The Linaro IKS code now publicly available

Nicolas Pitre nicolas.pitre at
Wed May 1 18:33:38 UTC 2013

I'm 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

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:

Porting documentation is available here:

The switcher code description is available here (slightly out of date):

And a review of the MCPM layer upon which IKS and HMP rely:

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.


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