From nobody Tue Jun 16 06:04:57 2026 Received: from mail-dy1-f201.google.com (mail-dy1-f201.google.com [74.125.82.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7BB5735DA4C for ; Thu, 16 Apr 2026 20:48:33 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=74.125.82.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776372514; cv=none; b=QjN2C1omJre85wb7OtxTYL2RmWrXJdekYn2DTHIIcJyNPR0HPrqQn4CGtI1XHUipPgg74z62w8ESbLDE4Gywt3wnjLSGQdtu5wju+sS3aX6V+sIhOlKR6KpPAN8icY+WACah5HiKuY6IvlZ4O76K+uoHunMO1NfSkV7TZgWM62Q= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776372514; c=relaxed/simple; bh=gC1e89DcdJuNFWigfaSaY3MfQiaB022L2RxBjK0J4V8=; h=Date:Mime-Version:Message-ID:Subject:From:To:Cc:Content-Type; b=MEP20Jil1bOB5nfos12b8+jJmPnip/StsaHK/gtlPFR72TlR4WmXIoAPUSn6Gk5OSgGGud9B6jsftO85iRpi7pRCMfuNCSv75swcz+DVBq0xC72msi/h8iGtJISn8q4p9aVZ7CbgFFLgqi4UjCFJ5Y2Xau1Oi59RyJYt/Shli90= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--ctshao.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=WOo0YxSs; arc=none smtp.client-ip=74.125.82.201 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--ctshao.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="WOo0YxSs" Received: by mail-dy1-f201.google.com with SMTP id 5a478bee46e88-2c0ba59a830so10905022eec.0 for ; Thu, 16 Apr 2026 13:48:33 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20251104; t=1776372513; x=1776977313; darn=vger.kernel.org; h=cc:to:from:subject:message-id:mime-version:date:from:to:cc:subject :date:message-id:reply-to; bh=cRU+fJAYd/Ongu6hlAuERb26GvGNy31FbgwyiN6kgf4=; b=WOo0YxSs7ngMx1ZDGTmL7Z2xsjzrJgOY5eGXxNQiHY1SNkXnrke2pryqxVRs9UX/iR 4UkRoNLpkR8mD2XvHUva9+lAdOux9RyI1jA6ryn0FRqp1cyabaaczLEdeeMhHWILpyqM a5UPR5MfQnKXxXdP2mPKV/eSYG5HzLUGA7l42JSX9WSNr6dGYRW7D4WkYs7esz2eOMrL lvUP/6Oz0ZZXoIGNStGF6DpG50KeIXTsrXbMMMwI+Ybny5g3lLE5wsD7SnlyStLWvK0M yzEA/eX89W+aK32Kgk0n8SHT/HZ34wPEBlNNbOOaGAoPVf8uZ/fDOAv93djojPGOCamR n40g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1776372513; x=1776977313; h=cc:to:from:subject:message-id:mime-version:date:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=cRU+fJAYd/Ongu6hlAuERb26GvGNy31FbgwyiN6kgf4=; b=ZYi1owSo+Hq/I2FSUgCqV5h5izFmNdeKR88bGOsB/tq/pBrhDc4TznWikC0QfthlAD a0gPGP9KGPRnPin9DTAiEYsagJAWs7xJl0+5zKB+dar4e96BYQAgen2HP5BpPCNjeulm cBWMt9q7SeGd7vyKi47PpydNc9E5td/eTY1C+3UuK6WNyasdmATk9XJFDnJNHVAdzj7f 6lD1iuLQP1Tv9aOMzspDw/2F+i1oH/VS1oMujyrsFlsBDMG+Pavbw0Z6NYqmIq3yebQb KUPWQq3RpCX0TKeXX0mSQSi/wDTITTJtOZBu0Q9dFKL8kWSWdeHPVocPAXxEwZmpw8F3 LkgA== X-Gm-Message-State: AOJu0YynaCeYB7AE4VfNa0RuP9vzdYUU3wrH7ofqJrE2BvOk+FrFwwOG xTDZD2Uqbhiar8G3SE9KvTX7p4r5Mh/9EdED41k89atitXUKeZz/BXDBiqF+9JIGNY5QPxdgG2z 4zjX+E1PcB6sU6dMg1lx0tmW2R1dXQX3JY4Jq0lzlgI3gP+xUzRbgGp/Iy1Wy7DEA1lKEVFWJgY t9rh7Y11g/80DpVLZhh9Rhy74z/vh0NT+4/ieAMybQUK/L X-Received: from dlbpu1.prod.google.com ([2002:a05:7022:e881:b0:12c:4955:b382]) (user=ctshao job=prod-delivery.src-stubby-dispatcher) by 2002:a05:7022:4389:b0:128:c77a:6c8e with SMTP id a92af1059eb24-12c7285f074mr366497c88.28.1776372512280; Thu, 16 Apr 2026 13:48:32 -0700 (PDT) Date: Thu, 16 Apr 2026 13:48:04 -0700 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 X-Mailer: git-send-email 2.54.0.rc1.555.g9c883467ad-goog Message-ID: <20260416204828.1303734-1-ctshao@google.com> Subject: [PATCH] perf stat: Merge CPU maps when merging uncore aliases From: Chun-Tse Shao To: linux-kernel@vger.kernel.org Cc: Chun-Tse Shao , peterz@infradead.org, mingo@redhat.com, acme@kernel.org, namhyung@kernel.org, mark.rutland@arm.com, alexander.shishkin@linux.intel.com, jolsa@kernel.org, irogers@google.com, adrian.hunter@intel.com, james.clark@linaro.org, thomas.falcon@intel.com, linux-perf-users@vger.kernel.org Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Sockets with event zero counts are hidden in `perf stat --per-socket` because alias merging aggregates counts but not CPU maps. This causes the display logic to incorrectly skip sockets not present in the leader instance's map. For example, with AMD_UMC: $ cat /sys/bus/event_source/devices/amd_umc*/cpumask 0 ... 128 ... $ perf stat -e amd_umc/config=3D0xff/ --per-socket -a -- sleep 1 Performance counter stats for 'system wide': S0 12 0 amd_umc/config=3D0xff/ 1.000777829 seconds time elapsed Merge CPU maps in `evsel__merge_aggr_counters` to ensure the aggregated event correctly reflects all underlying PMU instances. After fix: $ perf stat -e amd_umc/config=3D0xff/ --per-socket -a -- sleep 1 Performance counter stats for 'system wide': S0 12 0 amd_umc/config=3D0xff/ S1 12 0 amd_umc/config=3D0xff/ 1.000666681 seconds time elapsed Signed-off-by: Chun-Tse Shao --- tools/perf/util/stat.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/tools/perf/util/stat.c b/tools/perf/util/stat.c index 14d169e22e8f..d696d217f98d 100644 --- a/tools/perf/util/stat.c +++ b/tools/perf/util/stat.c @@ -535,6 +535,12 @@ static int evsel__merge_aggr_counters(struct evsel *ev= sel, struct evsel *alias) aggr_counts_a->run +=3D aggr_counts_b->run; } =20 + /* + * Merge the CPU maps so that the display logic (e.g. should_skip_zero_co= unter) + * knows this merged event covers all CPUs from both aliases. + */ + perf_cpu_map__merge(&evsel->core.cpus, alias->core.cpus); + return 0; } =20 --=20 2.54.0.rc1.555.g9c883467ad-goog