From mboxrd@z Thu Jan 1 00:00:00 1970 From: Milian Wolff Subject: Re: Feedback on: [RESEND PATCH v2 0/5] perf report: Show inline stack Date: Mon, 09 Jan 2017 09:02:02 +0100 Message-ID: <1741616.SQg6AZICR4@milian-kdab2> References: <5135140.l86lTS2Zdn@agathebauer> Mime-Version: 1.0 Content-Type: multipart/signed; boundary="nextPart4280480.9aoTD2pTrK"; micalg="sha1"; protocol="application/pkcs7-signature" Return-path: Received: from mail.kdab.com ([176.9.126.58]:49890 "EHLO mail.kdab.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753095AbdAIICH (ORCPT ); Mon, 9 Jan 2017 03:02:07 -0500 In-Reply-To: Sender: linux-perf-users-owner@vger.kernel.org List-ID: To: "Jin, Yao" Cc: linux-perf-users --nextPart4280480.9aoTD2pTrK Content-Transfer-Encoding: 7Bit Content-Type: text/plain; charset="us-ascii" On Monday, January 9, 2017 11:07:26 AM CET Jin, Yao wrote: > Hi Wolff, > > Thanks a lot for your feedback. > > Have you tested with the browser mode? I mean without the "--stdio" option. Yes, I have done that: ~~~~~~~~~~~~ milian@milian-kdab2:/tmp$ g++ -O2 -g inline.cpp -o inline milian@milian-kdab2:/tmp$ perf record --call-graph dwarf ./inline 6.66016e+15 [ perf record: Woken up 5 times to write data ] [ perf record: Captured and wrote 1.215 MB perf.data (149 samples) ] ~~~~~~~~~~~~ Both with and without your patch (and passing --inline) I get: ~~~~~~~~~~~~ milian@milian-kdab2:/tmp$ perf report --no-children --inline Samples: 149 of event 'cycles:ppp', Event count (approx.): 141334499 Overhead Command Shared Object Symbol - 62.24% inline inline [.] main main __libc_start_main _start - 26.24% inline libm-2.24.so [.] __hypot_finite - __hypot_finite - 25.56% hypot main __libc_start_main _start 0.68% 0x40ead238ed1a2cf4 - 6.85% inline libm-2.24.so [.] hypot hypot main __libc_start_main _start ~~~~~~~~~~~~ > Could you give your test binary then I can try to reproduce the issue? I > have tried with my tests but I could not reproduce. The following code should reproduce the issue: ~~~~~~~~~~~~ #include #include #include #include using namespace std; int main() { uniform_real_distribution uniform(-1E5, 1E5); default_random_engine engine; double s = 0; for (int i = 0; i < 1000000; ++i) { s += norm(complex(uniform(engine), uniform(engine))); } cout << s << '\n'; return 0; } ~~~~~~~~~~~~ Hope this helps > On 1/8/2017 4:13 AM, Milian Wolff wrote: > > Hey Jin, > > > > I have finally had the time to test your patch series. Sadly, I hit a > > fundamental issue with it early on in my testing: > > > > In my test case, I get with `perf report --no-children` e.g. the following: > > 42.50% lab_mandelbrot libm-2.24.so [.] > > __hypot_finite > > > > ---__hypot_finite > > > > hypot > > main > > __libc_start_main > > _start > > > > Enabling --inline does not change the output, even though hypot is inlined > > into main. > > > > Looking at your code, it looks to me as if you are only trying to find > > inliners for root entries, cf. hist_entry__fprintf (stdio/hist.c), and > > only > > when unwinding failed (?, cf. (callchain_ret == 0)). > > > > Is this understanding correct, or should your patch also add inliners for > > nodes in the middle of the callstack? > > > > This approach makes the whole feature unusable for my use case. In my > > (really hacky) approach to adding inliners to the output of perf > > (https://github.com/ > > milianw/linux/commit/71d031c9d679bfb4a4044226e8903dd80ea601b3) I decided > > to lookup inliners for _every_ callchain entry. The result then there is > > with my> > > branch and a `perf report -g srcline --stdio`: > > 42.50% lab_mandelbrot libm-2.24.so [.] > > __hypot_finite > > > > ---__hypot_finite +387 > > > > hypot +20 > > std::__complex_abs complex:589 > > std::abs complex:597 > > drawMandelbrot mandelbrot.h:39 > > main main.cpp:55 > > __libc_start_main +241 > > _start +42 > > > > Note the three inliner entries in the middle of the callstack. The way I > > did it, one will also see "proper" entries for inlined functions in a > > top-down `perf report --children` output. > > > > In general, your patch series looks much more polished than mine, so I > > would love to get it integrated. But with your approach, we will need > > lots of changes to the various browsers to get all features in. My hacky > > approach has the nice property that it simply adds "normal" callchain > > entries for inlined nodes - maybe you should do the same? > > > > Thanks a lot for your work, much appreciated. -- 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 --nextPart4280480.9aoTD2pTrK 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 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