QoS Handling with DVFS (CPUfreq & Devfreq) - The Linux Foundation

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DVFS Response Latency: DesignPM-QoSFrameworkDriverDriver (arch)QoS-aware DVFS f/wCPUCPUfreq CPUidleSuspend Devfreq Runtime-PMHotplugResponse Latency Self-awareCPUfreq DrvSoC/CPU Architecture Support Linux Driver ModelDVFS f/w (daemon)Devfreq DriverOPPDevice DriverOPP SpecPower DomainClockSoC/CPU Architecture SupportHardwareRegulatorRegulator Drv26•The frameworks are not hierarchical. Connections show typical Samsung usage. Electronics
DVFS Response Latency:(DVFS f/w) Add the following information (devfreq driver) at probe QoS-related info for Devfreq driver (/include/linux/devfreq.h) struct devfreq_dev_profile {…… /* Optional DVFS-Response-Latency QoS Handling Specification */ bool support_dvfs_latency; /* Enable the feature */ }; The Devfreq f/w will update sampling rate accordingly27Samsung Electronics
Page 3 and 4: Topics Introduction DVFS (Dynamic V
Page 5 and 6: Linux Kernel Power ManagementLinux
Page 7 and 8: Intro: DVFS 2/2 Sampling the utiliz
Page 9 and 10: Intro: Terms DVFS Target A device w
Page 11 and 12: Performance Issues of DVFS: 1/3 Iss
Page 13 and 14: Performance Issues of DVFS: 3/3 Iss
Page 15 and 16: The Possible Solution QoS handling
Page 17 and 18: QoS on DVFS Devices (DVFS f/w): Wor
Page 19 and 20: Handling QoS Requests: Design-After
Page 21 and 22: Handling QoS Requests: Status New G
Page 23 and 24: DVFS Response Latency: Motivation R
Page 29 and 30: DVFS Response Latency: Status Used
Page 31 and 32: Conclusion - Future Work 1/3 What
Page 33 and 34: Conclusion - Future Work 3/3 Future
Page 35 and 36: Appendix35Samsung Electronics

QoS Handling with DVFS (CPUfreq & Devfreq) - The Linux Foundation

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