From mboxrd@z Thu Jan 1 00:00:00 1970 From: Milian Wolff Subject: Re: Callgraphs split at the kernel boundary Date: Mon, 04 Sep 2017 19:22:30 +0200 Message-ID: <3844492.W7veBuKMvv@milian-kdab2> References: <20170903094913.ddk52e4zd44zz3vn@kazak> <4314827.rDNsEPmXDr@milian-kdab2> <20170904170127.yuofaew6orzrxl5e@kazak> Mime-Version: 1.0 Content-Type: multipart/signed; boundary="nextPart3037308.rG5XZpxb8O"; micalg="sha256"; protocol="application/pkcs7-signature" Return-path: Received: from mail.kdab.com ([176.9.126.58]:53632 "EHLO mail.kdab.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753780AbdIDRWd (ORCPT ); Mon, 4 Sep 2017 13:22:33 -0400 In-Reply-To: <20170904170127.yuofaew6orzrxl5e@kazak> Sender: linux-perf-users-owner@vger.kernel.org List-ID: To: Ralph =?ISO-8859-1?Q?B=F6hme?= Cc: linux-perf-users@vger.kernel.org --nextPart3037308.rG5XZpxb8O Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="iso-8859-1" On Monday, September 4, 2017 7:01:27 PM CEST Ralph B=F6hme wrote: > On Mon, Sep 04, 2017 at 06:44:23PM +0200, Milian Wolff wrote: > > In my case, it seems to help to remove the filter. I.e. by default perf > > nowadays uses `cycles:uppp` on my system. If I instead specify `cycles:= P` > > explicitly at `perf record` time, the issue above seems to be reduced, > > albeit not completely. Does this help in your situation too? >=20 > nope, I still mostly see split callgraphs, when recording with >=20 > # perf record -e cycles:P -g -p 30027 >=20 > Eg (from perf script): >=20 > smbd 30027 66331.499304: 250000 cpu-clock:HG: I just realize that you are using this from within a VM which has no access= to=20 the PMU (so it's not using cycles but cpu-clock). So I doubt the issues we = two=20 are seeing are directly related. Sorry for the noise =2D-=20 Milian Wolff | milian.wolff@kdab.com | Senior Software Engineer KDAB (Deutschland) GmbH&Co KG, a KDAB Group company Tel: +49-30-521325470 KDAB - The Qt Experts --nextPart3037308.rG5XZpxb8O Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCDEIw ggXmMIIDzqADAgECAhBqm+E4O/8ra58B1dm4p1JWMA0GCSqGSIb3DQEBDAUAMIGFMQswCQYDVQQG EwJHQjEbMBkGA1UECBMSR3JlYXRlciBNYW5jaGVzdGVyMRAwDgYDVQQHEwdTYWxmb3JkMRowGAYD VQQKExFDT01PRE8gQ0EgTGltaXRlZDErMCkGA1UEAxMiQ09NT0RPIFJTQSBDZXJ0aWZpY2F0aW9u IEF1dGhvcml0eTAeFw0xMzAxMTAwMDAwMDBaFw0yODAxMDkyMzU5NTlaMIGXMQswCQYDVQQGEwJH QjEbMBkGA1UECBMSR3JlYXRlciBNYW5jaGVzdGVyMRAwDgYDVQQHEwdTYWxmb3JkMRowGAYDVQQK ExFDT01PRE8gQ0EgTGltaXRlZDE9MDsGA1UEAxM0Q09NT0RPIFJTQSBDbGllbnQgQXV0aGVudGlj YXRpb24gYW5kIFNlY3VyZSBFbWFpbCBDQTCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEB 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