linux-kernel - Re: [PATCH 3/4] printk: Defer printing to irq work when we printed too much

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Message-ID: <20131107175937.37c224bb@gandalf.local.home>
Date:	Thu, 7 Nov 2013 17:59:37 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Jan Kara <jack@...e.cz>, Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Michal Hocko <mhocko@...e.cz>
Subject: Re: [PATCH 3/4] printk: Defer printing to irq work when we printed
 too much

On Thu, 7 Nov 2013 23:43:52 +0100
Frederic Weisbecker <fweisbec@...il.com> wrote:


> When a message takes tens of seconds to be printed, it usually means
> we are in trouble somehow :)
> I wonder what printk source can trigger such a high volume.

The only ones that I'm aware of is the prints from sysrq. Which
includes a ftrace_dump as well. These have caused issues in the past,
but usually I do them on boxes that I reboot afterward anyway.

-- Steve
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