Subject: Re: [v6 PATCH 0/7]: cpuidle/x86/POWER: Cleanup idle power management code in x86, cleanup drivers/cpuidle/cpuidle.c and introduce cpuidle to POWER.

From: Arun R Bharadwaj <[email-masked]>
Date: Thu, 24 Sep 2009 10:42:41 +0530

* Arun R Bharadwaj <[email-masked]> [2009-09-22 16:55:27]:

Hi Len, (or other acpi folks),

I had a question regarding ACPI-cpuidle interaction in the current
implementation.

Currently, every cpu (i.e. acpi_processor) registers to cpuidle as
a cpuidle_device. So every cpu has to go through the process of
setting up the idle states and then registering as a cpuidle device.

What exactly is the reason behind this?

Is this really necessary or can we have a system-wide one-time registering
to cpuidle by ACPI?

I'm currently in the process of enabling cpuidle for POWER systems and
find that having a system-wide registering mechanism to be a cleaner
design.

--arun