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

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Message-ID: <20250611233239.3098064-1-ctshao@google.com>
Date: Wed, 11 Jun 2025 16:32:16 -0700
From: Chun-Tse Shao <ctshao@...gle.com>
To: linux-kernel@...r.kernel.org
Cc: Chun-Tse Shao <ctshao@...gle.com>, Ian Rogers <irogers@...gle.com>, 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: [PATCH v1] perf stat: Fix uncore aggregation number

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
       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>
---
 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