linux-kernel - Re: [PROBLEM] hard-lock with kmemtrace, relayfs, and splice

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Date:	Tue, 14 Oct 2008 00:46:47 -0500
From:	Tom Zanussi <zanussi@...cast.net>
To:	Pekka Enberg <penberg@...helsinki.fi>
Cc:	Eduard - Gabriel Munteanu <eduard.munteanu@...ux360.ro>,
	jens.axboe@...cle.com, linux-kernel@...r.kernel.org
Subject: Re: [PROBLEM] hard-lock with kmemtrace, relayfs, and splice

Hi Pekka,

On Tue, 2008-10-14 at 08:13 +0300, Pekka Enberg wrote:
> Hi Tom,
> 
> Tom Zanussi wrote:
> > To me, that sounds like how it should work - if kmemtrace is disabled,
> > it shouldn't be logging anything, and that's in fact what I saw when
> > debugging this - it started out disabled and therefore nothing being
> > logged to relay (printks confirmed that).  When I wrote 1 to the enabled
> > file, data started getting logged to relay and to the *.out files.
> > 
> > So I don't know why the enabled state behaves the way it does, or if
> > it's unexpected, but that anyway doesn't seem like a relay problem to
> > me.
> 
> Oh, right. Looking at kmemtraced.c, we never enable kmemtrace, just 
> disable it (which doesn't make much sense). Bug in README or the code. 
> Eduard?
> 
> Btw, Tom, you can add my
> 
> Tested-by: Pekka Enberg <penberg@...helsinki.fi>
> 
> to your patch if you want. Are you going to send it to Andrew or do you 
> want me to pick it up with rest of the kmemtrace patches?

If you pick it up that would be fine with me.  Here's my sob:

Signed-off-by: Tom Zanussi <tzanussi@...il.com>

Thanks,

Tom

> 
> 		Pekka

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