linux-kernel - Re: [PATCH] sched: Make nr_uninterruptible count a signed value

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Message-ID: <4FAB38ED.5050200@linux.vnet.ibm.com>
Date:	Thu, 10 May 2012 11:41:33 +0800
From:	Michael Wang <wangyun@...ux.vnet.ibm.com>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	Diwakar Tundlam <dtundlam@...dia.com>,
	"'Ingo Molnar'" <mingo@...nel.org>,
	"'David Rientjes'" <rientjes@...gle.com>,
	"'linux-kernel@...r.kernel.org'" <linux-kernel@...r.kernel.org>,
	Peter De Schrijver <pdeschrijver@...dia.com>
Subject: Re: [PATCH] sched: Make nr_uninterruptible count a signed value

On 05/09/2012 04:11 PM, Peter Zijlstra wrote:

> On Tue, 2012-05-08 at 15:46 -0700, Diwakar Tundlam wrote:
>> Maybe it is an artifact of 32-bit machine displaying 64-bit print format.
>> An (unsigned long)(-24) promoted to (signed long long) ends up as 4294967272.
>> As seen in my output of sched_debug.
> 
> Ah, quite possible. %Ld is indeed %lld and the value is long, not long
> long. So the proper fix is to fudge that printk statement somehow.


Could we use SEQ_printf for nr_uninterruptible, just like we did on
rq->load.weight?

Regards,
Michael Wang

> 
>> Your machine is probably natively 64-bit. 
> 
> Yeah, I gave up on 32bit computing a while ago..
> 
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