From: Linus Torvalds <torvalds@linux-foundation.org>
To: Mathieu Desnoyers <compudj@krystal.dyndns.org>
Cc: Martin Bligh <mbligh@google.com>,
Peter Zijlstra <peterz@infradead.org>,
Steven Rostedt <rostedt@goodmis.org>,
linux-kernel@vger.kernel.org, Ingo Molnar <mingo@elte.hu>,
Thomas Gleixner <tglx@linutronix.de>,
Andrew Morton <akpm@linux-foundation.org>,
prasad@linux.vnet.ibm.com, "Frank Ch. Eigler" <fche@redhat.com>,
David Wilder <dwilder@us.ibm.com>,
hch@lst.de, Tom Zanussi <zanussi@comcast.net>,
Steven Rostedt <srostedt@redhat.com>
Subject: Re: [RFC PATCH 1/3] Unified trace buffer
Date: Wed, 24 Sep 2008 15:41:06 -0700 (PDT) [thread overview]
Message-ID: <alpine.LFD.1.10.0809241534400.3265@nehalem.linux-foundation.org> (raw)
In-Reply-To: <alpine.LFD.1.10.0809241458270.3265@nehalem.linux-foundation.org>
On Wed, 24 Sep 2008, Linus Torvalds wrote:
>
> - case 1: TSCExtend marker
> data = extended TSC (bits 28..59)
> size = 8
>
> - case 2: TimeStamp marker
> data = tv_nsec
> array[0] = tv_sec
> size = 16
Btw, in case it wasn't clear, those two are totally different things.
The "case 1" thing is the thing that gets inserted automatically by the
trace code when it's needed because the 27-bit TSC is too limited.
The "case 2" thing is to allow us to occasionally synchronize with some
global known wall-time clock like the HPET + xtime. IOW, it would be
something that on demand creates a mapping from wall clock to TSC for that
particular CPU.
I guess I should perhaps have put the TSC frequency in there in that "case
2" thing too. Maybe that should be in "data" (in kHz) and tv_sec/tv_nsec
should be in array[0..1], and the time sync packet would be 24 bytes.
Linus
next prev parent reply other threads:[~2008-09-24 22:43 UTC|newest]
Thread overview: 109+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-09-24 5:10 [RFC PATCH 0/3] An Unified tracing buffer (attempt) Steven Rostedt
2008-09-24 5:10 ` [RFC PATCH 1/3] Unified trace buffer Steven Rostedt
2008-09-24 15:03 ` Peter Zijlstra
2008-09-24 15:44 ` Steven Rostedt
2008-09-25 10:38 ` Ingo Molnar
2008-09-24 15:47 ` Martin Bligh
2008-09-24 16:11 ` Peter Zijlstra
2008-09-24 16:24 ` Linus Torvalds
2008-09-24 16:37 ` Steven Rostedt
2008-09-24 16:56 ` Martin Bligh
2008-09-24 17:25 ` Linus Torvalds
2008-09-24 18:01 ` Mathieu Desnoyers
2008-09-24 20:49 ` Linus Torvalds
2008-09-24 16:26 ` Steven Rostedt
2008-09-24 16:49 ` Martin Bligh
2008-09-24 17:36 ` Linus Torvalds
2008-09-24 17:49 ` Steven Rostedt
2008-09-24 20:23 ` Linus Torvalds
2008-09-24 20:37 ` David Miller
2008-09-24 20:48 ` Steven Rostedt
2008-09-24 20:51 ` Martin Bligh
2008-09-24 21:24 ` Frank Ch. Eigler
2008-09-24 21:33 ` Steven Rostedt
2008-09-24 20:47 ` Steven Rostedt
2008-09-24 21:03 ` Martin Bligh
2008-09-24 21:17 ` Steven Rostedt
2008-09-24 21:51 ` Steven Rostedt
2008-09-25 10:41 ` Peter Zijlstra
2008-09-25 14:33 ` Martin Bligh
2008-09-25 14:53 ` Peter Zijlstra
2008-09-25 15:05 ` Linus Torvalds
2008-09-25 15:25 ` Martin Bligh
2008-09-25 15:36 ` Ingo Molnar
2008-09-25 16:23 ` Mathieu Desnoyers
2008-09-25 16:32 ` Steven Rostedt
2008-09-25 17:20 ` Mathieu Desnoyers
2008-09-25 17:32 ` Steven Rostedt
2008-09-25 16:40 ` Linus Torvalds
2008-09-25 16:53 ` Steven Rostedt
2008-09-25 17:07 ` Linus Torvalds
2008-09-25 19:55 ` Ingo Molnar
2008-09-25 20:12 ` Ingo Molnar
2008-09-25 20:24 ` Linus Torvalds
2008-09-25 20:29 ` Linus Torvalds
2008-09-25 20:47 ` Steven Rostedt
2008-09-25 21:01 ` Steven Rostedt
2008-09-25 21:10 ` Ingo Molnar
2008-09-25 21:16 ` Ingo Molnar
2008-09-25 21:41 ` Ingo Molnar
2008-09-25 21:56 ` Ingo Molnar
2008-09-25 21:58 ` Linus Torvalds
2008-09-25 22:14 ` Ingo Molnar
2008-09-25 23:33 ` Linus Torvalds
2008-09-27 17:16 ` Ingo Molnar
2008-09-27 17:36 ` Ingo Molnar
2008-09-27 17:38 ` Steven Rostedt
2008-09-27 17:50 ` Peter Zijlstra
2008-09-27 18:18 ` Steven Rostedt
2008-09-27 18:42 ` Ingo Molnar
2008-09-25 20:52 ` Ingo Molnar
2008-09-25 21:14 ` Jeremy Fitzhardinge
2008-09-25 21:15 ` Martin Bligh
2008-09-25 20:29 ` Mathieu Desnoyers
2008-09-25 20:20 ` Ingo Molnar
2008-09-25 21:02 ` Jeremy Fitzhardinge
2008-09-25 21:55 ` Linus Torvalds
2008-09-25 22:25 ` Ingo Molnar
2008-09-25 22:45 ` Steven Rostedt
2008-09-25 23:04 ` Jeremy Fitzhardinge
2008-09-25 23:25 ` Ingo Molnar
2008-09-26 14:04 ` Thomas Gleixner
2008-09-25 22:39 ` Jeremy Fitzhardinge
2008-09-25 22:55 ` Ingo Molnar
2008-09-26 1:17 ` Jeremy Fitzhardinge
2008-09-26 1:27 ` Steven Rostedt
2008-09-26 1:49 ` Jeremy Fitzhardinge
2008-09-25 22:59 ` Steven Rostedt
2008-09-26 1:27 ` Jeremy Fitzhardinge
2008-09-26 1:35 ` Steven Rostedt
2008-09-26 2:07 ` Jeremy Fitzhardinge
2008-09-26 2:25 ` Steven Rostedt
2008-09-26 5:31 ` Jeremy Fitzhardinge
2008-09-26 10:41 ` Steven Rostedt
2008-09-25 15:26 ` Steven Rostedt
2008-09-25 17:22 ` Linus Torvalds
2008-09-25 17:39 ` Steven Rostedt
2008-09-25 18:14 ` Linus Torvalds
2008-09-25 15:20 ` Steven Rostedt
2008-09-24 17:54 ` Martin Bligh
2008-09-24 18:04 ` Martin Bligh
2008-09-24 20:39 ` Linus Torvalds
2008-09-24 20:56 ` Martin Bligh
2008-09-24 21:08 ` Steven Rostedt
2008-09-24 20:30 ` Linus Torvalds
2008-09-24 20:53 ` Mathieu Desnoyers
2008-09-24 22:28 ` Linus Torvalds
2008-09-24 22:41 ` Linus Torvalds [this message]
2008-09-25 17:15 ` Mathieu Desnoyers
2008-09-25 17:29 ` Linus Torvalds
2008-09-25 17:42 ` Mathieu Desnoyers
2008-09-25 16:37 ` Mathieu Desnoyers
2008-09-25 16:49 ` Linus Torvalds
2008-09-25 17:02 ` Steven Rostedt
2008-09-24 16:13 ` Mathieu Desnoyers
2008-09-24 16:31 ` Steven Rostedt
2008-09-24 16:39 ` Peter Zijlstra
2008-09-24 16:51 ` Mathieu Desnoyers
2008-09-24 5:10 ` [RFC PATCH 2/3] ftrace: combine some print formating Steven Rostedt
2008-09-24 5:10 ` [RFC PATCH 3/3] ftrace: hack in the ring buffer Steven Rostedt
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