linux-kernel - Re: [git pull] latency tracer

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Message-ID: <20080209073756.GA13141@elte.hu>
Date:	Sat, 9 Feb 2008 08:37:56 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [git pull] latency tracer


* Andrew Morton <akpm@...ux-foundation.org> wrote:

> On Fri, 8 Feb 2008 22:45:22 +0100 Ingo Molnar <mingo@...e.hu> wrote:
> 
> > Linus, please pull the latency tracer tree from:
> > 
> >    git://git.kernel.org/pub/scm/linux/kernel/git/mingo/linux-2.6-sched.git
> > 
> > Find the shortlog below.
> > 
> > This is the latency tracer from -rt
> 
> I've never seen any of this code before and googling several of the 
> patch titles turns up this email and nothing else.

there might be some confusion here. Google for "mcount tracing utility" 
- there's 2270 hits. There's been 8 full series posted to lkml in the 
past month:

 Date: Thu, 03 Jan 2008 02:16:09 -0500
 Subject: [RFC PATCH 00/11] mcount tracing utility

 Date: Wed, 09 Jan 2008 18:29:14 -0500
 Subject: [RFC PATCH 00/22 -v2] mcount and latency tracing utility -v2

 Date: Tue, 15 Jan 2008 15:49:07 -0500
 Subject: [RFC PATCH 00/30 v3] mcount and latency tracing utility -v3

 Date: Mon, 21 Jan 2008 10:22:31 -0500
 Subject: [RFC PATCH 00/23 -v4] mcount and latency tracing utility -v4

 Date: Wed, 23 Jan 2008 11:02:36 -0500
 Subject: [PATCH 00/20 -v5] mcount and latency tracing utility -v5

 Date: Fri, 25 Jan 2008 23:21:52 -0500
 Subject: [PATCH 00/23 -v6] mcount and latency tracing utility -v6

 Date: Tue, 29 Jan 2008 22:15:21 -0500
 Subject: [PATCH 00/22 -v7] mcount and latency tracing utility -v7

 Date: Wed, 30 Jan 2008 16:03:57 -0500
 Subject: [PATCH 00/23 -v8] mcount and latency tracing utility -v8

it derives from the same latency tracer code that we wrote for -rt that 
has been around for years:

   http://people.redhat.com/mingo/latency-tracing-patches/

we renamed the concept to 'ftrace' during pre-merge cleanups, perhaps 
that is what caused you to not recognize this? (mcount is a confusing 
name and ties it to a gcc feature while there's nothing gcc specific 
about this concept.)

	Ingo
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