Re: On guest free page hinting and OOM

Michael S. Tsirkin
2019-04-04T13:28:44Z

On Tue, Apr 02, 2019 at 04:43:03PM -0700, Alexander Duyck wrote:
> Yes, but hopefully it should be a small enough amount that nobody will
> notice. In many cases devices such as NICs can consume much more than
> this regularly for just their Rx buffers and it is not an issue. There
> has to be a certain amount of overhead that any given device is
> allowed to consume. If we contain the balloon hinting to just 64M that
> should be a small enough amount that nobody would notice in practice.

I am still inclined to add ability for balloon to exit to host on OOM
if any hints are outstanding.

If nothing else will be helpful for stats.

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MST