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Re: [Xen-devel] [PATCH 2/4] CPUIDLE: Avoid remnant LAPIC timer intr whil
| To: | "Wei, Gang" <gang.wei@xxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] [PATCH 2/4] CPUIDLE: Avoid remnant LAPIC timer intr while force hpetbroadcast |
| From: | Keir Fraser <keir.fraser@xxxxxxxxxxxxx> |
| Date: | Wed, 10 Sep 2008 11:15:42 +0100 |
| Cc: | |
| Delivery-date: | Wed, 10 Sep 2008 03:16:09 -0700 |
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| Thread-topic: | [Xen-devel] [PATCH 2/4] CPUIDLE: Avoid remnant LAPIC timer intr while force hpetbroadcast |
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On 9/9/08 09:28, "Wei, Gang" <gang.wei@xxxxxxxxx> wrote: >> From above sequences, we can find this case will either introduce extra HPET >> intrs or put off the softtimer expiring. > This patch simply stops the LAPIC timer first (avoid immediate unnecessary > expiring) and raise a softirq (continue the softtimer handling process, which > will correct the LAPIC timer) when reprogram LAPIC timer fails. It's not clear to me the disable/enable_LAPIC_timer() work is worthwhile for the few timer interrupts it is likely to avoid. The other bit of the patch is a good bugfix though. I've taken just the latter part. -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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