Re: [PATCH v3 02/11] KVM: selftests: Dump VM stats in binary stats test

[Mingwei Zhang]

On Fri, Apr 8, 2022 at 12:52 PM Sean Christopherson <seanjc@xxxxxxxxxx> wrote:
>
> On Wed, Mar 30, 2022, Ben Gardon wrote:
> > Add kvm_util library functions to read KVM stats through the binary
> > stats interface and then dump them to stdout when running the binary
> > stats test. Subsequent commits will extend the kvm_util code and use it
> > to make assertions in a test for NX hugepages.
>
> Why?  Spamming my console with info that has zero meaning to me and is useless
> when the test passes is not helpful.  Even on failure, I don't see what the user
> is going to do with this information, all of the asserts are completly unrelated
> to the stats themselves.

Debugging could be another reason, I suspect? I remember when I tried
to use the interface, there is really no API that tells me "did I add
this stat successfully and/or correctly?" I think having a general
print so that developer/debugging folk could just 'grep mystat' to
verify that would be helpful in the future.

Otherwise, they have to write code themselves to do the dirty print...