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The Embedded Linux Conference (ELC) is the premier vendor-neutral technical conference for companies and developers using Linux in embedded products. This conference, now in its 9th year, has the largest collection of sessions dedicated exclusively to embedded Linux and embedded Linux developers. ELC is embedded Linux experts talking about solutions to your embedded Linux problems. ELC consists of 3 days of presentations, tutorials and Bird-of-a-Feather sessions. There are over 50 sessions to choose from, on a wide variety of topics.

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Friday, February 22 • 9:00am - 9:50am
In Kernel Switcher: A Solution to Support ARM's New big.LITTLE Implementation - Mathieu Poirier, Linaro

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The 'In Kernel Switcher' (IKS) is a solution developed by Linaro and ARM to support ARM’s new big.LITTLE implementation. It is pairing together an A7 (LITTLE) and an A15 (big) processor into a logical entity that is then presented to the kernel as one CPU. From there the solution is seeking to achieve optimal performance and power consumption by switching
between the big or the LITTLE core based on system usage.

This session will present the IKS solution. After giving an overview of the big.LITTLE processor we will present the solution itself, how frequencies are masqueraded to the cpufreq core, the steps involved in doing a “switch” between cores and some of the optimisation made to the interactive governor.

The session will conclude by presenting the results that we obtained as well as a brief overview of Linaro's upstreaming plan.

Speakers

Mathieu Poirier

Linaro
Mathieu has been doing board bringup and writing low level code for Linux based products in the area of telecommunication, security, military and consumer electronics for more than 12 years. | | At Linaro he maintained Android on STE's snowball platform before joining the big.LITTLE project where he worked on performance optimisation. | | His spare time is dedicated to upstreaming Android kernel components and improving the Linux ecosystem in partnership with various community members.

Attendees (31)

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