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 X-Spam-Level: X-Spam-Status: No, score=-11.6 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 62D34C433E6 for ; Wed, 2 Sep 2020 00:45:29 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2DAAB206EF for ; Wed, 2 Sep 2020 00:45:29 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b="i/XFkyKS" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726858AbgIBAp2 (ORCPT ); Tue, 1 Sep 2020 20:45:28 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55136 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726167AbgIBAp1 (ORCPT ); Tue, 1 Sep 2020 20:45:27 -0400 Received: from mail-pf1-x442.google.com (mail-pf1-x442.google.com [IPv6:2607:f8b0:4864:20::442]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id DC685C061244 for ; Tue, 1 Sep 2020 17:45:26 -0700 (PDT) Received: by mail-pf1-x442.google.com with SMTP id d22so1855966pfn.5 for ; Tue, 01 Sep 2020 17:45:26 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=date:from:to:subject:message-id:references:mime-version :content-disposition:in-reply-to:user-agent; bh=Tt+GC81ipONMAP3soyZKTxnoUNGyjvhs1IF/WTPKOWU=; b=i/XFkyKS2TinQAHCpNSCgYsJDyGx6GF8I4MwYrPSCu+6lqshv+SLoUcBbRliDc2GY7 p5elWKnGj9zJwfHODCmBQlJJzHqtDdMSIG0sm2MOxzhS9pe3Rp8KV3adsBUJc+2ENFG6 h+Uy9a0bGlJTqHjgi5arwGqHazPKbwBIZOLnOTkuwPMe6GK/yRxyL7nRK3W1Z91NtTaV somGhAlKX/caBplwv9mdHpn/GkWBAHock8KKOh/u6FcWbF+4k+muMNV8iXprS5wUwgtC sdoiKkKlx0ioXB1bWN/xQLP9UF9DSwXxADreyktIshrYw4aO+V892Xd618AYSJcF9Wwv V7iw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:subject:message-id:references :mime-version:content-disposition:in-reply-to:user-agent; bh=Tt+GC81ipONMAP3soyZKTxnoUNGyjvhs1IF/WTPKOWU=; b=lTtmCkyXmmAw1EK6Ym0ZwssOXZ0Av/hAWi2RDnRpZdMv8/GuNvOLsgWdHNUScypQsD RcZjtOrVJtbha5N99NYTXRxpswPhzbwPjmJQS1eW2/HPGjj4IRNf4rbkboWyqIrXTiXc po5MR/R7oKG8gmDBxAG32Y0tMFRkWZaaDbxGk+dRz+tzTbMSTxMSAuivEKQON2PgIB1V 4Ctdn7QTwUIDiwrA+4vfjrxV725KrvZcDULsgJChLFAqECF100WdawMB7j005Hg3tzd6 l74cf+YzNHOwOkANvRbxVSgM0zFbrSrMPHGEsXyKIpRUhO9EMOD+6QfCTodYclR/tGRO +g1A== X-Gm-Message-State: AOAM530qDpkhqIzFWvAZkvkh0IKLtOmdzYpz6uKy+tqE3BbXa3yOaLkO JnFp+HZRaIMstk7jjoH6QWk99Q== X-Google-Smtp-Source: ABdhPJzwj3eW/QP63DTe+clV/PQXi8yqVPg4KQoaR+4UUxKWozk5LRIIyW/CZRdf6rXP6Vl1NId58A== X-Received: by 2002:a63:3103:: with SMTP id x3mr3818524pgx.80.1599007526254; Tue, 01 Sep 2020 17:45:26 -0700 (PDT) Received: from leoy-ThinkPad-X240s ([2600:3c01::f03c:91ff:fe8a:bb03]) by smtp.gmail.com with ESMTPSA id k28sm3382759pfh.196.2020.09.01.17.45.22 (version=TLS1_2 cipher=ECDHE-ECDSA-CHACHA20-POLY1305 bits=256/256); Tue, 01 Sep 2020 17:45:25 -0700 (PDT) Date: Wed, 2 Sep 2020 08:45:19 +0800 From: Leo Yan To: Arnaldo Carvalho de Melo , Suzuki K Poulose , Mathieu Poirier , Mike Leach , Peter Zijlstra , Ingo Molnar , Mark Rutland , Alexander Shishkin , Jiri Olsa , Namhyung Kim , linux-kernel@vger.kernel.org Subject: Re: [PATCH v5] perf test: Introduce script for Arm CoreSight testing Message-ID: <20200902004519.GB3306@leoy-ThinkPad-X240s> References: <20200818054927.8253-1-leo.yan@linaro.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200818054927.8253-1-leo.yan@linaro.org> User-Agent: Mutt/1.9.4 (2018-02-28) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Mathieu, On Tue, Aug 18, 2020 at 01:49:27PM +0800, Leo Yan wrote: > We need a simple method to test Perf with Arm CoreSight drivers, this > could be used for smoke testing when new patch is coming for perf or > CoreSight drivers, and we also can use the test to confirm if the > CoreSight has been enabled successfully on new platforms. Could you review this patch? Thanks! Leo > This patch introduces the shell script test_arm_coresight.sh which is > under the 'pert test' framework. This script provides three testing > scenarios: > > Test scenario 1: traverse all possible paths between source and sink > > For traversing possible paths, simply to say, the testing rationale > is source oriented testing, it traverses every source (now only refers > to ETM device) and test its all possible sinks. To search the complete > paths from one specific source to its sinks, this patch relies on the > sysfs '/sys/bus/coresight/devices/devX/out:Y' for depth-first search > (DFS) for iteration connected device nodes, if the output device is > detected as a sink device (the script will exclude TPIU device which can > not be supported for perf PMU), then it will test trace data recording > and decoding for it. > > The script runs three output testings for every trace data: > - Test branch samples dumping with 'perf script' command; > - Test branch samples reporting with 'perf report' command; > - Use option '--itrace=i1000i' to insert synthesized instructions events > and the script will check if perf can output the percentage value > successfully based on the instruction samples. > > Test scenario 2: system-wide test > > For system-wide testing, it passes option '-a' to perf tool to enable > tracing on all CPUs, so it's hard to say which program will be traced. > But perf tool itself contributes much overload in this case, so it will > parse trace data and check if process 'perf' can be detected or not. > > Test scenario 3: snapshot mode test. > > For snapshot mode testing, it uses 'dd' command to launch a long running > program, so this can give chance to send signal -USR2; it will check the > captured trace data contains 'dd' related thread info or not. > > If any test fails, it will report failure and directly exit with error. > This test will be only applied on a platform with PMU event 'cs_etm//', > otherwise will skip the testing. > > Below is detailed usage for it: > > # cd $linux/tools/perf -> This is important so can use shell script > # perf test list > [...] > 65: probe libc's inet_pton & backtrace it with ping > 66: Check Arm CoreSight trace data recording and branch samples > 67: Check open filename arg using perf trace + vfs_getname > 68: Zstd perf.data compression/decompression > 69: Add vfs_getname probe to get syscall args filenames > 70: Use vfs_getname probe to get syscall args filenames > > # perf test 66 > 66: Check Arm CoreSight trace data recording and branch samples: Ok > > Signed-off-by: Leo Yan > --- > > Changes in v5: > - Fixed testing name to system-wide testing (Suzuki); > - Used 'enable_sink' existence to check if the device is a sink (Suzuki); > - Excluded TPIU from sink devices; > - Fixed Misleading output (Suzuki); > - Removed '--per-thread' option from snapshot testing (Suzuki). > > tools/perf/tests/shell/test_arm_coresight.sh | 175 +++++++++++++++++++ > 1 file changed, 175 insertions(+) > create mode 100755 tools/perf/tests/shell/test_arm_coresight.sh > > diff --git a/tools/perf/tests/shell/test_arm_coresight.sh b/tools/perf/tests/shell/test_arm_coresight.sh > new file mode 100755 > index 000000000000..8696bb5df45a > --- /dev/null > +++ b/tools/perf/tests/shell/test_arm_coresight.sh > @@ -0,0 +1,175 @@ > +#!/bin/sh > +# Check Arm CoreSight trace data recording and branch samples > + > +# Uses the 'perf record' to record trace data with Arm CoreSight sinks; > +# then verify if there have any branch samples and instruction samples > +# are generated by CoreSight with 'perf script' and 'perf report' > +# commands. > + > +# SPDX-License-Identifier: GPL-2.0 > +# Leo Yan , 2020 > + > +perfdata=$(mktemp /tmp/__perf_test.perf.data.XXXXX) > +file=$(mktemp /tmp/temporary_file.XXXXX) > + > +skip_if_no_cs_etm_event() { > + perf list | grep -q 'cs_etm//' && return 0 > + > + # cs_etm event doesn't exist > + return 2 > +} > + > +skip_if_no_cs_etm_event || exit 2 > + > +record_touch_file() { > + echo "Recording trace (only user mode) with path: CPU$2 => $1" > + rm -f $file > + perf record -o ${perfdata} -e cs_etm/@$1/u --per-thread \ > + -- taskset -c $2 touch $file > +} > + > +perf_script_branch_samples() { > + echo "Looking at perf.data file for dumping branch samples:" > + > + # Below is an example of the branch samples dumping: > + # touch 6512 1 branches:u: ffffb220824c strcmp+0xc (/lib/aarch64-linux-gnu/ld-2.27.so) > + # touch 6512 1 branches:u: ffffb22082e0 strcmp+0xa0 (/lib/aarch64-linux-gnu/ld-2.27.so) > + # touch 6512 1 branches:u: ffffb2208320 strcmp+0xe0 (/lib/aarch64-linux-gnu/ld-2.27.so) > + perf script -F,-time -i ${perfdata} | \ > + egrep " +$1 +[0-9]+ .* +branches:([u|k]:)? +" > +} > + > +perf_report_branch_samples() { > + echo "Looking at perf.data file for reporting branch samples:" > + > + # Below is an example of the branch samples reporting: > + # 73.04% 73.04% touch libc-2.27.so [.] _dl_addr > + # 7.71% 7.71% touch libc-2.27.so [.] getenv > + # 2.59% 2.59% touch ld-2.27.so [.] strcmp > + perf report --stdio -i ${perfdata} | \ > + egrep " +[0-9]+\.[0-9]+% +[0-9]+\.[0-9]+% +$1 " > +} > + > +perf_report_instruction_samples() { > + echo "Looking at perf.data file for instruction samples:" > + > + # Below is an example of the instruction samples reporting: > + # 68.12% touch libc-2.27.so [.] _dl_addr > + # 5.80% touch libc-2.27.so [.] getenv > + # 4.35% touch ld-2.27.so [.] _dl_fixup > + perf report --itrace=i1000i --stdio -i ${perfdata} | \ > + egrep " +[0-9]+\.[0-9]+% +$1" > +} > + > +arm_cs_iterate_devices() { > + for dev in $1/connections/out\:*; do > + > + # Skip testing if it's not a directory > + ! [ -d $dev ] && continue; > + > + # Read out its symbol link file name > + path=`readlink -f $dev` > + > + # Extract device name from path, e.g. > + # path = '/sys/devices/platform/20010000.etf/tmc_etf0' > + # `> device_name = 'tmc_etf0' > + device_name=`echo $path | awk -F/ '{print $(NF)}'` > + > + > + # If the node of "enable_sink" is existed under the device path, this > + # means the device is a sink device. Need to exclude 'tpiu' since it > + # cannot support perf PMU. > + echo $device_name | egrep -q -v "tpiu" > + if [ $? -eq 0 -a -e "$path/enable_sink" ]; then > + > + pmu_dev="/sys/bus/event_source/devices/cs_etm/sinks/$device_name" > + > + # Exit if the sink device is supported by PMU or not > + if ! [ -f $pmu_dev ]; then > + echo "PMU doesn't support $pmu_dev" > + exit 1 > + fi > + > + record_touch_file $device_name $2 && > + perf_script_branch_samples touch && > + perf_report_branch_samples touch && > + perf_report_instruction_samples touch > + > + err=$? > + > + # Exit when find failure > + [ $err != 0 ] && exit $err > + > + rm -f ${perfdata} > + rm -f ${file} > + fi > + > + arm_cs_iterate_devices $dev $2 > + done > +} > + > +arm_cs_etm_traverse_path_test() { > + # Iterate for every ETM device > + for dev in /sys/bus/coresight/devices/etm*; do > + > + # Find the ETM device belonging to which CPU > + cpu=`cat $dev/cpu` > + > + echo $dev > + echo $cpu > + > + # Use depth-first search (DFS) to iterate outputs > + arm_cs_iterate_devices $dev $cpu > + done > +} > + > +arm_cs_etm_system_wide_test() { > + echo "Recording trace with system wide mode" > + perf record -o ${perfdata} -e cs_etm// -a -- ls > + > + perf_script_branch_samples perf && > + perf_report_branch_samples perf && > + perf_report_instruction_samples perf > + > + err=$? > + > + # Exit when find failure > + [ $err != 0 ] && exit $err > + > + rm -f ${perfdata} > + rm -f ${file} > +} > + > +arm_cs_etm_snapshot_test() { > + echo "Recording trace with snapshot mode" > + perf record -o ${perfdata} -e cs_etm// -S \ > + -- dd if=/dev/zero of=/dev/null & > + PERFPID=$! > + > + # Wait for perf program > + sleep 1 > + > + # Send signal to snapshot trace data > + kill -USR2 $PERFPID > + > + # Stop perf program > + kill $PERFPID > + wait $PERFPID > + > + perf_script_branch_samples dd && > + perf_report_branch_samples dd && > + perf_report_instruction_samples dd > + > + err=$? > + > + # Exit when find failure > + [ $err != 0 ] && exit $err > + > + rm -f ${perfdata} > + rm -f ${file} > +} > + > +arm_cs_etm_traverse_path_test > +arm_cs_etm_system_wide_test > +arm_cs_etm_snapshot_test > +exit 0 > -- > 2.17.1 >