linux-kernel - Re: Forward port of latest RT patch (2.6.21.5-rt20) to 2.6.22 available

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Message-ID: <46981855.8040904@bigpond.net.au>
Date:	Sat, 14 Jul 2007 10:27:01 +1000
From:	Peter Williams <pwil3058@...pond.net.au>
To:	Gene Heskett <gene.heskett@...il.com>
CC:	Ingo Molnar <mingo@...e.hu>, Gregory Haskins <ghaskins@...ell.com>,
	jim.houston@...r.com, joe.korty@...r.com, rostedt@...dmis.org,
	tglx@...utronix.de, dwalker@...sta.com,
	David Bahi <DBahi@...ell.com>,
	Moiz Kohari <MKohari@...ell.com>,
	Sven Dietrich <SDietrich@...ell.com>, dsaxena@...xity.net,
	williams@...hat.com, abogani@...ware.it,
	linux-kernel@...r.kernel.org, linux-rt-users@...r.kernel.org
Subject: Re: Forward port of latest RT patch (2.6.21.5-rt20) to 2.6.22 available

Gene Heskett wrote:
> On Friday 13 July 2007, Peter Williams wrote:
>> Ingo Molnar wrote:
>>> * Gregory Haskins <ghaskins@...ell.com> wrote:
>>>> On Thu, 2007-07-12 at 14:07 +0200, Ingo Molnar wrote:
>>>>> * Gregory Haskins <ghaskins@...ell.com> wrote:
>>>>>> Hi Ingo, Thomas, and the greater linux-rt community,
>>>>>>
>>>>>> 	I just wanted to let you guys know that our team has a port of
>>>>>> the 21.5-rt20 patch for the 2.6.22 kernel available. [...]
>>>>> great! We had the upstream -rt port to .22 in the works too, it was just
>>>>> held up by the hpet breakage - which Thomas managed to fix earlier
>>>>> today. I've released the 2.6.22.1-rt1 patch to the usual place:
>>>>>
>>>>>     http://redhat.com/~mingo/realtime-preempt/
>>>> Thats awesome, Ingo!  Thanks!  Could you publish a broken out version
>>>> as well?  We found it extremely valuable to be able to bisect this
>>>> beast while working on the 21-22 port.
>>> we are working on something in this area :) Stay tuned ...
>> I've just been reviewing these patches and have spotted an error in the
>> file mm/slob.c at lines 500-501 whereby a non existent variable "c" is
>> referenced.  The attached patch is a proposed fix to the problem.
> 
> Could this explain why 2.6.22.1-rt1 seems to use a lot of swap?  I've been as 
> high as 570 megs into swap, currently at 286megs after doing a 
> swapoff --a;swapon -a about 8 hours ago.

No.  This problem would have caused the build to fail if slob was
configured.

Peter
-- 
Peter Williams                                   pwil3058@...pond.net.au

"Learning, n. The kind of ignorance distinguishing the studious."
 -- Ambrose Bierce
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