From mboxrd@z Thu Jan 1 00:00:00 1970 From: Thomas Richter Subject: Re: [PATCH] perf symbol: Fix kernel symbol address display Date: Fri, 24 Apr 2020 14:37:01 +0200 Message-ID: <475a5c86-2be3-4f12-56f3-7bd6587e8ec3@linux.ibm.com> References: <20200415070744.59919-1-tmricht@linux.ibm.com> <20200420204617.GA23638@kernel.org> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit Return-path: In-Reply-To: <20200420204617.GA23638@kernel.org> Content-Language: en-US Sender: linux-kernel-owner@vger.kernel.org To: Arnaldo Carvalho de Melo Cc: linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, gor@linux.ibm.com, sumanthk@linux.ibm.com, heiko.carstens@de.ibm.com List-Id: linux-perf-users.vger.kernel.org On 4/20/20 10:46 PM, Arnaldo Carvalho de Melo wrote: > Em Wed, Apr 15, 2020 at 09:07:44AM +0200, Thomas Richter escreveu: >> Running commands >> >> ./perf record -e rb0000 -- find . >> ./perf report -v > > Or when pressing 'V' in the TUI. > >> reveals symbol names and its addresses. There is a mismatch between > > Yeah, an address that at some point was put there to help with debugging > the symbol resolution, IIRC how it looked like when looking at > > readelf -sW vmlinux > > Or any other DSO, for instance, for a glibc symbol here: > > Using 'perf report -s pid,dso,sym' then pressing 'V': > > 1.55% 20325:perf /usr/lib64/libc-2.30.so 0x161825 B [.] __strlen_avx2 > > [acme@five perf]$ readelf -sW /usr/lib64/libc-2.30.so | grep strlen_avx2 > 24371: 0000000000161810 414 FUNC LOCAL DEFAULT 15 __strlen_avx2 > [acme@five perf]$ > > Can you check if doing in /lib/modules/.../build/vmlinux produces what > appears when 'V' is in place? > > And perhaps we can also show the DSO offset and the rip as it gets laid > out in memory in the end? So we have all the informations? > > - Arnaldo > Arnaldo, having verified this also works in the TUI mode using 'V', are you going to pick this patch? Thanks -- Thomas Richter, Dept 3252, IBM s390 Linux Development, Boeblingen, Germany -- Vorsitzender des Aufsichtsrats: Matthias Hartmann Geschäftsführung: Dirk Wittkopp Sitz der Gesellschaft: Böblingen / Registergericht: Amtsgericht Stuttgart, HRB 243294