From mboxrd@z Thu Jan 1 00:00:00 1970 From: Milian Wolff Subject: Re: Accessing sample data (like period) for trace events from python scripts Date: Tue, 23 Aug 2016 21:48:47 +0200 Message-ID: <2835168.PUTtWJavUK@agathebauer> References: <12483222.2TZrqxLJ8H@agathebauer> <1994747.p0vVkFxHI8@agathebauer> Mime-Version: 1.0 Content-Type: multipart/signed; boundary="nextPart1496718.XNu2NAFKOW"; micalg="sha1"; protocol="application/pkcs7-signature" Return-path: Received: from mail.kdab.com ([176.9.126.58]:47974 "EHLO mail.kdab.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751198AbcHWTsx (ORCPT ); Tue, 23 Aug 2016 15:48:53 -0400 In-Reply-To: Sender: linux-perf-users-owner@vger.kernel.org List-ID: To: Namhyung Kim Cc: linux-perf-users --nextPart1496718.XNu2NAFKOW Content-Transfer-Encoding: 7Bit Content-Type: text/plain; charset="us-ascii" On Dienstag, 23. August 2016 11:42:54 CEST Namhyung Kim wrote: > Hello Milian, Hey Namhyung, > On Sun, Aug 21, 2016 at 5:30 AM, Milian Wolff wrote: > > On Freitag, 19. August 2016 10:51:01 CEST Namhyung Kim wrote: > >> On Fri, Aug 19, 2016 at 10:35:49AM +0900, Namhyung Kim wrote: > >> > On Wed, Aug 17, 2016 at 10:48:31AM +0200, Milian Wolff wrote: > >> > > On Wednesday, August 17, 2016 12:05:53 PM CEST Namhyung Kim wrote: > >> > > > Hi Milian, > >> > > > > >> > > > On Tue, Aug 16, 2016 at 08:42:01PM +0200, Milian Wolff wrote: > >> > > > > Hey all, > >> > > > > > >> > > > > It doesn't seem to be possible to access the period, tid and > >> > > > > various > >> > > > > other > >> > > > > sample fields from a python (and perl?) script using `perf > >> > > > > script`. > >> > > > > My > >> > > > > use- > >> > > > > case would be analyzing a perf data file created by perf inject > >> > > > > --sched-stat. > >> > > > > >> > > > I think you can access param_dict["sample"]["period"]. > >> > > > >> > > No, that is not possible, but would be a viable solution as well. > >> > > >> > Sorry for late reply. Oh, you wanted to access period of tracepoint > >> > but I guess it's always 1, no? > >> > >> OK, it seems sched_stat events have periods bigger than 1. But you > >> can access it using 'runtime' or 'delay' field in the event too. I > >> think sample data of tracepoint event is mostly meaningless and you > >> should access to the event fields for useful information. That's why > >> it doesn't provide the info for tracepoint events, I guess. > >> > >> What do you specifically want to know from sample data? > > > > Using `perf inject --sched-stat`, I can get the sched_stat event period to > > the sched_switch event (which has the proper backtrace). That is the data > > I want to access. This is doable when I run: > > > > perf script -F event,period > > > > But it is not accessible from Perl or Python. > > > > Note: the runtime/delay fields are not translated by perf inject, it > > simply > > sets the period which is then used by the other perf tools. > > > > I really think it should be made possible to access that data from Python/ > > Perl. > > As I said, what you really want is 'runtime' or 'delay' and they are > already accessible from scripts. The perf inject uses the period > directly since it knows it's same as the value of the fields but I'm > not sure it's the right way to do. If we don't store it in the event's period field, then we would not be able to use either of the following in `perf report`: --show-total-period -g period I think this would make this feature less intuitive to use, no? > Anyway, if you want to make the period accessible from scripts, you can add it in util/scripting-engines/trace-event-python.c:python_process_tracepoint() > and the perl counterpart. OK, I will provide a patch for that. Would it be OK to simply make the whole sample accessible, just like it already is for non-tracepoint events? 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 --nextPart1496718.XNu2NAFKOW 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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