Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753568AbcDILo5 (ORCPT ); Sat, 9 Apr 2016 07:44:57 -0400 Received: from mail.kdab.com ([176.9.126.58]:38319 "EHLO mail.kdab.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753227AbcDILoz (ORCPT ); Sat, 9 Apr 2016 07:44:55 -0400 From: Milian Wolff To: Arnaldo Carvalho de Melo Cc: linux-perf-users@vger.kernel.org, Jiri Olsa , David Ahern , Brendan Gregg , Linux Kernel Mailing List , Namhyung Kim , Wang Nan Subject: Re: [PATCH] perf trace: Add support for printing call chains on sys_exit events. Date: Sat, 09 Apr 2016 13:44:51 +0200 Message-ID: <1714692.A55s9sBUmI@agathebauer> Organization: KDAB (Deutschland) GmbH&Co KG, a KDAB Group company In-Reply-To: <20160408181853.GC25165@kernel.org> References: <1460115255-17648-1-git-send-email-milian.wolff@kdab.com> <20160408175754.GB25165@kernel.org> <20160408181853.GC25165@kernel.org> MIME-Version: 1.0 Content-Type: multipart/signed; boundary="nextPart2307636.tl4RkQaI2W"; micalg="sha1"; protocol="application/pkcs7-signature" Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 13261 Lines: 242 --nextPart2307636.tl4RkQaI2W Content-Transfer-Encoding: 7Bit Content-Type: text/plain; charset="us-ascii" On Freitag, 8. April 2016 15:18:53 CEST Arnaldo Carvalho de Melo wrote: > Em Fri, Apr 08, 2016 at 02:57:54PM -0300, Arnaldo Carvalho de Melo escreveu: > > Em Fri, Apr 08, 2016 at 01:34:15PM +0200, Milian Wolff escreveu: > > > Now, one can print the call chain for every encountered sys_exit > > > event, e.g.: > > > > > > Note that it is advised to increase the number of mmap pages to > > > prevent event losses when using this new feature. Often, adding > > > `-m 10M` to the `perf trace` invocation is enough. > > > > > > This feature is also available in strace when built with libunwind > > > > > > via `strace -k`. Performance wise, this solution is much better: > > > $ time find path/to/linux &> /dev/null > > > > > > real 0m0.051s > > > user 0m0.013s > > > sys 0m0.037s > > > > > > $ time perf trace -m 800M --call-graph dwarf find path/to/linux &> > > > /dev/null > > > > > > real 0m2.624s > > > user 0m1.203s > > > sys 0m1.333s > > > > > > $ time strace -k find path/to/linux &> /dev/null > > > > > > real 0m35.398s > > > user 0m10.403s > > > sys 0m23.173s > > > > > > Note that it is currently not possible to configure the print output. > > > Adding such a feature, similar to what is available in `perf script` > > > via its `--fields` knob can be added later on. > > > > You mixed up multiple changes in one single patch, I'll break it down > > while testing, and before pushing upstream. > > Expanding a bit the audience: > > First test, it works, great! But do we really need that address? I guess > not, right, perhaps via some callchain parameter, to tell what we want to > see? But by default knowing the function name + DSO seems enough, no? ... > Yeah, you agree with that, now that I read the patch 8-): > > + /* TODO: user-configurable print_opts */ > + unsigned int print_opts = PRINT_IP_OPT_IP ;-) I even tried to make the code of `perf script` reusable for `perf trace`, but stopped once I realised that it currently relies on the existance of a `perf_session`, which does not exist when we do live tracing. It only exists for replaying in `builtin-trace.c`. So it involves some more refactoring which I did not have the time for. > Better, but perhaps we should try aligning, up to a limit, the function > names/DSOs? > > [root@jouet bpf]# trace -e nanosleep --call-graph dwarf usleep 1 > 0.063 ( 0.063 ms): usleep/6132 nanosleep(rqtp: 0x7ffd1b7a8e70 > ) = 0 syscall_slow_exit_work > ([kernel.kallsyms]) do_syscall_64 ([kernel.kallsyms]) > return_from_SYSCALL_64 ([kernel.kallsyms]) __nanosleep > (/usr/lib64/libc-2.22.so) usleep (/usr/lib64/libc-2.22.so) > [unknown] (/usr/bin/usleep) __libc_start_main > (/usr/lib64/libc-2.22.so) [unknown] (/usr/bin/usleep) > [root@jouet bpf]# > > wdyt? Yes, sounds good. Many profilers I've worked with always dump the IP, so I thought we should do it here as well. `perf script` e.g. does it. Could we maybe print the IP if the symbol is [unknown]? > Also, after this initial support is in, I think the next step is to > allow per syscall configs, like we have for per tracepoints, i.e. this > should be possible: > > # trace -e nanosleep(call-graph=dwarf),socket -a > > And then we would get callchains just for nanosleep calls, not for > socket ones. We then need to think how to ask that efficiently to the > kernel, in this case it should be instead of using > raw_syscalls:sys_enter + tracepoint filters set via ioctl, to use > syscalls:sys_{enter,exit}_nanosleep, with callgraphs + > syscalls:sys_{enter,exit}_socket, without. > > Doing it this way allows us to avoid asking callchains for a lot of > events when we want just for a few ones, to reduce overhead. Yep, sounds useful for some more specific use-cases. For me, this patch is sufficient as I'd just do: $ trace -e nanosleep --call-graph=dwarf ... What I think is more important though is to make sure we only ask for callchains on the sys_exit events. Afaik, my patch will do it also for the sys_enter which is just additional cost with no benefit? So fixing that first is I think even more important, but I don't know how. > Anyway, I think I'll just break this down into multiple patches and then > we can work on these other aspects. Yes, but note that I'll be busy and then on vacation for the next two weeks. I'll get back to this after wards. > David, ah, his patch floated on the linux-perf-users mailing list, easy > one once the thread->priv one got out of the way (it was being used by > builtin-trace.c and the unwind code, ugh). > > Thanks, Same to you, 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 --nextPart2307636.tl4RkQaI2W Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIIUdzCCBGYw ggNOoAMCAQICEFEmCpMc4n+cw6VfeeByroIwDQYJKoZIhvcNAQEFBQAwgZMxCzAJBgNVBAYTAlVT MQswCQYDVQQIEwJVVDEXMBUGA1UEBxMOU2FsdCBMYWtlIENpdHkxHjAcBgNVBAoTFVRoZSBVU0VS VFJVU1QgTmV0d29yazEhMB8GA1UECxMYaHR0cDovL3d3dy51c2VydHJ1c3QuY29tMRswGQYDVQQD ExJVVE4gLSBEQVRBQ29ycCBTR0MwHhcNMDUwNjA3MDgwOTEwWhcNMTkwNjI0MTkwNjMwWjBvMQsw 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