From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754270AbbHCPxh (ORCPT ); Mon, 3 Aug 2015 11:53:37 -0400 Received: from m12-18.163.com ([220.181.12.18]:33466 "EHLO m12-18.163.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753459AbbHCPxf convert rfc822-to-8bit (ORCPT ); Mon, 3 Aug 2015 11:53:35 -0400 Content-Type: text/plain; charset=gb2312 Mime-Version: 1.0 (1.0) Subject: Re: perf eBPF patch ordering. was: Re: perf test LLVM was: Re: [GIT PULL 00/39] perf tools: filtering events using eBPF programs From: pi3orama X-Mailer: iPhone Mail (12H143) In-Reply-To: <20150803151905.GE3864@kernel.org> Date: Mon, 3 Aug 2015 23:53:05 +0800 Cc: "Wangnan (F)" , He Kuang , Li Zefan , "ast@plumgrid.com" , "xiakaixu@huawei.com" , "linux-kernel@vger.kernel.org" , Ingo Molnar , Jiri Olsa , David Ahern , Namhyung Kim Content-Transfer-Encoding: 8BIT Message-Id: References: <20150715112015.GA3868@kernel.org> <55A869A1.505@huawei.com> <55AE2858.6040409@huawei.com> <20150721114151.GF5368@kernel.org> <55AF1EA5.5020500@huawei.com> <20150731153522.GA16700@kernel.org> <20150731203125.GB16700@kernel.org> <55BED407.9090009@huawei.com> <20150803150728.GA3864@kernel.org> <20150803151905.GE3864@kernel.org> To: Arnaldo Carvalho de Melo X-CM-TRANSID: EsCowEBpbkFhjr9V5YjtAQ--.7472S2 X-Coremail-Antispam: 1Uf129KBjvJXoWxAr17Gw43KFWrXr1fWr48WFg_yoW5GF43pr 1FkaySqr4ktrW8AwnFvw1xJrWSy3ykJr15XF9rGa13CwnF9FnrWFsIkF43ZFW5urna934I va17t348G34UAaDanT9S1TB71UUUUUUqnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDUYxBIdaVFxhVjvjDU0xZFpf9x07jUKsbUUUUU= X-Originating-IP: [210.73.4.168] X-CM-SenderInfo: lslt02xdpdqiywtou0bp/xtbBdQdLQFEANrVkfQAAsy Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 发自我的 iPhone > 在 2015年8月3日，下午11:19，Arnaldo Carvalho de Melo 写道： > > Em Mon, Aug 03, 2015 at 12:07:28PM -0300, Arnaldo Carvalho de Melo escreveu: >> Em Mon, Aug 03, 2015 at 10:37:59AM +0800, Wangnan (F) escreveu: >>> On 2015/8/1 4:31, Arnaldo Carvalho de Melo wrote: >>>> Somehow it is not calling what the changeset says it would call when passing >>>> "-e foo.o", investigating... >> >>> Have you tried >> >>> /root/bin/perf record -e ./foo.o sleep 1 >> >>> The key is './'. >> >> Nope, trying it now I get: >> >> [root@felicio ~]# perf record -e ./foo.o sleep 1 >> libbpf: failed to open ./foo.o: No such file or directory >> bpf: failed to load ./foo.o > > And with a .c suffix: > > [root@felicio ~]# perf record -e ./foo.c sleep 1 > clang-3.8: error: no such file or directory: '/root/./foo.c' > clang-3.8: error: no input files What's the content of your foo.c? Could you please have a look? I considered moving .o enabler down so when you see that patch the filter will be workable. However , like the llvm support, doing so will enable a bulk of code by one patch, that's not good. Moving .c enabler down is easy. Now I'm working on a BPF testcase. Tomorrow you will see a new test: # perf test BPF It enforces test__llvm, and forks a 'perf record' to do the filtering, then checks the result using perf report -D. The patch of the new test is a mark which indicates the basic function of BPF filter is done. What do you think about this idea? Thank you. > ERROR: unable to compile ./foo.c > Hint: Check error message shown above. > LLVM 3.7 or newer is required. Which can be found from http://llvm.org > You may want to try git trunk: > git clone http://llvm.org/git/llvm.git > and > git clone http://llvm.org/git/clang.git > > Or fetch the latest clang/llvm 3.7 from pre-built llvm packages for > debian/ubuntu: > http://llvm.org/apt > > If you are using old version of clang, change 'clang-bpf-cmd-template' > option in [llvm] section of ~/.perfconfig to: > > "$CLANG_EXEC $CLANG_OPTIONS $KERNEL_INC_OPTIONS \ > -working-directory $WORKING_DIR -c $CLANG_SOURCE \ > -emit-llvm -o - | /path/to/llc -march=bpf -filetype=obj -o -" > (Replace /path/to/llc with path to your llc) > > Hint: You can also pre-compile it into .o > invalid or unsupported event: './foo.c' > Run 'perf list' for a list of valid events > > usage: perf record [] [] > or: perf record [] -- [] > > -e, --event event selector. use 'perf list' to list available events > [root@felicio ~]# > > Now to find a hello.c BPF scriptlet... > > - Arnaldo