Received: by 2002:a05:6a10:f347:0:0:0:0 with SMTP id d7csp3602475pxu; Tue, 15 Dec 2020 10:44:11 -0800 (PST) X-Google-Smtp-Source: ABdhPJwVXklmi7qtOz6bmQQd/3ekDlE+VeF5dspMI/tqr+QYlRMEcMRqQj62GTpr2kBMcjf84fh4 X-Received: by 2002:a17:906:a192:: with SMTP id s18mr13297505ejy.249.1608057851416; Tue, 15 Dec 2020 10:44:11 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1608057851; cv=none; d=google.com; s=arc-20160816; b=CdS96/UTHsgRtnAKPCc3QNNV34p8m1oXadPajVBgVLXgWGuv38vXMsUX/SpmejQB9H q7XbCg8F5AWe71OasUXAt6OuYMTQ9Zx/RpWA9jqB/i3pSK3Mhel2KeoqIYRLoe/IjWjj kaOhlHD457oGnLT5MFlu1/GhR9m3+g6ujuuMks+AtteHLeb74W/VaC7MFAdmCg0crLTV Ukm2arDCzLUP43q+HS98Q5N2zmcF0JrbMGllD8UP1DluUSHKdeC0VpodfVPQDfIEAad7 Vj3L/eYwKLbL4mG+sj72xcwrPeuXr8GWCevA2Su0wJamT/dm4B5ABDJeDPKQc/cWuN03 Fl2w== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:in-reply-to:content-disposition:mime-version :references:message-id:subject:cc:to:from:date:ironport-sdr :ironport-sdr; bh=mgv1GDh8QJk+/UylJQ769Za1qJEb4803okCWrmn4K9w=; b=cU0Jfca8IThQzWAG2n0SLFiy0b1Zswjsq3Vs5A7fmXDhC2kiYOSar1iNja4yLNE3F+ ts9tlYAm5+5A/eKQRnH06NQWYMUBDHmIRm8n83YYeXLej/SHRBi3GHwIZBR/Dojp2uuR Z4vX8iV4rmNmwl6vba04mJCexOW59sZxGRbsHPNGKHVhYENkWFx/N8JGvctP2UCtDoNd baKsE3DGMfibkelMaOTpyj6fQamMziA6gHHC5/ijGnJ79oEWDPFvsw/W34FrO5TGjB4t CSWCwtk3SgmPRisXVIwBynpHNu/CYai/f7GxvgRnx5Y6z9PXeBL2ZS1jvbeuy9qSQ2e2 sicw== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=intel.com Return-Path: Received: from vger.kernel.org (vger.kernel.org. [23.128.96.18]) by mx.google.com with ESMTP id jg40si1219290ejc.197.2020.12.15.10.43.47; Tue, 15 Dec 2020 10:44:11 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=intel.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731441AbgLOSlj (ORCPT + 99 others); Tue, 15 Dec 2020 13:41:39 -0500 Received: from mga17.intel.com ([192.55.52.151]:52574 "EHLO mga17.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730517AbgLOSlj (ORCPT ); Tue, 15 Dec 2020 13:41:39 -0500 IronPort-SDR: eCf5TbFDh4pOE8ld4EVKW8hfWStMXbniN/noN/Qe8L/ACoxBEChmKicZf8kYDVI0vaMKNeITbn 71bes5xRqNqQ== X-IronPort-AV: E=McAfee;i="6000,8403,9836"; a="154739041" X-IronPort-AV: E=Sophos;i="5.78,422,1599548400"; d="scan'208";a="154739041" Received: from orsmga002.jf.intel.com ([10.7.209.21]) by fmsmga107.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 15 Dec 2020 10:39:52 -0800 IronPort-SDR: WZcHuhWOoUxXCDbN+e8Bj2ffHJhRAf1F6LGhGhN1dUdzaKFB0VpJ41e9Q2eiuyhO7mZoGQIXzi pevHk8hEmZOQ== X-IronPort-AV: E=Sophos;i="5.78,422,1599548400"; d="scan'208";a="352032975" Received: from tassilo.jf.intel.com ([10.54.74.11]) by orsmga002-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 15 Dec 2020 10:39:52 -0800 Date: Tue, 15 Dec 2020 10:39:51 -0800 From: Andi Kleen To: "Paul A. Clarke" Cc: Ian Rogers , Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Mark Rutland , Alexander Shishkin , Jiri Olsa , Namhyung Kim , Alexei Starovoitov , Daniel Borkmann , Martin KaFai Lau , Song Liu , Yonghong Song , Andrii Nakryiko , John Fastabend , KP Singh , Kajol Jain , John Garry , Jin Yao , Kan Liang , Cong Wang , Kim Phillips , LKML , Networking , bpf , linux-perf-users , Stephane Eranian Subject: Re: [RFC PATCH 0/7] Share events between metrics Message-ID: <20201215183951.GB1538637@tassilo.jf.intel.com> References: <20200507081436.49071-1-irogers@google.com> <20200507174835.GB3538@tassilo.jf.intel.com> <20200507214652.GC3538@tassilo.jf.intel.com> <20201215150812.GA38786@li-24c3614c-2adc-11b2-a85c-85f334518bdb.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20201215150812.GA38786@li-24c3614c-2adc-11b2-a85c-85f334518bdb.ibm.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > Or, is the concern more about trying to time-slice the results in a > fairly granular way and expecting accurate results then? Usually the later. It's especially important for divisions. You want both divisor and dividend to be in the same time slice, otherwise the result usually doesn't make a lot of sense. -Andi