From mboxrd@z Thu Jan 1 00:00:00 1970 From: Milian Wolff Subject: Re: [PATCH v2] perf report: distinguish between inliners in the same function Date: Thu, 18 May 2017 14:20:10 +0200 Message-ID: <1807904.FlA7po8Zpv@agathebauer> References: <20170503213536.13905-1-milian.wolff@kdab.com> <2100411.JFybRMHOWM@agathebauer> <20170517061316.GE32691@danjae.aot.lge.com> Mime-Version: 1.0 Content-Type: multipart/signed; boundary="nextPart4913992.I8Lhqt6S2S"; micalg="sha1"; protocol="application/pkcs7-signature" Return-path: Received: from mail.kdab.com ([176.9.126.58]:58882 "EHLO mail.kdab.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932120AbdERMUN (ORCPT ); Thu, 18 May 2017 08:20:13 -0400 In-Reply-To: <20170517061316.GE32691@danjae.aot.lge.com> Sender: linux-perf-users-owner@vger.kernel.org List-ID: To: Namhyung Kim Cc: linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, Arnaldo Carvalho de Melo , David Ahern , Peter Zijlstra , Yao Jin , kernel-team@lge.com --nextPart4913992.I8Lhqt6S2S Content-Transfer-Encoding: 7Bit Content-Type: text/plain; charset="us-ascii" On Mittwoch, 17. Mai 2017 08:13:16 CEST Namhyung Kim wrote: > On Tue, May 16, 2017 at 03:18:13PM +0200, Milian Wolff wrote: > > On Dienstag, 16. Mai 2017 02:53:32 CEST Namhyung Kim wrote: > > > On Mon, May 15, 2017 at 12:01:54PM +0200, Milian Wolff wrote: > > > > On Monday, May 15, 2017 3:21:58 AM CEST Namhyung Kim wrote: > > > > > Hi Milian, > > > > > > > > > > On Sun, May 14, 2017 at 08:10:50PM +0200, Milian Wolff wrote: > > > > > > On Freitag, 12. Mai 2017 15:01:29 CEST Namhyung Kim wrote: > > > > > I think you'd be better adding (fake) dso and sym to keep the inline > > > > > information. The fake dso can be paired with the original dso and > > > > > maintain a tree of (inlined) symbols. You may need a fake map to > > > > > point the fake dso then. It seems a bit compilcated but that way > > > > > the > > > > > code will be more consistent and easier to handle (e.g. for caching > > > > > and/or deletion) IMHO. > > > > > > > > Can you expand on this please? How would that solve the problem of > > > > finding > > > > a function name or srcline for a given inline frame? > > > > > > > > I.e.: the function name is, currently, part of the sym. So the fake > > > > dso/map > > > > would contain an internal, fake, string table which fake symbols could > > > > leverage for the function name? > > > > > > > > Sounds like doable, but also sounds like *a lot* of work. And I don't > > > > see > > > > how that would solve the srcline situation: That one is queried > > > > on-demand > > > > based on the IP of a frame. I would say that inline frames should keep > > > > the IP of the first non-inlined frame. But that would make it > > > > impossible > > > > to find the srcline for the N'th inlined frame... Am I missing > > > > something? > > > > > > I agree that srcline info can be kept in callchain cursor nodes, but I > > > still think function name should be in (fake) symbols. Sharing a > > > symbol for all inlined frames would not work for the children mode > > > IMHO. > > > > I'm running into a bit of trouble here. I hoped to be able to store the > > inlined symbol in the DSO to reuse it for other inlined entries that use > > the same function. I also hope that this will then take care of the > > deletion of the fake symbols, once the dso is freed. > > I don't want to store inlined functions to an original DSO as it would > confuse symbol lookups in the DSO. As you said those inlined > functions will have same address so multiple symbols exist for an > address. > > I thought they can be kept in a fake DSO which should be linked to the > original DSO, but it doesn't need to be a DSO. Instead a DSO can have > a tree that maintains lists of (inlined) symbols and srclines sorted > by address. Thank you, this is what I'll be doing now. Cheers -- 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 --nextPart4913992.I8Lhqt6S2S 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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