linux-kernel - Re: [PATCH 8/15] sched: Add parameter sched_mn_power_savings to control MN domain sched policy

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Date:	Thu, 27 Aug 2009 14:47:12 +0200
From:	Andreas Herrmann <andreas.herrmann3@....com>
To:	Gautham R Shenoy <ego@...ibm.com>
CC:	Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...e.hu>,
	linux-kernel@...r.kernel.org,
	Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com>,
	Balbir Singh <balbir@...ibm.com>
Subject: Re: [PATCH 8/15] sched: Add parameter sched_mn_power_savings to
	control MN domain sched policy

On Wed, Aug 26, 2009 at 03:00:43PM +0530, Gautham R Shenoy wrote:
> Hi Andreas,
> 
> On Thu, Aug 20, 2009 at 03:39:14PM +0200, Andreas Herrmann wrote:
> > @@ -9208,6 +9229,11 @@ int __init sched_create_sysfs_power_savings_entries(struct sysdev_class *cls)
> >  		err = sysfs_create_file(&cls->kset.kobj,
> >  					&attr_sched_mc_power_savings.attr);
> >  #endif
> > +#ifdef CONFIG_SCHED_MN
> > +	if (!err && mc_capable())
> > +		err = sysfs_create_file(&cls->kset.kobj,
> > +					&attr_sched_mn_power_savings.attr);
> > +#endif
> 
> This would create the sysfs tunable even on systems which are
> mc_capable() but don't have multi-nodes on a package, no ?

Yes, that is a bug. I should have introduced mn_capable() to
create this file only if really required.


Thanks,
Andreas

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