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Power Management [clear filter]
Monday, September 23
 

2:00pm

SAN19-101 Thermal Governors: How to pick the right one
With higher Gigahertz and multiple cores packed in a SoC the need for thermal management for ARM based SoCs gets more and more critical. Thermal governors that define the policy for thermal management play a pivotal role in ensuring thermal safety of the device. Choosing the right one ensures the device performs optimally with in the thermal budget.

In this presentation Keerthy Jagadeesh, Co-maintainer TI BANDGAP AND THERMAL DRIVER explores the behavior of existing governors like step_wise, fair_share, bang_bang governors on A15 based DRA7 SoCs as an example. Governors perform differently based on the Number of Cores the SoC packs, the process node and the use cases. The results on DRA7 family of SoCs will be used to provide guide lines while choosing a particular thermal governor for a given SoC based on the above mentioned parameters.

Speakers
avatar for Keerthy Jagadeesh

Keerthy Jagadeesh

Software Engineer, Texas Instruments
Keerthy Jagadeesh is part of Linux core product development team of the Texas Intruments and has been an active linux contibutor for the past 8+ years. He has worked mainly on thermal management for TI SoCs, PMIC driver development, Implementing low power modes for AM437x SoCs. Currently... Read More →



Monday September 23, 2019 2:00pm - 2:25pm
Sunset IV (Session 2)
 
Wednesday, September 25
 

11:00am

Kernel Themed Discussions: CPU - Scheduler load balance rework (Dockside)
Scheduler Load Balance Rework Discussion


Speakers
avatar for Vincent Guittot

Vincent Guittot

Technical Leader, Linaro
Vincent has worked on developing drivers for various peripherals and coprocessors in mobile phones during 12 years. In 2005, he began to focus on mobile phones that ran Linux then Android and spent the last years of this period to optimize the power consumption of android platforms... Read More →


Wednesday September 25, 2019 11:00am - 11:50am
Dockside (Developer Room)

11:00am

Kernel Themed Discussions: New Topics - SD card spec update (Mission Bay)
SD card spec update



Speakers
avatar for Vincent Guittot

Vincent Guittot

Technical Leader, Linaro
Vincent has worked on developing drivers for various peripherals and coprocessors in mobile phones during 12 years. In 2005, he began to focus on mobile phones that ran Linux then Android and spent the last years of this period to optimize the power consumption of android platforms... Read More →
avatar for Ulf Hansson

Ulf Hansson

Senior Kernel Engineer, Linaro
Ulf has a very long experience of using Linux and has been contributing the Linux kernel development for many years by now. He maintains the MMC subsystem and the generic PM domain in the Linux kernel, but also spends lots of time reviewing various changes related to power management... Read More →


Wednesday September 25, 2019 11:00am - 11:50am
Mission Bay Room

12:00pm

Kernel Themed Discussions: CPU - sched_idle (follow-up of the session) (Dockside)
sched_idle (follow-up of the session)


Speakers
avatar for Vincent Guittot

Vincent Guittot

Technical Leader, Linaro
Vincent has worked on developing drivers for various peripherals and coprocessors in mobile phones during 12 years. In 2005, he began to focus on mobile phones that ran Linux then Android and spent the last years of this period to optimize the power consumption of android platforms... Read More →
avatar for Viresh Kumar

Viresh Kumar

Engineer, Linaro
Working in Linaro PMWG since 6 years now.



Wednesday September 25, 2019 12:00pm - 12:25pm
Dockside (Developer Room)

12:00pm

Kernel Themed Discussions: Devices and Testing - Thermal governor (Sunset IV- Session 2)
Thermal governor




Speakers
avatar for Vincent Guittot

Vincent Guittot

Technical Leader, Linaro
Vincent has worked on developing drivers for various peripherals and coprocessors in mobile phones during 12 years. In 2005, he began to focus on mobile phones that ran Linux then Android and spent the last years of this period to optimize the power consumption of android platforms... Read More →
avatar for Daniel Lezcano

Daniel Lezcano

Power Management Specialist, Linaro Ltd
Daniel worked in 1998 in the Space Industry and Air traffic management for distributed system project in life safety constraints. He acquired for this project a system programming expertise.He joined IBM in 2004 and since this date he does kernel hacking and pushed upstream the resource... Read More →


Wednesday September 25, 2019 12:00pm - 12:50pm
Sunset IV (Session 2)

12:30pm

Kernel Themed Discussions: CPU - Thermal capping (Dockside)
Thermal capping




Speakers
TG

Thara Gopinath

Kernel Engineer, Linaro
avatar for Vincent Guittot

Vincent Guittot

Technical Leader, Linaro
Vincent has worked on developing drivers for various peripherals and coprocessors in mobile phones during 12 years. In 2005, he began to focus on mobile phones that ran Linux then Android and spent the last years of this period to optimize the power consumption of android platforms... Read More →


Wednesday September 25, 2019 12:30pm - 12:55pm
Dockside (Developer Room)

2:00pm

Kernel Themed Discussions: Devices and Testing - Heating thermal governor (Sunset IV- Session 2)
Heating thermal governor






Speakers
TG

Thara Gopinath

Kernel Engineer, Linaro
avatar for Vincent Guittot

Vincent Guittot

Technical Leader, Linaro
Vincent has worked on developing drivers for various peripherals and coprocessors in mobile phones during 12 years. In 2005, he began to focus on mobile phones that ran Linux then Android and spent the last years of this period to optimize the power consumption of android platforms... Read More →


Wednesday September 25, 2019 2:00pm - 2:25pm
Sunset IV (Session 2)

2:00pm

Kernel Themed Discussions: CPU - Cluster idling and next step (Dockside)
Cluster idling and next step




Speakers
avatar for Ulf Hansson

Ulf Hansson

Senior Kernel Engineer, Linaro
Ulf has a very long experience of using Linux and has been contributing the Linux kernel development for many years by now. He maintains the MMC subsystem and the generic PM domain in the Linux kernel, but also spends lots of time reviewing various changes related to power management... Read More →
avatar for Vincent Guittot

Vincent Guittot

Technical Leader, Linaro
Vincent has worked on developing drivers for various peripherals and coprocessors in mobile phones during 12 years. In 2005, he began to focus on mobile phones that ran Linux then Android and spent the last years of this period to optimize the power consumption of android platforms... Read More →


Wednesday September 25, 2019 2:00pm - 2:50pm
Dockside (Developer Room)

3:00pm

Kernel Themed Discussions: CPU - Cpuidle and workload detection(Dockside)
Cpuidle and workload detection




Speakers
avatar for Daniel Lezcano

Daniel Lezcano

Power Management Specialist, Linaro Ltd
Daniel worked in 1998 in the Space Industry and Air traffic management for distributed system project in life safety constraints. He acquired for this project a system programming expertise.He joined IBM in 2004 and since this date he does kernel hacking and pushed upstream the resource... Read More →
avatar for Vincent Guittot

Vincent Guittot

Technical Leader, Linaro
Vincent has worked on developing drivers for various peripherals and coprocessors in mobile phones during 12 years. In 2005, he began to focus on mobile phones that ran Linux then Android and spent the last years of this period to optimize the power consumption of android platforms... Read More →


Wednesday September 25, 2019 3:00pm - 3:50pm
Dockside (Developer Room)

4:00pm

Kernel Themed Discussions: CPU - Suspend 2 Idle : results and learning from prototyping(Dockside)
    
Suspend 2 Idle : results and learning from prototyping




Speakers
avatar for Vincent Guittot

Vincent Guittot

Technical Leader, Linaro
Vincent has worked on developing drivers for various peripherals and coprocessors in mobile phones during 12 years. In 2005, he began to focus on mobile phones that ran Linux then Android and spent the last years of this period to optimize the power consumption of android platforms... Read More →


Wednesday September 25, 2019 4:00pm - 4:25pm
Dockside (Developer Room)

4:35pm

Kernel Themed Discussions: New Topics - BFQ i/o scheduler (Mission Bay)
BFQ i/o scheduler











Speakers
avatar for Paolo Valente

Paolo Valente

Assistant Professor, Linaro
Paolo Valente is an Assistant Professor of Computer Science at the University of Modena and Reggio Emilia, Italy, and a collaborator of the Linaro engineering organization. Paolo's main activities focus on scheduling algorithms for storage devices, transmission links and CPUs. In... Read More →
avatar for Vincent Guittot

Vincent Guittot

Technical Leader, Linaro
Vincent has worked on developing drivers for various peripherals and coprocessors in mobile phones during 12 years. In 2005, he began to focus on mobile phones that ran Linux then Android and spent the last years of this period to optimize the power consumption of android platforms... Read More →


Wednesday September 25, 2019 4:35pm - 5:00pm
Mission Bay Room
 
Thursday, September 26
 

2:00pm

SAN19-421 Training: Device power management for idle
ARM platforms often supports sophisticated power management, to for example allow unused parts on a running system, to be put into low power states, which prevents energy from being drained.

However, it can be a rather complicated task to deploy optimized power management support in a driver in the Linux kernel, especially when it comes to idle management. A couple of frameworks are there to help and these comes with corresponding callback functions, that may be assigned on per device basis. The driver developer needs detailed knowledge about these frameworks, especially when the goal is to reach the best possible energy efficient behavior.

In this session, we look into the concepts for system wide suspend and the corresponding low power states, such as suspend to ram, suspend to idle and suspend to disk.

Additionally, for more fine grained power management per device, some best practices are explained of how to deploy support for runtime PM and PM domains (in particular the generic PM domain) .

Speakers
avatar for Ulf Hansson

Ulf Hansson

Senior Kernel Engineer, Linaro
Ulf has a very long experience of using Linux and has been contributing the Linux kernel development for many years by now. He maintains the MMC subsystem and the generic PM domain in the Linux kernel, but also spends lots of time reviewing various changes related to power management... Read More →



Thursday September 26, 2019 2:00pm - 2:50pm
Sunset V (Session 1)