From: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
To: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: "Frank Ch. Eigler" <fche@redhat.com>,
Steven Rostedt <rostedt@goodmis.org>,
LKML <linux-kernel@vger.kernel.org>, Ingo Molnar <mingo@elte.hu>,
Linus Torvalds <torvalds@linux-foundation.org>,
Andrew Morton <akpm@linux-foundation.org>,
Christoph Hellwig <hch@infradead.org>,
Gregory Haskins <ghaskins@novell.com>,
Arnaldo Carvalho de Melo <acme@ghostprotocols.net>,
Thomas Gleixner <tglx@linutronix.de>,
Tim Bird <tim.bird@am.sony.com>, Sam Ravnborg <sam@ravnborg.org>,
Jan Kiszka <jan.kiszka@siemens.com>,
John Stultz <johnstul@us.ibm.com>,
Arjan van de Ven <arjan@infradead.org>,
Steven Rostedt <srostedt@redhat.com>
Subject: Re: [PATCH 19/20 -v5] Trace irq disabled critical timings
Date: Wed, 23 Jan 2008 16:29:33 -0500 [thread overview]
Message-ID: <20080123212933.GA2282@Krystal> (raw)
In-Reply-To: <1201111103.6341.73.camel@lappy>
* Peter Zijlstra (a.p.zijlstra@chello.nl) wrote:
>
> On Wed, 2008-01-23 at 12:27 -0500, Frank Ch. Eigler wrote:
> > Hi -
> >
> > On Wed, Jan 23, 2008 at 12:11:07PM -0500, Steven Rostedt wrote:
> > > This patch adds latency tracing for critical timings
> > > (how long interrupts are disabled for).
> > > [...]
> >
> > Is there an opportunity here to share effort with latencytop, and
> > ideally to use markers as much as possible for these event hooks?
>
> I'm still thinking latencytop should only record stack traces and do the
> rest in user-space.
>
> Also, the things the latency tracer and latecytop measure are quite
> different. the latency tracer measures how long a non-schedulable
> section is, latencytop measures how a task was scheduled away.
Hrm, if it's really the only thing latencytop is doing.. ever thought
about trying LTTng ? ;) A simple plugin could be written in lttv to
perform this kind of analysis.
Mathieu
>
--
Mathieu Desnoyers
Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F BA06 3F25 A8FE 3BAE 9A68
next prev parent reply other threads:[~2008-01-23 21:29 UTC|newest]
Thread overview: 54+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-01-23 16:02 [PATCH 00/20 -v5] mcount and latency tracing utility -v5 Steven Rostedt
2008-01-23 16:02 ` [PATCH 01/20 -v5] printk - dont wakeup klogd with interrupts disabled Steven Rostedt
2008-01-23 17:06 ` Daniel Walker
2008-01-23 17:25 ` Mathieu Desnoyers
2008-01-23 17:49 ` Tim Bird
2008-01-24 10:35 ` Pavel Machek
2008-01-23 17:27 ` Steven Rostedt
2008-01-23 17:32 ` Mathieu Desnoyers
2008-01-23 17:43 ` Daniel Walker
2008-01-23 18:18 ` Steven Rostedt
2008-01-23 18:28 ` Daniel Walker
2008-01-23 18:43 ` Steven Rostedt
2008-01-23 18:50 ` Daniel Walker
2008-01-23 19:59 ` Daniel Walker
2008-01-24 22:42 ` [PATCH] defer printks in irqs Tim Bird
2008-01-24 22:48 ` Peter Zijlstra
2008-01-24 23:23 ` Tim Bird
2008-01-27 6:01 ` Andrew Morton
2008-01-28 21:14 ` Tim Bird
2008-01-24 10:36 ` [PATCH 01/20 -v5] printk - dont wakeup klogd with interrupts disabled Pavel Machek
2008-01-23 16:02 ` [PATCH 02/20 -v5] Add basic support for gcc profiler instrumentation Steven Rostedt
2008-01-23 16:02 ` [PATCH 03/20 -v5] Annotate core code that should not be traced Steven Rostedt
2008-01-23 16:02 ` [PATCH 04/20 -v5] x86_64: notrace annotations Steven Rostedt
2008-01-23 16:02 ` [PATCH 05/20 -v5] add notrace annotations to vsyscall Steven Rostedt
2008-01-23 16:02 ` [PATCH 06/20 -v5] add notrace annotations for NMI routines Steven Rostedt
2008-01-23 21:31 ` Mathieu Desnoyers
2008-01-23 21:58 ` Steven Rostedt
2008-01-26 5:25 ` Steven Rostedt
2008-01-28 11:51 ` Jan Kiszka
2008-01-28 12:15 ` Steven Rostedt
2008-01-23 16:02 ` [PATCH 07/20 -v5] handle accurate time keeping over long delays Steven Rostedt
2008-01-23 16:02 ` [PATCH 08/20 -v5] initialize the clock source to jiffies clock Steven Rostedt
2008-01-23 16:40 ` Tim Bird
2008-01-23 16:02 ` [PATCH 09/20 -v5] add get_monotonic_cycles Steven Rostedt
2008-01-23 16:02 ` [PATCH 10/20 -v5] add notrace annotations to timing events Steven Rostedt
2008-01-23 16:02 ` [PATCH 11/20 -v5] mcount based trace in the form of a header file library Steven Rostedt
2008-01-23 16:02 ` [PATCH 12/20 -v5] Add context switch marker to sched.c Steven Rostedt
2008-01-23 16:02 ` [PATCH 13/20 -v5] Make the task State char-string visible to all Steven Rostedt
2008-01-23 16:02 ` [PATCH 14/20 -v5] Add tracing of context switches Steven Rostedt
2008-01-23 16:02 ` [PATCH 15/20 -v5] Generic command line storage Steven Rostedt
2008-01-23 16:02 ` [PATCH 16/20 -v5] trace generic call to schedule switch Steven Rostedt
2008-01-23 16:02 ` [PATCH 17/20 -v5] Add marker in try_to_wake_up Steven Rostedt
2008-01-23 16:02 ` [PATCH 18/20 -v5] mcount tracer for wakeup latency timings Steven Rostedt
2008-01-23 16:02 ` [PATCH 19/20 -v5] Trace irq disabled critical timings Steven Rostedt
2008-01-23 16:53 ` Steven Rostedt
2008-01-23 17:11 ` Steven Rostedt
2008-01-23 17:27 ` Frank Ch. Eigler
2008-01-23 17:45 ` Steven Rostedt
2008-01-23 17:54 ` Mathieu Desnoyers
2008-01-23 17:58 ` Peter Zijlstra
2008-01-23 18:25 ` Frank Ch. Eigler
2008-01-23 18:48 ` Steven Rostedt
2008-01-23 21:29 ` Mathieu Desnoyers [this message]
2008-01-23 16:02 ` [PATCH 20/20 -v5] trace preempt off " Steven Rostedt
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