Re: [PATCH v5 0/7] CSV/JSON metric thresholds, fix printf modifiers

[Namhyung Kim <namhyung@kernel.org>]

On Thu, Oct 17, 2024 at 12:15:26PM -0700, Ian Rogers wrote:
> On Thu, Oct 17, 2024 at 11:20 AM Namhyung Kim <namhyung@kernel.org> wrote:
> >
> > Hi Ian,
> >
> > On Thu, Oct 17, 2024 at 10:53:49AM -0700, Ian Rogers wrote:
> > > Metric thresholds are being computed for CSV and JSON output but not
> > > displayed. Rename the color that encodes the threshold as enum values
> > > and use to generate string constants for a json dictionary
> > > value. Disable metric thresholds with CSV output.
> > >
> > > Add printf attribute to functions in color.h that could support
> > > it. Fix bad printf format strings that this detected.
> >
> > Thanks for the quick fix, I'll take this.
> >
> > >
> > > v5. Switch some u64 printf flags to PRIx64 rather than llx (kernel
> > >     convention) to resolve 32-bit build issues.
> > > v4. Drop CSV metric thresholds due to formatting variation on
> > >     hypervisors (broken counters) and not as detected by
> > >     tests/shell/stat+csv_output.sh.
> >
> > I'm ok with dropping CSV support for now, but could you explain
> > a bit more detail about the problem?  Is it possible to see the
> > same problem on host if it has a unsupported event?
> 
> It would be. The issue is the stat-display code being a rat's nest and
> adding a column to CSV should be straightforward but causes --thread
> to behave in odd ways with an uncounted/unsupported event. Where the
> column counts differ from supported to not supported causing the CSV
> stat output check to fail. Fixing one issue leads to other issues and
> my usual desire to rewrite stat-display which can wait for another
> occasion. Here I'm trying to address that we may compute the metric
> threshold, use extra events, but then never even show the output.

I'm curious how it loos like.  Can you show me an example in both cases?

Thanks,
Namhyung