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From: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
To: Peter Zijlstra <a.p.zijlstra@chello.nl>
Subject: Re: [PATCH v3] cpuacct: VIRT_CPU_ACCOUNTING don't prevent percpu cputime count
Cc: kosaki.motohiro@jp.fujitsu.com, Ingo Molnar <mingo@elte.hu>,
       LKML <linux-kernel@vger.kernel.org>,
       Bharata B Rao <bharata@linux.vnet.ibm.com>,
       Balaji Rao <balajirrao@gmail.com>,
       Dhaval Giani <dhaval@linux.vnet.ibm.com>,
       KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
       Balbir Singh <balbir@linux.vnet.ibm.com>,
       Martin Schwidefsky <schwidefsky@de.ibm.com>
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Date: Sat,  9 May 2009 18:52:11 +0900 (JST)
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> On Sat, 2009-05-09 at 18:26 +0900, KOSAKI Motohiro wrote:
> > 
> > Index: b/kernel/sched.c
> > ===================================================================
> > --- a/kernel/sched.c    2009-05-09 16:48:08.000000000 +0900
> > +++ b/kernel/sched.c    2009-05-09 18:16:00.000000000 +0900
> > @@ -824,8 +824,12 @@ static struct file_operations sched_feat
> >         .release        = single_release,
> >  };
> >  
> > +static __read_mostly s32 cpuacct_batch;
> > +
> >  static __init int sched_init_debug(void)
> >  {
> > +       cpuacct_batch = jiffies_to_cputime(percpu_counter_batch);
> > +
> >         debugfs_create_file("sched_features", 0644, NULL, NULL,
> >                         &sched_feat_fops);
> 
> I'm pretty user you can select cpu accounting without SCHED_DEBUG...

Grr, yes, it's idiot ;)
I'll fix it soon.