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From: Pawel Moll <pawel.moll@arm.com>
To: Stephane Eranian <eranian@google.com>
Cc: Peter Zijlstra <peterz@infradead.org>,
	LKML <linux-kernel@vger.kernel.org>,
	"mingo@elte.hu" <mingo@elte.hu>,
	Paul Mackerras <paulus@samba.org>,
	Anton Blanchard <anton@samba.org>,
	Will Deacon <Will.Deacon@arm.com>,
	"ak@linux.intel.com" <ak@linux.intel.com>,
	Pekka Enberg <penberg@gmail.com>,
	Steven Rostedt <rostedt@goodmis.org>,
	Robert Richter <robert.richter@amd.com>,
	tglx <tglx@linutronix.de>, John Stultz <john.stultz@linaro.org>
Subject: Re: [RFC] perf: need to expose sched_clock to correlate user samples with kernel samples
Date: Wed, 06 Feb 2013 18:17:42 +0000	[thread overview]
Message-ID: <1360174662.4045.34.camel@hornet> (raw)
In-Reply-To: <CABPqkBSVeU_JP2KpVZLepKDJX=-g6A45Y5MoNphd6+DaU2PQzQ@mail.gmail.com>

On Tue, 2013-02-05 at 22:13 +0000, Stephane Eranian wrote:
> The app requesting the timestamp may not necessarily have an active
> perf session. And by that I mean, it may not be self-monitoring. But it
> could be monitored by an external tool such as perf, without necessary
> knowing it.

Fair enough - I guess eg. JIT engine could generate a timestamped
information about generated symbols which could be then merged with a
stream recorded by the perf tool by yet another tool.

> The timestamp is global or at least per-cpu. It is not tied to a particular
> active event.

I know that the implementation does it now, but is it actually specified
as such? I could imagine a situation where perf_clock() returns time
elapsed since the "current" sys_perf_event_open()... (not that I'd like
it ;-)

Paweł



  parent reply	other threads:[~2013-02-06 18:17 UTC|newest]

Thread overview: 65+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-10-16 10:13 [RFC] perf: need to expose sched_clock to correlate user samples with kernel samples Stephane Eranian
2012-10-16 17:23 ` Peter Zijlstra
2012-10-18 19:33   ` Stephane Eranian
2012-11-10  2:04   ` John Stultz
2012-11-11 20:32     ` Stephane Eranian
2012-11-12 18:53       ` John Stultz
2012-11-12 20:54         ` Stephane Eranian
2012-11-12 22:39           ` John Stultz
2012-11-13 20:58     ` Steven Rostedt
2012-11-14 22:26       ` John Stultz
2012-11-14 23:30         ` Steven Rostedt
2013-02-01 14:18   ` Pawel Moll
2013-02-05 21:18     ` David Ahern
2013-02-05 22:13     ` Stephane Eranian
2013-02-05 22:28       ` John Stultz
2013-02-06  1:19         ` Steven Rostedt
2013-02-06 18:17           ` Pawel Moll
2013-02-13 20:00             ` Stephane Eranian
2013-02-14 10:33               ` Pawel Moll
2013-02-18 15:16                 ` Stephane Eranian
2013-02-18 18:59                   ` David Ahern
2013-02-18 20:35         ` Thomas Gleixner
2013-02-19 18:25           ` John Stultz
2013-02-19 19:55             ` Thomas Gleixner
2013-02-19 20:15               ` Thomas Gleixner
2013-02-19 20:35                 ` John Stultz
2013-02-19 21:50                   ` Thomas Gleixner
2013-02-19 22:20                     ` John Stultz
2013-02-20 10:06                       ` Thomas Gleixner
2013-02-20 10:29             ` Peter Zijlstra
2013-02-23  6:04               ` John Stultz
2013-02-25 14:10                 ` Peter Zijlstra
2013-03-14 15:34                   ` Stephane Eranian
2013-03-14 19:57                     ` Pawel Moll
2013-03-31 16:23                       ` David Ahern
2013-04-01 18:29                         ` John Stultz
2013-04-01 22:29                           ` David Ahern
2013-04-01 23:12                             ` John Stultz
2013-04-03  9:17                             ` Stephane Eranian
2013-04-03 13:55                               ` David Ahern
2013-04-03 14:00                                 ` Stephane Eranian
2013-04-03 14:14                                   ` David Ahern
2013-04-03 14:22                                     ` Stephane Eranian
2013-04-03 17:57                                       ` John Stultz
2013-04-04  8:12                                         ` Stephane Eranian
2013-04-04 22:26                                           ` John Stultz
2013-04-02  7:54                           ` Peter Zijlstra
2013-04-02 16:05                             ` Pawel Moll
2013-04-02 16:19                             ` John Stultz
2013-04-02 16:34                               ` Pawel Moll
2013-04-03 17:19                               ` Pawel Moll
2013-04-03 17:29                                 ` John Stultz
2013-04-03 17:35                                   ` Pawel Moll
2013-04-03 17:50                                     ` John Stultz
2013-04-04  7:37                                       ` Richard Cochran
2013-04-04 16:33                                         ` Pawel Moll
2013-04-04 16:29                                       ` Pawel Moll
2013-04-05 18:16                                         ` Pawel Moll
2013-04-06 11:05                                           ` Richard Cochran
2013-04-08 17:58                                             ` Pawel Moll
2013-04-08 19:05                                               ` John Stultz
2013-04-09  5:02                                                 ` Richard Cochran
2013-02-06 18:17       ` Pawel Moll [this message]
2013-06-26 16:49     ` David Ahern
2013-07-15 10:44       ` Pawel Moll

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