPUFreq governor fixes and cleanups.

- A new CPUFreq driver for Broadcom STB SoCs along with other ARM support improvements in the CPUFreq space.

- Intel RAPL driver fixes.

- PM core fixes and clean-ups.

- Initial support for ACPI APEI (ACPI Platform Error Interface) on ARM64.

- Updated ACPICA.

More details via the ACPI and PM pull requests.
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Michael Larabel is the principal author of Phoronix.com and founded the site in 2004 with a focus on enriching the Linux hardware experience. Michael has written more than 10,000 articles covering the state of Linux hardware support, Linux performance, graphics drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated benchmarking software. He can be followed via Twitter or contacted via MichaelLarabel.com.

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