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

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Date:	Tue, 14 Oct 2008 10:30:33 +0300
From:	Eduard - Gabriel Munteanu <eduard.munteanu@...ux360.ro>
To:	Tom Zanussi <zanussi@...cast.net>
Cc:	Pekka Enberg <penberg@...helsinki.fi>, jens.axboe@...cle.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PROBLEM] hard-lock with kmemtrace, relayfs, and splice

On Tue, Oct 14, 2008 at 12:46:47AM -0500, Tom Zanussi wrote:
> 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
>

Great, this makes it go swifter. I'll commit the change to
kmemtrace-user.


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