From mboxrd@z Thu Jan 1 00:00:00 1970 From: Milian Wolff Subject: Re: [PATCH] perf report: Support caller callchain order when using DWARF unwinder. Date: Fri, 09 Oct 2015 19:29:34 +0200 Message-ID: <2192570.dg0L2eaEiH@agathebauer> References: <1443971797-25548-1-git-send-email-milian.wolff@kdab.com> <20151004203817.GE20515@kernel.org> <20151005110836.GA28364@krava.landal.opennet> Mime-Version: 1.0 Content-Type: multipart/signed; boundary="nextPart1497546.2FYJhnlTJm"; micalg="sha1"; protocol="application/pkcs7-signature" Return-path: Received: from mail.kdab.com ([176.9.126.58]:33947 "EHLO mail.kdab.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758597AbbJIR3m (ORCPT ); Fri, 9 Oct 2015 13:29:42 -0400 In-Reply-To: <20151005110836.GA28364@krava.landal.opennet> Sender: linux-perf-users-owner@vger.kernel.org List-ID: To: Jiri Olsa Cc: Arnaldo Carvalho de Melo , linux-perf-users@vger.kernel.org, Jiri Olsa , Namhyung Kim , =?ISO-8859-1?Q?Fr=E9d=E9ric?= Weisbecker --nextPart1497546.2FYJhnlTJm Content-Transfer-Encoding: 7Bit Content-Type: text/plain; charset="us-ascii" On Montag, 5. Oktober 2015 13:08:36 CEST Jiri Olsa wrote: > On Sun, Oct 04, 2015 at 05:38:17PM -0300, Arnaldo Carvalho de Melo wrote: > > Em Sun, Oct 04, 2015 at 05:16:37PM +0200, Milian Wolff escreveu: > > > We cannot reverse the order of the libunwind stepper. To workaround > > > this, we store the IPs in a temporary stack buffer and then walk > > > this buffer in reverse order when callchain_param.order is set to > > > ORDER_CALLER. > > > > > > Signed-off-by: Milian Wolff > > > > Jiri, > > > > Can you please take a look at this? > > > > - Arnaldo > > > > > Cc: Arnaldo Carvalho de Melo > > > --- > > > > > > tools/perf/util/unwind-libunwind.c | 21 +++++++++++++++++---- > > > 1 file changed, 17 insertions(+), 4 deletions(-) > > > > > > diff --git a/tools/perf/util/unwind-libunwind.c > > > b/tools/perf/util/unwind-libunwind.c index 4c00507..bf631f1 100644 > > > --- a/tools/perf/util/unwind-libunwind.c > > > +++ b/tools/perf/util/unwind-libunwind.c > > > @@ -621,11 +621,24 @@ static int get_entries(struct unwind_info *ui, > > > unwind_entry_cb_t cb,> > > > > if (ret) > > > > > > display_error(ret); > > > > > > - while (!ret && (unw_step(&c) > 0) && max_stack--) { > > > - unw_word_t ip; > > > + if (callchain_param.order == ORDER_CALLEE) { > > > + while (!ret && (unw_step(&c) > 0) && max_stack--) { > > > + unw_word_t ip; > > > > > > - unw_get_reg(&c, UNW_REG_IP, &ip); > > > - ret = ip ? entry(ip, ui->thread, cb, arg) : 0; > > > + unw_get_reg(&c, UNW_REG_IP, &ip); > > > + ret = ip ? entry(ip, ui->thread, cb, arg) : 0; > > > + } > > > + } else { > > > + unw_word_t ips[max_stack]; > > > + int i = 0; > > > + > > > + while ((unw_step(&c) > 0) && i < max_stack) { > > > + unw_get_reg(&c, UNW_REG_IP, &ips[i]); > > > + ++i; > > > + } > > > + max_stack = i; > > > + for (i = max_stack - 1; i >= 0; --i) > > > + entry(ips[i], ui->thread, cb, arg); > > there's no check for return value of entry callback > > also I wonder would it be better to store into ips[] within > the single loop all the time, and iterate throught it after > forward/backward based on the callchain_param.order > > please check attached patch, totaly untested, probably leaking some index > ;-) > > any chance this could be done also for util/unwind-libdw.c ? That patch looks much better than mine. I'll try it out later next week and will also have a look at util/unwind-libdw.c. Question: How can I test the behavior of the latter? Do I need to uninstall libunwind, or can I change the unwinder at runtime somehow (env var?). Also, are there unit tests for this behavior somewhere? -- 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 --nextPart1497546.2FYJhnlTJm 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 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