Re: [PATCH v10 3/5] KVM: stats: Add documentation for binary statistics interface

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On Thu, Jun 17, 2021 at 01:19:50PM +0200, Paolo Bonzini wrote:
> On 17/06/21 08:07, Greg KH wrote:
> > > The statistics data itself could be read out by userspace telemetry
> > > periodically without any extra parsing or setup effort.
> > Do you have a pointer to userspace code that can do such a thing that
> > others can use?  We do not like adding apis to the kernel without at
> > least seeing the user of those apis, especially for complex things like
> > this.
> > 
> > Ideally you would include some library code in the kernel tree itself
> > that everyone can use for this for their own programs.  You have
> > provided a test which is great, but how do we know it works for "real"
> > usages?
> I am pretty sure that Google is using this internally, but we are also going
> to work on QEMU and Libvirt support for this.

We need an "external user" for something as complex as this to be able
to see if it actually works or not.  Otherwise we have to just guess :(


greg k-h

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