linux-kernel - Re: [PATCH v1] perf stat: Don't display zero tool counts

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Date:   Tue, 8 Aug 2023 10:38:48 -0700
From:   Andi Kleen <ak@...ux.intel.com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Ian Rogers <irogers@...gle.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Kan Liang <kan.liang@...ux.intel.com>,
        Athira Rajeev <atrajeev@...ux.vnet.ibm.com>,
        Claire Jensen <cjense@...gle.com>,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1] perf stat: Don't display zero tool counts

On Mon, Aug 07, 2023 at 04:57:31PM -0300, Arnaldo Carvalho de Melo wrote:
> Em Mon, Aug 07, 2023 at 04:43:38PM -0300, Arnaldo Carvalho de Melo escreveu:
> > Em Mon, Aug 07, 2023 at 07:54:47AM -0700, Andi Kleen escreveu:
> > > On Thu, Aug 03, 2023 at 05:54:59PM -0300, Arnaldo Carvalho de Melo wrote:
> > > > Em Tue, Aug 01, 2023 at 01:54:52PM -0700, Ian Rogers escreveu:
> > > > > Skip zero counts for tool events.
> > > > > 
> > > > > Reported-by: Andi Kleen <ak@...ux.intel.com>
> > > > 
> > > > Andi,
> > > > 
> > > > 	Have you tested this? Can we please have your Tested-by?
> > > 
> > > I thought I had sent it earlier?
> > > 
> > > Tested-by: Andi Kleen <ak@...ux.intel.com>
> > 
> > Yeah, you did it, sorry, somehow I didn't notice.
> > 
> > Applying.
> 
> Would be good to have the original link with your report and to figure
> out the cset that introduced the problem, so that we could have a Fixes
> tag to help justifying getting this into 6.5.

Just bisected it. The original patch was below. Remarkably it had a "Fixes"
tag too)

My report was 

https://lore.kernel.org/linux-perf-users/ZMlrzcVrVi1lTDmn@tassilo/

commit b897613510890d6e92b6a276a20f6c3d96fe90e8
Author: Namhyung Kim <namhyung@...nel.org>
Date:   Tue Dec 6 09:58:04 2022 -0800

    perf stat: Update event skip condition for system-wide per-thread mode and merged uncore and hybrid events

    In print_counter_aggrdata(), it skips some events that has no aggregate
    count.  It's actually for system-wide per-thread mode and merged uncore
    and hybrid events.

    Let's update the condition to check them explicitly.

    Fixes: 91f85f98da7ab8c3 ("perf stat: Display event stats using aggr counts")