[PATCH 0/3] cpu: idle state framework for offline CPUs.

[Pavel Machek]

Hi!

> > > Also, approaches such as [1] can make use of this
> > > extended infrastructure instead of putting the CPU to an arbitrary C-state
> > > when it is offlined, thereby providing the system administrator a rope to hang
> > > himself with should he feel the need to do so.
> > I didn't see the reason why administrator needs to know which state offline cpu
> > should stay. Don't know about powerpc side, but in x86 side, it appears deepest
> > C-state is already preferred.
> 
> Yes that is what we would expect, but the deepest sleep state may be
> restricted by BIOS or other system level parameters.  This was the
> main objection to Venki's deepest sleep state for offline cpus
> patch.

'May be restricted'? Kernel already needs to know about that
restriction, just do the right thing...

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