From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 214AE21CA02; Wed, 8 Jul 2026 23:31:04 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783553466; cv=none; b=rsG87lbx+rYLP1rRXiT9lInplevsKhq0iOZCsR6op09nsSyVa5EygGhrh3pTjfayqhY9W79WNCxQVjfRvxqp+5yUYGl1NwYoJrmQgsDOwomJP2aF9n0+XYaoiR3Q+c2Wip8l17Y8BFEseUtSajFx7pBWHLw3v82LgdZK67db4wk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783553466; c=relaxed/simple; bh=tBZZacDPJqJWjaVKBQ0YpT7JDhpbuo8FOZA6wilkrHM=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=r0Rrqof/GwCltMlg6QPHM0FYgIVApS4k33+/8afJ/uevZwdUNy3APOhT/WFz6YsHfP4v7kmaaYnF+8oVvRq1bqGX2qjSNMCtDmSSN04IZ0B0cSkVg32rNYWcE6lYfgeEuR4+Yy7FfMBQgrKyJ0RV8qRNoE1jJ2QgHSRWP36ASxU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=QU0gvSwn; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="QU0gvSwn" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 836A21F00A3A; Wed, 8 Jul 2026 23:31:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1783553464; bh=vZQ5N4OBrTl0dNJ0Es2C1NPSUXJXAxYwYULRieuYpq0=; h=From:To:Cc:Subject:Date; b=QU0gvSwnpCQqvwu9kXbFkYh/FV2iYH+hsnfs3/H6ydhUAsxemry6eaUtnRNjcGktZ IbrC4c9DlPE9VQosd5BDWlUgTNeHLgiBLwhQe5ldNTxX6H7ifaYQ7bdWzfPckuh/zF RwwuTkwjFOOK96+jU9Izm2ZmaJpKxJXDVWCoDnJhepNlcvhM37ZI1HsuCCkVoLcB2M Fq3A3AQ+3iVjjMRky4CgJdc1dwa3zgSkHXaayoeIuS98d9VQg4ADOhHzq+AGkr/vJr itGIaocwUb+AleR9JFFeoJs14JLxccMCFt5SGEiG5cdvjSJJ3zlos7u2Hicoyol0TD yMRUYmRifIsNQ== From: Namhyung Kim To: Arnaldo Carvalho de Melo Cc: Ian Rogers , Jiri Olsa , Adrian Hunter , James Clark , Peter Zijlstra , Ingo Molnar , LKML , linux-perf-users@vger.kernel.org Subject: [PATCH v1 1/2] perf stat: Fix duplicate output with --for-each-cgroup Date: Wed, 8 Jul 2026 16:31:02 -0700 Message-ID: <20260708233103.1359713-1-namhyung@kernel.org> X-Mailer: git-send-email 2.55.0.795.g602f6c329a-goog Precedence: bulk X-Mailing-List: linux-perf-users@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Currently it produces following output with duplicate events when --for-each-cgroup option is used. It seems perf stat adds them when it handles default events but didn't copy some fields in evsel__clone(). $ sudo perf stat -a --for-each-cgroup / true Performance counter stats for 'system wide': 8,440,165 duration_time / 8,439,895 duration_time / 8,440,015 duration_time / 8,440,024 duration_time / 8,440,075 duration_time / 8,440,095 duration_time / 330 context-switches / # 679.4 cs/sec cs_per_second 485.69 msec cpu-clock / # 57.5 CPUs CPUs_utilized 70 cpu-migrations / # 144.1 migrations/sec migrations_per_second 71 page-faults / # 146.2 faults/sec page_faults_per_second 12,183,711 branch-misses / # 10.9 % branch_miss_rate (5.15%) 111,981,297 branches / (5.15%) 95,844,809 branches / # 197.3 M/sec branch_frequency (35.49%) 65,611,429 cpu-cycles / # 0.1 GHz cycles_frequency (98.32%) 24,170,987 cpu-cycles / (95.12%) 18,552,509 instructions / # 0.8 instructions insn_per_cycle (95.12%) 22,405,293 cpu-cycles / (64.78%) 6,840,383 stalled-cycles-frontend / # 0.31 frontend_cycles_idle (64.78%) cpu-cycles / stalled-cycles-backend / # nan backend_cycles_idle stalled-cycles-backend / # nan stalled_cycles_per_instruction instructions / stalled-cycles-frontend / 0.006546057 seconds time elapsed Some events weren't counted. Try disabling the NMI watchdog: echo 0 > /proc/sys/kernel/nmi_watchdog perf stat ... echo 1 > /proc/sys/kernel/nmi_watchdog But I'm worrying about opening same events multiple times. Probably due to grouping, but I'm not sure if it's beneficial in the end. Without duplication, it seems it won't cause multiplexing (assuming no other users at the same time). Fixes: a3248b5b5427d ("perf jevents: Add metric DefaultShowEvents") Signed-off-by: Namhyung Kim --- tools/perf/util/evsel.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c index d0484e4ee679e635..fefa5c73a474ff87 100644 --- a/tools/perf/util/evsel.c +++ b/tools/perf/util/evsel.c @@ -612,12 +612,18 @@ struct evsel *evsel__clone(struct evsel *orig) evsel->percore = orig->percore; evsel->precise_max = orig->precise_max; evsel->is_libpfm_event = orig->is_libpfm_event; + evsel->skippable = orig->skippable; + evsel->retire_lat = orig->retire_lat; + evsel->dont_regroup = orig->dont_regroup; evsel->exclude_GH = orig->exclude_GH; evsel->sample_read = orig->sample_read; evsel->collect_stat = orig->collect_stat; evsel->weak_group = orig->weak_group; evsel->use_config_name = orig->use_config_name; + evsel->default_metricgroup = orig->default_metricgroup; + evsel->default_show_events = orig->default_show_events; + evsel->pmu = orig->pmu; evsel->first_wildcard_match = orig->first_wildcard_match; -- 2.55.0.795.g602f6c329a-goog