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

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Message-ID: <ZxFVYvDTtmz_JbMU@google.com>
Date: Thu, 17 Oct 2024 11:20:18 -0700
From: Namhyung Kim <namhyung@...nel.org>
To: Ian Rogers <irogers@...gle.com>
Cc: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Jiri Olsa <jolsa@...nel.org>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Kan Liang <kan.liang@...ux.intel.com>,
	John Garry <john.g.garry@...cle.com>, Will Deacon <will@...nel.org>,
	James Clark <james.clark@...aro.org>,
	Mike Leach <mike.leach@...aro.org>, Leo Yan <leo.yan@...ux.dev>,
	Yicong Yang <yangyicong@...ilicon.com>,
	Tim Chen <tim.c.chen@...ux.intel.com>,
	Thomas Richter <tmricht@...ux.ibm.com>,
	Sumanth Korikkar <sumanthk@...ux.ibm.com>,
	Weilin Wang <weilin.wang@...el.com>,
	linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 0/7] CSV/JSON metric thresholds, fix printf modifiers

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?

Thanks,
Namhyung


> v3. Rebase.
> v2. Don't display metric-value for json output if there is no unit.
> 
> Ian Rogers (7):
>   perf color: Add printf format checking and resolve issues
>   perf stat: Fix/add parameter names for print_metric
>   perf stat: Display "none" for NaN with metric only json
>   perf stat: Drop metric-unit if unit is NULL
>   perf stat: Change color to threshold in print_metric
>   perf stat: Add metric-threshold to json output
>   perf stat: Disable metric thresholds for CSV and JSON metric-only mode
> 
>  tools/perf/arch/x86/util/iostat.c             |   2 +-
>  tools/perf/builtin-sched.c                    |   2 +-
>  tools/perf/builtin-script.c                   |   6 +-
>  tools/perf/builtin-stat.c                     |   8 ++
>  tools/perf/builtin-trace.c                    |   2 +-
>  .../tests/shell/lib/perf_json_output_lint.py  |   5 +-
>  tools/perf/util/arm-spe.c                     |   2 +-
>  tools/perf/util/color.h                       |   9 +-
>  tools/perf/util/intel-bts.c                   |   2 +-
>  tools/perf/util/intel-pt.c                    |   2 +-
>  tools/perf/util/s390-cpumsf.c                 |   2 +-
>  tools/perf/util/s390-sample-raw.c             |   8 +-
>  tools/perf/util/stat-display.c                |  73 +++++++---
>  tools/perf/util/stat-shadow.c                 | 128 ++++++++++--------
>  tools/perf/util/stat.h                        |  16 ++-
>  15 files changed, 170 insertions(+), 97 deletions(-)
> 
> -- 
> 2.47.0.105.g07ac214952-goog
>