Asymmetric Multiprocessing

[John Watlington]

On Apr 30, 2012, at 9:28 AM, Peter Robinson wrote:

> On Mon, Apr 30, 2012 at 2:23 PM, John Watlington <wad at laptop.org> wrote:
>> 
>> Can someone please enlighten me as to the current state
>> of Linux and asymmetric multiprocessing ?   A number of
>> ARM SoCs on the market include both high performance
>> and low power cores.
>> 
>> Does Linux have a strategy for scheduling to these
>> asymmetric processing units yet ?
> 
> Presumable you're referring to the general cores like the Tegra3 and
> not some of the supplemental cores like on the OMAP devices for media
> processing?

I'm referring to cores running the same instruction set, but with
widely varying processing speeds (OMAP 5, Marvell PXA2128,
i.e. ARM big.LITTLE).

wad

> Support for the Tegra 3 core landed in 3.4, Linaro is
> working on the arm big.LITTLE Cortex A15/A7 support. There's a two
> phase approach to this, I thing there's a couple of articles on LWN
> about the direction they are taking.
> 
> Peter
>