[PATCH 01/16] ARM: b.L: secondary kernel entry code

[Nicolas Pitre]

On Thu, 7 Mar 2013, Pavel Machek wrote:

> Hi!
> 
> > --- a/arch/arm/Kconfig
> > +++ b/arch/arm/Kconfig
> > @@ -1579,6 +1579,12 @@ config HAVE_ARM_TWD
> >  	help
> >  	  This options enables support for the ARM timer and watchdog unit
> >  
> > +config BIG_LITTLE
> > +	bool "big.LITTLE support (Experimental)"
> > +	depends on CPU_V7 && SMP && EXPERIMENTAL
> > +	help
> > +	  This option enables support for the big.LITTLE architecture.
> > +
> 
> Perhaps few lines of what big.LITTLE is would be nice here?

I'd invite you to look at the latest series posted on the list.  This 
patch is obsolete.

> It is that "few high-performance cores + few low-power cores" on chip, right?

Right.

> BTW... is it possible/good idea to run all the cores at the same time for 
> max performance? From descriptions I understood that is not normally done
> and I'd like to understand why....

It can be done.  But then the scheduler needs to be smarter about which 
task is put on which core.


Nicolas