From: Martin Bligh <mbligh@mbligh.org>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: "Frank Ch. Eigler" <fche@redhat.com>, Ingo Molnar <mingo@elte.hu>,
Paul Mundt <lethal@linux-sh.org>,
Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>,
linux-kernel <linux-kernel@vger.kernel.org>,
Jes Sorensen <jes@sgi.com>, Andrew Morton <akpm@osdl.org>,
Tom Zanussi <zanussi@us.ibm.com>,
Richard J Moore <richardj_moore@uk.ibm.com>,
Michel Dagenais <michel.dagenais@polymtl.ca>,
Christoph Hellwig <hch@infradead.org>,
Greg Kroah-Hartman <gregkh@suse.de>,
Thomas Gleixner <tglx@linutronix.de>,
William Cohen <wcohen@redhat.com>
Subject: Re: tracepoint maintainance models
Date: Mon, 18 Sep 2006 10:54:35 -0700 [thread overview]
Message-ID: <450EDD5B.907@mbligh.org> (raw)
In-Reply-To: <1158602662.6069.147.camel@localhost.localdomain>
Alan Cox wrote:
> Ar Llu, 2006-09-18 am 13:27 -0400, ysgrifennodd Frank Ch. Eigler:
>
>>Unless one's worried about planetary-scale energy use, I see no point
>>in multiplying overheads by "every box on the planet".
>
>
> Because we are all paying for your debug stuff we aren't using. Systems
> get slow and sucky by the death of a million cuts not by one stupid
> action.
Bear in mind that it could be CONFIG'ed out, so you can still do as you
choose. But for many people, the ability to get insight into their
application's interaction with the kernel and get several % performance
improvement by understanding their environment will outweigh the 0.01%
overhead of a few nops.
IME, most performance problems are not little tiny instruction-cycle
level things, they're huge sucking wounds that people just don't know
how to fix, or that they even exist (such as "oops, I single-threaded
all my IO from my app").
M.
next prev parent reply other threads:[~2006-09-18 17:54 UTC|newest]
Thread overview: 82+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-09-17 9:40 The emperor is naked: why *comprehensive* static markup belongs in mainline Karim Yaghmour
2006-09-17 11:21 ` Paul Mundt
2006-09-17 14:36 ` tracepoint maintainance models Ingo Molnar
2006-09-17 15:02 ` Roman Zippel
2006-09-17 15:09 ` Ingo Molnar
2006-09-17 17:18 ` Roman Zippel
2006-09-17 23:27 ` Ingo Molnar
2006-09-17 23:41 ` Ingo Molnar
2006-09-18 0:17 ` Roman Zippel
2006-09-18 9:01 ` Jes Sorensen
2006-09-17 20:37 ` Roman Zippel
2006-09-17 22:34 ` Ingo Molnar
2006-09-17 15:36 ` Mathieu Desnoyers
2006-09-18 0:07 ` Ingo Molnar
2006-09-18 1:12 ` Karim Yaghmour
2006-09-18 1:13 ` Ingo Molnar
2006-09-18 2:32 ` Karim Yaghmour
2006-09-18 2:57 ` Ingo Molnar
2006-09-18 3:54 ` Karim Yaghmour
2006-09-18 4:09 ` Ingo Molnar
2006-09-18 4:43 ` Karim Yaghmour
2006-09-18 2:43 ` Mathieu Desnoyers
2006-09-18 3:21 ` Ingo Molnar
2006-09-18 4:26 ` Mathieu Desnoyers
2006-09-18 5:08 ` Ingo Molnar
2006-09-18 12:25 ` Frank Ch. Eigler
2006-09-18 15:02 ` Ingo Molnar
2006-09-18 15:45 ` Mathieu Desnoyers
2006-09-18 15:48 ` Alan Cox
2006-09-18 15:22 ` Ingo Molnar
2006-09-18 16:19 ` Alan Cox
2006-09-18 16:15 ` Ingo Molnar
2006-09-18 17:02 ` Alan Cox
2006-09-18 16:15 ` Frank Ch. Eigler
2006-09-18 17:02 ` Alan Cox
2006-09-18 17:27 ` Frank Ch. Eigler
2006-09-18 18:04 ` Alan Cox
2006-09-18 17:54 ` Martin Bligh [this message]
2006-09-18 18:05 ` Frank Ch. Eigler
2006-09-18 19:10 ` Vara Prasad
2006-09-18 19:49 ` Alan Cox
2006-09-18 19:39 ` Frank Ch. Eigler
2006-09-18 20:28 ` Vara Prasad
2006-10-06 5:33 ` Steven Rostedt
2006-10-06 13:01 ` Frank Ch. Eigler
2006-10-06 14:23 ` Steven Rostedt
2006-10-06 23:17 ` Jeremy Fitzhardinge
2006-09-18 15:47 ` Frank Ch. Eigler
2006-09-18 15:42 ` Ingo Molnar
2006-09-18 16:30 ` MARKER mechanism, try 2 Mathieu Desnoyers
2006-09-18 16:28 ` Ingo Molnar
2006-09-18 17:47 ` Mathieu Desnoyers
2006-09-18 19:39 ` Alan Cox
2006-09-17 20:19 ` tracepoint maintainance models Nicholas Miell
2006-09-17 23:06 ` Ingo Molnar
2006-09-18 0:05 ` Roman Zippel
2006-09-18 1:52 ` Theodore Tso
2006-09-19 12:58 ` tracing - consensus building insteat of dogfights Christoph Hellwig
2006-09-19 13:25 ` Roman Zippel
2006-09-19 13:45 ` Karim Yaghmour
2006-09-19 14:25 ` Karim Yaghmour
2006-09-18 0:10 ` tracepoint maintainance models Nicholas Miell
2006-09-18 0:43 ` Roman Zippel
2006-09-18 0:56 ` Karim Yaghmour
2006-09-18 0:56 ` Ingo Molnar
2006-09-18 2:09 ` Karim Yaghmour
2006-09-18 3:30 ` Ingo Molnar
2006-09-18 3:52 ` Theodore Tso
2006-09-18 4:11 ` Ingo Molnar
2006-09-18 4:24 ` Karim Yaghmour
2006-09-18 4:32 ` Ingo Molnar
2006-09-18 5:03 ` LTTng and SystemTAP (Everyone who is scared to read this huge thread, skip to here) Mathieu Desnoyers
2006-09-18 15:11 ` Ingo Molnar
2006-09-23 15:50 ` Mathieu Desnoyers
2006-09-18 5:37 ` tracepoint maintainance models Karim Yaghmour
2006-09-18 20:12 ` Michel Dagenais
2006-09-18 4:14 ` Karim Yaghmour
2006-09-18 4:09 ` Ingo Molnar
2006-09-18 4:57 ` Karim Yaghmour
2006-09-18 1:03 ` The emperor is naked: why *comprehensive* static markup belongs in mainline Karim Yaghmour
2006-09-18 15:53 ` Jose R. Santos
2006-09-18 17:28 ` Karim Yaghmour
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