[Top][All Lists]
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [Qemu-devel] [RFC PATCH 0/2] live backup vm
From: |
Paolo Bonzini |
Subject: |
Re: [Qemu-devel] [RFC PATCH 0/2] live backup vm |
Date: |
Wed, 12 Dec 2012 11:00:22 +0100 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/17.0 Thunderbird/17.0 |
Il 12/12/2012 10:03, Dietmar Maurer ha scritto:
>>> So our snapshot implementation uses the following steps:
>>>
>>> 1.) qmp: savevm-start [statefile]
>>>
>>> This save the VM state into [statefile] and then stops the VM.
>>
>> That's migrate exec:cat>statefile (or similar)
>
> We save to block devices, so we need to allocate them in advance
> with a size of 2 x 'memory size'.
> So we have an upper limit for the state file file, i.e. we stop the
> VM if ('statefile size' > 'assigned memory').
This is a heuristic that we can add (though remember you'll need some
extra space for the device state).
> It would be great to have some other means to reduce state size (instead
> of stopping the VM), for example by slowing down the VM somehow?
Yes, you can use the cpu cgroup.
Paolo
> Any other ideas?
>
- Re: [Qemu-devel] [RFC PATCH 0/2] live backup vm, (continued)
- Re: [Qemu-devel] [RFC PATCH 0/2] live backup vm, Wenchao Xia, 2012/12/08
- Re: [Qemu-devel] [RFC PATCH 0/2] live backup vm, Dietmar Maurer, 2012/12/09
- Re: [Qemu-devel] [RFC PATCH 0/2] live backup vm, Wenchao Xia, 2012/12/09
- Re: [Qemu-devel] [RFC PATCH 0/2] live backup vm, Dietmar Maurer, 2012/12/10
- Re: [Qemu-devel] [RFC PATCH 0/2] live backup vm, Wenchao Xia, 2012/12/11
- Re: [Qemu-devel] [RFC PATCH 0/2] live backup vm, Dietmar Maurer, 2012/12/11
- Re: [Qemu-devel] [RFC PATCH 0/2] live backup vm, Wenchao Xia, 2012/12/11
- Re: [Qemu-devel] [RFC PATCH 0/2] live backup vm, Paolo Bonzini, 2012/12/12
- Re: [Qemu-devel] [RFC PATCH 0/2] live backup vm, Dietmar Maurer, 2012/12/12
- Re: [Qemu-devel] [RFC PATCH 0/2] live backup vm, Dietmar Maurer, 2012/12/12
- Re: [Qemu-devel] [RFC PATCH 0/2] live backup vm,
Paolo Bonzini <=