linux-kernel - Re: [PATCH] Linux Kernel Markers 0.5 for Linux 2.6.17 (with probe management)

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Message-ID: <20060921214914.GA31303@Krystal>
Date:	Thu, 21 Sep 2006 17:49:14 -0400
From:	Mathieu Desnoyers <compudj@...stal.dyndns.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Martin Bligh <mbligh@...gle.com>,
	"Frank Ch. Eigler" <fche@...hat.com>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	prasanna@...ibm.com, Andrew Morton <akpm@...l.org>,
	Paul Mundt <lethal@...ux-sh.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Jes Sorensen <jes@....com>, Tom Zanussi <zanussi@...ibm.com>,
	Richard J Moore <richardj_moore@...ibm.com>,
	Michel Dagenais <michel.dagenais@...ymtl.ca>,
	Christoph Hellwig <hch@...radead.org>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Thomas Gleixner <tglx@...utronix.de>,
	William Cohen <wcohen@...hat.com>, ltt-dev@...fik.org,
	systemtap@...rces.redhat.com, Alan Cox <alan@...rguk.ukuu.org.uk>
Subject: Re: [PATCH] Linux Kernel Markers 0.5 for Linux 2.6.17 (with probe management)

* Mathieu Desnoyers (compudj@...stal.dyndns.org) wrote:
> * Ingo Molnar (mingo@...e.hu) wrote:
>  
> >   "As an example, LTTng traces the page fault handler, when kprobes just
> >    can't instrument it."
> > 
> > but tracing a raw pagefault at the arch level is a bad idea anyway, we 
> > want to trace __handle_mm_fault(). That way you can avoid having to 
> > modify every architecture's pagefault handler ...
> > 
> 
> Then you lose the ability to trace in-kernel minor page faults.
> 
But I agree with you that an upstream MARKER makes more sense in
__handle_mm_fault(). :-)

Regards,

Mathieu

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