# Re: \[PATCH v34 0/4\] Virtio-balloon: support free page reporting

- From: David Hildenbrand \<hidden\>
- Date: 2018-06-29 15:29:04 
- List: virtualization
- Page: https://ratatoskr.run/virtualization/2018/06/5320022
- Thread: https://ratatoskr.run/kvm/2018/06/5316212/t.md

```text
>> And looking at all the discussions and problems that already happened
>> during the development of this series, I think we should rather look
>> into how clean free page hinting might solve the same problem.
> 
> I'm not sure I follow the logic. We found that neat tricks
> especially re-using the max order free page for reporting.

Let me rephrase: history of this series showed that this is some really
complicated stuff. I am asking if this complexity is actually necessary.

No question that we had a very valuable outcome so far (that especially
is also relevant for other projects like Nitesh's proposal - talking
about virtio requests and locking).

> 
>> If it can't be solved using free page hinting, fair enough.
> 
> I suspect Nitesh will need to find a way not to have mm code
> call out to random drivers or subsystems before that code
> is acceptable.
> 
> 


-- 

Thanks,

David / dhildenb
```