linux-kernel - Re: [PATCH v10 Golden] Unified trace buffer

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Message-ID: <20080930000307.GA2929@Krystal>
Date:	Mon, 29 Sep 2008 20:03:07 -0400
From:	Mathieu Desnoyers <compudj@...stal.dyndns.org>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	prasad@...ux.vnet.ibm.com,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"Frank Ch. Eigler" <fche@...hat.com>,
	David Wilder <dwilder@...ibm.com>, hch@....de,
	Martin Bligh <mbligh@...gle.com>,
	Christoph Hellwig <hch@...radead.org>,
	Masami Hiramatsu <mhiramat@...hat.com>,
	Steven Rostedt <srostedt@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Subject: Re: [PATCH v10 Golden] Unified trace buffer

* Steven Rostedt (rostedt@...dmis.org) wrote:
> 
> On Mon, 29 Sep 2008, Mathieu Desnoyers wrote:
> 
> > * Steven Rostedt (rostedt@...dmis.org) wrote:
> > 
> > You should have a look at mm/slob.c free_slob_page(). I think your page
> > free will generate a "bad_page" call due to mapping != NULL and mapcount
> > != 0. I just ran into this in my own code. :)
> 
> 
> Hi Mathieu!
> 
> Thanks! I must have been lucky some how not to trigger this :-/
> 

My guess is that you never free your buffers in your test cases. I don't
know if it was expected; probably not if your code is built into the
kernel.

Mathieu

> I'll add an update patch for this.
> 
> -- Steve
> 

-- 
Mathieu Desnoyers
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68
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