linux-kernel - Re: [PATCHv2 2/2] tracing,mm - add kernel pagefault tracepoint for x86 & x86

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Message-ID: <20101115140632.GI7269@basil.fritz.box>
Date:	Mon, 15 Nov 2010 15:06:33 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Jiri Olsa <jolsa@...hat.com>, mingo@...e.hu, rostedt@...dmis.org,
	andi@...stfloor.org, lwoodman@...hat.com, hch@...radead.org,
	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCHv2 2/2] tracing,mm - add kernel pagefault tracepoint for
 x86 & x86_64

> Actually I don't see any reason right now to trace only kernel faults. Do you?
> If that's needed, one can still check on post-processing that the address
> was in the kernel.

I think the idea is to get more context on oopses. If the event only covers
that the overhead in the common case (minus *_user) is much less,
versus the more generalized points you use.

For tracing the whole page fault me think it's better to have 
a generalized exception tracer with a filter on page fault.

-Andi
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