linux-kernel - Re: sched: restore sanity

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Message-ID: <20091220175019.GA19472@elte.hu>
Date:	Sun, 20 Dec 2009 18:50:19 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Joe Perches <joe@...ches.com>, San Mehat <san@...gle.com>,
	Arjan van de Ven <arjan@...radead.org>,
	lkml <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: sched: restore sanity


* Peter Zijlstra <peterz@...radead.org> wrote:

> On Sun, 2009-12-20 at 09:22 -0800, Joe Perches wrote:
> > On Sun, 2009-12-20 at 16:19 +0100, Peter Zijlstra wrote:
> > > On Sun, 2009-12-20 at 07:05 -0800, San Mehat wrote:
> > > > >> Probably, but the rest is just as annoying, pr_* is crap.
> > > > Oh? Out of curiosity whats wrong with it?
> > > That's what should be asked of printk().
> > 
> > pr_<level> offers some things printk cannot:
> > 
> > o standardization, eliminates frequent missing KERN_ levels
> >   and missing/typo/misspelled module prefixes  
> 
> There's other ways of fixing that, one way is to make it a proper
> function argument, like:
> 
> printk(char level, char *fmt, ...);
> 
> Which is something we have precedent for too in fprintf() and syslog().
> 
> > o visually shorter, fewer chars used, less 80 char wrapping
> 
> Fuck me senseless, visually less obvious too.
> 
> > o finer grained ability to eliminate unnecessary messages
> >   for embedded systems
> 
> How is that not possible with another solution.
> 
> > o standardized mechanism to prefix messages with module/function
> 
> Who fucking gives a shit, that is the very thing that made me send the
> revert.
> 
> > o eventual code reduction via use of a singleton instead of
> >   duplicated module/function names
> 
> text reduction?
> 
> > o eventual dynamic_debug styled control of prefix by
> >   module/function
> 
> Feh, who cares, printk output simply shouldn't be frequent enough to
> need filtering, there's much better solutions for that.
> 
> > There are quite of number of arbitrarily named module wrapper
> > macros and functions that build on printk.
> 
> Then remove them all..
> 
> Are you really arguing to fully deprecate printk()? If not this is all
> going to be useless since I'll simply keep using printk().

I dont mind that strongly but you (and Mike) objecting to it so forcefully 
clearly tips the balance against the pr_*() lines in sched.c so i've queued up 
your revert in the scheduler tree.

( I've Cc:-ed Linus and Andrew, in case they care one way or another. )

Thanks,

	Ingo
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