linux-kernel - Re: [RFC][PATCH 14/26] sched, numa: Numa balancer

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Message-ID: <1341835552.3462.50.camel@twins>
Date:	Mon, 09 Jul 2012 14:05:52 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Rik van Riel <riel@...hat.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>, Paul Turner <pjt@...gle.com>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	Mike Galbraith <efault@....de>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Dan Smith <danms@...ibm.com>,
	Bharata B Rao <bharata.rao@...il.com>,
	Lee Schermerhorn <Lee.Schermerhorn@...com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [RFC][PATCH 14/26] sched, numa: Numa balancer

On Sat, 2012-07-07 at 14:26 -0400, Rik van Riel wrote:
> > +/*
> > + * Assumes symmetric NUMA -- that is, each node is of equal size.
> > + */
> > +static void set_max_mem_load(unsigned long load)
> > +{
> > +     unsigned long old_load;
> > +
> > +     spin_lock(&max_mem_load.lock);
> > +     old_load = max_mem_load.load;
> > +     if (!old_load)
> > +             old_load = load;
> > +     max_mem_load.load = (old_load + load) >> 1;
> > +     spin_unlock(&max_mem_load.lock);
> > +}
> 
> The above in your patch kind of conflicts with this bit
> from patch 6/26:

Yeah,.. its pretty broken. Its also effectively disabled, but yeah.


> Looking at how the memory load code is used, I wonder
> if it would make sense to count "zone size - free - inactive
> file" pages instead? 

Something like that, although I guess we'd want a sum over all zones in
a node for that.
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