Date: Thu, 24 Feb 2005 15:00:26 -0800
From: Andrew Morton <akpm@osdl.org>
To: "Chad N. Tindel" <chad@tindel.net>
Cc: helge.hafting@aitel.hist.no, linux-kernel@vger.kernel.org
Subject: Re: Xterm Hangs - Possible scheduler defect?
Message-Id: <20050224150026.69b1862f.akpm@osdl.org>
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"Chad N. Tindel" <chad@tindel.net> wrote:
>
>  I would make the following assertion for any kernel:
> 
>  No single userspace thread of execution running on an SMP system should be 
>  able to hose a box by going CPU-bound, bug in the software or no bug.

But if we were to enforce that policy, realtime policy would become less
useful.  You havn't even acknowledged that such a tradeoff exists, let
alone demonstrated that we're on the wrong side of it.

Here's a quicky which will convert all your kernel threads to SCHED_RR,
priority 99.  Please test.

#!/bin/sh

PIDS=$(ps axo pid,command | grep ' \[.*\]$' | sed -e 's/ \[.*\]$//')

for i in $PIDS
do
	chrt -r 99 -9 $i
done

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