linux-kernel - Re: [PATCH v2] dma-debug: print some unfreed allocations

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Message-ID: <1305758908.8827.3.camel@jlt3.sipsolutions.net>
Date:	Wed, 18 May 2011 15:48:28 -0700
From:	Johannes Berg <johannes@...solutions.net>
To:	"Roedel, Joerg" <Joerg.Roedel@....com>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>,
	David Woodhouse <dwmw2@...radead.org>
Subject: Re: [PATCH v2] dma-debug: print some unfreed allocations

On Mon, 2011-05-16 at 13:00 +0200, Roedel, Joerg wrote:
> > +		/*
> > +		 * If we have, print out some stack traces for the allocations.
> > +		 * In case of module unload, the stack traces will be useless,
> > +		 * but instead of unloading the module you can manually unbind
> > +		 * the driver instead and get useful traces.
> > +		 */
> > +		printk(KERN_WARNING "Showing traces for %d allocations:\n",
> > +		       DMA_DEBUG_NUM_PRINT_UNFREED);

> This is surely useful to developers, but can trash the dmesg if done
> unconditionally. I would prefer this verbose output to be configurable
> and off by default.

Are you thinking of runtime or compile time configuration? Kconfig entry
depending on stacktrace (or selecting it, depending on have_stacktrace)
would be easy enough.

johannes

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