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Re: [Qemu-devel] [RFC Design Doc]Speed up live migration by skipping fre

From: Paolo Bonzini
Subject: Re: [Qemu-devel] [RFC Design Doc]Speed up live migration by skipping free pages
Date: Thu, 24 Mar 2016 16:18:29 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.6.0

On 24/03/2016 16:16, Li, Liang Z wrote:
> > There's no guarantee that there's a single 'hole'
> > even on the PC, and we want balloon to be portable.
> As long as we know how many 'hole' and where the holes are.

The mapping between ram_addr_t and GPA is completely internal to QEMU.
Passing it to the guest is a layering violation.


> we can filter out them. QEMU should have this kind of information.
> I know my RFC patch passed an arch specific free page bitmap is not
> a good idea. So in my design, I changed this by passing a loose free page
> bitmap which contains the holes, and let QEMU to filter out the holes
> according to some arch specific information. This can make balloon be 
> portable.

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