| |
|
 |
|
 |
|
|
|
| |
|
|
xen-devel
[Xen-devel] Re: [RFC PATCH V4 4/5] cpuidle: driver for xen
|
To: |
Len Brown <lenb@xxxxxxxxxx> |
|
Subject: |
[Xen-devel] Re: [RFC PATCH V4 4/5] cpuidle: driver for xen |
|
From: |
Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx> |
|
Date: |
Thu, 24 Mar 2011 08:05:22 -0400 |
|
Cc: |
venki@xxxxxxxxxx, ak@xxxxxxxxxxxxxxx, suresh.b.siddha@xxxxxxxxx, sfr@xxxxxxxxxxxxxxxx, peterz@xxxxxxxxxxxxx, benh@xxxxxxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxx, arjan@xxxxxxxxxxxxxxx, Trinabh Gupta <trinabh@xxxxxxxxxxxxxxxxxx> |
|
Delivery-date: |
Thu, 24 Mar 2011 05:06:46 -0700 |
|
Envelope-to: |
www-data@xxxxxxxxxxxxxxxxxxx |
|
In-reply-to: |
<alpine.LFD.2.02.1103231659210.12911@x980> |
|
List-help: |
<mailto:xen-devel-request@lists.xensource.com?subject=help> |
|
List-id: |
Xen developer discussion <xen-devel.lists.xensource.com> |
|
List-post: |
<mailto:xen-devel@lists.xensource.com> |
|
List-subscribe: |
<http://lists.xensource.com/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=subscribe> |
|
List-unsubscribe: |
<http://lists.xensource.com/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=unsubscribe> |
|
References: |
<20110322123208.28725.30945.stgit@xxxxxxxxxxxxxxxxxxx> <20110322123324.28725.3131.stgit@xxxxxxxxxxxxxxxxxxx> <20110322145054.GB26952@xxxxxxxxxxxx> <4D89C40B.4020809@xxxxxxxxxxxxxxxxxx> <alpine.LFD.2.02.1103231659210.12911@x980> |
|
Sender: |
xen-devel-bounces@xxxxxxxxxxxxxxxxxxx |
|
User-agent: |
Mutt/1.5.20 (2009-06-14) |
On Thu, Mar 24, 2011 at 03:18:14AM -0400, Len Brown wrote:
> Is a CONFIG_XEN kernel supposed to use just HLT in idle?
For right now..
>
> xen_arch_setup() does this:
>
> pm_idle = default_idle;
> boot_option_idle_override = IDLE_HALT;
>
> which has that effect. I guess this makes sense b/c the
> CONFIG_XEN kernel is Dom0 and the real C-sates are done
> by the hypervisor?
Correct. There are some patches that make the C-states
be visible in the Linux kernel, but that hasn't been ported
over yet.
>
> Would the same CONFIG_XEN kernel binary ever not
> run xen_arch_setup(), run on raw hardware, and want
ever not? I am not sure of the question, so let me state:
The Linux kernel if compiled with CONFIG_XEN, and if run on
native hardware, would _never_ run 'xen_arch_setup()'*. It would
run the normal, native type setup.
> to use idle states other than HLT?
>
*: It could if you really really wanted. You would need to change
the GRUB2 to inject some extra data in the 'sub_hardware' flag to be
the Xen specific.
_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel
|
|
|
| |
|
Home