linux-kernel - Re: [Xen-devel] Re: [RFC PATCH V4 4/5] cpuidle: driver for xen

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Date:	Thu, 31 Mar 2011 17:26:25 -0400 (EDT)
From:	Len Brown <lenb@...nel.org>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>, venki@...gle.com,
	ak@...ux.intel.com, suresh.b.siddha@...el.com,
	sfr@...b.auug.org.au, peterz@...radead.org,
	benh@...nel.crashing.org, linux-kernel@...r.kernel.org,
	xen-devel@...ts.xensource.com, arjan@...ux.intel.com,
	Trinabh Gupta <trinabh@...ux.vnet.ibm.com>
Subject: Re: [Xen-devel] Re: [RFC PATCH V4 4/5] cpuidle: driver for xen

> > >> xen_arch_setup() does this:
> > >>
> > >>         pm_idle = default_idle;
> > >>         boot_option_idle_override = IDLE_HALT;

What happens on a Xen kernel if these lines are not there?
Does Xen export the C-states tables to Dom0 kernel, and the Dom0
kernel has an acpi processor driver, and thus it would try to
use all the C-states?

If yes, must Xen show those tables to Dom?
If it did not, then the lines above would not be necessary,
as in the absence of any C-states, the kernel should
use halt by default.

thanks,
-Len Brown, Intel Open Source Technology Center

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