linux-kernel - Re: [PATCH] sched/numa: Disable sched_numa

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Message-ID: <20150721100828.GA24741@linux.vnet.ibm.com>
Date:	Tue, 21 Jul 2015 15:38:28 +0530
From:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	linux-kernel@...r.kernel.org, Rik van Riel <riel@...hat.com>,
	Mel Gorman <mgorman@...e.de>
Subject: Re: [PATCH] sched/numa: Disable sched_numa_balancing on uma systems

> > @@ -2059,22 +2059,18 @@ static void __sched_fork(unsigned long clone_flags, struct task_struct *p)
> >  }
> >  
> >  #ifdef CONFIG_NUMA_BALANCING
> > -#ifdef CONFIG_SCHED_DEBUG
> > +__read_mostly bool sched_numa_balancing;
> > +
> >  void set_numabalancing_state(bool enabled)
> >  {
> > +	sched_numa_balancing = enabled;
> > +#ifdef CONFIG_SCHED_DEBUG
> >  	if (enabled)
> >  		sched_feat_set("NUMA");
> >  	else
> >  		sched_feat_set("NO_NUMA");
> 
> So why is the 'NUMA' sched_features option still twiddled? Your patch splits out a 
> sched_numa_balancing flag - so the NUMA/NO_NUMA feature can go away, right?
> 

I thought we could retain sched_feat so that we could enable/disable
sched numa balancing for debugging purposes similar to other sched
features if the kernel has been build with CONFIG_SCHED_DEBUG.

-- 
Thanks and Regards
Srikar Dronamraju

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