We’re delighted to announce that the Linaro Technical Steering Committee has approved the release of the big.LITTLE in-kernel switcher (IKS) code to the public.

So here it is:

Branch big.LITTLE-IKS-snapshot of git://git.linaro.org/landing-teams/working/arm/kernel.git

Although this is a snapshot of our latest IKS code, it still needs some minor tidying before it is submitted upstream.  So please consider the above as a temporary branch for people to look and play with, and not a branch that we’ll keep stable and maintain.

This code was also developed for and tested on the VExpress TC2 development platform.  An MCPM backend and possibly a special cpufreq clock driver are required for this code to be usable on other platforms.

The switcher concept is discussed here: http://lwn.net/Articles/481055/

Porting documentation is available here: https://wiki.linaro.org/projects/big.LITTLE.MP/Big.Little.Switcher/Docs/porting-guide

The switcher code description is available here (slightly out of date): https://wiki.linaro.org/projects/big.LITTLE.MP/Big.Little.Switcher/Docs/in-kernel-code

And a review of the MCPM layer upon which IKS and HMP rely: http://lwn.net/Articles/539082/

The core MCPM patches are queued for inclusion into the v3.10 mainline kernel.  The MCPM backend for TC2 and the IKS patches will tentatively be submitted for v3.11.

Originally posted to the linaro-dev mailing list by Nicolas Pitre on Wed May 1 18:33:38 UTC 2013