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

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Introduction• DVFS• QoS• TermsIssues & SolutionsConclusion4Samsung Electronics
Linux Kernel Power ManagementLinux 3.4ThermalPM-QoSFrameworkDriverDriver (arch)CPUfreqCPUfreq DrvCPUCPUidleHotplugSoC/CPU Architecture SupportSuspendDevfreqLinux Driver ModelRuntime-PMOPPOPP SpecDevice DriverPower DomainClockSoC/CPU Architecture SupportHardwareRegulatorRegulator Drv5 • The frameworks are not hierarchical. Connections show typical Samsung usage. Electronics
Page 3: Topics Introduction DVFS (Dynamic V
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 26 and 27: DVFS Response Latency: DesignPM-QoS
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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