Re: [patch 0/4] [RFC] true vs. system idle cputime

[Benjamin Herrenschmidt <benh@kernel.crashing.org>]

On Wed, 2008-10-15 at 16:01 +0200, Martin Schwidefsky wrote:
> > There is one change in patch #2 that might require a change on powerpc
> > and/or ia64. The generic TICK_ONESHOT/NO_HZ code calculates the number
> > of ticks spent with a disabled HZ timer and accounts this as idle time.
> > For a configuration for VIRT_CPU_ACCOUNTING=y this is horribly wrong.
> > Either you have precise accounting or you don't. Patch #2 just removes
> > the calculation for VIRT_CPU_ACCOUNTING=y. The architectures which support
> > precise accounting have to deal with it on their own. This is where the
> > powerpc and ia64 maintainer come into play. Would you look at patch #2
> > please ?
> > 
> > To make it clearer what happens in tick_nohz_restart_sched_tick I've added
> > a new function account_idle_ticks(). And for good measure another one named
> > account_steal_ticks() for xen where "interesting" things have been done
> > with the account_steal_time interface.
> 
> Any news about powerpc? Do these patches break anything or does it work?

I didn't have a chance to look at it yet. I'll try to get that looked at
today.

Cheers,
Ben.