From mboxrd@z Thu Jan 1 00:00:00 1970 From: Milian Wolff Subject: Re: usability issues with inlining and backtraces Date: Mon, 15 Aug 2016 13:44:51 +0200 Message-ID: <2915251.99QXSDB1Jd@milian-kdab2> References: <3421510.JYGX19gbWH@milian-kdab2> <20160523141104.GG8897@kernel.org> Mime-Version: 1.0 Content-Type: multipart/signed; boundary="nextPart7827720.f4kavmW8WW"; micalg="sha1"; protocol="application/pkcs7-signature" Return-path: Received: from mail.kdab.com ([176.9.126.58]:51492 "EHLO mail.kdab.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752684AbcHOLoz (ORCPT ); Mon, 15 Aug 2016 07:44:55 -0400 In-Reply-To: <20160523141104.GG8897@kernel.org> Sender: linux-perf-users-owner@vger.kernel.org List-ID: To: acme@kernel.org Cc: linux-perf-users@vger.kernel.org --nextPart7827720.f4kavmW8WW Content-Transfer-Encoding: 7Bit Content-Type: text/plain; charset="us-ascii" On Monday, May 23, 2016 11:11:04 AM CEST Arnaldo Carvalho de Melo wrote: > Em Mon, May 23, 2016 at 11:10:00AM +0200, Milian Wolff escreveu: > > Hey all, > > > > I've recently encountered some nasty issues with perf which should - I > > hope - be possible to be fixed. > > I've quickly read this, all interesting, but I need some time to digest > it fully, which I don't have right now, I'll get to it as soon as I can. > > The fact that other open source tools do it as you expect is a precious > observation, as we can go look at how they solved problems. I have now found something very interesting in the perf code base: The addr2line implementation with HAVE_LIBBFD_SUPPORT is actually capable of producing backtraces that include inliners, similar to what GDB can do. If I add debug output to the bfd_find_inliner_info loop inside addr2line in srcline.c, and force unwind_inlines to true, then I see e.g.: ~~~~~~~~~~ inline: 0 _ZNSt8__detail4_ModImLm2147483647ELm16807ELm0ELb1ELb1EE6__calcEm (/ usr/include/c++/6.1.1/bits/random.h:143) inline: 1 _ZNSt8__detail5__modImLm2147483647ELm16807ELm0EEET_S1_ (/usr/ include/c++/6.1.1/bits/random.h:151) inline: 2 _ZNSt26linear_congruential_engineImLm16807ELm0ELm2147483647EEclEv (/ usr/include/c++/6.1.1/bits/random.h:332) inline: 3 _ZSt18generate_canonicalIdLm53ESt26linear_congruential_engineImLm16807ELm0ELm2147483647EEET_RT1_ (/usr/include/c++/6.1.1/bits/random.tcc:3332) inline: 4 _ZNSt8__detail8_AdaptorISt26linear_congruential_engineImLm16807ELm0ELm2147483647EEdEclEv (/usr/include/c++/6.1.1/bits/random.h:185) inline: 5 _ZNSt25uniform_real_distributionIdEclISt26linear_congruential_engineImLm16807ELm0ELm2147483647EEEEdRT_RKNS0_10param_typeE (/usr/include/c++/6.1.1/bits/random.h:1818) inline: 6 _ZNSt25uniform_real_distributionIdEclISt26linear_congruential_engineImLm16807ELm0ELm2147483647EEEEdRT_ (/usr/include/c++/6.1.1/bits/random.h:1809) inline: 7 main (/path/to/test.cpp:14) ~~~~~~~~~~ I would really like to see this information be included in the call graph shown by perf, e.g. in the stdio/browser output of perf report, but also in perf script etc. pp. Can someone suggest a way to do that? These entries cannot be represented by a normal instruction pointer address, so extending the existing callchains with additional entries is not straight forward to do. Thanks -- 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 --nextPart7827720.f4kavmW8WW Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIIUdzCCBGYw ggNOoAMCAQICEFEmCpMc4n+cw6VfeeByroIwDQYJKoZIhvcNAQEFBQAwgZMxCzAJBgNVBAYTAlVT MQswCQYDVQQIEwJVVDEXMBUGA1UEBxMOU2FsdCBMYWtlIENpdHkxHjAcBgNVBAoTFVRoZSBVU0VS VFJVU1QgTmV0d29yazEhMB8GA1UECxMYaHR0cDovL3d3dy51c2VydHJ1c3QuY29tMRswGQYDVQQD ExJVVE4gLSBEQVRBQ29ycCBTR0MwHhcNMDUwNjA3MDgwOTEwWhcNMTkwNjI0MTkwNjMwWjBvMQsw CQYDVQQGEwJTRTEUMBIGA1UEChMLQWRkVHJ1c3QgQUIxJjAkBgNVBAsTHUFkZFRydXN0IEV4dGVy bmFsIFRUUCBOZXR3b3JrMSIwIAYDVQQDExlBZGRUcnVzdCBFeHRlcm5hbCBDQSBSb290MIIBIjAN BgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAt/caM+byAAQtOeBOW+0fvGwPzbX6I7bO3psRM5ek 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