linux-kernel - Re: Serial port blues

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Date:	Sun, 21 Jan 2007 15:04:21 +0100
From:	Johannes Stezenbach <js@...uxtv.org>
To:	Willy Tarreau <w@....eu>
Cc:	Theodore Tso <tytso@....edu>, Joe Barr <joe@...rimer.com>,
	Linux Kernel mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Serial port blues

On Sun, Jan 21, 2007 at 08:05:57AM +0100, Willy Tarreau wrote:
> On Sun, Jan 21, 2007 at 12:54:56AM -0500, Theodore Tso wrote:
> > On Sat, Jan 20, 2007 at 06:36:44PM +0100, Willy Tarreau wrote:
> > 
> > > Now he must be careful about avoiding busy loops in the rest of the
> > > program, or he will have to use the reset button.
> > 
> > An easy way of dealing with this is to have an sshd running
> > an alternative port running at a nice high priority (say, prio 95 or
> > so).  That way, if you screw up, you can always login remotely and
> > kill the offending program.
> >
> > There is also a RT Watchdog program which can be found on
> > rt.wiki.kernel.org which can be used to recover from runaway real-time
> > processes without needing to hit the reset button.
> 
> Thanks for those hints, I've been used to play with the reset button,
> at least it has forced me to double check my code before running it :-)

I think SysRq-N sets all processes with RT-priority to non-RT.


Johannes
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