From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id DED0FC77B73 for ; Wed, 19 Apr 2023 17:43:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229758AbjDSRnV (ORCPT ); Wed, 19 Apr 2023 13:43:21 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44808 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229739AbjDSRnS (ORCPT ); Wed, 19 Apr 2023 13:43:18 -0400 Received: from mail-wm1-x32a.google.com (mail-wm1-x32a.google.com [IPv6:2a00:1450:4864:20::32a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C397F72A0 for ; Wed, 19 Apr 2023 10:43:16 -0700 (PDT) Received: by mail-wm1-x32a.google.com with SMTP id 5b1f17b1804b1-3f048b144eeso147985e9.1 for ; Wed, 19 Apr 2023 10:43:16 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20221208; t=1681926195; x=1684518195; h=content-transfer-encoding:cc:to:subject:message-id:date:from :in-reply-to:references:mime-version:from:to:cc:subject:date :message-id:reply-to; bh=LbIeXSReCQMbeb4ih3GQD4yHVI+ajegh0q6OiBbZIxg=; b=LHTaEdOyIBlJsLLfw3G2QpQk9naWCaRk8oWpTNM0nZZIFvxvmevcqE+gjM3vs8Z2K1 W1/HmoG0GqrXpeu7HU4/kVSdSuIC/t20E0hmzPxn6WMRZZQJJT9iiCM2GtzumIUp4not A/dcKgPcYslPWtn2WW1dtqXLgWCYpMms6B975bbHGb5DeRjzAr2LuDtkz7HJxUomtpME VRvxUAxvB2QKGXpVagWuNojmw1PV2Ezvd6bvJp27ClTT1V9Leh50cY+ZYSQ+HQAEKD36 kYK1SY8TPmFQuJ6BPtefi+ZeHkknOvp5/pFlQ6pW+AzeOfRl5c1IvxophtdEkpqrcV1I zR1A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1681926195; x=1684518195; h=content-transfer-encoding:cc:to:subject:message-id:date:from :in-reply-to:references:mime-version:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=LbIeXSReCQMbeb4ih3GQD4yHVI+ajegh0q6OiBbZIxg=; b=EFyhvKJP/1Gn0ubLvAw/WfRBwvRfa3Ry8TnkwiqpktuKm91AfEgbK7ADBJo3+iO6+V 2jaqyeSr7di5qgiOv0OilqJQFjZ2JScf6A4S74t6dqjChY90WW+1hJn6E4KOmiQnYw13 CmoRkT1M7OmNfA2h4ZAhtmPm/DXk+JWSCGDF9mQg9gNNUKl2uOSgyTt4BZgqEU5BNZTs mfLboGWjCYJp6DJjV3k+oeB8YynvKRVRVYRkFYsra8j7PRFnpICdq4azFWYvA1acXK1Z owo0b0gbUYReNtBaqVhS5fB0G6/Em0WDP5uAuxYOfVklXu2qS227fRFHxzQuwkMZCv1e hY4g== X-Gm-Message-State: AAQBX9dUoHyW1DfU/1xSVB1tMkU8lOH5HglK0VPIhVhEYejKTAiqu551 Iqep9VvuZsr+QE/OJzcoFjvd4weHP2hEY4awYYh5Yg== X-Google-Smtp-Source: AKy350ZmpzQ1uY1BUEeMEpoys5h/UnF5v4KOvTi+J/OoxZA1ul+8Bb2MgOls4JOxVXqW2oCoz86I5D2zEW2FeB5MdWA= X-Received: by 2002:a05:600c:4e8a:b0:3f1:73b8:b5fe with SMTP id f10-20020a05600c4e8a00b003f173b8b5femr4192wmq.3.1681926195026; Wed, 19 Apr 2023 10:43:15 -0700 (PDT) MIME-Version: 1.0 References: <20230413161725.195417-1-alexghiti@rivosinc.com> In-Reply-To: From: Ian Rogers Date: Wed, 19 Apr 2023 10:42:58 -0700 Message-ID: Subject: Re: [PATCH 0/4] riscv: Allow userspace to directly access perf counters To: Alexandre Ghiti , paranlee Cc: Atish Patra , David Laight , Jonathan Corbet , Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Mark Rutland , Alexander Shishkin , Jiri Olsa , Namhyung Kim , Paul Walmsley , Palmer Dabbelt , Albert Ou , Anup Patel , Will Deacon , Rob Herring , "linux-doc@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "linux-perf-users@vger.kernel.org" , "linux-riscv@lists.infradead.org" , "linux-arm-kernel@lists.infradead.org" Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Apr 19, 2023 at 2:21=E2=80=AFAM Alexandre Ghiti wrote: > > Hi Ian, > > On Tue, Apr 18, 2023 at 10:30=E2=80=AFPM Atish Patra wrote: > > > > On Tue, Apr 18, 2023 at 11:46=E2=80=AFPM Ian Rogers wrote: > > > > > > On Tue, Apr 18, 2023 at 9:43=E2=80=AFAM Atish Patra wrote: > > > > > > > > On Fri, Apr 14, 2023 at 2:40=E2=80=AFAM David Laight wrote: > > > > > > > > > > From: Atish Patra > > > > > > Sent: 13 April 2023 20:18 > > > > > > > > > > > > On Thu, Apr 13, 2023 at 9:47=E2=80=AFPM Alexandre Ghiti wrote: > > > > > > > > > > > > > > riscv used to allow direct access to cycle/time/instret count= ers, > > > > > > > bypassing the perf framework, this patchset intends to allow = the user to > > > > > > > mmap any counter when accessed through perf. But we can't bre= ak the > > > > > > > existing behaviour so we introduce a sysctl perf_user_access = like arm64 > > > > > > > does, which defaults to the legacy mode described above. > > > > > > > > > > > > > > > > > > > It would be good provide additional direction for user space pa= ckages: > > > > > > > > > > > > The legacy behavior is supported for now in order to avoid brea= king > > > > > > existing software. > > > > > > However, reading counters directly without perf interaction may > > > > > > provide incorrect values which > > > > > > the userspace software must avoid. We are hoping that the user = space > > > > > > packages which > > > > > > read the cycle/instret directly, will move to the proper interf= ace > > > > > > eventually if they actually need it. > > > > > > Most of the users are supposed to read "time" instead of "cycle= " if > > > > > > they intend to read timestamps. > > > > > > > > > > If you are trying to measure the performance of short code > > > > > fragments then you need pretty much raw access directly to > > > > > the cycle/clock count register. > > > > > > > > > > I've done this on x86 to compare the actual cycle times > > > > > of different implementations of the IP checksum loop > > > > > (and compare them to the theoretical limit). > > > > > The perf framework just added far too much latency, > > > > > only directly reading the cpu registers gave anything > > > > > like reliable (and consistent) answers. > > > > > > > > > > > > > This series allows direct access to the counters once configured > > > > through the perf. > > > > Earlier the cycle/instret counters are directly exposed to the > > > > userspace without kernel/perf frameworking knowing > > > > when/which user space application is reading it. That has security = implications. > > > > > > > > With this series applied, the user space application just needs to > > > > configure the event (cycle/instret) through perf syscall. > > > > Once configured, the userspace application can find out the counter > > > > information from the mmap & directly > > > > read the counter. There is no latency while reading the counters. > > > > > > > > This mechanism allows stop/clear the counters when the requesting t= ask > > > > is not running. It also takes care of context switching > > > > which may result in invalid values as you mentioned below. This is > > > > nothing new and all other arch (x86, ARM64) allow user space > > > > counter read through the same mechanism. > > > > > > > > Here is the relevant upstream discussion: > > > > https://lore.kernel.org/lkml/Y7wLa7I2hlz3rKw%2F@hirez.programming.k= icks-ass.net/T/ > > > > > > > > ARM64: > > > > https://docs.kernel.org/arm64/perf.html?highlight=3Dperf_user_acces= s#perf-userspace-pmu-hardware-counter-access > > > > > > > > example usage in x86: > > > > https://github.com/andikleen/pmu-tools/blob/master/jevents/rdpmc.c > > > > > > The canonical implementation of this should be: > > > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tr= ee/tools/lib/perf/mmap.c#n400 > > > > Thanks for sharing the libperf implementation. > > > > > which is updated in these patches but the tests are not: > > > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tr= ee/tools/perf/tests/mmap-basic.c#n287 > > > Which appears to be an oversight. The tests display some differences > > > > Yes. It's an oversight. We should make sure that perf mmap tests pass > > for RISC-V as well. > > Yes, that's an oversight, I had a local test adapted from this one but > forgot to update it afterwards, I'll do that in the next version. > > Thanks for your quick feedbacks and sorry for being late, > > Alex Thanks Alex, there was an equally likely chance that I wasn't understanding things :-) Is there any information on RISC-V PMU testing? I know ParanLee is interested. It'd be awesome to have something say on: https://perf.wiki.kernel.org/index.php/Main_Page on how to run tests, perhaps on QEMU or known to work boards. We can also just drop a link on there if there is information. We can also add the RISC-V PMU information to the links here: https://perf.wiki.kernel.org/index.php/Useful_Links Thanks, Ian > > > > > > > > between x86 and aarch64 that have assumed userspace hardware counter > > > access, and everything else that it is assumed don't. > > > > > > Thanks, > > > Ian > > > > > > > > Clearly process switches (especially cpu migrations) cause > > > > > problems, but they are obviously invalid values and can > > > > > be ignored. > > > > > > > > > > So while a lot of uses may be 'happy' with the values the > > > > > perf framework gives, sometimes you do need to directly > > > > > read the relevant registers. > > > > > > > > > > David > > > > > > > > > > - > > > > > Registered Address Lakeside, Bramley Road, Mount Farm, Milton Key= nes, MK1 1PT, UK > > > > > Registration No: 1397386 (Wales) > > > > > > > > > > > > > > > > -- > > > > Regards, > > > > Atish > > > > > > > > -- > > Regards, > > Atish From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: 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Corbet , Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Mark Rutland , Alexander Shishkin , Jiri Olsa , Namhyung Kim , Paul Walmsley , Palmer Dabbelt , Albert Ou , Anup Patel , Will Deacon , Rob Herring , "linux-doc@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "linux-perf-users@vger.kernel.org" , "linux-riscv@lists.infradead.org" , "linux-arm-kernel@lists.infradead.org" X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230419_104318_372849_8EFCCEDE X-CRM114-Status: GOOD ( 50.44 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org T24gV2VkLCBBcHIgMTksIDIwMjMgYXQgMjoyMeKAr0FNIEFsZXhhbmRyZSBHaGl0aSA8YWxleGdo 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