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Re: [PATCH] Linux Kernel Markers 0.5 for Linux 2.6.17 (with probe management)
- From: Mathieu Desnoyers <compudj at krystal dot dyndns dot org>
- To: Ingo Molnar <mingo at elte dot hu>
- Cc: Martin Bligh <mbligh at google dot com>, "Frank Ch. Eigler" <fche at redhat dot com>, Masami Hiramatsu <masami dot hiramatsu dot pt at hitachi dot com>, prasanna at in dot ibm dot com, Andrew Morton <akpm at osdl dot org>, Paul Mundt <lethal at linux-sh dot org>, linux-kernel <linux-kernel at vger dot kernel dot org>, Jes Sorensen <jes at sgi dot com>, Tom Zanussi <zanussi at us dot ibm dot com>, Richard J Moore <richardj_moore at uk dot ibm dot com>, Michel Dagenais <michel dot dagenais at polymtl dot ca>, Christoph Hellwig <hch at infradead dot org>, Greg Kroah-Hartman <gregkh at suse dot de>, Thomas Gleixner <tglx at linutronix dot de>, William Cohen <wcohen at redhat dot com>, ltt-dev at shafik dot org, systemtap at sources dot redhat dot com, Alan Cox <alan at lxorguk dot ukuu dot org dot uk>
- Date: Thu, 21 Sep 2006 17:49:14 -0400
- Subject: Re: [PATCH] Linux Kernel Markers 0.5 for Linux 2.6.17 (with probe management)
- References: <20060921160009.GA30115@Krystal> <20060921160656.GA24774@elte.hu> <20060921214248.GA10097@Krystal>
* Mathieu Desnoyers (compudj@krystal.dyndns.org) wrote:
> * Ingo Molnar (mingo@elte.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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