linux-kernel - Re: [RFC] Create instrumentation directory (git repository)

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Message-ID: <Pine.LNX.4.64.0710291643510.5039@schroedinger.engr.sgi.com>
Date:	Mon, 29 Oct 2007 16:45:42 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
cc:	linux-kernel@...r.kernel.org, Randy Dunlap <rdunlap@...otime.net>,
	Sam Ravnborg <sam@...nborg.org>,
	Jens Axboe <jens.axboe@...cle.com>,
	Prasanna S Panchamukhi <prasanna@...ibm.com>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Anil S Keshavamurthy <anil.s.keshavamurthy@...el.com>,
	"David S. Miller" <davem@...emloft.net>,
	Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <pzijlstr@...hat.com>,
	Philippe Elie <phil.el@...adoo.fr>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"William L. Irwin" <wli@...omorphy.com>,
	Arjan van de Ven <arjan@...radead.org>,
	Christoph Lameter <christoph@...eter.com>
Subject: Re: [RFC] Create instrumentation directory (git repository)

On Mon, 29 Oct 2007, Mathieu Desnoyers wrote:

> * Christoph Lameter (clameter@....com) wrote:
> > On Mon, 29 Oct 2007, Mathieu Desnoyers wrote:
> > 
> > > vm/vmstat.c
> > 
> > The vm statistics are important for the operation of the VM. They are not 
> > optional. So I do not think that they fall under the category of 
> > instrumentation.
> 
> But I guess vm stats can be useful to others; a kernel tracer for
> instance ?

Yes.

> Putting stuff in instrumentation/ by no way means that it becomes
> optional for a subsystem, but merely that it could either export
> information useful for kernel instrumentation or have some
> infrastructure parts merged with others. 

The vm statistics are intricately connected with other mm code. Best leave 
it where it is. The other instrumentation is something that is put in 
particularly for gaining statistics.



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