linux-kernel - Re: [PATCH 0/4 v6] Avoid softlockups in console

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Message-Id: <20130823125822.b3f5b946ef1e86c52834d0c3@linux-foundation.org>
Date:	Fri, 23 Aug 2013 12:58:22 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Jiri Kosina <jkosina@...e.cz>
Cc:	Jan Kara <jack@...e.cz>, LKML <linux-kernel@...r.kernel.org>,
	mhocko@...e.cz, hare@...e.de, Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [PATCH 0/4 v6] Avoid softlockups in console_unlock()

On Fri, 23 Aug 2013 21:48:36 +0200 (CEST) Jiri Kosina <jkosina@...e.cz> wrote:

> > >   We have customers (quite a few of them actually) which have machines with
> > > lots of SCSI disks attached (due to multipath etc.) and during boot when
> > > these disks are discovered and partitions set up quite some printing
> > > happens - multiplied by the number of devices (1000+) it is too much for a
> > > serial console to handle quickly enough. So these machines aren't able to
> > > boot with serial console enabled.
> > 
> > It sounds like rather a corner case, not worth mucking up the critical
> > core logging code.
> 
> Andrew, I have to admit I don't understand this argument at all.

Of course you do.  print should be simple, robust and have minimum
dependency on other kernel parts.

I suppose that if you make the proposed
/proc/sys/kernel/max_printk_chars settable from the boot command line
and default to zero, any risks are minimized.

Baling out if oops_in_progress was a good thing also.
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