From nobody Fri Dec 19 12:14:46 2025 Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.18]) (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 58A071ABC33; Tue, 2 Jul 2024 22:08:09 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.175.65.18 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1719958091; cv=none; b=DLbZqa5yN59rOJ6V9TqUI9pDeGvSFhZEtWYH7E4wWOXBVQC/h9wf4TYo84Bcfh5feaI5PwjLkj4hlug/9HjJIa1zl8DtAple+nNjIclTBMBiM8WG2Qx8w+i/Lc+ccmknIZ6lqlm1/OMaV9hDkq6x78ygdaUeDZNkUYN88QmZwPo= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1719958091; c=relaxed/simple; bh=tyUd4y28OguMWyV/boph8Ima1IPUt4X/+btxrq6wjQU=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=rABIilVK1M6DM37tMDCF9YOcOJOaCfhMEVMy6LIqOC36zSKZiDzLHI8Z3lPOwyLpZ6JBc0ENvmjT+ZXEm8F9cDihKZE9Figc4IhfNRAmoEtKEl/+jGnQcASzz/lhg+FHHHIvRABOfR5dfD8oEQqBh4K2JTvLq4hNrmcKT3HaOME= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com; spf=pass smtp.mailfrom=intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=HRzVFcQD; arc=none smtp.client-ip=198.175.65.18 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="HRzVFcQD" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1719958090; x=1751494090; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=tyUd4y28OguMWyV/boph8Ima1IPUt4X/+btxrq6wjQU=; b=HRzVFcQDZtBMQfg9pD/RYeZ9qGrWLQWuhNecVf1JXCXJryztskKzUnYR fsUodVXfQyYLNmG0XYaDpp0vZt6gcfWGik8lL5amf+TlkO+/e60c06ZwI nhLOnzR2UY0kphsvdE3Fo+k+oQ0ScqR1sZ/4VnecMpyLZSAzkv9WQ6F27 5C34zSINrYInoPogCKDtvtUMvmCIuFArvLCp2tPea6AIRvkAR+/IxiA62 KichW/KPAgWDE4/F98mWgDole/pDUDIPbxhnRrllE7NJ7cpZJ4BaWSvc6 G+n6ri34Gn6+tbQy9oq1nkDkuHpOJxrDf3hQA0L5ky1TtA9tnB5qSGqGo Q==; X-CSE-ConnectionGUID: jV+A6zkDSKalmNji6OeDAg== X-CSE-MsgGUID: 9fRy0FfLTVe/0iKlqxev/g== X-IronPort-AV: E=McAfee;i="6700,10204,11121"; a="17296923" X-IronPort-AV: E=Sophos;i="6.09,180,1716274800"; d="scan'208";a="17296923" Received: from orviesa003.jf.intel.com ([10.64.159.143]) by orvoesa110.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 02 Jul 2024 15:08:05 -0700 X-CSE-ConnectionGUID: CuSeFaGITU2wlHrvk+4g5A== X-CSE-MsgGUID: i2hK5R61TtKKbhZQxhB85Q== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.09,180,1716274800"; d="scan'208";a="50888211" Received: from fl31ca102ks0602.deacluster.intel.com (HELO gnr-bkc.deacluster.intel.com) ([10.75.133.163]) by orviesa003.jf.intel.com with ESMTP; 02 Jul 2024 15:08:04 -0700 From: weilin.wang@intel.com To: weilin.wang@intel.com, Namhyung Kim , Ian Rogers , Arnaldo Carvalho de Melo , Peter Zijlstra , Ingo Molnar , Alexander Shishkin , Jiri Olsa , Adrian Hunter , Kan Liang Cc: linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org, Perry Taylor , Samantha Alt , Caleb Biggers Subject: [RFC PATCH v15 7/8] perf Document: Add TPEBS to Documents Date: Tue, 2 Jul 2024 18:07:54 -0400 Message-ID: <20240702220757.262825-8-weilin.wang@intel.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240702220757.262825-1-weilin.wang@intel.com> References: <20240702220757.262825-1-weilin.wang@intel.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable From: Weilin Wang TPEBS is a new feature Intel PMU from Granite Rapids microarchitecture. It = will be used in new TMA releases. Adding related introduction to documents while adding new code to support it in perf stat. Signed-off-by: Weilin Wang --- tools/perf/Documentation/perf-list.txt | 1 + tools/perf/Documentation/topdown.txt | 30 ++++++++++++++++++++++++++ 2 files changed, 31 insertions(+) diff --git a/tools/perf/Documentation/perf-list.txt b/tools/perf/Documentat= ion/perf-list.txt index 6bf2468f59d3..dea005410ec0 100644 --- a/tools/perf/Documentation/perf-list.txt +++ b/tools/perf/Documentation/perf-list.txt @@ -72,6 +72,7 @@ counted. The following modifiers exist: W - group is weak and will fallback to non-group if not schedulable, e - group or event are exclusive and do not share the PMU b - use BPF aggregration (see perf stat --bpf-counters) + R - retire latency value of the event =20 The 'p' modifier can be used for specifying how precise the instruction address should be. The 'p' modifier can be specified multiple times: diff --git a/tools/perf/Documentation/topdown.txt b/tools/perf/Documentatio= n/topdown.txt index ae0aee86844f..5c17fff694ee 100644 --- a/tools/perf/Documentation/topdown.txt +++ b/tools/perf/Documentation/topdown.txt @@ -325,6 +325,36 @@ other four level 2 metrics by subtracting correspondin= g metrics as below. Fetch_Bandwidth =3D Frontend_Bound - Fetch_Latency Core_Bound =3D Backend_Bound - Memory_Bound =20 +TPEBS in TopDown +=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D + +TPEBS (Timed PEBS) is one of the new Intel PMU features provided since Gra= nite +Rapids microarchitecture. The TPEBS feature adds a 16 bit retire_latency f= ield +in the Basic Info group of the PEBS record. It records the Core cycles sin= ce the +retirement of the previous instruction to the retirement of current instru= ction. +Please refer to Section 8.4.1 of "Intel=C2=AE Architecture Instruction Set= Extensions +Programming Reference" for more details about this feature. Because this f= eature +extends PEBS record, sampling with weight option is required to get the +retire_latency value. + + perf record -e event_name -W ... + +In the most recent release of TMA, the metrics begin to use event retire_l= atency +values in some of the metrics=E2=80=99 formulas on processors that support= TPEBS feature. +For previous generations that do not support TPEBS, the values are static = and +predefined per processor family by the hardware architects. Due to the div= ersity +of workloads in execution environments, retire_latency values measured at = real +time are more accurate. Therefore, new TMA metrics that use TPEBS will pro= vide +more accurate performance analysis results. + +To support TPEBS in TMA metrics, a new modifier :R on event is added. Perf= would +capture retire_latency value of required events(event with :R in metric fo= rmula) +with perf record. The retire_latency value would be used in metric calcula= tion. +Currently, this feature is supported through perf stat + + perf stat -M metric_name --record-tpebs ... + + =20 [1] https://software.intel.com/en-us/top-down-microarchitecture-analysis-m= ethod-win [2] https://sites.google.com/site/analysismethods/yasin-pubs --=20 2.43.0