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RE: [Xen-devel] [PATCH 1/9] Add cpu idle pwr mgmt to xen

To: "Keir Fraser" <keir.fraser@xxxxxxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx>
Subject: RE: [Xen-devel] [PATCH 1/9] Add cpu idle pwr mgmt to xen
From: "Wei, Gang" <gang.wei@xxxxxxxxx>
Date: Sat, 26 Apr 2008 17:55:49 +0800
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Thread-topic: [Xen-devel] [PATCH 1/9] Add cpu idle pwr mgmt to xen
Revised according to Keir's comments. Resubmit.


On Friday, April 25, 2008 9:01 PM, Keir Fraser wrote:
> On 25/4/08 06:07, "Wei, Gang" <gang.wei@xxxxxxxxx> wrote:
>> Add basic acpi C-states based cpu idle power mgmt in xen for x86.
>> It includes:
>>  1. hypercall definition for passing ACPI info.
>>  2. C1/C2 support.
>>  3. Mwait support, as well as legacy ioport.
>>  4. Ladder policy from Linux kernel.
>> A lot of code & ideas came from Linux.
> Comments:
>  1. In the idle loop you can just replace default_idle() with
> directly.
>  2. Do not modify common/keyhandler.c. Instead add an __initcall() in
> cpu_idle.c to register your keyhandler. The initcall function and your
> keyhandler can both be 'static' functions.
>  3. I don't like ifdef COMPAT all over new files. Define a separate
> shim file, built only for x86_64, which converts compat structures to
> native 64-bit structures. Then cpu_idle.c need know nothing about
> issues and will be cleaner for it.
>  4. Don't define placeholders for Px and Tx info in the platform
> header. They should be introduced when they are actually implemented.
> That's it. I haven't looked at the other patches yet, but you can
> make the above fixes and resubmit just this one patch without
> the others. I'll look at them after this one goes in.
>  -- Keir

Attachment: xen-1-cx_base-0426.patch
Description: xen-1-cx_base-0426.patch

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