From mboxrd@z Thu Jan 1 00:00:00 1970 From: Milian Wolff Subject: Re: Improved backtraces with srcline in perf report Date: Tue, 30 Aug 2016 15:19:07 +0200 Message-ID: <24142371.c505daakIu@milian-kdab2> References: <5097362.aBWkQI5end@milian-kdab2> Mime-Version: 1.0 Content-Type: multipart/signed; boundary="nextPart1613111.RmUt5tbBZN"; micalg="sha1"; protocol="application/pkcs7-signature" Return-path: Received: from mail.kdab.com ([176.9.126.58]:49320 "EHLO mail.kdab.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750795AbcH3NTL (ORCPT ); Tue, 30 Aug 2016 09:19:11 -0400 In-Reply-To: <5097362.aBWkQI5end@milian-kdab2> Sender: linux-perf-users-owner@vger.kernel.org List-ID: To: linux-perf-users@vger.kernel.org --nextPart1613111.RmUt5tbBZN Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="us-ascii" Hey all, Sorry, hit send too early. Resending here with the complete message: I would like to work on improving the usability of the way backtraces are reported by perf. See also my mail on that topic from a few weeks ago ("usability issues with inlining and backtraces"). Status quo: ~~~~~~~~~~~~~~~~ perf report --no-children -s dso,sym,srcline -g address --stdio # Samples: 8K of event 'cycles:ppp' # Event count (approx.): 8164367769 # # Overhead Shared Object Symbol Source:Line # ........ .......................... =2E................................................................. =2E............................................ # 7.82% lab_mandelbrot [.] main mandelbrot.h:41 | |--2.84%--main mandelbrot.h:41 | __libc_start_main +241 | _start +4194346 | |--2.58%--main mandelbrot.h:41 | --2.01%--main mandelbrot.h:41 __libc_start_main +241 _start +4194346 7.79% libgcc_s.so.1 [.] __muldc3 libgcc2.c:1945 | |--3.93%--__muldc3 libgcc2.c:1945 | main mandelbrot.h:39 | __libc_start_main +241 | _start +4194346 | --3.72%--__muldc3 libgcc2.c:1945 main mandelbrot.h:39 __libc_start_main +241 _start +4194346 ~~~~~~~~~~~~~~~~ Note: I have no idea why unwinding failed for the second main entry of 2.58% cost, but that is not topic of this email. I would like to fix the following issues in descending priority. Please adv= ise me whether these ideas are acceptable and, more importantly, where to implement them in the existing perf code base. a) merge entries with equal labels Most lines of code will contain multiple instructions. When translating them to srcline (-g address), the addresses will get mapped to the same labels. = In the above case e.g. this distinction simply adds visual noise with no value= at all. Instead, I'd like the report to show me: ~~~~~~~~~~~~~~~~ 7.82% lab_mandelbrot [.] main mandelbrot.h:41 | |--4.85%--main mandelbrot.h:41 | __libc_start_main +241 | _start +4194346 | |--2.58%--main mandelbrot.h:41 7.79% libgcc_s.so.1 [.] __muldc3 libgcc2.c:1945 | |--7.79%--__muldc3 libgcc2.c:1945 | main mandelbrot.h:39 | __libc_start_main +241 | _start +4194346 ~~~~~~~~~~~~~~~~ The merging of the entries must take backtraces into account, but must not merge based on the the ip/address of entries in the backtrace, but merge ba= sed on the symbol/label. Especially for more complex applications, where the same code gets called f= rom different functions (and we thus have different backtraces), this aggregati= on of costs will greatly simplify the analysis. b) Add inliners The above report is highly confusing, as a lot of code gets inlined and perf does not show the symbols of inlined functions. I.e. I'd like the report to show me: ~~~~~~~~~~~~~~~~ 7.82% lab_mandelbrot [.] drawMandelbrot mandelbrot.h:41 | |--4.85%--drawMandelbrot mandelbrot.h:41 | main main.cpp:55 | __libc_start_main +241 | _start +4194346 | |--2.58%--drawMandelbrot mandelbrot.h:41 | main main.cpp:55 7.79% libgcc_s.so.1 [.] __muldc3 libgcc2.c:1945 | |--7.79%--__muldc3 libgcc2.c:1945 | std::complex::operator*=3D complex:1= 326 | std::operator* complex:389 | drawMandelbrot mandelbrot.h:39 | main main.cpp:55 | __libc_start_main +241 | _start +4194346 ~~~~~~~~~~~~~~~~ The information for that exists in DWARF and can already be read out in perf using the `bfd_find_inliner_info` code in util/srcline.c:addr2line. Could someone please tell me what refactoring is required to make this work= in perf? It seems to be non-trivial. c) Skip backtrace entries above main Low priority, but for me the __libc_start_main and _start entries are just useless noise and could be skipped. Many other tools, including GDB, do thi= s. d) Skip backtrace entries outside "user-functions +1" One of the most useful features in VTune's GUI is its capability to skip backtrace entries that lie outside the scope of an application developer=20 domain. This is similar to the above, but goes further. E.g. for the above, I'd onl= y=20 see ~~~~~~~~~~~~~~~~ 7.79% libgcc_s.so.1 [.] std::operator* libgcc2.c:1945 | |--7.79%-- std::operator* complex:389 | drawMandelbrot mandelbrot.h:39 | main main.cpp:55 | __libc_start_main +241 | _start +4194346 ~~~~~~~~~~~~~~~~ This by itself does not look like a big advantage. But in reality this pair= ed with the other changes above will increase the cost for this entry considerably, as many other entries that are somewhere below complex:389 wi= ll get aggregated into this. Doing this aggregation in my head, I see that the cost would then lie at approximately ~24%. In a simply application I can get to that number by looking at the top-down cost (i.e. omitting --no-children= ), but for complex applications that is not an option as often the same functi= ons will be called from different places. =46rom my application developer POV, this is kind of aggregation is highly advantageous. Most of the time one's hands are bound and one cannot fix=20 anything in the implementation of functions in third party libraries (like stdlib).= =20 What one can do though is improving one's application code to call certain=20 functions less. Thanks for reading that far. As I said, suggestions on how to implement the= se features would be highly welcome. If you think that the above are bad ideas, please explain me why. Thanks =2D- 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 --nextPart1613111.RmUt5tbBZN 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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