Re: [Qemu-devel] Rethinking missed tick catchup

[Avi Kivity]

On 09/13/2012 05:48 PM, Gleb Natapov wrote:
> On Thu, Sep 13, 2012 at 09:35:18AM -0500, Anthony Liguori wrote:
>> Gleb Natapov <address@hidden> writes:
>> 
>> > On Thu, Sep 13, 2012 at 09:06:29AM -0500, Anthony Liguori wrote:
>> >> "Daniel P. Berrange" <address@hidden> writes:
>> >> 
>> >> I think it's better for QEMU to talk to qemu-ga.  We can tell when a large
>> >> period of time has passed in QEMU because we'll accumulate a large
>> >> number of missed ticks.
>> >> 
>> > With RTC configured to use vm clock we will not.
>> 
>> Not for host suspend.  For stop and live migration, we stop vm_clock.
>> But QEMU isn't aware of host suspend so vm_clock cannot be stopped.
>> 
> Hmm, true. What about hooking into suspend and doing vmstop during
> suspend. 

There is a DBus API (UPower) with a method called AboutToSleep().  No
idea what it does or if unprivileged processes can access it.  libvirt
of qemud could do it, of course.

-- 
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