linux-kernel - Re: [PATCH v1] perf stat: Fix uncore aggregation number

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Message-ID: <CAP-5=fXyB3H-msiSUGH_XqOntJNv-A2X7DtjvZO=nLzJgdTY+A@mail.gmail.com>
Date: Wed, 11 Jun 2025 17:16:31 -0700
From: Ian Rogers <irogers@...gle.com>
To: Chun-Tse Shao <ctshao@...gle.com>
Cc: linux-kernel@...r.kernel.org, peterz@...radead.org, mingo@...hat.com, 
	acme@...nel.org, namhyung@...nel.org, mark.rutland@....com, 
	alexander.shishkin@...ux.intel.com, jolsa@...nel.org, adrian.hunter@...el.com, 
	kan.liang@...ux.intel.com, linux-perf-users@...r.kernel.org
Subject: Re: [PATCH v1] perf stat: Fix uncore aggregation number

On Wed, Jun 11, 2025 at 4:36 PM Chun-Tse Shao <ctshao@...gle.com> wrote:
>
> Follow up:
> lore.kernel.org/CAP-5=fVDF4-qYL1Lm7efgiHk7X=_nw_nEFMBZFMcsnOOJgX4Kg@...l.gmail.com/
>
> The patch adds unit aggregation during evsel merge the aggregated uncore
> counters.
>
> Tested on a 2-socket machine with SNC3, uncore_imc_[0-11] and
> cpumask="0,120"
> Before:
>   perf stat -e clockticks -I 1000 --per-socket
>   #           time socket cpus             counts unit events
>        1.001085024 S0        1         9615386315      clockticks
>        1.001085024 S1        1         9614287448      clockticks
>   perf stat -e clockticks -I 1000 --per-node
>   #           time node   cpus             counts unit events
>        1.001029867 N0        1         3205726984      clockticks
>        1.001029867 N1        1         3205444421      clockticks
>        1.001029867 N2        1         3205234018      clockticks
>        1.001029867 N3        1         3205224660      clockticks
>        1.001029867 N4        1         3205207213      clockticks
>        1.001029867 N5        1         3205528246      clockticks
> After:
>   perf stat -e clockticks -I 1000 --per-socket
>   #           time socket cpus             counts unit events

I wonder if there is a better column heading than "cpus" given that
these are imc PMUs.

>        1.001022937 S0       12         9621463177      clockticks
>        1.001022937 S1       12         9619804949      clockticks
>   perf stat -e clockticks -I 1000 --per-node
>   #           time node   cpus             counts unit events
>        1.001029867 N0        4         3206782080      clockticks
>        1.001029867 N1        4         3207025354      clockticks
>        1.001029867 N2        4         3207067946      clockticks
>        1.001029867 N3        4         3206871733      clockticks
>        1.001029867 N4        4         3206199005      clockticks
>        1.001029867 N5        4         3205525058      clockticks
>
> Suggested-by: Ian Rogers <irogers@...gle.com>
> Signed-off-by: Chun-Tse Shao <ctshao@...gle.com>

Tested-by: Ian Rogers <irogers@...gle.com>

Thanks,
Ian

> ---
>  tools/perf/util/stat.c | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/tools/perf/util/stat.c b/tools/perf/util/stat.c
> index 355a7d5c8ab8..52266d773353 100644
> --- a/tools/perf/util/stat.c
> +++ b/tools/perf/util/stat.c
> @@ -527,6 +527,7 @@ static int evsel__merge_aggr_counters(struct evsel *evsel, struct evsel *alias)
>                 struct perf_counts_values *aggr_counts_b = &ps_b->aggr[i].counts;
>
>                 /* NB: don't increase aggr.nr for aliases */
> +               ps_a->aggr[i].nr += ps_b->aggr[i].nr;
>
>                 aggr_counts_a->val += aggr_counts_b->val;
>                 aggr_counts_a->ena += aggr_counts_b->ena;
> --
> 2.50.0.rc1.591.g9c95f17f64-goog
>