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

[Sean Christopherson <seanjc@google.com>]

On Thu, Jun 30, 2022, Mingwei Zhang wrote:
> On Fri, Apr 8, 2022 at 12:52 PM Sean Christopherson <seanjc@google.com> 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...

I've no objection to adding a --verbose option or a #define of some form, but make
it opt-in, not on by default.