From mboxrd@z Thu Jan 1 00:00:00 1970 From: Milian Wolff Subject: Re: perf call stacks on 32bit ARM v7 Date: Thu, 29 Sep 2016 12:33:23 +0200 Message-ID: <1679528.gn0OXkLKrD@agathebauer> References: <4233607.GXAFRqVoOG@agathebauer> <57EB203D.6000603@huawei.com> Mime-Version: 1.0 Content-Type: multipart/signed; boundary="nextPart1570862.x4RM62Xv9x"; micalg="sha1"; protocol="application/pkcs7-signature" Return-path: Received: from mail.kdab.com ([176.9.126.58]:46216 "EHLO mail.kdab.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754169AbcI2Kd3 (ORCPT ); Thu, 29 Sep 2016 06:33:29 -0400 In-Reply-To: Sender: linux-perf-users-owner@vger.kernel.org List-ID: To: Jean Pihet Cc: "Wangnan (F)" , linux-perf-users@vger.kernel.org, hekuang 00206996 --nextPart1570862.x4RM62Xv9x Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="iso-8859-1" On Donnerstag, 29. September 2016 09:39:51 CEST Jean Pihet wrote: > Hi Milian, Wangnan, >=20 > I am pretty busy this week. Let me check and come back to you next week. Sure, take your time - much appreciated! > PS: did you check the detailed instructions from the Linaro wiki pages? > These are linked from the Fosdem presentation slides. You mean this page, right: https://wiki.linaro.org/KenWerner/Sandbox/libunwind That does not mention perf at all, and only talks about libunwind. Note how= =20 your talk, and the wiki, say .exidx unwinding using libunwind works. But yo= ur=20 slides also explicitly say that this mechanism is not supported by perf, ye= t.=20 I would like to know the reason for that, or whether this is outdated=20 information. Thanks! > Le 28 sept. 2016 3:47 AM, "Wangnan (F)" a =E9crit : > > On 2016/9/28 5:25, Milian Wolff wrote: > >> Hello Jean, others. > >>=20 > >> Can someone please clarify the requirements for getting perf to proper= ly > >> unwind the call stack on 32bit ARM v7? > >>=20 > >> Looking at [1], it seems that I need either (a) frame pointers, or (b) >=20 > DWARF >=20 > >> debug information. Because (a) is often not available, and (b) is too >=20 > large >=20 > >> for small flash drives on embedded - how do I use perf with split debug > >> information files? I.e. I have tries to record on the arm board using >=20 > DWARF: > >> arm-v7$ perf record --call-graph dwarf ... > >>=20 > >> Then transferred the perf.data file over to my host machine. Perf >=20 > archive said >=20 > >> that no build-id's could be found, so I'm not using that. Instead, I t= ry >=20 > to >=20 > >> ask perf to find the split debug packes using symfs: > >>=20 > >> x86-64$ perf report --symfs ... -g graph > >>=20 > >> But that does not work and I'm not seeing any backtraces. Stracing the >=20 > report, >=20 > >> I don't see it even trying to access files - how can I debug this and >=20 > figure >=20 > >> out what I'm supposed to be using? > >=20 > > Unfortunaetly, currently perf only supports corss decoding dwarf > > for x86_64, x86_32 and arm64. ARM32 is not on the list. > >=20 > > Please see: > >=20 > > http://www.spinics.net/lists/kernel/msg2266293.html > >=20 > > and > >=20 > > tools/perf/util/unwind-libunwind.c > >=20 > > I think adding ARM32 support should not be very hard on perf side. > > Add He Kuang to the CC list, he is the author of this patch set. > >=20 > > Thank you. =2D-=20 Milian Wolff | milian.wolff@kdab.com | Software Engineer KDAB (Deutschland) GmbH&Co KG, a KDAB Group company Tel: +49-30-521325470 KDAB - The Qt Experts --nextPart1570862.x4RM62Xv9x Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIIUdzCCBGYw ggNOoAMCAQICEFEmCpMc4n+cw6VfeeByroIwDQYJKoZIhvcNAQEFBQAwgZMxCzAJBgNVBAYTAlVT MQswCQYDVQQIEwJVVDEXMBUGA1UEBxMOU2FsdCBMYWtlIENpdHkxHjAcBgNVBAoTFVRoZSBVU0VS VFJVU1QgTmV0d29yazEhMB8GA1UECxMYaHR0cDovL3d3dy51c2VydHJ1c3QuY29tMRswGQYDVQQD 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