linux-kernel - Re: [TIP,BISECTED] Negative nice values have become big positive numbers

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Message-ID: <20090310001222.GA1843@silver.sucs.org>
Date:	Tue, 10 Mar 2009 00:12:22 +0000
From:	Sitsofe Wheeler <sitsofe@...oo.com>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Lai Jiangshan <laijs@...fujitsu.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org
Subject: Re: [TIP,BISECTED] Negative nice values have become big positive numbers

On Mon, Mar 09, 2009 at 09:15:04PM +0100, Frederic Weisbecker wrote:
> On Sun, Mar 08, 2009 at 11:18:50PM +0000, Sitsofe Wheeler wrote:
> > Formally negative nice values have started become very big in positive
> > integers in -tip kernels:
> > 
> >     2 root      15 2147483647     0    0    0 S  0.0  0.0   0:00.00 kthreadd    
> 
> The weird thing here is that number: 2147483647
> It is 0xefffffff
> Which means -1 without the highest bit (the sign).
> I really don't know how it could have happened.
> 
> Anyway, I caught something in the signedness bits from my patch that unifies
> the format decoding.
> I've never seen your bug on my machine. But I note you have a 32 bits CPU.
> Mine is 64 bits with a 64 bits kernel. Perhaps some weird signedness related things
> happened because of the signedness bug that the following patch fixes.
> 
> Can you please give it a try?

This seems to have fixed the problem (unless I'm mistaken):
    2 root      15  -5     0    0    0 S  0.0  0.0   0:00.00 kthreadd           

Thanks!

-- 
Sitsofe | http://sucs.org/~sits/
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