Re: [RFC PATCH 3/4] virtio_balloon: add pressure notification via anew virtqueue

[Luiz Capitulino]

On Thu, 16 Jan 2014 20:38:19 -0500
Luiz Capitulino <lcapitulino@xxxxxxxxxx> wrote:

> > What does qemu do with this information?
> 
> There are two possible scenarios:
> 
>  1. The balloon driver is currently inflating when it gets under
>     pressure
> 
>     QEMU resets "num_pages" to the current balloon size. This
>     cancels the on-going inflate
> 
>  2. The balloon driver is not inflating, eg. it's possibly sleeping
> 
>    QEMU issues a deflate
> 
> But note that those scenarios are not supposed to be used with the
> current device, they are part of the automatic ballooning feature.
> I CC'ed you on the QEMU patch, you can find it here case you didn't
> see it:
> 
>  http://marc.info/?l=kvm&m=138988966315690&w=2

By "current device" I meant "outside of automatic ballooning scope".
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