From: Steven Rostedt <rostedt@goodmis.org>
To: John Stultz <john.stultz@linaro.org>
Cc: Stephane Eranian <eranian@google.com>,
Pawel Moll <pawel.moll@arm.com>,
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>,
Robert Richter <robert.richter@amd.com>,
tglx <tglx@linutronix.de>
Subject: Re: [RFC] perf: need to expose sched_clock to correlate user samples with kernel samples
Date: Tue, 05 Feb 2013 20:19:55 -0500 [thread overview]
Message-ID: <1360113595.2621.30.camel@gandalf.local.home> (raw)
In-Reply-To: <51118797.9080800@linaro.org>
On Tue, 2013-02-05 at 14:28 -0800, John Stultz wrote:
> I prefer the ioctl method, since its less likely to be re-purposed/misused.
>
> Though I'd be most comfortable with finding some way for perf-timestamps
> to be CLOCK_MONOTONIC based (or maybe CLOCK_MONOTONIC_RAW if it would be
> easier), and just avoid all together adding another time domain that
> doesn't really have clear definition (other then "what perf uses").
Perhaps add a new perf system call? Does everything need to go through
the one great mighty perf_ioctl aka sys_perf_event_open()? I mean, if
there's something that can be agnostic to an event, but still very much
related to perf, perhaps another perf syscall should be created.
If people are worried about adding a bunch of new perf syscalls, maybe
add a sys_perf_control() system call that works like an ioctl but
without a file descriptor. Something for things that don't require an
event attached to it, like to retrieve a time stamp counter that perf
uses, but done in a way that it could be used for other things perf
related that does not require an event.
-- Steve
next prev parent reply other threads:[~2013-02-06 1:19 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 [this message]
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
2013-06-26 16:49 ` David Ahern
2013-07-15 10:44 ` Pawel Moll
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