linux-kernel - Re: [PATCH] serial8250: ratelimit "too much work" error

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Message-ID: <20101002152229.5f0f957b@lxorguk.ukuu.org.uk>
Date:	Sat, 2 Oct 2010 15:22:29 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Daniel Drake <dsd@...top.org>
Cc:	akpm@...ux-foundation.org, linux-serial@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] serial8250: ratelimit "too much work" error

On Sat,  2 Oct 2010 12:04:38 +0100 (BST)
Daniel Drake <dsd@...top.org> wrote:

> Running a serial console, if too many kernel messages are generated within
> a short time causing a lot of serial I/O, the 8250 driver will generate
> another kernel message reporting this, which just adds to the I/O. It has
> a cascading effect and quickly results the system being brought to its knees
> by a flood of "too much work" messages.
> 
> Ratelimit the error message to avoid this.
> 
> Signed-off-by: Daniel Drake <dsd@...top.org>

Acked-by: Alan Cox <alan@...ux.intel.com>

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