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: Sun, 14 May 2017 20:10:50 +0200 Message-ID: <3856259.BJNyvrKptd@agathebauer> References: <20170503213536.13905-1-milian.wolff@kdab.com> <1673560.Uk8cHjlLU8@agathebauer> <20170512130129.GB3839@danjae.aot.lge.com> Mime-Version: 1.0 Content-Type: multipart/signed; boundary="nextPart2418559.LHughTaye4"; micalg="sha1"; protocol="application/pkcs7-signature" Return-path: Received: from mail.kdab.com ([176.9.126.58]:43436 "EHLO mail.kdab.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1759089AbdENSKy (ORCPT ); Sun, 14 May 2017 14:10:54 -0400 In-Reply-To: <20170512130129.GB3839@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 --nextPart2418559.LHughTaye4 Content-Transfer-Encoding: 7Bit Content-Type: text/plain; charset="us-ascii" On Freitag, 12. Mai 2017 15:01:29 CEST Namhyung Kim wrote: > On Fri, May 12, 2017 at 12:37:01PM +0200, Milian Wolff wrote: > > On Mittwoch, 10. Mai 2017 07:53:52 CEST Namhyung Kim wrote: > > > Hi, > > > > > On Wed, May 03, 2017 at 11:35:36PM +0200, Milian Wolff wrote: > > > > > > > > +static enum match_result match_chain_srcline(struct > > > > callchain_cursor_node > > > > *node, + struct callchain_list *cnode) > > > > +{ > > > > + char *left = get_srcline(cnode->ms.map->dso, > > > > + map__rip_2objdump(cnode->ms.map, cnode->ip), > > > > + cnode->ms.sym, true, false); > > > > + char *right = get_srcline(node->map->dso, > > > > + map__rip_2objdump(node->map, node->ip), > > > > + node->sym, true, false); > > > > + enum match_result ret = match_chain_strings(left, right); > > > > > > I think we need to check inlined srcline as well. There might be a > > > case that two samples have different addresses (and from different > > > callchains) but happens to be mapped to a same srcline IMHO. > > > > I think I'm missing something, but isn't this what this function provides? > > The function above is now being used by the match_chain_inliner function > > below. > > > > Ah, or do you mean for code such as this: > > > > ~~~~~ > > inline_func_1(); inline_func_2(); > > ~~~~~ > > > > Here, both branches could be inlined into the same line and the same issue > > would occur, i.e. different branches get collapsed into the first match > > for > > the given srcline? > > > > Hm yes, this should be fixed too. > > OK. > > > But, quite frankly, I think it just shows more and more that the current > > inliner support is really fragile and leads to lots of issues throughout > > the code base as the inlined frames are different from non-inlined > > frames, but should most of the same be handled just like them. > > > > So, maybe it's time to once more think about going back to my initial > > approach: Make inlined frames code-wise equal to non-inlined frames, i.e. > > instead of requesting the inlined frames within match_chain, do it outside > > and create callchain_node/callchain_cursor instances (not sure which one > > right now) for the inlined frames too. > > > > This way, we should be able to centrally add support for inlined frames > > and > > all areas will benefit from it: > > > > - aggregation by srcline/function will magically work > > - all browsers will automatically display them, i.e. no longer need to > > duplicate the code for inliner support in perf script, perf report tui/ > > stdio/... > > - we can easily support --inline in other tools, like `perf trace --call- > > graph` > > > > So before I invest more time trying to massage match_chain to behave well > > for inline nodes, can I get some feedback on the above? > > Fair enough. I agree that it'd be better adding them as separate > callchain nodes when resolving callchains. Can you, or anyone else more involved with the current callchain code, guide me a bit? My previous attempt at doing this can be seen here: https://github.com/milianw/linux/commit/ 71d031c9d679bfb4a4044226e8903dd80ea601b3 There are some issues with that. Most of it boils down to the question of how to feed an inlined frame into a callchain_cursor_node. The latter contains a symbol* e.g. and users of that class currently rely on using the IP to find e.g. the corresponding srcline. >From what I can see, we either have to hack inline nodes in there, cf. my original approach in the github repo above. Or, better, we would have to (heavily?) refactor the callchain_cursor_node struct and the code depending on it. What I have in mind would be something like adding two members to this struct: const char* funcname; const char* srcline; For non-inlined frames, the funcname aliases the `symbol->name` value, and the srcline is queried as-needed. For inlined frames the values from the inlined node struct are used. The inlined frames for a given code location would all share the same symbol and ip. Would that be OK as a path forward? 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 --nextPart2418559.LHughTaye4 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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