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

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Message-ID: <20090310100321.GA6825@nowhere>
Date:	Tue, 10 Mar 2009 11:03:25 +0100
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Sitsofe Wheeler <sitsofe@...oo.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 Tue, Mar 10, 2009 at 12:12:22AM +0000, Sitsofe Wheeler wrote:
> 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/


Thanks a lot Sitsofe!

Reported-and-tested-by: Sitsofe Wheeler <sitsofe@...oo.com>

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