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

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Message-ID: <alpine.LNX.2.00.1308232146250.25124@deuxcents.site>
Date:	Fri, 23 Aug 2013 21:48:36 +0200 (CEST)
From:	Jiri Kosina <jkosina@...e.cz>
To:	Andrew Morton <akpm@...ux-foundation.org>
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 Thu, 22 Aug 2013, Andrew Morton 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. Do you 
feel comfortable having the code in the kernel that can be spinning for 
tenths of seconds with interrupts disabled? As that's the exact 
description of the current printk().

I feel very uncomfortable having a core kernel logging facility having 
such property.

-- 
Jiri Kosina
SUSE Labs
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