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Re: [Xen-devel] [RFC] Remove the x86 Periodic 100HZ PIT TimerInterrupt

  • To: "Yu, Ke" <ke.yu@xxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx>
  • From: Keir Fraser <keir.fraser@xxxxxxxxxxxxx>
  • Date: Thu, 10 Apr 2008 11:16:21 +0100
  • Delivery-date: Thu, 10 Apr 2008 03:17:39 -0700
  • List-id: Xen developer discussion <xen-devel.lists.xensource.com>
  • Thread-index: AciYkFQNYmyqI0NSRKuabH1qVznbFQABlbckAB8ySAAADBThegBoLeBgAAPbR+M=
  • Thread-topic: [Xen-devel] [RFC] Remove the x86 Periodic 100HZ PIT TimerInterrupt

Applied as changesets 17432 and 17433. I suspect that right now the PIT will
be re-enabled after host S3 resume, so you might want to look into that.

 -- Keir

On 10/4/08 09:38, "Yu, Ke" <ke.yu@xxxxxxxxx> wrote:

> Hi Keir,
> The attached are patches for this RFC. It has been tested again
> changeset 17427. Please feel free to change the PIT handling logic.
> Best Regards
> Ke
> Keir Fraser wrote:
>> On 8/4/08 02:29, "Yu, Ke" <ke.yu@xxxxxxxxx> wrote:
>>> The logic in my mind is as follow, just want to make sure it leave
>>> enough space for you to refine PIT handling logic.
>>> 1. when xen is booting, setup PIT timer interrupt
>>> 2. if Cyclone/HPET/ACPI PM timer is clock source, setup AC timer for
>>> the overflow handling
>>> 3. if not using PIT and CPU has APIC, then disable PIT timer
>>> interrupt. 
>> This is close enough for me to tweak, so I'll be happy if you could
>> make a patch for this.
>>  Thanks,
>>  Keir

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