linux-kernel - Re: [PATCH] printk: git rid of [sched_delayed] message for printk

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Message-ID: <20140916152046.GC32118@x4>
Date:	Tue, 16 Sep 2014 17:20:46 +0200
From:	Markus Trippelsdorf <markus@...ppelsdorf.de>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Jan Kara <jack@...e.cz>, Geert Uytterhoeven <geert@...ux-m68k.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH] printk: git rid of [sched_delayed] message for
 printk_deferred

On 2014.09.16 at 11:13 -0400, Steven Rostedt wrote:
> On Tue, 16 Sep 2014 16:42:52 +0200
> Markus Trippelsdorf <markus@...ppelsdorf.de> wrote:
> 
> > commit 458df9fd hardcodes printk_deferred() to KERN_WARNING and inserts
> > the string "[sched_delayed] " before the actual message.
> > However it doesn't take into account the KERN_* prefix of the message,
> > that now ends up in the middle of the output:
> > 
> >  [sched_delayed] ^a4CE: hpet increased min_delta_ns to 20115 nsec
> > 
> > Fix this by just getting rid of the "[sched_delayed] " scnprintf().
> 
> I prefer the "[sched_delayed]" output. It lets us know that the output
> did not come out immediately, which is important sometimes during
> debugging. Otherwise it can confuse people, as printk is suppose to be
> a blocking write.
> 
> Can we instead fix the bug instead of nuking the output? That is, move
> the KERN_* prefix before the "[sched_delayed]" message? I don't think
> it would be that hard. If you want, I'll write that patch (probably
> take me 20 minutes at most), but I'm just coming back from medical
> leave so I prefer not to.

I'll leave it to you. This is just a cosmetic issue, so there's no need
to fix this immediately.

-- 
Markus
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