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

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Date:	Thu, 11 Nov 2010 14:15:45 +0100
From:	Jiri Olsa <jolsa@...hat.com>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	mingo@...e.hu, rostedt@...dmis.org, andi@...stfloor.org,
	lwoodman@...hat.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCHv2 2/2] tracing,mm - add kernel pagefault tracepoint for
 x86 & x86_64

On Thu, Nov 11, 2010 at 07:51:57AM -0500, Christoph Hellwig wrote:
> Can you explain again who this is supposed to be used?  It's missing
> a lot of essential information about the page fault, but on the other
> hand traces totally useless information like the task struct pointer.
> 
> What's your motivation for posting this given that you obviously
> haven't actually tried to use it in practice?
yep, kind of doing this for Larry... hoping he'd fill in to the
discussion ;)

> 
> Btw, this doesn't mean I'm against a page faul trace point - quite
> contrary.  It just seems you're not actually pushing something that's
> been tested in real life or is generally useful.
What would be your idea of the page fault tracepoint?

thanks,
jirka
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