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Re: [Qemu-devel] [PATCH v7 kernel 3/5] virtio-balloon: implementation of

From: Wang, Wei W
Subject: Re: [Qemu-devel] [PATCH v7 kernel 3/5] virtio-balloon: implementation of VIRTIO_BALLOON_F_CHUNK_TRANSFER
Date: Sun, 12 Mar 2017 01:59:54 +0000

On 03/11/2017 10:10 PM, Matthew Wilcox wrote:
> On Sat, Mar 11, 2017 at 07:59:31PM +0800, Wei Wang wrote:
> > I'm thinking what if the guest needs to transfer these much physically
> > continuous memory to host: 1GB+2MB+64KB+32KB+16KB+4KB.
> > Is it going to use Six 64-bit chunks? Would it be simpler if we just
> > use the 128-bit chunk format (we can drop the previous normal 64-bit
> > format)?
> Is that a likely thing for the guest to need to do though?  Freeing a 1GB 
> page is
> much more liikely, IMO.

Yes, I think it's very possible. The host can ask for any number of pages (e.g. 
1.5GB) that the guest can afford.  Also, the ballooned 1.5G memory is not 
guaranteed to be continuous in any pattern like 1GB+512MB. That's why we need 
to use a bitmap to draw the whole picture first, and then seek for continuous 
bits to chunk.


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