From mboxrd@z Thu Jan 1 00:00:00 1970 From: Milian Wolff Subject: Re: Tracing sched_switch events for client application when process is switched back in Date: Mon, 14 Nov 2016 15:10:26 +0100 Message-ID: <9863268.pt3viFMpJL@milian-kdab2> References: <10618911.8qrkJBTkNF@milian-kdab2> <4514930.f3mZKdtDhX@milian-kdab2> <20161011003655.GP4809@kernel.org> Mime-Version: 1.0 Content-Type: multipart/signed; boundary="nextPart92448173.OAAKODbE5h"; micalg="sha1"; protocol="application/pkcs7-signature" Return-path: Received: from mail.kdab.com ([176.9.126.58]:51150 "EHLO mail.kdab.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751636AbcKNOKa (ORCPT ); Mon, 14 Nov 2016 09:10:30 -0500 In-Reply-To: <20161011003655.GP4809@kernel.org> Sender: linux-perf-users-owner@vger.kernel.org List-ID: To: Arnaldo Carvalho de Melo Cc: linux-perf-users@vger.kernel.org --nextPart92448173.OAAKODbE5h Content-Transfer-Encoding: 7Bit Content-Type: text/plain; charset="us-ascii" On Monday, October 10, 2016 9:36:55 PM CET Arnaldo Carvalho de Melo wrote: > Em Thu, Oct 06, 2016 at 06:38:28PM +0200, Milian Wolff escreveu: > > On Thursday, October 6, 2016 1:21:25 PM CEST Arnaldo Carvalho de Melo wrote: > > > Em Thu, Oct 06, 2016 at 05:52:51PM +0200, Milian Wolff escreveu: > > > > Hey all, > > > > > > > > when you have an application like this: > > > > > > > > ~~~~~~ > > > > #include > > > > > > > > int main() > > > > { > > > > > > > > for (int i = 0; i < 100; ++i) { > > > > > > > > usleep(10); > > > > > > > > } > > > > > > > > } > > > > ~~~~~~ > > > > > > > > Then record sched:sched_switch events for it: > > > > > > > > ~~~~~~ > > > > $ perf record -e sched:sched_switch ./a.out > > > > [ perf record: Woken up 1 times to write data ] > > > > [ perf record: Captured and wrote 0.031 MB perf.data (100 samples) ] > > > > ~~~~~~ > > > > > > > > Note how it's only 100 samples, instead of 200 for both, the > > > > switch-out > > > > and > > > > switch-in events. Apparently we only get the switch-out events: > > > > > > > > ~~~~~ > > > > $ perf script -F trace | uniq -c > > > > > > > > 99 a.out:3994 [120] S ==> swapper/7:0 [120] > > > > > > > > 1 a.out:3994 [120] S ==> swapper/7:0 [1 > > > > > > > > ~~~~~ > > > > > > > > Doing a global trace, or using LTTNG, we also see the switch-in > > > > events: > > > > > > > > ~~~~~ > > > > $ perf record -e sched:sched_switch -a ./a.out > > > > $ perf script -F trace | grep a.out | sort | uniq -c > > > > > > > > 100 a.out:11570 [120] S ==> swapper/4:0 [120] > > > > > > > > 1 a.out:11570 [120] x ==> swapper/4:0 [120] > > > > > > > > 100 swapper/4:0 [120] R ==> a.out:11570 [120] > > > > > > > > ~~~~~ > > > > > > > > Is there any way I can get both sched switch events, i.e. not only the > > > > one > > > > with prev_tid=$client_tid, but also the one with next_tid=$client_tid? > > > > One > > > > way > > > > > > > that seems to work is the following: > > > Have you considered using PERF_RECORD_SWITCH? > > > > > > [acme@jouet linux]$ perf record --switch-events sleep 1 > > > [ perf record: Woken up 1 times to write data ] > > > [ perf record: Captured and wrote 0.020 MB perf.data (7 samples) ] > > > [acme@jouet linux]$ perf script --show-switch-events > > > > > > sleep 20679 5578.172409: 1 cycles:u: 7fb4e5a51c80 > > > > > > _start+0x0 (/usr/lib64/ld-2.23.so) sleep 20679 5578.172411: 1 > > > cycles:u: 7fb4e5a51c80 _start+0x0 (/usr/lib64/ld-2.23.so) sleep > > > 20679 > > > 5578.172412: 12 cycles:u: 7fb4e5a51c80 _start+0x0 > > > (/usr/lib64/ld-2.23.so) sleep 20679 5578.172413: 397 cycles:u: > > > > > > 7fb4e5a51c80 _start+0x0 (/usr/lib64/ld-2.23.so) sleep 20679 5578.172414: > > > 13936 cycles:u: ffffffffb77ee7a0 page_fault+0x0 > > > > > > (/usr/lib/debug/lib/modules/4.7.5-200.fc24.x86_64/vmlinux) sleep 20679 > > > 5578.172431: 330542 cycles:u: 7fb4e5a5301f dl_main+0x6cf > > > (/usr/lib64/ld-2.23.so) sleep 20679 5578.172700: PERF_RECORD_SWITCH OUT > > > > > > sleep 20679 5579.172821: PERF_RECORD_SWITCH IN > > > sleep 20679 5579.172838: 802931 cycles:u: 7fb4e5a6122e > > > > > > _dl_fini+0x8e (/usr/lib64/ld-2.23.so) [acme@jouet linux]$ > > > > First time I read about it, and the documentation is scarce, to not say > > non- existing. It seems to record cycles for the switch events. But why > > does it > > > > > > > > only find 7, whereas tracing sched_switch finds all 100 that actually take > > place? Hey there, long delay but I looked at this again today. > This is looking only for the sched switches for the monitored workload, > which in this case is 'sleep 1', this wasn't a system wide session. > > add -a and you'll get those other switches, if I got what you described. I've used the sources of the simple C application I showed in the first email of this thread (still quoted above). Then I try: perf record --switch-events -a ./a.out And indeed, I get all switch events. But I now also profile all applications on the machine, which is not what I want. I want to combine the following features: - sample CPU events for a given application with backtraces perf record --call-graph dwarf ./foo - record switch-out events with backtraces (`-e sched:sched_switch/fp=dwarf/`) - somehow record the switch-in events, which are associated with a different process and thus currently discarded Any advise on where to look for the filtering? Not discarding the sched_switch of a different process based on matching next_tid can't be that hard, or is it? 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 --nextPart92448173.OAAKODbE5h 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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