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Re: [Qemu-devel] [PATCH v3] Throttle-down guest when live migration does

From: Chegu Vinod
Subject: Re: [Qemu-devel] [PATCH v3] Throttle-down guest when live migration does not converge.
Date: Wed, 01 May 2013 09:34:21 -0700
User-agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:17.0) Gecko/20130328 Thunderbird/17.0.5

On 5/1/2013 8:40 AM, Paolo Bonzini wrote:
I shall make the suggested changes.
Appreciate your review feedback on this part of the change.
Hi Paolo.,

Thanks for taking a look (BTW, I accidentally left out the "RFC" in the patch subject line...my bad!).
Hi Vinod,

I think unfortunately it is not acceptable to make this patch work only
for KVM.  (It cannot work for Xen, but that's not a problem since Xen
uses a different migration mechanism; but it should work for TCG).

Ok. I hadn't yet looked at TCG aspects etc. Will follow up offline...

Unfortunately, as you noted the run_on_cpu callbacks currently run
under the big QEMU lock.  We need to fix that first.  We have time
for that during 1.6.

Ok. Was under the impression that anytime a vcpu thread enters to do anything in qemu the BQL had to be held. So choose to go with run_on_cpu() . Will follow up offline on alternatives

"Holding" the vcpus in the host context (i.e. kvm module) itself is perhaps another way. Would need some handshakes (i.e. new ioctls ) with the kernel. Would that be acceptable way to proceed?



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