From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.11]) (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 C8FFB29B764; Tue, 21 Apr 2026 04:59:51 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.175.65.11 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776747593; cv=none; b=WFR62quY3oj0XCbk2oj6kfqiMZ6jNKZPAIzg0kdy6eQXsAA7NYLRY94W5kRjYdmlTZDKgmctelZEi/Um/un9neab5JkIQ391wNMxJ6j7B3EuO+cKxDZuL/mv+szR4SEo4ywrjtC4c8NNy7PSSvEzjQti2RwS8IwyuP1R7tSxL9Y= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776747593; c=relaxed/simple; bh=pMEhY5pchgg3oj5SAPs5y6BH35Qkhkz4ykk6XhyYFEE=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=cwDTTpvo3/uWOJSyZbiFA7OxMlGus2KC6p8oVK9RPO57uCHlk3zRxSmaygld/MtPkISTvwJq0Sl2bPVHaguOcElvTxYWw83P8yh+JwUnO43EwlVOHS49TPISw5S9ygks5IgCbK4TBK5wpzjfy7bRIuEFBY8LEK76U0wKoTnHt7M= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com; spf=pass smtp.mailfrom=linux.intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=dMnSVA5D; arc=none smtp.client-ip=198.175.65.11 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="dMnSVA5D" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1776747592; x=1808283592; h=from:to:cc:subject:date:message-id:mime-version: content-transfer-encoding; bh=pMEhY5pchgg3oj5SAPs5y6BH35Qkhkz4ykk6XhyYFEE=; b=dMnSVA5DHbXbgDZZr231V3PjbvEUL71f/biHQQB0nu+mUdr3/zLz2LOn xhZyp3m8vUQRSKE/uBn4Fpsai/oawGnb3TPGEdoSIkBVzbYB/vQae2xCN guj2iqOQA0dYhQ+ekfCW3CNG452AJcFw3qJQ1LIoQuNwBy/FB6tFEczrx GrNALwjB2Ny245UjMB+eeCRPEL4+VjZcOb621KYmlDMtfR/PImKQJEbAE ryCp2Am5qY0RFrEP/dCrnxNESVRRPll4o4X2NZPyoBIsp1HZUY+9SVfsB KDK3YVVo9kyKzdwIQ2kWKB+wDKLgbuzkaHZg5MIfgwxPpiMCa4s7rV5gB g==; X-CSE-ConnectionGUID: TUOnEoqRQGCfnhGN1jOX6g== X-CSE-MsgGUID: +iF9qogrR7G5A7MWfaCO1A== X-IronPort-AV: E=McAfee;i="6800,10657,11762"; a="87975698" X-IronPort-AV: E=Sophos;i="6.23,191,1770624000"; d="scan'208";a="87975698" Received: from fmviesa006.fm.intel.com ([10.60.135.146]) by orvoesa103.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 20 Apr 2026 21:59:51 -0700 X-CSE-ConnectionGUID: U+3NeBHLR0W/d0HZgACDXg== X-CSE-MsgGUID: gC0b50VkRuOKVUxqGQBcvQ== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.23,191,1770624000"; d="scan'208";a="227287215" Received: from spr.sh.intel.com ([10.112.229.196]) by fmviesa006.fm.intel.com with ESMTP; 20 Apr 2026 21:59:48 -0700 From: Dapeng Mi To: Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Namhyung Kim , Ian Rogers , Adrian Hunter , Alexander Shishkin Cc: linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org, Zide Chen , Falcon Thomas , Dapeng Mi , Xudong Hao , Dapeng Mi Subject: [Patch v3] perf tests: Add auto counter reload (ACR) sampling test Date: Tue, 21 Apr 2026 12:55:11 +0800 Message-Id: <20260421045511.2401316-1-dapeng1.mi@linux.intel.com> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Add auto counter reload sampling test to verify that the intended event records can be captured and the self-reloaded events won't generate any records. Additionally, enhance ratio_to_prev test to verify ACR sampling as well if ACR is supported. Signed-off-by: Dapeng Mi --- V3: Move ratio-to-prev ACR sampling test into ratio_to_prev test. V2: https://lore.kernel.org/all/20260420025501.2133495-1-dapeng1.mi@linux.intel.com/ v1: https://lore.kernel.org/all/20260413010920.546501-1-dapeng1.mi@linux.intel.com/ tools/perf/tests/shell/record.sh | 92 +++++++++++++++++++++++++++++++- 1 file changed, 91 insertions(+), 1 deletion(-) diff --git a/tools/perf/tests/shell/record.sh b/tools/perf/tests/shell/record.sh index 7cb81cf3444a..091d8b0a998b 100755 --- a/tools/perf/tests/shell/record.sh +++ b/tools/perf/tests/shell/record.sh @@ -402,7 +402,52 @@ test_callgraph() { echo "Callgraph test [Success]" } +test_acr_sampling() { + events="{instructions/period=40000,acr_mask=0x2/u,cycles/period=20000,acr_mask=0x3/u}" + pebs_events="{instructions/period=40000,acr_mask=0x2/pu,cycles/period=20000,acr_mask=0x3/u}" + echo "Auto counter reload (ACR) sampling test" + if ! perf record -o "${perfdata}" -e "${events}" ${testprog} 2> /dev/null + then + echo "Auto counter reload sampling [Skipped not supported]" + return + fi + if ! perf script -i "${perfdata}" -F event | grep -q "instructions" + then + echo "Auto counter reload sampling [Failed missing instructions event]" + err=1 + return + fi + if perf script -i "${perfdata}" -F event | grep -q "cycles" + then + echo "Auto counter reload sampling [Failed cycles event shouldn't be sampled]" + err=1 + return + fi + if ! perf record -o "${perfdata}" -e "${pebs_events}" ${testprog} 2> /dev/null + then + echo "Auto counter reload PEBS sampling [Skipped not supported]" + echo "Auto counter reload sampling [Success]" + return + fi + if ! perf script -i "${perfdata}" -F event | grep -q "instructions" + then + echo "Auto counter reload PEBS sampling [Failed missing instructions event]" + err=1 + return + fi + if perf script -i "${perfdata}" -F event | grep -q "cycles" + then + echo "Auto counter reload PEBS sampling [Failed cycles event shouldn't be sampled]" + err=1 + return + fi + echo "Auto counter reload sampling [Success]" +} + test_ratio_to_prev() { + ratio_events="{instructions:u,cycles/period=20000,ratio-to-prev=0.5/u}" + p_core_ratio_events="{cpu_core/instructions/u,cpu_core/cycles,period=20000,ratio-to-prev=0.5/u}" + e_core_ratio_events="{cpu_atom/instructions/u,cpu_atom/cycles,period=20000,ratio-to-prev=0.5/u}" echo "ratio-to-prev test" if ! perf record -o /dev/null -e "{instructions, cycles/period=100000,ratio-to-prev=0.5/}" \ true 2> /dev/null @@ -438,7 +483,51 @@ test_ratio_to_prev() { err=1 return fi - echo "Basic ratio-to-prev record test [Success]" + + ratio_err=0 + do_ratio_to_prev_test() { + local events=$1 + local cpu=$2 + if ! perf record -o "${perfdata}" -e "${events}" ${testprog} 2> /dev/null + then + echo "Auto counter reload ${cpu} ratio-to-prev sampling [Failed sampling]" + ratio_err=1 + return + fi + if ! perf script -i "${perfdata}" -F event | grep -q "instructions" + then + echo "Auto counter reload ${cpu} ratio-to-prev sampling [Failed missing instructions event]" + ratio_err=1 + return + fi + if perf script -i "${perfdata}" -F event | grep -q "cycles" + then + echo "Auto counter reload ${cpu} ratio-to-prev sampling [Failed cycles event shouldn't be sampled]" + ratio_err=1 + return + fi + } + + # ratio-to-prev sampling would fallback to normal sampling if ACR sampling + # is not supported, so acr_mask must be checked before testing ratio-to-prev sampling. + if [ -e /sys/bus/event_source/devices/cpu/format/acr_mask ] + then + do_ratio_to_prev_test "${ratio_events}" "" + fi + if [ -e /sys/bus/event_source/devices/cpu_core/format/acr_mask ] + then + do_ratio_to_prev_test "${p_core_ratio_events}" "P-core" + fi + if [ -e /sys/bus/event_source/devices/cpu_atom/format/acr_mask ] + then + do_ratio_to_prev_test "${e_core_ratio_events}" "E-core" + fi + if test "$ratio_err" -eq 0 + then + echo "Basic ratio-to-prev record test [Success]" + else + err="${ratio_err}" + fi } # raise the limit of file descriptors to minimum @@ -457,6 +546,7 @@ test_leader_sampling test_topdown_leader_sampling test_precise_max test_callgraph +test_acr_sampling test_ratio_to_prev # restore the default value -- 2.34.1