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xen-devel
Re: [Xen-devel] Re: [RFC PATCH V4 4/5] cpuidle: driver for xen
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To: |
Jeremy Fitzhardinge <jeremy@xxxxxxxx> |
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Subject: |
Re: [Xen-devel] Re: [RFC PATCH V4 4/5] cpuidle: driver for xen |
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From: |
Len Brown <lenb@xxxxxxxxxx> |
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Date: |
Thu, 31 Mar 2011 17:26:25 -0400 (EDT) |
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Cc: |
venki@xxxxxxxxxx, ak@xxxxxxxxxxxxxxx, suresh.b.siddha@xxxxxxxxx, sfr@xxxxxxxxxxxxxxxx, peterz@xxxxxxxxxxxxx, benh@xxxxxxxxxxxxxxxxxxx, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxx, arjan@xxxxxxxxxxxxxxx, Trinabh Gupta <trinabh@xxxxxxxxxxxxxxxxxx> |
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Thu, 31 Mar 2011 14:28:25 -0700 |
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Alpine 2.02 (LFD 1266 2009-07-14) |
> > >> 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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