linux-kernel - Re: [PATCH -tip] cpuacct: per-cgroup utime/stime statistics

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Message-ID: <20090325044039.GB3276@in.ibm.com>
Date:	Wed, 25 Mar 2009 10:10:39 +0530
From:	Bharata B Rao <bharata@...ux.vnet.ibm.com>
To:	Li Zefan <lizf@...fujitsu.com>
Cc:	linux-kernel@...r.kernel.org, Balaji Rao <balajirrao@...il.com>,
	Dhaval Giani <dhaval@...ux.vnet.ibm.com>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Paul Menage <menage@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Subject: Re: [PATCH -tip] cpuacct: per-cgroup utime/stime statistics - v5

On Wed, Mar 25, 2009 at 08:48:03AM +0800, Li Zefan wrote:
> > cpuacct: Add stime and utime statistics
> > 
> > Add per-cgroup cpuacct controller statistics like the system and user
> > time consumed by the group of tasks.
> 
> Reviewed-by: Li Zefan <lizf@...fujitsu.com>

Thanks.

> 
> except a bug below.
> 
> > +	for (i = 0; i < CPUACCT_STAT_NSTATS; i++)
> > +		if (percpu_counter_init(&ca->cpustat[i], 0))
> > +			goto out_free_counters;
> >  
> >  	if (cgrp->parent)
> >  		ca->parent = cgroup_ca(cgrp->parent);
> >  
> >  	return &ca->css;
> > +
> > +out_free_counters:
> > +	i--;
> > +	while (i-- >= 0)
> > +		percpu_counter_destroy(&ca->cpustat[i]);
> 
> replace "i--; while (i-- >=0)" to "while (--i >=0)", otherwise
> you'll be accessing ca->cpustat[-1].

Sorry about this. Posted the fixed version.

Regards,
Bharata.
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