linux-kernel - Re: more than 50 percent of dmesg belongs only to PCI and USB

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Date:	Mon, 16 Mar 2009 11:59:21 +1100
From:	Michael Ellerman <michael@...erman.id.au>
To:	Greg KH <greg@...ah.com>
Cc:	Jaswinder Singh Rajput <jaswinder@...nel.org>,
	Matthew Wilcox <matthew@....cx>,
	linux-pci <linux-pci@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: more than 50 percent of dmesg belongs only to PCI and USB

On Sun, 2009-03-15 at 17:39 -0700, Greg KH wrote:
> On Mon, Mar 16, 2009 at 10:28:49AM +1100, Michael Ellerman wrote:
> > On Sat, 2009-03-14 at 13:11 +0530, Jaswinder Singh Rajput wrote:
> > > Can we make dmesg little bit better and remove some noise and put these
> > > debug messages on /sys/kernel/debug/ :
> > 
> > I think they should just be KERN_DEBUG, that way they won't be displayed
> > to most users, except people who want to see them.
> > 
> > The problem is it's easier to write:
> > 
> >   dev_info(&dev->dev, "transparent bridge\n");
> > 
> > than:
> > 
> >   dev_printk(KERN_DEBUG, &dev->dev, "transparent bridge\n");
> > 
> > and, dev_dbg() does not do what you want in this case.
> 
> Why not?  It prints it out if you enable the config option at run-time,
> which is what you want.

Only if you have CONFIG_DYNAMIC_PRINTK_DEBUG or whatever it's called
enabled. Which is a terrible idea because it compiles-in all the
pr_debug() and dev_dbg() code that used to be if (0)'ed.

cheers

-- 
Michael Ellerman
OzLabs, IBM Australia Development Lab

wwweb: http://michael.ellerman.id.au
phone: +61 2 6212 1183 (tie line 70 21183)

We do not inherit the earth from our ancestors,
we borrow it from our children. - S.M.A.R.T Person

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