From mboxrd@z Thu Jan 1 00:00:00 1970 From: Milian Wolff Subject: Re: [PATCH v2] perf report: fix off-by-one for non-activation frames Date: Tue, 16 May 2017 18:26:47 +0200 Message-ID: <3393633.IVaOaPmc4x@agathebauer> References: <20170516085951.4056-1-milian.wolff@kdab.com> <20170516143829.GA12886@danjae.aot.lge.com> <3048427.F5Pep8qUR7@agathebauer> Mime-Version: 1.0 Content-Type: multipart/signed; boundary="nextPart4439779.jGcbo5zM5K"; micalg="sha1"; protocol="application/pkcs7-signature" Return-path: Received: from mail.kdab.com ([176.9.126.58]:33636 "EHLO mail.kdab.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751750AbdEPQ0u (ORCPT ); Tue, 16 May 2017 12:26:50 -0400 In-Reply-To: <3048427.F5Pep8qUR7@agathebauer> 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 --nextPart4439779.jGcbo5zM5K Content-Transfer-Encoding: 7Bit Content-Type: text/plain; charset="us-ascii" On Dienstag, 16. Mai 2017 18:17:26 CEST Milian Wolff wrote: > On Dienstag, 16. Mai 2017 16:38:29 CEST Namhyung Kim wrote: > > On Tue, May 16, 2017 at 10:59:51AM +0200, Milian Wolff wrote: > > > As the documentation for dwfl_frame_pc says, frames that > > > are no activation frames need to have their program counter > > > decremented by one to properly find the function of the caller. > > > > > > This fixes many cases where perf report currently attributes > > > the cost to the next line. I.e. I have code like this: > > > > > > ~~~~~~~~~~~~~~~ > > > > > > #include > > > #include > > > > > > using namespace std; > > > > > > int main() > > > { > > > > > > this_thread::sleep_for(chrono::milliseconds(1000)); > > > this_thread::sleep_for(chrono::milliseconds(100)); > > > this_thread::sleep_for(chrono::milliseconds(10)); > > > > > > return 0; > > > > > > } > > > > > > ~~~~~~~~~~~~~~~ > > > > It'd be nice if the test program has a signal frame for verification. > > I have pretty much zero experience about signals. Would it be enough to add > a signal handler for, say, SIGUSR1 to my test application and then trigger > a sleep when that signal is delivered? If that should be enough, I'll write > and test it out. ~~~~~~~~~~~~~~~ #include #include #include using namespace std; volatile bool run_loop = true; void my_handler(int signum) { this_thread::sleep_for(chrono::milliseconds(1000)); this_thread::sleep_for(chrono::milliseconds(100)); this_thread::sleep_for(chrono::milliseconds(10)); run_loop = false; } int main() { signal(SIGUSR1, my_handler); while (run_loop) {} return 0; } ~~~~~~~~~~~~~~~ This does not properly unwind neither before nor after this patch. I only ever get: 100.00% core.c:0 | ---__schedule core.c:0 schedule do_nanosleep hrtimer.c:0 hrtimer_nanosleep sys_nanosleep entry_SYSCALL_64_fastpath .tmp_entry_64.o:0 __nanosleep_nocancel .:0 std::this_thread::sleep_for > thread:323 So... should this work? Please tell me how to test this properly. Thanks -- 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 --nextPart4439779.jGcbo5zM5K 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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